Bump version for 1.0.0

Run interactive commands with the correct host

.github/workflows/ci.yml

@@ -1,5 +1,9 @@
 name: CI
-on: [push, pull_request]
+on: 
+  push:
+    branches:
+      - main
+  pull_request:
 jobs:
   tests:
     strategy:
@@ -8,12 +12,15 @@ jobs:
           - "2.7"
           - "3.1"
           - "3.2"
+        gemfile:
+          - Gemfile
+          - gemfiles/rails_edge.gemfile
         continue-on-error: [false]
-
     name: ${{ format('Tests (Ruby {0})', matrix.ruby-version) }}
     runs-on: ubuntu-latest
     continue-on-error: ${{ matrix.continue-on-error }}
-
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/${{ matrix.gemfile }}
     steps:
       - uses: actions/checkout@v2
 

.github/workflows/docker-publish.yml

@@ -0,0 +1,55 @@
+name: Docker
+
+on:
+  workflow_dispatch:
+    inputs:
+      tagInput:
+        description: 'Tag'
+        required: true
+    
+  release:
+    types: [created]
+    tags:
+      - 'v*'
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Determine version tag
+        id: version-tag
+        run: |
+          INPUT_VALUE="${{ github.event.inputs.tagInput }}"
+          if [ -z "$INPUT_VALUE" ]; then
+            INPUT_VALUE="${{ github.ref_name }}"
+          fi
+          echo "::set-output name=value::$INPUT_VALUE"
+      -
+        name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ghcr.io/basecamp/kamal:latest
+            ghcr.io/basecamp/kamal:${{ steps.version-tag.outputs.value }}

.gitignore

@@ -1,2 +1,5 @@
 .byebug_history
 *.gem
+coverage/*
+.DS_Store
+gemfiles/*.lock

CODE_OF_CONDUCT.md

@@ -0,0 +1,41 @@
+# Contributor Code of Conduct
+
+As contributors and maintainers of the Kamal project, we pledge to create a welcoming and inclusive environment for everyone. We value the participation of each member of our community and want all contributors to feel respected and valued.
+
+We are committed to providing a harassment-free experience for everyone, regardless of gender, gender identity and expression, sexual orientation, disability, physical appearance, body size, race, age, or religion (or lack thereof). We do not tolerate harassment of participants in any form.
+
+This code of conduct applies to all Kamal project spaces, including but not limited to project code, issue trackers, chat rooms, and mailing lists. Violations of this code of conduct may result in removal from the project community.
+
+## Our standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned with this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Reporting
+
+If you are subject to or witness unacceptable behavior, or have any other concerns, please notify a project maintainer. All reports will be kept confidential and will be reviewed and investigated promptly.
+
+We will investigate every complaint and take appropriate action. We reserve the right to remove any content that violates this Code of Conduct, or to temporarily or permanently ban any contributor for other behaviors that we deem inappropriate, threatening, offensive, or harmful.
+
+## Attribution
+
+This Code of Conduct is adapted from the Contributor Covenant, version 1.4, available at <https://www.contributor-covenant.org/version/1/4/code-of-conduct.html>.

CONTRIBUTING.md

@@ -0,0 +1,49 @@
+# Contributing to Kamal development
+
+Thank you for considering contributing to Kamal! This document outlines some guidelines for contributing to this open source project.
+
+Please make sure to review our [Code of Conduct](CODE_OF_CONDUCT.md) before contributing to Kamal.
+
+There are several ways you can contribute to the betterment of the project:
+
+- **Report an issue?** - If the issue isn’t reported, we can’t fix it. Please report any bugs, feature, and/or improvement requests on the [Kamal GitHub Issues tracker](https://github.com/basecamp/kamal/issues).
+- **Submit patches** - Do you have a new feature or a fix you'd like to share? [Submit a pull request](https://github.com/basecamp/kamal/pulls)!
+- **Write blog articles** - Are you using Kamal? We'd love to hear how you're using it with your projects. Write a tutorial and post it on your blog!
+
+## Issues
+
+If you encounter any issues with the project, please check the [existing issues](https://github.com/basecamp/kamal/issues) first to see if the issue has already been reported. If the issue hasn't been reported, please open a new issue with a clear description of the problem and steps to reproduce it.
+
+## Pull Requests
+
+Please keep the following guidelines in mind when opening a pull request:
+
+- Ensure that your code passes the project's minitests by running ./bin/test.
+- Provide a clear and detailed description of your changes.
+- Keep your changes focused on a single concern.
+- Write clean and readable code that follows the project's code style.
+- Use descriptive variable and function names.
+- Write clear and concise commit messages.
+- Add tests for your changes, if possible.
+- Ensure that your changes don't break existing functionality.
+
+#### Commit message guidelines
+
+A good commit message should describe what changed and why.
+
+## Development
+
+The `main` branch is regularly built and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of Kamal.
+
+Kamal is written in Ruby. You should have Ruby 3.2+ installed on your machine in order to work on Kamal. If that's already setup, run `bundle` in the root directory to install all dependencies. Then you can run `bin/test` to run all tests.
+
+1. Fork the project repository.
+2. Create a new branch for your contribution.
+3. Write your code or make the desired changes.
+4. **Ensure that your code passes the project's minitests by running ./bin/test.**
+5. Commit your changes and push them to your forked repository.
+6. [Open a pull request](https://github.com/basecamp/kamal/pulls) to the main project repository with a detailed description of your changes.
+
+## License
+
+Kamal is released under the MIT License. By contributing to this project, you agree to license your contributions under the same license.

Dockerfile

@@ -0,0 +1,40 @@
+# Use the official Ruby 3.2.0 Alpine image as the base image
+FROM ruby:3.2.0-alpine
+
+# Install  docker/buildx-bin
+COPY --from=docker/buildx-bin /buildx /usr/libexec/docker/cli-plugins/docker-buildx
+
+# Set the working directory to /kamal
+WORKDIR /kamal
+
+# Copy the Gemfile, Gemfile.lock into the container
+COPY Gemfile Gemfile.lock kamal.gemspec ./
+
+# Required in kamal.gemspec
+COPY lib/kamal/version.rb /kamal/lib/kamal/version.rb
+
+# Install system dependencies
+RUN apk add --no-cache --update build-base git docker openrc openssh-client-default \
+    && rc-update add docker boot \
+    && gem install bundler --version=2.4.3 \
+    && bundle install
+
+# Copy the rest of our application code into the container.
+# We do this after bundle install, to avoid having to run bundle
+# every time we do small fixes in the source code.
+COPY . .
+
+# Install the gem locally from the project folder
+RUN gem build kamal.gemspec && \
+    gem install ./kamal-*.gem --no-document
+
+# Set the working directory to /workdir
+WORKDIR /workdir
+
+# Tell git it's safe to access /workdir/.git even if
+# the directory is owned by a different user
+RUN git config --global --add safe.directory /workdir
+
+# Set the entrypoint to run the installed binary in /workdir
+# Example:  docker run -it -v "$PWD:/workdir" kamal init
+ENTRYPOINT ["kamal"]

Gemfile

@@ -2,6 +2,3 @@ source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 gemspec
-
-gem "debug"
-gem "railties"

Gemfile.lock

@@ -1,98 +1,106 @@
 PATH
   remote: .
   specs:
-    mrsk (0.4.0)
+    kamal (1.0.0)
       activesupport (>= 7.0)
+      bcrypt_pbkdf (~> 1.0)
+      concurrent-ruby (~> 1.2)
       dotenv (~> 2.8)
+      ed25519 (~> 1.2)
+      net-ssh (~> 7.0)
       sshkit (~> 1.21)
       thor (~> 1.2)
+      zeitwerk (~> 2.5)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actionpack (7.0.4)
+    actionpack (7.0.4.3)
-      actionview (= 7.0.4)
+      actionview (= 7.0.4.3)
-      activesupport (= 7.0.4)
+      activesupport (= 7.0.4.3)
       rack (~> 2.0, >= 2.2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.2.0)
-    actionview (7.0.4)
+    actionview (7.0.4.3)
-      activesupport (= 7.0.4)
+      activesupport (= 7.0.4.3)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.1, >= 1.2.0)
-    activesupport (7.0.4)
+    activesupport (7.0.4.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
+    bcrypt_pbkdf (1.1.0)
     builder (3.2.4)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     crass (1.0.6)
-    debug (1.7.1)
+    debug (1.7.2)
       irb (>= 1.5.0)
       reline (>= 0.3.1)
     dotenv (2.8.1)
+    ed25519 (1.3.0)
     erubi (1.12.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     io-console (0.6.0)
-    irb (1.6.2)
+    irb (1.6.3)
       reline (>= 0.3.0)
-    loofah (2.19.1)
+    loofah (2.20.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     method_source (1.0.0)
-    minitest (5.17.0)
+    minitest (5.18.0)
+    mocha (2.0.2)
+      ruby2_keywords (>= 0.0.5)
     net-scp (4.0.0)
       net-ssh (>= 2.6.5, < 8.0.0)
-    net-ssh (7.0.1)
+    net-ssh (7.1.0)
-    nokogiri (1.14.0-arm64-darwin)
+    nokogiri (1.14.2-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.0-x86_64-darwin)
+    nokogiri (1.14.2-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.0-x86_64-linux)
+    nokogiri (1.14.2-x86_64-linux)
       racc (~> 1.4)
     racc (1.6.2)
-    rack (2.2.5)
+    rack (2.2.6.4)
-    rack-test (2.0.2)
+    rack-test (2.1.0)
       rack (>= 1.3)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.4)
+    rails-html-sanitizer (1.5.0)
       loofah (~> 2.19, >= 2.19.1)
-    railties (7.0.4)
+    railties (7.0.4.3)
-      actionpack (= 7.0.4)
+      actionpack (= 7.0.4.3)
-      activesupport (= 7.0.4)
+      activesupport (= 7.0.4.3)
       method_source
       rake (>= 12.2)
       thor (~> 1.0)
       zeitwerk (~> 2.5)
     rake (13.0.6)
-    reline (0.3.2)
+    reline (0.3.3)
       io-console (~> 0.5)
-    sshkit (1.21.3)
+    ruby2_keywords (0.0.5)
+    sshkit (1.21.4)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
     thor (1.2.1)
-    tzinfo (2.0.5)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    zeitwerk (2.6.6)
+    zeitwerk (2.6.7)
 
 PLATFORMS
-  arm64-darwin-20
+  arm64-darwin
-  arm64-darwin-21
+  x86_64-darwin
-  arm64-darwin-22
-  x86_64-darwin-20
-  x86_64-darwin-21
   x86_64-linux
 
 DEPENDENCIES
   debug
-  mrsk!
+  kamal!
+  mocha
   railties
 
 BUNDLED WITH

README.md

@@ -1,412 +1,13 @@
-# MRSK
+# Kamal: Deploy web apps anywhere
 
-MRSK deploys Rails apps in containers to servers running Docker with zero downtime. It uses the dynamic reverse-proxy Traefik to hold requests while the new application container is started and the old one is stopped. It works seamlessly across multiple hosts, using SSHKit to execute commands.
+From bare metal to cloud VMs, deploy web apps anywhere with zero downtime. Kamal has the dynamic reverse-proxy Traefik hold requests while a new app container is started and the old one is stopped. Works seamlessly across multiple hosts, using SSHKit to execute commands. Originally built for Rails apps, Kamal will work with any type of web app that can be containerized with Docker.
 
-## Installation
+➡️ See [kamal-deploy.org](https://kamal-deploy.org) for documentation on [installation](https://kamal-deploy.org/docs/installation), [configuration](https://kamal-deploy.org/docs/configuration), and [commands](https://kamal-deploy.org/docs/commands).
 
-Install MRSK globally with `gem install mrsk`. Then, inside your app directory, run `mrsk install`. Now edit the new file `config/deploy.yml`. It could look as simple as this:
+## Contributing to the documentation
 
-```yaml
+Please help us improve Kamal's documentation on the [the basecamp/kamal-site repository](https://github.com/basecamp/kamal-site).
-service: hey
-image: 37s/hey
-servers:
-  - 192.168.0.1
-  - 192.168.0.2
-registry:
-  username: registry-user-name
-  password: <%= ENV.fetch("MRSK_REGISTRY_PASSWORD") %>
-```
-
-Now you're ready to deploy a multi-arch image to the servers:
-
-```
-MRSK_REGISTRY_PASSWORD=pw mrsk deploy
-```
-
-This will:
-
-1. Connect to the servers over SSH (using root by default, authenticated by your loaded ssh key)
-2. Install Docker on any server that might be missing it (using apt-get)
-3. Log into the registry both locally and remotely
-4. Build the image using the standard Dockerfile in the root of the application.
-5. Push the image to the registry.
-6. Pull the image from the registry on the servers.
-7. Ensure Traefik is running and accepting traffic on port 80.
-8. Stop any containers running a previous versions of the app.
-9. Start a new container with the version of the app that matches the current git version hash.
-10. Prune unused images and stopped containers to ensure servers don't fill up.
-
-Voila! All the servers are now serving the app on port 80. If you're just running a single server, you're ready to go. If you're running multiple servers, you need to put a load balancer in front of them.
-
-## Why not just run Capistrano or Kubernetes?
-
-MRSK basically is Capistrano for Containers, which allow us to use vanilla servers as the hosts. No need to ensure that the servers have just the right version of Ruby or other dependencies you need. That all lives in the Docker image now. You can boot a brand new Ubuntu (or whatever) server, add it to the deploy servers of MRSK, and it'll be auto-provisioned with Docker, and run right away. Docker's layer caching also allows for quicker deployments with less mucking about on the server. And the images built for MRSK can be used for CI or later introspection.
-
-Kubernetes is a beast. Running it yourself on your own hardware is not for the faint of heart. It's a fine option if you want to run on someone else's platform, like Render or Fly, but if you'd like the freedom to move between cloud and your own hardware, or even mix the two, MRSK is much simpler. You can see everything that's going on, it's just basic Docker commands being called.
-
-## Configuration
-
-### Using .env file to load required environment variables
-
-MRSK uses [dotenv](https://github.com/bkeepers/dotenv) to automatically load environment variables set in the `.env` file present in the application root. This file can be used to set variables like `MRSK_REGISTRY_PASSWORD` or database passwords. But for this reason you must ensure that .env files are not checked into Git or included in your Dockerfile! The format is just key-value like:
-
-```bash
-MRSK_REGISTRY_PASSWORD=pw
-DB_PASSWORD=secret123
-```
-
-### Using another registry than Docker Hub
-
-The default registry is Docker Hub, but you can change it using `registry/server`:
-
-```yaml
-registry:
-  server: registry.digitalocean.com
-  username: registry-user-name
-  password: <%= ENV.fetch("MRSK_REGISTRY_PASSWORD") %>
-```
-
-### Using a different SSH user than root
-
-The default SSH user is root, but you can change it using `ssh_user`:
-
-```yaml
-ssh_user: app
-```
-
-### Using env variables
-
-You can inject env variables into the app containers using `env`:
-
-```yaml
-env:
-  DATABASE_URL: mysql2://db1/hey_production/
-  REDIS_URL: redis://redis1:6379/1
-```
-
-### Using secret env variables
-
-If you have env variables that are secret, you can divide the `env` block into `clear` and `secret`:
-
-```yaml
-env:
-  clear:
-    DATABASE_URL: mysql2://db1/hey_production/
-    REDIS_URL: redis://redis1:6379/1
-  secret:
-    - DATABASE_PASSWORD
-    - REDIS_PASSWORD
-```
-
-The list of secret env variables will be expanded at run time from your local machine. So a reference to a secret `DATABASE_PASSWORD` will look for `ENV["DATABASE_PASSWORD"]` on the machine running MRSK. Just like with build secrets.
-
-If the referenced secret ENVs are missing, the configuration will be halted with a `KeyError` exception.
-
-Note: Marking an ENV as secret currently only redacts its value in the output for MRSK. The ENV is still injected in the clear into the container at runtime.
-
-### Using volumes
-
-You can add custom volumes into the app containers using `volumes`:
-
-```yaml
-volumes:
-  - "/local/path:/container/path"
-```
-
-### Using different roles for servers
-
-If your application uses separate hosts for running jobs or other roles beyond the default web running, you can specify these hosts in a dedicated role with a new entrypoint command like so:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  job:
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-    cmd: bin/jobs
-```
-
-Note: Traefik will only by default be installed and run on the servers in the `web` role (and on all servers if no roles are defined). If you need Traefik on hosts in other roles than `web`, add `traefik: true`:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  web2:
-    traefik: true
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-```
-
-### Using container labels
-
-You can specialize the default Traefik rules by setting labels on the containers that are being started:
-
-```
-labels:
-  traefik.http.routers.hey.rule: '''Host(`app.hey.com`)'''
-```
-
-Note: The extra quotes are needed to ensure the rule is passed in correctly!
-
-This allows you to run multiple applications on the same server sharing the same Traefik instance and port.
-See https://doc.traefik.io/traefik/routing/routers/#rule for a full list of available routing rules.
-
-The labels can also be applied on a per-role basis:
-
-```yaml
-servers:
-  web:
-    - 192.168.0.1
-    - 192.168.0.2
-  job:
-    hosts:
-      - 192.168.0.3
-      - 192.168.0.4
-    cmd: bin/jobs
-    labels:
-      my-label: "50"
-```
-
-### Using remote builder for native multi-arch
-
-If you're developing on ARM64 (like Apple Silicon), but you want to deploy on AMD64 (x86 64-bit), you can use multi-archecture images. By default, MRSK will setup a local buildx configuration that does this through QEMU emulation. But this can be quite slow, especially on the first build.
-
-If you want to speed up this process by using a remote AMD64 host to natively build the AMD64 part of the image, while natively building the ARM64 part locally, you can do so using builder options:
-
-```yaml
-builder:
-  local:
-    arch: arm64
-    host: unix:///Users/<%= `whoami`.strip %>/.docker/run/docker.sock
-  remote:
-    arch: amd64
-    host: ssh://root@192.168.0.1
-```
-
-Note: You must have Docker running on the remote host being used as a builder. This instance should only be shared for builds using the same registry and credentials.
-
-### Using remote builder for single-arch
-
-If you're developing on ARM64 (like Apple Silicon), want to deploy on AMD64 (x86 64-bit), but don't need to run the image locally (or on other ARM64 hosts), you can configure a remote builder that just targets AMD64. This is a bit faster than building with multi-arch, as there's nothing to build locally.
-
-```yaml
-builder:
-  remote:
-    arch: amd64
-    host: ssh://root@192.168.0.1
-```
-
-### Using native builder when multi-arch isn't needed
-
-If you're developing on the same architecture as the one you're deploying on, you can speed up the build by forgoing both multi-arch and remote building:
-
-```yaml
-builder:
-  multiarch: false
-```
-
-This is also a good option if you're running MRSK from a CI server that shares architecture with the deployment servers.
-
-### Using build secrets for new images
-
-Some images need a secret passed in during build time, like a GITHUB_TOKEN to give access to private gem repositories. This can be done by having the secret in ENV, then referencing it in the builder configuration:
-
-```yaml
-builder:
-  secrets:
-    - GITHUB_TOKEN
-```
-
-This build secret can then be referenced in the Dockerfile:
-
-```
-# Copy Gemfiles
-COPY Gemfile Gemfile.lock ./
-
-# Install dependencies, including private repositories via access token
-RUN --mount=type=secret,id=GITHUB_TOKEN \
-  BUNDLE_GITHUB__COM=x-access-token:$(cat /run/secrets/GITHUB_TOKEN) \
-  bundle install
-```
-
-### Using command arguments for Traefik
-
-You can customize the traefik command line:
-
-```yaml
-traefik:
-  accesslog: true
-  accesslog.format: json
-  metrics.prometheus: true
-  metrics.prometheus.buckets: 0.1,0.3,1.2,5.0
-```
-
-### Configuring build args for new images
-
-Build arguments that aren't secret can also be configured:
-
-```yaml
-builder:
-  args:
-    RUBY_VERSION: 3.2.0
-```
-
-This build argument can then be used in the Dockerfile:
-
-```
-# Private repositories need an access token during the build
-ARG RUBY_VERSION
-FROM ruby:$RUBY_VERSION-slim as base
-```
-
-### Using without RAILS_MASTER_KEY
-
-If you're using MRSK with older Rails apps that predate RAILS_MASTER_KEY, or with a non-Rails app, you can skip the default usage and reference:
-
-```yaml
-skip_master_key: true
-```
-
-### Using accessories for database, cache, search services
-
-You can manage your accessory services via MRSK as well. The services will build off public images, and will not be automatically updated when you deploy:
-
-```yaml
-accessories:
-  mysql:
-    image: mysql:5.7
-    host: 1.1.1.3
-    port: 3306
-    env:
-      clear:
-        MYSQL_ROOT_HOST: '%'
-      secret:
-        - MYSQL_ROOT_PASSWORD
-    volumes:
-      - /var/lib/mysql:/var/lib/mysql
-  redis:
-    image: redis:latest
-    host: 1.1.1.4
-    port: "36379:6379"
-    volumes:
-      - /var/lib/redis:/data
-```
-
-Now run `mrsk accessory start mysql` to start the MySQL server on 1.1.1.3. See `mrsk accessory` for all the commands possible.
-
-## Commands
-
-### Running remote execution and runners
-
-If you need to execute commands inside the Rails containers, you can use `mrsk app exec` and `mrsk app runner`. Examples:
-
-```bash
-# Runs command on all servers
-mrsk app exec 'ruby -v'
-App Host: 192.168.0.1
-ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-
-App Host: 192.168.0.2
-ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-
-# Runs command on primary server
-mrsk app exec --primary 'cat .ruby-version'
-App Host: 192.168.0.1
-3.1.3
-
-# Runs Rails command on all servers
-mrsk app exec 'bin/rails about'
-App Host: 192.168.0.1
-About your application's environment
-Rails version             7.1.0.alpha
-Ruby version              ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-RubyGems version          3.3.26
-Rack version              2.2.5
-Middleware                ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::Callbacks, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, ActionDispatch::PermissionsPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper
-Application root          /rails
-Environment               production
-Database adapter          sqlite3
-Database schema version   20221231233303
-
-App Host: 192.168.0.2
-About your application's environment
-Rails version             7.1.0.alpha
-Ruby version              ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
-RubyGems version          3.3.26
-Rack version              2.2.5
-Middleware                ActionDispatch::HostAuthorization, Rack::Sendfile, ActionDispatch::Static, ActionDispatch::Executor, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, ActionDispatch::RemoteIp, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::Callbacks, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ContentSecurityPolicy::Middleware, ActionDispatch::PermissionsPolicy::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Rack::TempfileReaper
-Application root          /rails
-Environment               production
-Database adapter          sqlite3
-Database schema version   20221231233303
-
-# Run Rails runner on primary server
-mrsk app runner -p 'puts Rails.application.config.time_zone'
-UTC
-```
-
-### Running a Rails console
-
-If you need to interact with the production console for the app, you can use `mrsk app console`, which will start a Rails console session on the primary host. You can start the console on a different host using `mrsk app console --host 192.168.0.2`. Be mindful that this is a live wire! Any changes made to the production database will take effect immeditately.
-
-### Running details to see state of containers
-
-You can see the state of your servers by running `mrsk details`:
-
-```
-Traefik Host: 192.168.0.1
-CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES
-6195b2a28c81   traefik   "/entrypoint.sh --pr…"   30 minutes ago   Up 19 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   traefik
-
-Traefik Host: 192.168.0.2
-CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                               NAMES
-de14a335d152   traefik   "/entrypoint.sh --pr…"   30 minutes ago   Up 19 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   traefik
-
-App Host: 192.168.0.1
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS          PORTS      NAMES
-badb1aa51db3   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   13 minutes ago   Up 13 minutes   3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-
-App Host: 192.168.0.2
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS          PORTS      NAMES
-1d3c91ed1f55   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   13 minutes ago   Up 13 minutes   3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-```
-
-You can also see just info for app containers with `mrsk app details` or just for Traefik with `mrsk traefik details`.
-
-### Running rollback to fix a bad deploy
-
-If you've discovered a bad deploy, you can quickly rollback by reactivating the old, paused container image. You can see what old containers are available for rollback by running `mrsk app containers`. It'll give you a presentation similar to `mrsk app details`, but include all the old containers as well. Showing something like this:
-
-```
-App Host: 192.168.0.1
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS                      PORTS      NAMES
-1d3c91ed1f51   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   19 minutes ago   Up 19 minutes               3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-539f26b28369   registry.digitalocean.com/user/app:e5d9d7c2b898289dfbc5f7f1334140d984eedae4   "/rails/bin/docker-e…"   31 minutes ago   Exited (1) 27 minutes ago              chat-e5d9d7c2b898289dfbc5f7f1334140d984eedae4
-
-App Host: 192.168.0.2
-CONTAINER ID   IMAGE                                                                         COMMAND                  CREATED          STATUS                      PORTS      NAMES
-badb1aa51db4   registry.digitalocean.com/user/app:6ef8a6a84c525b123c5245345a8483f86d05a123   "/rails/bin/docker-e…"   19 minutes ago   Up 19 minutes               3000/tcp   chat-6ef8a6a84c525b123c5245345a8483f86d05a123
-6f170d1172ae   registry.digitalocean.com/user/app:e5d9d7c2b898289dfbc5f7f1334140d984eedae4   "/rails/bin/docker-e…"   31 minutes ago   Exited (1) 27 minutes ago              chat-e5d9d7c2b898289dfbc5f7f1334140d984eedae4
-```
-
-From the example above, we can see that `e5d9d7c2b898289dfbc5f7f1334140d984eedae4` was the last version, so it's available as a rollback target. We can perform this rollback by running `mrsk rollback e5d9d7c2b898289dfbc5f7f1334140d984eedae4`. That'll stop `6ef8a6a84c525b123c5245345a8483f86d05a123` and then start `e5d9d7c2b898289dfbc5f7f1334140d984eedae4`. Because the old container is still available, this is very quick. Nothing to download from the registry.
-
-Note that by default old containers are pruned after 3 days when you run `mrsk deploy`.
-
-### Running removal to clean up servers
-
-If you wish to remove the entire application, including Traefik, containers, images, and registry session, you can run `mrsk remove`. This will leave the servers clean.
-
-## Stage of development
-
-This is alpha software. Lots of stuff is missing. Lots of stuff will keep moving around for a while.
 
 ## License
 
-MRSK is released under the [MIT License](https://opensource.org/licenses/MIT).
+Kamal is released under the [MIT License](https://opensource.org/licenses/MIT).

bin/kamal

@@ -3,15 +3,16 @@
 # Prevent failures from being reported twice.
 Thread.report_on_exception = false
 
-require "dotenv/load"
+require "kamal"
-require "mrsk/cli"
 
 begin
-  Mrsk::Cli::Main.start(ARGV)
+  Kamal::Cli::Main.start(ARGV)
 rescue SSHKit::Runner::ExecuteError => e
-  puts "  \e[31mERROR (#{e.cause.class}): #{e.cause.message}\e[0m"
+  puts "  \e[31mERROR (#{e.cause.class}): #{e.message}\e[0m"
   puts e.cause.backtrace if ENV["VERBOSE"]
+  exit 1
 rescue => e
   puts "  \e[31mERROR (#{e.class}): #{e.message}\e[0m"
   puts e.backtrace if ENV["VERBOSE"]
+  exit 1
 end

bin/release

@@ -2,13 +2,13 @@
 
 VERSION=$1
 
-printf "module Mrsk\n  VERSION = \"$VERSION\"\nend\n" > ./lib/mrsk/version.rb
+printf "module Kamal\n  VERSION = \"$VERSION\"\nend\n" > ./lib/kamal/version.rb
 bundle
-git add Gemfile.lock lib/mrsk/version.rb
+git add Gemfile.lock lib/kamal/version.rb
 git commit -m "Bump version for $VERSION"
 git push
 git tag v$VERSION
 git push --tags
-gem build mrsk.gemspec
+gem build kamal.gemspec
-gem push "mrsk-$VERSION.gem" --host https://rubygems.org
+gem push "kamal-$VERSION.gem" --host https://rubygems.org
-rm "mrsk-$VERSION.gem"
+rm "kamal-$VERSION.gem"

gemfiles/rails_edge.gemfile

@@ -0,0 +1,9 @@
+source 'https://rubygems.org'
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+git "https://github.com/rails/rails.git" do
+  gem "railties"
+  gem "activesupport"
+end
+
+gemspec path: "../"

kamal.gemspec

@@ -0,0 +1,27 @@
+require_relative "lib/kamal/version"
+
+Gem::Specification.new do |spec|
+  spec.name        = "kamal"
+  spec.version     = Kamal::VERSION
+  spec.authors     = [ "David Heinemeier Hansson" ]
+  spec.email       = "dhh@hey.com"
+  spec.homepage    = "https://github.com/basecamp/kamal"
+  spec.summary     = "Deploy web apps in containers to servers running Docker with zero downtime."
+  spec.license     = "MIT"
+  spec.files = Dir["lib/**/*", "MIT-LICENSE", "README.md"]
+  spec.executables = %w[ kamal ]
+
+  spec.add_dependency "activesupport", ">= 7.0"
+  spec.add_dependency "sshkit", "~> 1.21"
+  spec.add_dependency "net-ssh", "~> 7.0"
+  spec.add_dependency "thor", "~> 1.2"
+  spec.add_dependency "dotenv", "~> 2.8"
+  spec.add_dependency "zeitwerk", "~> 2.5"
+  spec.add_dependency "ed25519", "~> 1.2"
+  spec.add_dependency "bcrypt_pbkdf", "~> 1.0"
+  spec.add_dependency "concurrent-ruby", "~> 1.2"
+
+  spec.add_development_dependency "debug"
+  spec.add_development_dependency "mocha"
+  spec.add_development_dependency "railties"
+end

lib/kamal.rb

@@ -0,0 +1,10 @@
+module Kamal
+end
+
+require "active_support"
+require "zeitwerk"
+
+loader = Zeitwerk::Loader.for_gem
+loader.ignore("#{__dir__}/kamal/sshkit_with_ext.rb")
+loader.setup
+loader.eager_load # We need all commands loaded.

lib/kamal/cli.rb

@@ -0,0 +1,7 @@
+module Kamal::Cli
+  class LockError < StandardError; end
+  class HookError < StandardError; end
+end
+
+# SSHKit uses instance eval, so we need a global const for ergonomics
+KAMAL = Kamal::Commander.new

lib/kamal/cli/accessory.rb

@@ -0,0 +1,239 @@
+class Kamal::Cli::Accessory < Kamal::Cli::Base
+  desc "boot [NAME]", "Boot new accessory service on host (use NAME=all to boot all accessories)"
+  def boot(name, login: true)
+    mutating do
+      if name == "all"
+        KAMAL.accessory_names.each { |accessory_name| boot(accessory_name) }
+      else
+        with_accessory(name) do |accessory|
+          directories(name)
+          upload(name)
+
+          on(accessory.hosts) do
+            execute *KAMAL.registry.login if login
+            execute *KAMAL.auditor.record("Booted #{name} accessory"), verbosity: :debug
+            execute *accessory.run
+          end
+        end
+      end
+    end
+  end
+
+  desc "upload [NAME]", "Upload accessory files to host", hide: true
+  def upload(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          accessory.files.each do |(local, remote)|
+            accessory.ensure_local_file_present(local)
+
+            execute *accessory.make_directory_for(remote)
+            upload! local, remote
+            execute :chmod, "755", remote
+          end
+        end
+      end
+    end
+  end
+
+  desc "directories [NAME]", "Create accessory directories on host", hide: true
+  def directories(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          accessory.directories.keys.each do |host_path|
+            execute *accessory.make_directory(host_path)
+          end
+        end
+      end
+    end
+  end
+
+  desc "reboot [NAME]", "Reboot existing accessory on host (stop container, remove container, start new container)"
+  def reboot(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *KAMAL.registry.login
+        end
+
+        stop(name)
+        remove_container(name)
+        boot(name, login: false)
+      end
+    end
+  end
+
+  desc "start [NAME]", "Start existing accessory container on host"
+  def start(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Started #{name} accessory"), verbosity: :debug
+          execute *accessory.start
+        end
+      end
+    end
+  end
+
+  desc "stop [NAME]", "Stop existing accessory container on host"
+  def stop(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Stopped #{name} accessory"), verbosity: :debug
+          execute *accessory.stop, raise_on_non_zero_exit: false
+        end
+      end
+    end
+  end
+
+  desc "restart [NAME]", "Restart existing accessory container on host"
+  def restart(name)
+    mutating do
+      with_accessory(name) do
+        stop(name)
+        start(name)
+      end
+    end
+  end
+
+  desc "details [NAME]", "Show details about accessory on host (use NAME=all to show all accessories)"
+  def details(name)
+    if name == "all"
+      KAMAL.accessory_names.each { |accessory_name| details(accessory_name) }
+    else
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) { puts capture_with_info(*accessory.info) }
+      end
+    end
+  end
+
+  desc "exec [NAME] [CMD]", "Execute a custom command on servers (use --help to show options)"
+  option :interactive, aliases: "-i", type: :boolean, default: false, desc: "Execute command over ssh for an interactive shell (use for console/bash)"
+  option :reuse, type: :boolean, default: false, desc: "Reuse currently running container instead of starting a new one"
+  def exec(name, cmd)
+    with_accessory(name) do |accessory|
+      case
+      when options[:interactive] && options[:reuse]
+        say "Launching interactive command with via SSH from existing container...", :magenta
+        run_locally { exec accessory.execute_in_existing_container_over_ssh(cmd) }
+
+      when options[:interactive]
+        say "Launching interactive command via SSH from new container...", :magenta
+        run_locally { exec accessory.execute_in_new_container_over_ssh(cmd) }
+
+      when options[:reuse]
+        say "Launching command from existing container...", :magenta
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
+          capture_with_info(*accessory.execute_in_existing_container(cmd))
+        end
+
+      else
+        say "Launching command from new container...", :magenta
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on #{name} accessory"), verbosity: :debug
+          capture_with_info(*accessory.execute_in_new_container(cmd))
+        end
+      end
+    end
+  end
+
+  desc "logs [NAME]", "Show log lines from accessory on host (use --help to show options)"
+  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
+  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
+  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
+  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
+  def logs(name)
+    with_accessory(name) do |accessory|
+      grep = options[:grep]
+
+      if options[:follow]
+        run_locally do
+          info "Following logs on #{accessory.hosts}..."
+          info accessory.follow_logs(grep: grep)
+          exec accessory.follow_logs(grep: grep)
+        end
+      else
+        since = options[:since]
+        lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
+
+        on(accessory.hosts) do
+          puts capture_with_info(*accessory.logs(since: since, lines: lines, grep: grep))
+        end
+      end
+    end
+  end
+
+  desc "remove [NAME]", "Remove accessory container, image and data directory from host (use NAME=all to remove all accessories)"
+  option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
+  def remove(name)
+    mutating do
+      if name == "all"
+        KAMAL.accessory_names.each { |accessory_name| remove(accessory_name) }
+      else
+        if options[:confirmed] || ask("This will remove all containers, images and data directories for #{name}. Are you sure?", limited_to: %w( y N ), default: "N") == "y"
+          with_accessory(name) do
+            stop(name)
+            remove_container(name)
+            remove_image(name)
+            remove_service_directory(name)
+          end
+        end
+      end
+    end
+  end
+
+  desc "remove_container [NAME]", "Remove accessory container from host", hide: true
+  def remove_container(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Remove #{name} accessory container"), verbosity: :debug
+          execute *accessory.remove_container
+        end
+      end
+    end
+  end
+
+  desc "remove_image [NAME]", "Remove accessory image from host", hide: true
+  def remove_image(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *KAMAL.auditor.record("Removed #{name} accessory image"), verbosity: :debug
+          execute *accessory.remove_image
+        end
+      end
+    end
+  end
+
+  desc "remove_service_directory [NAME]", "Remove accessory directory used for uploaded files and data directories from host", hide: true
+  def remove_service_directory(name)
+    mutating do
+      with_accessory(name) do |accessory|
+        on(accessory.hosts) do
+          execute *accessory.remove_service_directory
+        end
+      end
+    end
+  end
+
+  private
+    def with_accessory(name)
+      if accessory = KAMAL.accessory(name)
+        yield accessory
+      else
+        error_on_missing_accessory(name)
+      end
+    end
+
+    def error_on_missing_accessory(name)
+      options = KAMAL.accessory_names.presence
+
+      error \
+        "No accessory by the name of '#{name}'" +
+        (options ? " (options: #{options.to_sentence})" : "")
+    end
+end

lib/kamal/cli/app.rb

@@ -0,0 +1,323 @@
+class Kamal::Cli::App < Kamal::Cli::Base
+  desc "boot", "Boot app on servers (or reboot app if already running)"
+  def boot
+    mutating do
+      hold_lock_on_error do
+        say "Get most recent version available as an image...", :magenta unless options[:version]
+        using_version(version_or_latest) do |version|
+          say "Start container with version #{version} using a #{KAMAL.config.readiness_delay}s readiness delay (or reboot if already running)...", :magenta
+
+          on(KAMAL.hosts) do
+            execute *KAMAL.auditor.record("Tagging #{KAMAL.config.absolute_image} as the latest image"), verbosity: :debug
+            execute *KAMAL.app.tag_current_image_as_latest
+
+            KAMAL.roles_on(host).each do |role|
+              app = KAMAL.app(role: role)
+              role_config = KAMAL.config.role(role)
+
+              if role_config.assets?
+                execute *app.extract_assets
+                old_version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
+                execute *app.sync_asset_volumes(old_version: old_version)
+              end
+            end
+          end
+
+          on(KAMAL.hosts, **KAMAL.boot_strategy) do |host|
+            KAMAL.roles_on(host).each do |role|
+              app = KAMAL.app(role: role)
+              auditor = KAMAL.auditor(role: role)
+              role_config = KAMAL.config.role(role)
+
+              if capture_with_info(*app.container_id_for_version(version), raise_on_non_zero_exit: false).present?
+                tmp_version = "#{version}_replaced_#{SecureRandom.hex(8)}"
+                info "Renaming container #{version} to #{tmp_version} as already deployed on #{host}"
+                execute *auditor.record("Renaming container #{version} to #{tmp_version}"), verbosity: :debug
+                execute *app.rename_container(version: version, new_version: tmp_version)
+              end
+
+              old_version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
+
+              execute *app.tie_cord(role_config.cord_host_file) if role_config.uses_cord?
+
+              execute *auditor.record("Booted app version #{version}"), verbosity: :debug
+
+              execute *app.run(hostname: "#{host}-#{SecureRandom.hex(6)}")
+
+              Kamal::Cli::Healthcheck::Poller.wait_for_healthy(pause_after_ready: true) { capture_with_info(*app.status(version: version)) }
+
+              if old_version.present?
+                if role_config.uses_cord?
+                  cord = capture_with_info(*app.cord(version: old_version), raise_on_non_zero_exit: false).strip
+                  if cord.present?
+                    execute *app.cut_cord(cord)
+                    Kamal::Cli::Healthcheck::Poller.wait_for_unhealthy(pause_after_ready: true) { capture_with_info(*app.status(version: old_version)) }
+                  end
+                end
+
+                execute *app.stop(version: old_version), raise_on_non_zero_exit: false
+
+                execute *app.clean_up_assets if role_config.assets?
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
+  desc "start", "Start existing app container on servers"
+  def start
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Started app version #{KAMAL.config.version}"), verbosity: :debug
+          execute *KAMAL.app(role: role).start, raise_on_non_zero_exit: false
+        end
+      end
+    end
+  end
+
+  desc "stop", "Stop app container on servers"
+  def stop
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Stopped app", role: role), verbosity: :debug
+          execute *KAMAL.app(role: role).stop, raise_on_non_zero_exit: false
+        end
+      end
+    end
+  end
+
+  # FIXME: Drop in favor of just containers?
+  desc "details", "Show details about app containers"
+  def details
+    on(KAMAL.hosts) do |host|
+      roles = KAMAL.roles_on(host)
+
+      roles.each do |role|
+        puts_by_host host, capture_with_info(*KAMAL.app(role: role).info)
+      end
+    end
+  end
+
+  desc "exec [CMD]", "Execute a custom command on servers (use --help to show options)"
+  option :interactive, aliases: "-i", type: :boolean, default: false, desc: "Execute command over ssh for an interactive shell (use for console/bash)"
+  option :reuse, type: :boolean, default: false, desc: "Reuse currently running container instead of starting a new one"
+  def exec(cmd)
+    case
+    when options[:interactive] && options[:reuse]
+      say "Get current version of running container...", :magenta unless options[:version]
+      using_version(options[:version] || current_running_version) do |version|
+        say "Launching interactive command with version #{version} via SSH from existing container on #{KAMAL.primary_host}...", :magenta
+        run_locally { exec KAMAL.app(role: KAMAL.primary_role).execute_in_existing_container_over_ssh(cmd, host: KAMAL.primary_host) }
+      end
+
+    when options[:interactive]
+      say "Get most recent version available as an image...", :magenta unless options[:version]
+      using_version(version_or_latest) do |version|
+        say "Launching interactive command with version #{version} via SSH from new container on #{KAMAL.primary_host}...", :magenta
+        run_locally do
+          exec KAMAL.app(role: KAMAL.primary_role).execute_in_new_container_over_ssh(cmd, host: KAMAL.primary_host)
+        end
+      end
+
+    when options[:reuse]
+      say "Get current version of running container...", :magenta unless options[:version]
+      using_version(options[:version] || current_running_version) do |version|
+        say "Launching command with version #{version} from existing container...", :magenta
+
+        on(KAMAL.hosts) do |host|
+          roles = KAMAL.roles_on(host)
+
+          roles.each do |role|
+            execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on app version #{version}", role: role), verbosity: :debug
+            puts_by_host host, capture_with_info(*KAMAL.app(role: role).execute_in_existing_container(cmd))
+          end
+        end
+      end
+
+    else
+      say "Get most recent version available as an image...", :magenta unless options[:version]
+      using_version(version_or_latest) do |version|
+        say "Launching command with version #{version} from new container...", :magenta
+        on(KAMAL.hosts) do |host|
+          execute *KAMAL.auditor.record("Executed cmd '#{cmd}' on app version #{version}"), verbosity: :debug
+          puts_by_host host, capture_with_info(*KAMAL.app.execute_in_new_container(cmd))
+        end
+      end
+    end
+  end
+
+  desc "containers", "Show app containers on servers"
+  def containers
+    on(KAMAL.hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.app.list_containers) }
+  end
+
+  desc "stale_containers", "Detect app stale containers"
+  option :stop, aliases: "-s", type: :boolean, default: false, desc: "Stop the stale containers found"
+  def stale_containers
+    mutating do
+      stop = options[:stop]
+
+      cli = self
+
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          cli.send(:stale_versions, host: host, role: role).each do |version|
+            if stop
+              puts_by_host host, "Stopping stale container for role #{role} with version #{version}"
+              execute *KAMAL.app(role: role).stop(version: version), raise_on_non_zero_exit: false
+            else
+              puts_by_host host,  "Detected stale container for role #{role} with version #{version} (use `kamal app stale_containers --stop` to stop)"
+            end
+          end
+        end
+      end
+    end
+  end
+
+  desc "images", "Show app images on servers"
+  def images
+    on(KAMAL.hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.app.list_images) }
+  end
+
+  desc "logs", "Show log lines from app on servers (use --help to show options)"
+  option :since, aliases: "-s", desc: "Show lines since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
+  option :lines, type: :numeric, aliases: "-n", desc: "Number of lines to show from each server"
+  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
+  option :follow, aliases: "-f", desc: "Follow log on primary server (or specific host set by --hosts)"
+  def logs
+    # FIXME: Catch when app containers aren't running
+
+    grep = options[:grep]
+
+    if options[:follow]
+      run_locally do
+        info "Following logs on #{KAMAL.primary_host}..."
+
+        KAMAL.specific_roles ||= ["web"]
+        role = KAMAL.roles_on(KAMAL.primary_host).first
+
+        info KAMAL.app(role: role).follow_logs(host: KAMAL.primary_host, grep: grep)
+        exec KAMAL.app(role: role).follow_logs(host: KAMAL.primary_host, grep: grep)
+      end
+    else
+      since = options[:since]
+      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
+
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          begin
+            puts_by_host host, capture_with_info(*KAMAL.app(role: role).logs(since: since, lines: lines, grep: grep))
+          rescue SSHKit::Command::Failed
+            puts_by_host host, "Nothing found"
+          end
+        end
+      end
+    end
+  end
+
+  desc "remove", "Remove app containers and images from servers"
+  def remove
+    mutating do
+      stop
+      remove_containers
+      remove_images
+    end
+  end
+
+  desc "remove_container [VERSION]", "Remove app container with given version from servers", hide: true
+  def remove_container(version)
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Removed app container with version #{version}", role: role), verbosity: :debug
+          execute *KAMAL.app(role: role).remove_container(version: version)
+        end
+      end
+    end
+  end
+
+  desc "remove_containers", "Remove all app containers from servers", hide: true
+  def remove_containers
+    mutating do
+      on(KAMAL.hosts) do |host|
+        roles = KAMAL.roles_on(host)
+
+        roles.each do |role|
+          execute *KAMAL.auditor.record("Removed all app containers", role: role), verbosity: :debug
+          execute *KAMAL.app(role: role).remove_containers
+        end
+      end
+    end
+  end
+
+  desc "remove_images", "Remove all app images from servers", hide: true
+  def remove_images
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Removed all app images"), verbosity: :debug
+        execute *KAMAL.app.remove_images
+      end
+    end
+  end
+
+  desc "version", "Show app version currently running on servers"
+  def version
+    on(KAMAL.hosts) do |host|
+      role = KAMAL.roles_on(host).first
+      puts_by_host host, capture_with_info(*KAMAL.app(role: role).current_running_version).strip
+    end
+  end
+
+  private
+    def using_version(new_version)
+      if new_version
+        begin
+          old_version = KAMAL.config.version
+          KAMAL.config.version = new_version
+          yield new_version
+        ensure
+          KAMAL.config.version = old_version
+        end
+      else
+        yield KAMAL.config.version
+      end
+    end
+
+    def current_running_version(host: KAMAL.primary_host)
+      version = nil
+      on(host) do
+        role = KAMAL.roles_on(host).first
+        version = capture_with_info(*KAMAL.app(role: role).current_running_version).strip
+      end
+      version.presence
+    end
+
+    def stale_versions(host:, role:)
+      versions = nil
+      on(host) do
+        versions = \
+          capture_with_info(*KAMAL.app(role: role).list_versions, raise_on_non_zero_exit: false)
+          .split("\n")
+          .drop(1)
+      end
+      versions
+    end
+
+    def version_or_latest
+      options[:version] || "latest"
+    end
+end

lib/kamal/cli/base.rb

@@ -0,0 +1,179 @@
+require "thor"
+require "dotenv"
+require "kamal/sshkit_with_ext"
+
+module Kamal::Cli
+  class Base < Thor
+    include SSHKit::DSL
+
+    def self.exit_on_failure?() true end
+
+    class_option :verbose, type: :boolean, aliases: "-v", desc: "Detailed logging"
+    class_option :quiet, type: :boolean, aliases: "-q", desc: "Minimal logging"
+
+    class_option :version, desc: "Run commands against a specific app version"
+
+    class_option :primary, type: :boolean, aliases: "-p", desc: "Run commands only on primary host instead of all"
+    class_option :hosts, aliases: "-h", desc: "Run commands on these hosts instead of all (separate by comma)"
+    class_option :roles, aliases: "-r", desc: "Run commands on these roles instead of all (separate by comma)"
+
+    class_option :config_file, aliases: "-c", default: "config/deploy.yml", desc: "Path to config file"
+    class_option :destination, aliases: "-d", desc: "Specify destination to be used for config file (staging -> deploy.staging.yml)"
+
+    class_option :skip_hooks, aliases: "-H", type: :boolean, default: false, desc: "Don't run hooks"
+
+    def initialize(*)
+      super
+      load_envs
+      initialize_commander(options_with_subcommand_class_options)
+    end
+
+    private
+      def load_envs
+        if destination = options[:destination]
+          Dotenv.load(".env.#{destination}", ".env")
+        else
+          Dotenv.load(".env")
+        end
+      end
+
+      def options_with_subcommand_class_options
+        options.merge(@_initializer.last[:class_options] || {})
+      end
+
+      def initialize_commander(options)
+        KAMAL.tap do |commander|
+          if options[:verbose]
+            ENV["VERBOSE"] = "1" # For backtraces via cli/start
+            commander.verbosity = :debug
+          end
+
+          if options[:quiet]
+            commander.verbosity = :error
+          end
+
+          commander.configure \
+            config_file: Pathname.new(File.expand_path(options[:config_file])),
+            destination: options[:destination],
+            version: options[:version]
+
+          commander.specific_hosts    = options[:hosts]&.split(",")
+          commander.specific_roles    = options[:roles]&.split(",")
+          commander.specific_primary! if options[:primary]
+        end
+      end
+
+      def print_runtime
+        started_at = Time.now
+        yield
+        return Time.now - started_at
+      ensure
+        runtime = Time.now - started_at
+        puts "  Finished all in #{sprintf("%.1f seconds", runtime)}"
+      end
+
+      def mutating
+        return yield if KAMAL.holding_lock?
+
+        KAMAL.config.ensure_env_available
+
+        run_hook "pre-connect"
+
+        ensure_run_directory
+
+        acquire_lock
+
+        begin
+          yield
+        rescue
+          if KAMAL.hold_lock_on_error?
+            error "  \e[31mDeploy lock was not released\e[0m"
+          else
+            release_lock
+          end
+
+          raise
+        end
+
+        release_lock
+      end
+
+      def acquire_lock
+        raise_if_locked do
+          say "Acquiring the deploy lock...", :magenta
+          on(KAMAL.primary_host) { execute *KAMAL.lock.acquire("Automatic deploy lock", KAMAL.config.version), verbosity: :debug }
+        end
+
+        KAMAL.holding_lock = true
+      end
+
+      def release_lock
+        say "Releasing the deploy lock...", :magenta
+        on(KAMAL.primary_host) { execute *KAMAL.lock.release, verbosity: :debug }
+
+        KAMAL.holding_lock = false
+      end
+
+      def raise_if_locked
+        yield
+      rescue SSHKit::Runner::ExecuteError => e
+        if e.message =~ /cannot create directory/
+          on(KAMAL.primary_host) { puts capture_with_debug(*KAMAL.lock.status) }
+          raise LockError, "Deploy lock found"
+        else
+          raise e
+        end
+      end
+
+      def hold_lock_on_error
+        if KAMAL.hold_lock_on_error?
+          yield
+        else
+          KAMAL.hold_lock_on_error = true
+          yield
+          KAMAL.hold_lock_on_error = false
+        end
+      end
+
+      def run_hook(hook, **extra_details)
+        if !options[:skip_hooks] && KAMAL.hook.hook_exists?(hook)
+          details = { hosts: KAMAL.hosts.join(","), command: command, subcommand: subcommand }
+
+          say "Running the #{hook} hook...", :magenta
+          run_locally do
+            KAMAL.with_verbosity(:debug) { execute *KAMAL.hook.run(hook, **details, **extra_details) }
+          rescue SSHKit::Command::Failed
+            raise HookError.new("Hook `#{hook}` failed")
+          end
+        end
+      end
+
+      def command
+        @kamal_command ||= begin
+          invocation_class, invocation_commands = *first_invocation
+          if invocation_class == Kamal::Cli::Main
+            invocation_commands[0]
+          else
+            Kamal::Cli::Main.subcommand_classes.find { |command, clazz| clazz == invocation_class }[0]
+          end
+        end
+      end
+
+      def subcommand
+        @kamal_subcommand ||= begin
+          invocation_class, invocation_commands = *first_invocation
+          invocation_commands[0] if invocation_class != Kamal::Cli::Main
+        end
+      end
+
+      def first_invocation
+        instance_variable_get("@_invocations").first
+      end
+
+      def ensure_run_directory
+        on(KAMAL.hosts) do
+          execute(*KAMAL.server.ensure_run_directory)
+        end
+      end
+    end
+end

lib/kamal/cli/build.rb

@@ -0,0 +1,123 @@
+require "uri"
+
+class Kamal::Cli::Build < Kamal::Cli::Base
+  class BuildError < StandardError; end
+
+  desc "deliver", "Build app and push app image to registry then pull image on servers"
+  def deliver
+    mutating do
+      push
+      pull
+    end
+  end
+
+  desc "push", "Build and push app image to registry"
+  def push
+    mutating do
+      cli = self
+
+      verify_local_dependencies
+      run_hook "pre-build"
+
+      if (uncommitted_changes = Kamal::Git.uncommitted_changes).present?
+        say "The following paths have uncommitted changes:\n #{uncommitted_changes}", :yellow
+      end
+
+      run_locally do
+        begin
+          KAMAL.with_verbosity(:debug) do
+            execute *KAMAL.builder.push
+          end
+        rescue SSHKit::Command::Failed => e
+          if e.message =~ /(no builder)|(no such file or directory)/
+            error "Missing compatible builder, so creating a new one first"
+
+            if cli.create
+              KAMAL.with_verbosity(:debug) { execute *KAMAL.builder.push }
+            end
+          else
+            raise
+          end
+        end
+      end
+    end
+  end
+
+  desc "pull", "Pull app image from registry onto servers"
+  def pull
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pulled image with version #{KAMAL.config.version}"), verbosity: :debug
+        execute *KAMAL.builder.clean, raise_on_non_zero_exit: false
+        execute *KAMAL.builder.pull
+        execute *KAMAL.builder.validate_image
+      end
+    end
+  end
+
+  desc "create", "Create a build setup"
+  def create
+    mutating do
+      if (remote_host = KAMAL.config.builder.remote_host)
+        connect_to_remote_host(remote_host)
+      end
+
+      run_locally do
+        begin
+          debug "Using builder: #{KAMAL.builder.name}"
+          execute *KAMAL.builder.create
+        rescue SSHKit::Command::Failed => e
+          if e.message =~ /stderr=(.*)/
+            error "Couldn't create remote builder: #{$1}"
+            false
+          else
+            raise
+          end
+        end
+      end
+    end
+  end
+
+  desc "remove", "Remove build setup"
+  def remove
+    mutating do
+      run_locally do
+        debug "Using builder: #{KAMAL.builder.name}"
+        execute *KAMAL.builder.remove
+      end
+    end
+  end
+
+  desc "details", "Show build setup"
+  def details
+    run_locally do
+      puts "Builder: #{KAMAL.builder.name}"
+      puts capture(*KAMAL.builder.info)
+    end
+  end
+
+  private
+    def verify_local_dependencies
+      run_locally do
+        begin
+          execute *KAMAL.builder.ensure_local_dependencies_installed
+        rescue SSHKit::Command::Failed => e
+          build_error = e.message =~ /command not found/ ?
+            "Docker is not installed locally" :
+            "Docker buildx plugin is not installed locally"
+
+          raise BuildError, build_error
+        end
+      end
+    end
+
+    def connect_to_remote_host(remote_host)
+      remote_uri = URI.parse(remote_host)
+      if remote_uri.scheme == "ssh"
+        options = { user: remote_uri.user, port: remote_uri.port }.compact
+        on(remote_uri.host, options) do
+          execute "true"
+        end
+      end
+    end
+end

lib/kamal/cli/env.rb

@@ -0,0 +1,56 @@
+require "tempfile"
+
+class Kamal::Cli::Env < Kamal::Cli::Base
+  desc "push", "Push the env file to the remote hosts"
+  def push
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pushed env files"), verbosity: :debug
+
+        KAMAL.roles_on(host).each do |role|
+          role_config = KAMAL.config.role(role)
+          execute *KAMAL.app(role: role).make_env_directory
+          upload! StringIO.new(role_config.env_file), role_config.host_env_file_path, mode: 400
+        end
+      end
+
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.traefik.make_env_directory
+        upload! StringIO.new(KAMAL.traefik.env_file), KAMAL.traefik.host_env_file_path, mode: 400
+      end
+
+      on(KAMAL.accessory_hosts) do
+        KAMAL.accessories_on(host).each do |accessory|
+          accessory_config = KAMAL.config.accessory(accessory)
+          execute *KAMAL.accessory(accessory).make_env_directory
+          upload! StringIO.new(accessory_config.env_file), accessory_config.host_env_file_path, mode: 400
+        end
+      end
+    end
+  end
+
+  desc "delete", "Delete the env file from the remote hosts"
+  def delete
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Deleted env files"), verbosity: :debug
+
+        KAMAL.roles_on(host).each do |role|
+          role_config = KAMAL.config.role(role)
+          execute *KAMAL.app(role: role).remove_env_file
+        end
+      end
+
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.traefik.remove_env_file
+      end
+
+      on(KAMAL.accessory_hosts) do
+        KAMAL.accessories_on(host).each do |accessory|
+          accessory_config = KAMAL.config.accessory(accessory)
+          execute *KAMAL.accessory(accessory).remove_env_file
+        end
+      end
+    end
+  end
+end

lib/kamal/cli/healthcheck.rb

@@ -0,0 +1,20 @@
+class Kamal::Cli::Healthcheck < Kamal::Cli::Base
+  default_command :perform
+
+  desc "perform", "Health check current app version"
+  def perform
+    on(KAMAL.primary_host) do
+      begin
+        execute *KAMAL.healthcheck.run
+        Poller.wait_for_healthy { capture_with_info(*KAMAL.healthcheck.status) }
+      rescue Poller::HealthcheckError => e
+        error capture_with_info(*KAMAL.healthcheck.logs)
+        error capture_with_pretty_json(*KAMAL.healthcheck.container_health_log)
+        raise
+      ensure
+        execute *KAMAL.healthcheck.stop, raise_on_non_zero_exit: false
+        execute *KAMAL.healthcheck.remove, raise_on_non_zero_exit: false
+      end
+    end
+  end
+end

lib/kamal/cli/healthcheck/poller.rb

@@ -0,0 +1,64 @@
+module Kamal::Cli::Healthcheck::Poller
+  extend self
+
+  TRAEFIK_UPDATE_DELAY = 5
+
+  class HealthcheckError < StandardError; end
+
+  def wait_for_healthy(pause_after_ready: false, &block)
+    attempt = 1
+    max_attempts = KAMAL.config.healthcheck["max_attempts"]
+
+    begin
+      case status = block.call
+      when "healthy"
+        sleep TRAEFIK_UPDATE_DELAY if pause_after_ready
+      when "running" # No health check configured
+        sleep KAMAL.config.readiness_delay if pause_after_ready
+      else
+        raise HealthcheckError, "container not ready (#{status})"
+      end
+    rescue HealthcheckError => e
+      if attempt <= max_attempts
+        info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..."
+        sleep attempt
+        attempt += 1
+        retry
+      else
+        raise
+      end
+    end
+
+    info "Container is healthy!"
+  end
+
+  def wait_for_unhealthy(pause_after_ready: false, &block)
+    attempt = 1
+    max_attempts = KAMAL.config.healthcheck["max_attempts"]
+
+    begin
+      case status = block.call
+      when "unhealthy"
+        sleep TRAEFIK_UPDATE_DELAY if pause_after_ready
+      else
+        raise HealthcheckError, "container not unhealthy (#{status})"
+      end
+    rescue HealthcheckError => e
+      if attempt <= max_attempts
+        info "#{e.message}, retrying in #{attempt}s (attempt #{attempt}/#{max_attempts})..."
+        sleep attempt
+        attempt += 1
+        retry
+      else
+        raise
+      end
+    end
+
+    info "Container is unhealthy!"
+  end
+
+  private
+    def info(message)
+      SSHKit.config.output.info(message)
+    end
+end

lib/kamal/cli/lock.rb

@@ -0,0 +1,46 @@
+class Kamal::Cli::Lock < Kamal::Cli::Base
+  desc "status", "Report lock status"
+  def status
+    handle_missing_lock do
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        puts capture_with_debug(*KAMAL.lock.status)
+      end
+    end
+  end
+
+  desc "acquire", "Acquire the deploy lock"
+  option :message, aliases: "-m", type: :string, desc: "A lock message", required: true
+  def acquire
+    message = options[:message]
+    raise_if_locked do
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        execute *KAMAL.lock.acquire(message, KAMAL.config.version), verbosity: :debug
+      end
+      say "Acquired the deploy lock"
+    end
+  end
+
+  desc "release", "Release the deploy lock"
+  def release
+    handle_missing_lock do
+      on(KAMAL.primary_host) do
+        execute *KAMAL.server.ensure_run_directory
+        execute *KAMAL.lock.release, verbosity: :debug
+      end
+      say "Released the deploy lock"
+    end
+  end
+
+  private
+    def handle_missing_lock
+      yield
+    rescue SSHKit::Runner::ExecuteError => e
+      if e.message =~ /No such file or directory/
+        say "There is no deploy lock"
+      else
+        raise
+      end
+    end
+end

lib/kamal/cli/main.rb

@@ -0,0 +1,260 @@
+class Kamal::Cli::Main < Kamal::Cli::Base
+  desc "setup", "Setup all accessories, push the env, and deploy app to servers"
+  def setup
+    print_runtime do
+      mutating do
+        say "Ensure Docker is installed...", :magenta
+        invoke "kamal:cli:server:bootstrap"
+
+        say "Push env files...", :magenta
+        invoke "kamal:cli:env:push"
+
+        invoke "kamal:cli:accessory:boot", [ "all" ]
+        deploy
+      end
+    end
+  end
+
+  desc "deploy", "Deploy app to servers"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
+  def deploy
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        say "Log into image registry...", :magenta
+        invoke "kamal:cli:registry:login", [], invoke_options
+
+        if options[:skip_push]
+          say "Pull app image...", :magenta
+          invoke "kamal:cli:build:pull", [], invoke_options
+        else
+          say "Build and push app image...", :magenta
+          invoke "kamal:cli:build:deliver", [], invoke_options
+        end
+
+        run_hook "pre-deploy"
+
+        say "Ensure Traefik is running...", :magenta
+        invoke "kamal:cli:traefik:boot", [], invoke_options
+
+        say "Ensure app can pass healthcheck...", :magenta
+        invoke "kamal:cli:healthcheck:perform", [], invoke_options
+
+        say "Detect stale containers...", :magenta
+        invoke "kamal:cli:app:stale_containers", [], invoke_options.merge(stop: true)
+
+        invoke "kamal:cli:app:boot", [], invoke_options
+
+        say "Prune old containers and images...", :magenta
+        invoke "kamal:cli:prune:all", [], invoke_options
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round
+  end
+
+  desc "redeploy", "Deploy app to servers without bootstrapping servers, starting Traefik, pruning, and registry login"
+  option :skip_push, aliases: "-P", type: :boolean, default: false, desc: "Skip image build and push"
+  def redeploy
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        if options[:skip_push]
+          say "Pull app image...", :magenta
+          invoke "kamal:cli:build:pull", [], invoke_options
+        else
+          say "Build and push app image...", :magenta
+          invoke "kamal:cli:build:deliver", [], invoke_options
+        end
+
+        run_hook "pre-deploy"
+
+        say "Ensure app can pass healthcheck...", :magenta
+        invoke "kamal:cli:healthcheck:perform", [], invoke_options
+
+        say "Detect stale containers...", :magenta
+        invoke "kamal:cli:app:stale_containers", [], invoke_options.merge(stop: true)
+
+        invoke "kamal:cli:app:boot", [], invoke_options
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round
+  end
+
+  desc "rollback [VERSION]", "Rollback app to VERSION"
+  def rollback(version)
+    rolled_back = false
+    runtime = print_runtime do
+      mutating do
+        invoke_options = deploy_options
+
+        KAMAL.config.version = version
+        old_version = nil
+
+        if container_available?(version)
+          run_hook "pre-deploy"
+
+          invoke "kamal:cli:app:boot", [], invoke_options.merge(version: version)
+          rolled_back = true
+        else
+          say "The app version '#{version}' is not available as a container (use 'kamal app containers' for available versions)", :red
+        end
+      end
+    end
+
+    run_hook "post-deploy", runtime: runtime.round if rolled_back
+  end
+
+  desc "details", "Show details about all containers"
+  def details
+    invoke "kamal:cli:traefik:details"
+    invoke "kamal:cli:app:details"
+    invoke "kamal:cli:accessory:details", [ "all" ]
+  end
+
+  desc "audit", "Show audit log from servers"
+  def audit
+    on(KAMAL.hosts) do |host|
+      puts_by_host host, capture_with_info(*KAMAL.auditor.reveal)
+    end
+  end
+
+  desc "config", "Show combined config (including secrets!)"
+  def config
+    run_locally do
+      puts Kamal::Utils.redacted(KAMAL.config.to_h).to_yaml
+    end
+  end
+
+  desc "init", "Create config stub in config/deploy.yml and env stub in .env"
+  option :bundle, type: :boolean, default: false, desc: "Add Kamal to the Gemfile and create a bin/kamal binstub"
+  def init
+    require "fileutils"
+
+    if (deploy_file = Pathname.new(File.expand_path("config/deploy.yml"))).exist?
+      puts "Config file already exists in config/deploy.yml (remove first to create a new one)"
+    else
+      FileUtils.mkdir_p deploy_file.dirname
+      FileUtils.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
+      puts "Created configuration file in config/deploy.yml"
+    end
+
+    unless (deploy_file = Pathname.new(File.expand_path(".env"))).exist?
+      FileUtils.cp_r Pathname.new(File.expand_path("templates/template.env", __dir__)), deploy_file
+      puts "Created .env file"
+    end
+
+    unless (hooks_dir = Pathname.new(File.expand_path(".kamal/hooks"))).exist?
+      hooks_dir.mkpath
+      Pathname.new(File.expand_path("templates/sample_hooks", __dir__)).each_child do |sample_hook|
+        FileUtils.cp sample_hook, hooks_dir, preserve: true
+      end
+      puts "Created sample hooks in .kamal/hooks"
+    end
+
+    if options[:bundle]
+      if (binstub = Pathname.new(File.expand_path("bin/kamal"))).exist?
+        puts "Binstub already exists in bin/kamal (remove first to create a new one)"
+      else
+        puts "Adding Kamal to Gemfile and bundle..."
+        run_locally do
+          execute :bundle, :add, :kamal
+          execute :bundle, :binstubs, :kamal
+        end
+        puts "Created binstub file in bin/kamal"
+      end
+    end
+  end
+
+  desc "envify", "Create .env by evaluating .env.erb (or .env.staging.erb -> .env.staging when using -d staging)"
+  def envify
+    if destination = options[:destination]
+      env_template_path = ".env.#{destination}.erb"
+      env_path          = ".env.#{destination}"
+    else
+      env_template_path = ".env.erb"
+      env_path          = ".env"
+    end
+
+    File.write(env_path, ERB.new(File.read(env_template_path)).result, perm: 0600)
+
+    load_envs # reload new file
+    invoke "kamal:cli:env:push", options
+  end
+
+  desc "remove", "Remove Traefik, app, accessories, and registry session from servers"
+  option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
+  def remove
+    mutating do
+      if options[:confirmed] || ask("This will remove all containers and images. Are you sure?", limited_to: %w( y N ), default: "N") == "y"
+        invoke "kamal:cli:traefik:remove", [], options.without(:confirmed)
+        invoke "kamal:cli:app:remove", [], options.without(:confirmed)
+        invoke "kamal:cli:accessory:remove", [ "all" ], options
+        invoke "kamal:cli:registry:logout", [], options.without(:confirmed)
+      end
+    end
+  end
+
+  desc "version", "Show Kamal version"
+  def version
+    puts Kamal::VERSION
+  end
+
+  desc "accessory", "Manage accessories (db/redis/search)"
+  subcommand "accessory", Kamal::Cli::Accessory
+
+  desc "app", "Manage application"
+  subcommand "app", Kamal::Cli::App
+
+  desc "build", "Build application image"
+  subcommand "build", Kamal::Cli::Build
+
+  desc "env", "Manage environment files"
+  subcommand "env", Kamal::Cli::Env
+
+  desc "healthcheck", "Healthcheck application"
+  subcommand "healthcheck", Kamal::Cli::Healthcheck
+
+  desc "lock", "Manage the deploy lock"
+  subcommand "lock", Kamal::Cli::Lock
+
+  desc "prune", "Prune old application images and containers"
+  subcommand "prune", Kamal::Cli::Prune
+
+  desc "registry", "Login and -out of the image registry"
+  subcommand "registry", Kamal::Cli::Registry
+
+  desc "server", "Bootstrap servers with curl and Docker"
+  subcommand "server", Kamal::Cli::Server
+
+  desc "traefik", "Manage Traefik load balancer"
+  subcommand "traefik", Kamal::Cli::Traefik
+
+  private
+    def container_available?(version)
+      begin
+        on(KAMAL.hosts) do
+          KAMAL.roles_on(host).each do |role|
+            container_id = capture_with_info(*KAMAL.app(role: role).container_id_for_version(version))
+            raise "Container not found" unless container_id.present?
+          end
+        end
+      rescue SSHKit::Runner::ExecuteError => e
+        if e.message =~ /Container not found/
+          say "Error looking for container version #{version}: #{e.message}"
+          return false
+        else
+          raise
+        end
+      end
+
+      true
+    end
+
+    def deploy_options
+      { "version" => KAMAL.config.version }.merge(options.without("skip_push"))
+    end
+end

lib/kamal/cli/prune.rb

@@ -0,0 +1,31 @@
+class Kamal::Cli::Prune < Kamal::Cli::Base
+  desc "all", "Prune unused images and stopped containers"
+  def all
+    mutating do
+      containers
+      images
+    end
+  end
+
+  desc "images", "Prune unused images"
+  def images
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pruned images"), verbosity: :debug
+        execute *KAMAL.prune.dangling_images
+        execute *KAMAL.prune.tagged_images
+      end
+    end
+  end
+
+  desc "containers", "Prune all stopped containers, except the last 5"
+  def containers
+    mutating do
+      on(KAMAL.hosts) do
+        execute *KAMAL.auditor.record("Pruned containers"), verbosity: :debug
+        execute *KAMAL.prune.app_containers
+        execute *KAMAL.prune.healthcheck_containers
+      end
+    end
+  end
+end

lib/kamal/cli/registry.rb

@@ -0,0 +1,18 @@
+class Kamal::Cli::Registry < Kamal::Cli::Base
+  desc "login", "Log in to registry locally and remotely"
+  def login
+    run_locally    { execute *KAMAL.registry.login }
+    on(KAMAL.hosts) { execute *KAMAL.registry.login }
+  # FIXME: This rescue needed?
+  rescue ArgumentError => e
+    puts e.message
+  end
+
+  desc "logout", "Log out of registry remotely"
+  def logout
+    on(KAMAL.hosts) { execute *KAMAL.registry.logout }
+  # FIXME: This rescue needed?
+  rescue ArgumentError => e
+    puts e.message
+  end
+end

lib/kamal/cli/server.rb

@@ -0,0 +1,23 @@
+class Kamal::Cli::Server < Kamal::Cli::Base
+  desc "bootstrap", "Set up Docker to run Kamal apps"
+  def bootstrap
+    missing = []
+
+    on(KAMAL.hosts | KAMAL.accessory_hosts) do |host|
+      unless execute(*KAMAL.docker.installed?, raise_on_non_zero_exit: false)
+        if execute(*KAMAL.docker.superuser?, raise_on_non_zero_exit: false)
+          info "Missing Docker on #{host}. Installing…"
+          execute *KAMAL.docker.install
+        else
+          missing << host
+        end
+      end
+
+      execute(*KAMAL.server.ensure_run_directory)
+    end
+
+    if missing.any?
+      raise "Docker is not installed on #{missing.join(", ")} and can't be automatically installed without having root access and the `curl` command available. Install Docker manually: https://docs.docker.com/engine/install/"
+    end
+  end
+end

lib/kamal/cli/templates/deploy.yml

@@ -0,0 +1,85 @@
+# Name of your application. Used to uniquely configure containers.
+service: my-app
+
+# Name of the container image.
+image: user/my-app
+
+# Deploy to these servers.
+servers:
+  - 192.168.0.1
+
+# Credentials for your image host.
+registry:
+  # Specify the registry server, if you're not using Docker Hub
+  # server: registry.digitalocean.com / ghcr.io / ...
+  username: my-user
+
+  # Always use an access token rather than real password when possible.
+  password:
+    - KAMAL_REGISTRY_PASSWORD
+
+# Inject ENV variables into containers (secrets come from .env).
+# Remember to run `kamal env push` after making changes!
+# env:
+#   clear:
+#     DB_HOST: 192.168.0.2
+#   secret:
+#     - RAILS_MASTER_KEY
+
+# Use a different ssh user than root
+# ssh:
+#   user: app
+
+# Configure builder setup.
+# builder:
+#   args:
+#     RUBY_VERSION: 3.2.0
+#   secrets:
+#     - GITHUB_TOKEN
+#   remote:
+#     arch: amd64
+#     host: ssh://app@192.168.0.1
+
+# Use accessory services (secrets come from .env).
+# accessories:
+#   db:
+#     image: mysql:8.0
+#     host: 192.168.0.2
+#     port: 3306
+#     env:
+#       clear:
+#         MYSQL_ROOT_HOST: '%'
+#       secret:
+#         - MYSQL_ROOT_PASSWORD
+#     files:
+#       - config/mysql/production.cnf:/etc/mysql/my.cnf
+#       - db/production.sql:/docker-entrypoint-initdb.d/setup.sql
+#     directories:
+#       - data:/var/lib/mysql
+#   redis:
+#     image: redis:7.0
+#     host: 192.168.0.2
+#     port: 6379
+#     directories:
+#       - data:/data
+
+# Configure custom arguments for Traefik
+# traefik:
+#   args:
+#     accesslog: true
+#     accesslog.format: json
+
+# Configure a custom healthcheck (default is /up on port 3000)
+# healthcheck:
+#   path: /healthz
+#   port: 4000
+
+# Bridge fingerprinted assets, like JS and CSS, between versions to avoid
+# hitting 404 on in-flight requests. Combines all files from new and old
+# version inside the asset_path.
+# asset_path: /rails/public/assets
+
+# Configure rolling deploys by setting a wait time between batches of restarts.
+# boot:
+#   limit: 10 # Can also specify as a percentage of total hosts, such as "25%"
+#   wait: 2

lib/kamal/cli/templates/sample_hooks/post-deploy.sample

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# A sample post-deploy hook
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+echo "$KAMAL_PERFORMER deployed $KAMAL_VERSION to $KAMAL_DESTINATION in $KAMAL_RUNTIME seconds"

lib/kamal/cli/templates/sample_hooks/pre-build.sample

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+# A sample pre-build hook
+#
+# Checks:
+# 1. We have a clean checkout
+# 2. A remote is configured
+# 3. The branch has been pushed to the remote
+# 4. The version we are deploying matches the remote
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+if [ -n "$(git status --porcelain)" ]; then
+  echo "Git checkout is not clean, aborting..." >&2
+  git status --porcelain >&2
+  exit 1
+fi
+
+first_remote=$(git remote)
+
+if [ -z "$first_remote" ]; then
+  echo "No git remote set, aborting..." >&2
+  exit 1
+fi
+
+current_branch=$(git branch --show-current)
+
+if [ -z "$current_branch" ]; then
+  echo "No git remote set, aborting..." >&2
+  exit 1
+fi
+
+remote_head=$(git ls-remote $first_remote --tags $current_branch | cut -f1)
+
+if [ -z "$remote_head" ]; then
+  echo "Branch not pushed to remote, aborting..." >&2
+  exit 1
+fi
+
+if [ "$KAMAL_VERSION" != "$remote_head" ]; then
+  echo "Version ($KAMAL_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
+  exit 1
+fi
+
+exit 0

lib/kamal/cli/templates/sample_hooks/pre-connect.sample

@@ -0,0 +1,47 @@
+#!/usr/bin/env ruby
+
+# A sample pre-connect check
+#
+# Warms DNS before connecting to hosts in parallel
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+hosts = ENV["KAMAL_HOSTS"].split(",")
+results = nil
+max = 3
+
+elapsed = Benchmark.realtime do
+  results = hosts.map do |host|
+    Thread.new do
+      tries = 1
+
+      begin
+        Socket.getaddrinfo(host, 0, Socket::AF_UNSPEC, Socket::SOCK_STREAM, nil, Socket::AI_CANONNAME)
+      rescue SocketError
+        if tries < max
+          puts "Retrying DNS warmup: #{host}"
+          tries += 1
+          sleep rand
+          retry
+        else
+          puts "DNS warmup failed: #{host}"
+          host
+        end
+      end
+
+      tries
+    end
+  end.map(&:value)
+end
+
+retries = results.sum - hosts.size
+nopes = results.count { |r| r == max }
+
+puts "Prewarmed %d DNS lookups in %.2f sec: %d retries, %d failures" % [ hosts.size, elapsed, retries, nopes ]

lib/kamal/cli/templates/sample_hooks/pre-deploy.sample

@@ -0,0 +1,109 @@
+#!/usr/bin/env ruby
+
+# A sample pre-deploy hook
+#
+# Checks the Github status of the build, waiting for a pending build to complete for up to 720 seconds.
+#
+# Fails unless the combined status is "success"
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_COMMAND
+# KAMAL_SUBCOMMAND
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+# Only check the build status for production deployments
+if ENV["KAMAL_COMMAND"] == "rollback" || ENV["KAMAL_DESTINATION"] != "production"
+  exit 0
+end
+
+require "bundler/inline"
+
+# true = install gems so this is fast on repeat invocations
+gemfile(true, quiet: true) do
+  source "https://rubygems.org"
+
+  gem "octokit"
+  gem "faraday-retry"
+end
+
+MAX_ATTEMPTS = 72
+ATTEMPTS_GAP = 10
+
+def exit_with_error(message)
+  $stderr.puts message
+  exit 1
+end
+
+class GithubStatusChecks
+  attr_reader :remote_url, :git_sha, :github_client, :combined_status
+
+  def initialize
+    @remote_url = `git config --get remote.origin.url`.strip.delete_prefix("https://github.com/")
+    @git_sha = `git rev-parse HEAD`.strip
+    @github_client = Octokit::Client.new(access_token: ENV["GITHUB_TOKEN"])
+    refresh!
+  end
+
+  def refresh!
+    @combined_status = github_client.combined_status(remote_url, git_sha)
+  end
+
+  def state
+    combined_status[:state]
+  end
+
+  def first_status_url
+    first_status = combined_status[:statuses].find { |status| status[:state] == state }
+    first_status && first_status[:target_url]
+  end
+
+  def complete_count
+    combined_status[:statuses].count { |status| status[:state] != "pending"}
+  end
+
+  def total_count
+    combined_status[:statuses].count
+  end
+
+  def current_status
+    if total_count > 0
+      "Completed #{complete_count}/#{total_count} checks, see #{first_status_url} ..."
+    else
+      "Build not started..."
+    end
+  end
+end
+
+
+$stdout.sync = true
+
+puts "Checking build status..."
+attempts = 0
+checks = GithubStatusChecks.new
+
+begin
+  loop do
+    case checks.state
+    when "success"
+      puts "Checks passed, see #{checks.first_status_url}"
+      exit 0
+    when "failure"
+      exit_with_error "Checks failed, see #{checks.first_status_url}"
+    when "pending"
+      attempts += 1
+    end
+
+    exit_with_error "Checks are still pending, gave up after #{MAX_ATTEMPTS * ATTEMPTS_GAP} seconds" if attempts == MAX_ATTEMPTS
+
+    puts checks.current_status
+    sleep(ATTEMPTS_GAP)
+    checks.refresh!
+  end
+rescue Octokit::NotFound
+  exit_with_error "Build status could not be found"
+end

lib/kamal/cli/templates/template.env

@@ -0,0 +1,2 @@
+KAMAL_REGISTRY_PASSWORD=change-this
+RAILS_MASTER_KEY=another-env

lib/kamal/cli/traefik.rb

@@ -0,0 +1,111 @@
+class Kamal::Cli::Traefik < Kamal::Cli::Base
+  desc "boot", "Boot Traefik on servers"
+  def boot
+    mutating do
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.registry.login
+        execute *KAMAL.traefik.start_or_run
+      end
+    end
+  end
+
+  desc "reboot", "Reboot Traefik on servers (stop container, remove container, start new container)"
+  option :rolling, type: :boolean, default: false, desc: "Reboot traefik on hosts in sequence, rather than in parallel"
+  def reboot
+    mutating do
+      on(KAMAL.traefik_hosts, in: options[:rolling] ? :sequence : :parallel) do
+        execute *KAMAL.auditor.record("Rebooted traefik"), verbosity: :debug
+        execute *KAMAL.registry.login
+        execute *KAMAL.traefik.stop
+        execute *KAMAL.traefik.remove_container
+        execute *KAMAL.traefik.run
+      end
+    end
+  end
+
+  desc "start", "Start existing Traefik container on servers"
+  def start
+    mutating do
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.auditor.record("Started traefik"), verbosity: :debug
+        execute *KAMAL.traefik.start
+      end
+    end
+  end
+
+  desc "stop", "Stop existing Traefik container on servers"
+  def stop
+    mutating do
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.auditor.record("Stopped traefik"), verbosity: :debug
+        execute *KAMAL.traefik.stop
+      end
+    end
+  end
+
+  desc "restart", "Restart existing Traefik container on servers"
+  def restart
+    mutating do
+      stop
+      start
+    end
+  end
+
+  desc "details", "Show details about Traefik container from servers"
+  def details
+    on(KAMAL.traefik_hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.traefik.info), type: "Traefik" }
+  end
+
+  desc "logs", "Show log lines from Traefik on servers"
+  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
+  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
+  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
+  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
+  def logs
+    grep = options[:grep]
+
+    if options[:follow]
+      run_locally do
+        info "Following logs on #{KAMAL.primary_host}..."
+        info KAMAL.traefik.follow_logs(host: KAMAL.primary_host, grep: grep)
+        exec KAMAL.traefik.follow_logs(host: KAMAL.primary_host, grep: grep)
+      end
+    else
+      since = options[:since]
+      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
+
+      on(KAMAL.traefik_hosts) do |host|
+        puts_by_host host, capture(*KAMAL.traefik.logs(since: since, lines: lines, grep: grep)), type: "Traefik"
+      end
+    end
+  end
+
+  desc "remove", "Remove Traefik container and image from servers"
+  def remove
+    mutating do
+      stop
+      remove_container
+      remove_image
+    end
+  end
+
+  desc "remove_container", "Remove Traefik container from servers", hide: true
+  def remove_container
+    mutating do
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.auditor.record("Removed traefik container"), verbosity: :debug
+        execute *KAMAL.traefik.remove_container
+      end
+    end
+  end
+
+  desc "remove_image", "Remove Traefik image from servers", hide: true
+  def remove_image
+    mutating do
+      on(KAMAL.traefik_hosts) do
+        execute *KAMAL.auditor.record("Removed traefik image"), verbosity: :debug
+        execute *KAMAL.traefik.remove_image
+      end
+    end
+  end
+end

lib/kamal/commander.rb

@@ -0,0 +1,167 @@
+require "active_support/core_ext/enumerable"
+require "active_support/core_ext/module/delegation"
+
+class Kamal::Commander
+  attr_accessor :verbosity, :holding_lock, :hold_lock_on_error
+
+  def initialize
+    self.verbosity = :info
+    self.holding_lock = false
+    self.hold_lock_on_error = false
+  end
+
+  def config
+    @config ||= Kamal::Configuration.create_from(**@config_kwargs).tap do |config|
+      @config_kwargs = nil
+      configure_sshkit_with(config)
+    end
+  end
+
+  def configure(**kwargs)
+    @config, @config_kwargs = nil, kwargs
+  end
+
+  attr_reader :specific_roles, :specific_hosts
+
+  def specific_primary!
+    self.specific_hosts = [ config.primary_web_host ]
+  end
+
+  def specific_roles=(role_names)
+    @specific_roles = config.roles.select { |r| role_names.include?(r.name) } if role_names.present?
+  end
+
+  def specific_hosts=(hosts)
+    @specific_hosts = config.all_hosts & hosts if hosts.present?
+  end
+
+  def primary_host
+    specific_hosts&.first || specific_roles&.first&.primary_host || config.primary_web_host
+  end
+
+  def primary_role
+    roles_on(primary_host).first
+  end
+
+  def roles
+    (specific_roles || config.roles).select do |role|
+      ((specific_hosts || config.all_hosts) & role.hosts).any?
+    end
+  end
+
+  def hosts
+    (specific_hosts || config.all_hosts).select do |host|
+      (specific_roles || config.roles).flat_map(&:hosts).include?(host)
+    end
+  end
+
+  def roles_on(host)
+    roles.select { |role| role.hosts.include?(host.to_s) }.map(&:name)
+  end
+
+  def traefik_hosts
+    specific_hosts || config.traefik_hosts
+  end
+
+  def accessory_hosts
+    specific_hosts || config.accessories.flat_map(&:hosts)
+  end
+
+  def accessory_names
+    config.accessories&.collect(&:name) || []
+  end
+
+  def accessories_on(host)
+    config.accessories.select { |accessory| accessory.hosts.include?(host.to_s) }.map(&:name)
+  end
+
+
+  def app(role: nil)
+    Kamal::Commands::App.new(config, role: role)
+  end
+
+  def accessory(name)
+    Kamal::Commands::Accessory.new(config, name: name)
+  end
+
+  def auditor(**details)
+    Kamal::Commands::Auditor.new(config, **details)
+  end
+
+  def builder
+    @builder ||= Kamal::Commands::Builder.new(config)
+  end
+
+  def docker
+    @docker ||= Kamal::Commands::Docker.new(config)
+  end
+
+  def healthcheck
+    @healthcheck ||= Kamal::Commands::Healthcheck.new(config)
+  end
+
+  def hook
+    @hook ||= Kamal::Commands::Hook.new(config)
+  end
+
+  def lock
+    @lock ||= Kamal::Commands::Lock.new(config)
+  end
+
+  def prune
+    @prune ||= Kamal::Commands::Prune.new(config)
+  end
+
+  def registry
+    @registry ||= Kamal::Commands::Registry.new(config)
+  end
+
+  def server
+    @server ||= Kamal::Commands::Server.new(config)
+  end
+
+  def traefik
+    @traefik ||= Kamal::Commands::Traefik.new(config)
+  end
+
+
+  def with_verbosity(level)
+    old_level = self.verbosity
+
+    self.verbosity = level
+    SSHKit.config.output_verbosity = level
+
+    yield
+  ensure
+    self.verbosity = old_level
+    SSHKit.config.output_verbosity = old_level
+  end
+
+  def boot_strategy
+    if config.boot.limit.present?
+      { in: :groups, limit: config.boot.limit, wait: config.boot.wait }
+    else
+      {}
+    end
+  end
+
+  def holding_lock?
+    self.holding_lock
+  end
+
+  def hold_lock_on_error?
+    self.hold_lock_on_error
+  end
+
+  private
+    # Lazy setup of SSHKit
+    def configure_sshkit_with(config)
+      SSHKit::Backend::Netssh.pool.idle_timeout = config.sshkit.pool_idle_timeout
+      SSHKit::Backend::Netssh.configure do |sshkit|
+        sshkit.max_concurrent_starts = config.sshkit.max_concurrent_starts
+        sshkit.ssh_options = config.ssh.options
+      end
+      SSHKit.config.command_map[:docker] = "docker" # No need to use /usr/bin/env, just clogs up the logs
+      SSHKit.config.output_verbosity = verbosity
+    end
+end

lib/kamal/commands.rb

@@ -0,0 +1,2 @@
+module Kamal::Commands
+end

lib/kamal/commands/accessory.rb

@@ -1,8 +1,7 @@
-require "mrsk/commands/base"
+class Kamal::Commands::Accessory < Kamal::Commands::Base
-
-class Mrsk::Commands::Accessory < Mrsk::Commands::Base
   attr_reader :accessory_config
-  delegate :service_name, :image, :host, :port, :files, :directories, :env_args, :volume_args, :label_args, to: :accessory_config
+  delegate :service_name, :image, :hosts, :port, :files, :directories, :cmd,
+           :publish_args, :env_args, :volume_args, :label_args, :option_args, to: :accessory_config
 
   def initialize(config, name:)
     super(config)
@@ -12,13 +11,16 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
   def run
     docker :run,
       "--name", service_name,
-      "-d",
+      "--detach",
       "--restart", "unless-stopped",
-      "-p", port,
+      *config.logging_args,
+      *publish_args,
       *env_args,
       *volume_args,
       *label_args,
-      image
+      *option_args,
+      image,
+      cmd
   end
 
   def start
@@ -33,27 +35,29 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
     docker :ps, *service_filter
   end
 
+
   def logs(since: nil, lines: nil, grep: nil)
     pipe \
-      docker(:logs, service_name, (" --since #{since}" if since), (" -n #{lines}" if lines), "-t", "2>&1"),
+      docker(:logs, service_name, (" --since #{since}" if since), (" --tail #{lines}" if lines), "--timestamps", "2>&1"),
       ("grep '#{grep}'" if grep)
   end
 
   def follow_logs(grep: nil)
-    run_over_ssh pipe(
+    run_over_ssh \
-      docker(:logs, service_name, "-t", "-n", "10", "-f", "2>&1"),
+      pipe \
+        docker(:logs, service_name, "--timestamps", "--tail", "10", "--follow", "2>&1"),
         (%(grep "#{grep}") if grep)
-    ).join(" ")
   end
 
-  def exec(*command, interactive: false)
+
+  def execute_in_existing_container(*command, interactive: false)
     docker :exec,
       ("-it" if interactive),
       service_name,
       *command
   end
 
-  def run_exec(*command, interactive: false)
+  def execute_in_new_container(*command, interactive: false)
     docker :run,
       ("-it" if interactive),
       "--rm",
@@ -63,17 +67,18 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
       *command
   end
 
+  def execute_in_existing_container_over_ssh(*command)
+    run_over_ssh execute_in_existing_container(*command, interactive: true)
+  end
+
+  def execute_in_new_container_over_ssh(*command)
+    run_over_ssh execute_in_new_container(*command, interactive: true)
+  end
+
   def run_over_ssh(command)
-    super command, host: host
+    super command, host: hosts.first
   end
 
-  def exec_over_ssh(*command)
-    run_over_ssh run_exec(*command, interactive: true).join(" ")
-  end
-
-  def bash
-    exec_over_ssh "bash"
-  end
 
   def ensure_local_file_present(local_file)
     if !local_file.is_a?(StringIO) && !Pathname.new(local_file).exist?
@@ -81,24 +86,24 @@ class Mrsk::Commands::Accessory < Mrsk::Commands::Base
     end
   end
 
-  def make_directory_for(remote_file)
-    make_directory Pathname.new(remote_file).dirname.to_s
-  end
-
-  def make_directory(path)
-    [ :mkdir, "-p", path ]
-  end
-
   def remove_service_directory
     [ :rm, "-rf", service_name ]
   end
 
   def remove_container
-    docker :container, :prune, "-f", *service_filter
+    docker :container, :prune, "--force", *service_filter
   end
 
   def remove_image
-    docker :image, :prune, "-a", "-f", *service_filter
+    docker :image, :rm, "--force", image
+  end
+
+  def make_env_directory
+    make_directory accessory_config.host_env_directory
+  end
+
+  def remove_env_file
+    [:rm, "-f", accessory_config.host_env_file_path]
   end
 
   private

lib/kamal/commands/app.rb

@@ -0,0 +1,101 @@
+class Kamal::Commands::App < Kamal::Commands::Base
+  include Assets, Containers, Cord, Execution, Images, Logging
+
+  ACTIVE_DOCKER_STATUSES = [ :running, :restarting ]
+
+  attr_reader :role, :role_config
+
+  def initialize(config, role: nil)
+    super(config)
+    @role = role
+    @role_config = config.role(self.role)
+  end
+
+  def run(hostname: nil)
+    docker :run,
+      "--detach",
+      "--restart unless-stopped",
+      "--name", container_name,
+      *(["--hostname", hostname] if hostname),
+      "-e", "KAMAL_CONTAINER_NAME=\"#{container_name}\"",
+      *role_config.env_args,
+      *role_config.health_check_args,
+      *config.logging_args,
+      *config.volume_args,
+      *role_config.asset_volume_args,
+      *role_config.label_args,
+      *role_config.option_args,
+      config.absolute_image,
+      role_config.cmd
+  end
+
+  def start
+    docker :start, container_name
+  end
+
+  def status(version:)
+    pipe container_id_for_version(version), xargs(docker(:inspect, "--format", DOCKER_HEALTH_STATUS_FORMAT))
+  end
+
+  def stop(version: nil)
+    pipe \
+      version ? container_id_for_version(version) : current_running_container_id,
+      xargs(config.stop_wait_time ? docker(:stop, "-t", config.stop_wait_time) : docker(:stop))
+  end
+
+  def info
+    docker :ps, *filter_args
+  end
+
+
+  def current_running_container_id
+    docker :ps, "--quiet", *filter_args(statuses: ACTIVE_DOCKER_STATUSES), "--latest"
+  end
+
+  def container_id_for_version(version, only_running: false)
+    container_id_for(container_name: container_name(version), only_running: only_running)
+  end
+
+  def current_running_version
+    list_versions("--latest", statuses: ACTIVE_DOCKER_STATUSES)
+  end
+
+  def list_versions(*docker_args, statuses: nil)
+    pipe \
+      docker(:ps, *filter_args(statuses: statuses), *docker_args, "--format", '"{{.Names}}"'),
+      %(while read line; do echo ${line##{role_config.container_prefix}-}; done) # Extract SHA from "service-role-dest-SHA"
+  end
+
+
+  def make_env_directory
+    make_directory role_config.host_env_directory
+  end
+
+  def remove_env_file
+    [ :rm, "-f", role_config.host_env_file_path ]
+  end
+
+
+  private
+    def container_name(version = nil)
+      [ role_config.container_prefix, version || config.version ].compact.join("-")
+    end
+
+    def filter_args(statuses: nil)
+      argumentize "--filter", filters(statuses: statuses)
+    end
+
+    def service_role_dest
+      [ config.service, role, config.destination ].compact.join("-")
+    end
+
+    def filters(statuses: nil)
+      [ "label=service=#{config.service}" ].tap do |filters|
+        filters << "label=destination=#{config.destination}" if config.destination
+        filters << "label=role=#{role}" if role
+        statuses&.each do |status|
+          filters << "status=#{status}"
+        end
+      end
+    end
+end

lib/kamal/commands/app/assets.rb

@@ -0,0 +1,51 @@
+module Kamal::Commands::App::Assets
+  def extract_assets
+    asset_container = "#{role_config.container_prefix}-assets"
+
+    combine \
+      make_directory(role_config.asset_extracted_path),
+      [*docker(:stop, "-t 1", asset_container, "2> /dev/null"), "|| true"],
+      docker(:run, "--name", asset_container, "--detach", "--rm", config.latest_image, "sleep 1000000"),
+      docker(:cp, "-L", "#{asset_container}:#{role_config.asset_path}/.", role_config.asset_extracted_path),
+      docker(:stop, "-t 1", asset_container),
+      by: "&&"
+  end
+
+  def sync_asset_volumes(old_version: nil)
+    new_extracted_path, new_volume_path = role_config.asset_extracted_path(config.version), role_config.asset_volume.host_path
+    if old_version.present?
+      old_extracted_path, old_volume_path = role_config.asset_extracted_path(old_version), role_config.asset_volume(old_version).host_path
+    end
+
+    commands = [make_directory(new_volume_path), copy_contents(new_extracted_path, new_volume_path)]
+
+    if old_version.present?
+      commands << copy_contents(new_extracted_path, old_volume_path, continue_on_error: true)
+      commands << copy_contents(old_extracted_path, new_volume_path, continue_on_error: true)
+    end
+
+    chain *commands
+  end
+
+  def clean_up_assets
+    chain \
+      find_and_remove_older_siblings(role_config.asset_extracted_path),
+      find_and_remove_older_siblings(role_config.asset_volume_path)
+  end
+
+  private
+    def find_and_remove_older_siblings(path)
+      [
+        :find,
+        Pathname.new(path).dirname.to_s,
+        "-maxdepth 1",
+        "-name", "'#{role_config.container_prefix}-*'",
+        "!", "-name", Pathname.new(path).basename.to_s,
+        "-exec rm -rf \"{}\" +"
+      ]
+    end
+
+    def copy_contents(source, destination, continue_on_error: false)
+      [ :cp, "-rnT", "#{source}", destination, *("|| true" if continue_on_error)]
+    end
+end

lib/kamal/commands/app/containers.rb

@@ -0,0 +1,23 @@
+module Kamal::Commands::App::Containers
+  def list_containers
+    docker :container, :ls, "--all", *filter_args
+  end
+
+  def list_container_names
+    [ *list_containers, "--format", "'{{ .Names }}'" ]
+  end
+
+  def remove_container(version:)
+    pipe \
+      container_id_for(container_name: container_name(version)),
+      xargs(docker(:container, :rm))
+  end
+
+  def rename_container(version:, new_version:)
+    docker :rename, container_name(version), container_name(new_version)
+  end
+
+  def remove_containers
+    docker :container, :prune, "--force", *filter_args
+  end
+end

lib/kamal/commands/app/cord.rb

@@ -0,0 +1,22 @@
+module Kamal::Commands::App::Cord
+  def cord(version:)
+    pipe \
+      docker(:inspect, "-f '{{ range .Mounts }}{{printf \"%s %s\\n\" .Source .Destination}}{{ end }}'", container_name(version)),
+      [:awk, "'$2 == \"#{role_config.cord_volume.container_path}\" {print $1}'"]
+  end
+
+  def tie_cord(cord)
+    create_empty_file(cord)
+  end
+
+  def cut_cord(cord)
+    remove_directory(cord)
+  end
+  
+  private    
+    def create_empty_file(file)
+      chain \
+        make_directory_for(file),
+        [:touch, file]
+    end
+end

lib/kamal/commands/app/execution.rb

@@ -0,0 +1,27 @@
+module Kamal::Commands::App::Execution
+  def execute_in_existing_container(*command, interactive: false)
+    docker :exec,
+      ("-it" if interactive),
+      container_name,
+      *command
+  end
+
+  def execute_in_new_container(*command, interactive: false)
+    docker :run,
+      ("-it" if interactive),
+      "--rm",
+      *role_config&.env_args,
+      *config.volume_args,
+      *role_config&.option_args,
+      config.absolute_image,
+      *command
+  end
+
+  def execute_in_existing_container_over_ssh(*command, host:)
+    run_over_ssh execute_in_existing_container(*command, interactive: true), host: host
+  end
+
+  def execute_in_new_container_over_ssh(*command, host:)
+    run_over_ssh execute_in_new_container(*command, interactive: true), host: host
+  end
+end

lib/kamal/commands/app/images.rb

@@ -0,0 +1,13 @@
+module Kamal::Commands::App::Images
+  def list_images
+    docker :image, :ls, config.repository
+  end
+
+  def remove_images
+    docker :image, :prune, "--all", "--force", *filter_args
+  end
+
+  def tag_current_image_as_latest
+    docker :tag, config.absolute_image, config.latest_image
+  end
+end

lib/kamal/commands/app/logging.rb

@@ -0,0 +1,18 @@
+module Kamal::Commands::App::Logging
+  def logs(since: nil, lines: nil, grep: nil)
+    pipe \
+      current_running_container_id,
+      "xargs docker logs#{" --since #{since}" if since}#{" --tail #{lines}" if lines} 2>&1",
+      ("grep '#{grep}'" if grep)
+  end
+
+  def follow_logs(host:, grep: nil)
+    run_over_ssh \
+      pipe(
+        current_running_container_id,
+        "xargs docker logs --timestamps --tail 10 --follow 2>&1",
+        (%(grep "#{grep}") if grep)
+      ),
+      host: host
+  end
+end

lib/kamal/commands/auditor.rb

@@ -0,0 +1,30 @@
+class Kamal::Commands::Auditor < Kamal::Commands::Base
+  attr_reader :details
+
+  def initialize(config, **details)
+    super(config)
+    @details = details
+  end
+
+  # Runs remotely
+  def record(line, **details)
+    append \
+      [ :echo, audit_tags(**details).except(:version, :service_version).to_s, line ],
+      audit_log_file
+  end
+
+  def reveal
+    [ :tail, "-n", 50, audit_log_file ]
+  end
+
+  private
+    def audit_log_file
+      file = [ config.service, config.destination, "audit.log" ].compact.join("-")
+
+      "#{config.run_directory}/#{file}"
+    end
+
+    def audit_tags(**details)
+      tags(**self.details, **details)
+    end
+end

lib/kamal/commands/base.rb

@@ -0,0 +1,77 @@
+module Kamal::Commands
+  class Base
+    delegate :sensitive, :argumentize, to: Kamal::Utils
+
+    DOCKER_HEALTH_STATUS_FORMAT = "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'"
+    DOCKER_HEALTH_LOG_FORMAT    = "'{{json .State.Health}}'"
+
+    attr_accessor :config
+
+    def initialize(config)
+      @config = config
+    end
+
+    def run_over_ssh(*command, host:)
+      "ssh".tap do |cmd|
+        if config.ssh.proxy && config.ssh.proxy.is_a?(Net::SSH::Proxy::Jump)
+          cmd << " -J #{config.ssh.proxy.jump_proxies}"
+        elsif config.ssh.proxy && config.ssh.proxy.is_a?(Net::SSH::Proxy::Command)
+          cmd << " -o ProxyCommand='#{config.ssh.proxy.command_line_template}'"
+        end
+        cmd << " -t #{config.ssh.user}@#{host} '#{command.join(" ")}'"
+      end
+    end
+
+    def container_id_for(container_name:, only_running: false)
+      docker :container, :ls, *("--all" unless only_running), "--filter", "name=^#{container_name}$", "--quiet"
+    end
+
+    def make_directory_for(remote_file)
+      make_directory Pathname.new(remote_file).dirname.to_s
+    end
+
+    def make_directory(path)
+      [ :mkdir, "-p", path ]
+    end
+
+    def remove_directory(path)
+      [ :rm, "-r", path ]
+    end
+
+    private
+      def combine(*commands, by: "&&")
+        commands
+          .compact
+          .collect { |command| Array(command) + [ by ] }.flatten # Join commands
+          .tap     { |commands| commands.pop } # Remove trailing combiner
+      end
+
+      def chain(*commands)
+        combine *commands, by: ";"
+      end
+
+      def pipe(*commands)
+        combine *commands, by: "|"
+      end
+
+      def append(*commands)
+        combine *commands, by: ">>"
+      end
+
+      def write(*commands)
+        combine *commands, by: ">"
+      end
+
+      def xargs(command)
+        [ :xargs, command ].flatten
+      end
+
+      def docker(*args)
+        args.compact.unshift :docker
+      end
+
+      def tags(**details)
+        Kamal::Tags.from_config(config, **details)
+      end
+  end
+end

lib/kamal/commands/builder.rb

@@ -0,0 +1,64 @@
+require "active_support/core_ext/string/filters"
+
+class Kamal::Commands::Builder < Kamal::Commands::Base
+  delegate :create, :remove, :push, :clean, :pull, :info, :validate_image, to: :target
+
+  def name
+    target.class.to_s.remove("Kamal::Commands::Builder::").underscore.inquiry
+  end
+
+  def target
+    case
+    when !config.builder.multiarch? && !config.builder.cached?
+      native
+    when !config.builder.multiarch? && config.builder.cached?
+      native_cached
+    when config.builder.local? && config.builder.remote?
+      multiarch_remote
+    when config.builder.remote?
+      native_remote
+    else
+      multiarch
+    end
+  end
+
+  def native
+    @native ||= Kamal::Commands::Builder::Native.new(config)
+  end
+
+  def native_cached
+    @native ||= Kamal::Commands::Builder::Native::Cached.new(config)
+  end
+
+  def native_remote
+    @native ||= Kamal::Commands::Builder::Native::Remote.new(config)
+  end
+
+  def multiarch
+    @multiarch ||= Kamal::Commands::Builder::Multiarch.new(config)
+  end
+
+  def multiarch_remote
+    @multiarch_remote ||= Kamal::Commands::Builder::Multiarch::Remote.new(config)
+  end
+
+
+  def ensure_local_dependencies_installed
+    if name.native?
+      ensure_local_docker_installed
+    else
+      combine \
+        ensure_local_docker_installed,
+        ensure_local_buildx_installed
+    end
+  end
+
+  private
+    def ensure_local_docker_installed
+      docker "--version"
+    end
+
+    def ensure_local_buildx_installed
+      docker :buildx, "version"
+    end
+end

lib/kamal/commands/builder/base.rb

@@ -0,0 +1,66 @@
+
+class Kamal::Commands::Builder::Base < Kamal::Commands::Base
+  class BuilderError < StandardError; end
+
+  delegate :argumentize, to: Kamal::Utils
+  delegate :args, :secrets, :dockerfile, :local_arch, :local_host, :remote_arch, :remote_host, :cache_from, :cache_to, to: :builder_config
+
+  def clean
+    docker :image, :rm, "--force", config.absolute_image
+  end
+
+  def pull
+    docker :pull, config.absolute_image
+  end
+
+  def build_options
+    [ *build_tags, *build_cache, *build_labels, *build_args, *build_secrets, *build_dockerfile ]
+  end
+
+  def build_context
+    config.builder.context
+  end
+
+  def validate_image
+    pipe \
+      docker(:inspect, "-f", "'{{ .Config.Labels.service }}'", config.absolute_image),
+      [:grep, "-x", config.service, "||", "(echo \"Image #{config.absolute_image} is missing the `service` label\" && exit 1)"]
+  end
+
+
+  private
+    def build_tags
+      [ "-t", config.absolute_image, "-t", config.latest_image ]
+    end
+
+    def build_cache
+      if cache_to && cache_from
+        ["--cache-to", cache_to,
+          "--cache-from", cache_from]
+      end
+    end
+
+    def build_labels
+      argumentize "--label", { service: config.service }
+    end
+
+    def build_args
+      argumentize "--build-arg", args, sensitive: true
+    end
+
+    def build_secrets
+      argumentize "--secret", secrets.collect { |secret| [ "id", secret ] }
+    end
+
+    def build_dockerfile
+      if Pathname.new(File.expand_path(dockerfile)).exist?
+        argumentize "--file", dockerfile
+      else
+        raise BuilderError, "Missing #{dockerfile}"
+      end
+    end
+
+    def builder_config
+      config.builder
+    end
+end

lib/kamal/commands/builder/multiarch.rb

@@ -1,6 +1,4 @@
-require "mrsk/commands/builder/base"
+class Kamal::Commands::Builder::Multiarch < Kamal::Commands::Builder::Base
-
-class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Builder::Base
   def create
     docker :buildx, :create, "--use", "--name", builder_name
   end
@@ -14,10 +12,8 @@ class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Builder::Base
       "--push",
       "--platform", "linux/amd64,linux/arm64",
       "--builder", builder_name,
-      "-t", config.absolute_image,
+      *build_options,
-      *build_args,
+      build_context
-      *build_secrets,
-      "."
   end
 
   def info
@@ -28,6 +24,6 @@ class Mrsk::Commands::Builder::Multiarch < Mrsk::Commands::Builder::Base
 
   private
     def builder_name
-      "mrsk-#{config.service}-multiarch"
+      "kamal-#{config.service}-multiarch"
     end
 end

lib/kamal/commands/builder/multiarch/remote.rb

@@ -1,6 +1,4 @@
-require "mrsk/commands/builder/multiarch"
+class Kamal::Commands::Builder::Multiarch::Remote < Kamal::Commands::Builder::Multiarch
-
-class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Multiarch
   def create
     combine \
       create_contexts,
@@ -24,17 +22,17 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
     end
 
     def create_local_buildx
-      docker :buildx, :create, "--name", builder_name, builder_name_with_arch(local["arch"]), "--platform", "linux/#{local["arch"]}"
+      docker :buildx, :create, "--name", builder_name, builder_name_with_arch(local_arch), "--platform", "linux/#{local_arch}"
     end
 
     def append_remote_buildx
-      docker :buildx, :create, "--append", "--name", builder_name, builder_name_with_arch(remote["arch"]), "--platform", "linux/#{remote["arch"]}"
+      docker :buildx, :create, "--append", "--name", builder_name, builder_name_with_arch(remote_arch), "--platform", "linux/#{remote_arch}"
     end
 
     def create_contexts
       combine \
-        create_context(local["arch"], local["host"]),
+        create_context(local_arch, local_host),
-        create_context(remote["arch"], remote["host"])
+        create_context(remote_arch, remote_host)
     end
 
     def create_context(arch, host)
@@ -43,19 +41,11 @@ class Mrsk::Commands::Builder::Multiarch::Remote < Mrsk::Commands::Builder::Mult
 
     def remove_contexts
       combine \
-        remove_context(local["arch"]),
+        remove_context(local_arch),
-        remove_context(remote["arch"])
+        remove_context(remote_arch)
     end
 
     def remove_context(arch)
       docker :context, :rm, builder_name_with_arch(arch)
     end
-
-    def local
-      config.builder["local"]
-    end
-
-    def remote
-      config.builder["remote"]
-    end
 end

lib/kamal/commands/builder/native.rb

@@ -0,0 +1,20 @@
+class Kamal::Commands::Builder::Native < Kamal::Commands::Builder::Base
+  def create
+    # No-op on native without cache
+  end
+
+  def remove
+    # No-op on native without cache
+  end
+
+  def push
+    combine \
+      docker(:build, *build_options, build_context),
+      docker(:push, config.absolute_image),
+      docker(:push, config.latest_image)
+  end
+
+  def info
+    # No-op on native
+  end
+end

lib/kamal/commands/builder/native/cached.rb

@@ -0,0 +1,16 @@
+class Kamal::Commands::Builder::Native::Cached < Kamal::Commands::Builder::Native
+  def create
+    docker :buildx, :create, "--use", "--driver=docker-container"
+  end
+
+  def remove
+    docker :buildx, :rm, builder_name
+  end
+
+  def push
+    docker :buildx, :build,
+      "--push",
+      *build_options,
+      build_context
+  end
+end

lib/kamal/commands/builder/native/remote.rb

@@ -1,6 +1,4 @@
-require "mrsk/commands/builder/native"
+class Kamal::Commands::Builder::Native::Remote < Kamal::Commands::Builder::Native
-
-class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
   def create
     chain \
       create_context,
@@ -18,10 +16,8 @@ class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
       "--push",
       "--platform", platform,
       "--builder", builder_name,
-      "-t", config.absolute_image,
+      *build_options,
-      *build_args,
+      build_context
-      *build_secrets,
-      "."
   end
 
   def info
@@ -32,29 +28,21 @@ class Mrsk::Commands::Builder::Native::Remote < Mrsk::Commands::Builder::Native
 
 
   private
-    def arch
-      config.builder["remote"]["arch"]
-    end
-
-    def host
-      config.builder["remote"]["host"]
-    end
-
     def builder_name
-      "mrsk-#{config.service}-native-remote"
+      "kamal-#{config.service}-native-remote"
     end
 
     def builder_name_with_arch
-      "#{builder_name}-#{arch}"
+      "#{builder_name}-#{remote_arch}"
     end
 
     def platform
-      "linux/#{arch}"
+      "linux/#{remote_arch}"
     end
 
     def create_context
       docker :context, :create,
-        builder_name_with_arch, "--description", "'#{builder_name} #{arch} native host'", "--docker", "'host=#{host}'"
+        builder_name_with_arch, "--description", "'#{builder_name} #{remote_arch} native host'", "--docker", "'host=#{remote_host}'"
     end
 
     def remove_context

lib/kamal/commands/docker.rb

@@ -0,0 +1,21 @@
+class Kamal::Commands::Docker < Kamal::Commands::Base
+  # Install Docker using the https://github.com/docker/docker-install convenience script.
+  def install
+    pipe [ :curl, "-fsSL", "https://get.docker.com" ], :sh
+  end
+
+  # Checks the Docker client version. Fails if Docker is not installed.
+  def installed?
+    docker "-v"
+  end
+
+  # Checks the Docker server version. Fails if Docker is not running.
+  def running?
+    docker :version
+  end
+
+  # Do we have superuser access to install Docker and start system services?
+  def superuser?
+    [ '[ "${EUID:-$(id -u)}" -eq 0 ]' ]
+  end
+end

lib/kamal/commands/healthcheck.rb

@@ -0,0 +1,60 @@
+class Kamal::Commands::Healthcheck < Kamal::Commands::Base
+
+  def run
+    web = config.role(:web)
+
+    docker :run,
+      "--detach",
+      "--name", container_name_with_version,
+      "--publish", "#{exposed_port}:#{config.healthcheck["port"]}",
+      "--label", "service=#{config.healthcheck_service}",
+      "-e", "KAMAL_CONTAINER_NAME=\"#{config.healthcheck_service}\"",
+      *web.env_args,
+      *web.health_check_args(cord: false),
+      *config.volume_args,
+      *web.option_args,
+      config.absolute_image,
+      web.cmd
+  end
+
+  def status
+    pipe container_id, xargs(docker(:inspect, "--format", DOCKER_HEALTH_STATUS_FORMAT))
+  end
+
+  def container_health_log
+    pipe container_id, xargs(docker(:inspect, "--format", DOCKER_HEALTH_LOG_FORMAT))
+  end
+
+  def logs
+    pipe container_id, xargs(docker(:logs, "--tail", log_lines, "2>&1"))
+  end
+
+  def stop
+    pipe container_id, xargs(docker(:stop))
+  end
+
+  def remove
+    pipe container_id, xargs(docker(:container, :rm))
+  end
+
+  private
+    def container_name_with_version
+      "#{config.healthcheck_service}-#{config.version}"
+    end
+
+    def container_id
+      container_id_for(container_name: container_name_with_version)
+    end
+
+    def health_url
+      "http://localhost:#{exposed_port}#{config.healthcheck["path"]}"
+    end
+
+    def exposed_port
+      config.healthcheck["exposed_port"]
+    end
+
+    def log_lines
+      config.healthcheck["log_lines"]
+    end
+end

lib/kamal/commands/hook.rb

@@ -0,0 +1,14 @@
+class Kamal::Commands::Hook < Kamal::Commands::Base
+  def run(hook, **details)
+    [ hook_file(hook), env: tags(**details).env ]
+  end
+
+  def hook_exists?(hook)
+    Pathname.new(hook_file(hook)).exist?
+  end
+
+  private
+    def hook_file(hook)
+      "#{config.hooks_path}/#{hook}"
+    end
+end

lib/kamal/commands/lock.rb

@@ -0,0 +1,63 @@
+require "active_support/duration"
+require "time"
+
+class Kamal::Commands::Lock < Kamal::Commands::Base
+  def acquire(message, version)
+    combine \
+      [:mkdir, lock_dir],
+      write_lock_details(message, version)
+  end
+
+  def release
+    combine \
+      [:rm, lock_details_file],
+      [:rm, "-r", lock_dir]
+  end
+
+  def status
+    combine \
+      stat_lock_dir,
+      read_lock_details
+  end
+
+  private
+    def write_lock_details(message, version)
+      write \
+        [:echo, "\"#{Base64.encode64(lock_details(message, version))}\""],
+        lock_details_file
+    end
+
+    def read_lock_details
+      pipe \
+        [:cat, lock_details_file],
+        [:base64, "-d"]
+    end
+
+    def stat_lock_dir
+      write \
+        [:stat, lock_dir],
+        "/dev/null"
+    end
+
+    def lock_dir
+      "#{config.run_directory}/lock-#{config.service}"
+    end
+
+    def lock_details_file
+      [lock_dir, :details].join("/")
+    end
+
+    def lock_details(message, version)
+      <<~DETAILS.strip
+        Locked by: #{locked_by} at #{Time.now.utc.iso8601}
+        Version: #{version}
+        Message: #{message}
+      DETAILS
+    end
+
+    def locked_by
+      Kamal::Git.user_name
+    rescue Errno::ENOENT
+      "Unknown"
+    end
+end

lib/kamal/commands/prune.rb

@@ -0,0 +1,46 @@
+require "active_support/duration"
+require "active_support/core_ext/numeric/time"
+
+class Kamal::Commands::Prune < Kamal::Commands::Base
+  def dangling_images
+    docker :image, :prune, "--force", "--filter", "label=service=#{config.service}"
+  end
+
+  def tagged_images
+    pipe \
+      docker(:image, :ls, *service_filter, "--format", "'{{.ID}} {{.Repository}}:{{.Tag}}'"),
+      "grep -v -w \"#{active_image_list}\"",
+      "while read image tag; do docker rmi $tag; done"
+  end
+
+  def app_containers(keep_last: 5)
+    pipe \
+      docker(:ps, "-q", "-a", *service_filter, *stopped_containers_filters),
+      "tail -n +#{keep_last + 1}",
+      "while read container_id; do docker rm $container_id; done"
+  end
+
+  def healthcheck_containers
+    docker :container, :prune, "--force", *healthcheck_service_filter
+  end
+
+  private
+    def stopped_containers_filters
+      [ "created", "exited", "dead" ].flat_map { |status| ["--filter", "status=#{status}"] }
+    end
+
+    def active_image_list
+      # Pull the images that are used by any containers
+      # Append repo:latest - to avoid deleting the latest tag
+      # Append repo:<none> - to avoid deleting dangling images that are in use. Unused dangling images are deleted separately
+      "$(docker container ls -a --format '{{.Image}}\\|' --filter label=service=#{config.service} | tr -d '\\n')#{config.latest_image}\\|#{config.repository}:<none>"
+    end
+
+    def service_filter
+      [ "--filter", "label=service=#{config.service}" ]
+    end
+
+    def healthcheck_service_filter
+      [ "--filter", "label=service=#{config.healthcheck_service}" ]
+    end
+  end

lib/kamal/commands/registry.rb

@@ -0,0 +1,20 @@
+class Kamal::Commands::Registry < Kamal::Commands::Base
+  delegate :registry, to: :config
+
+  def login
+    docker :login, registry["server"], "-u", sensitive(lookup("username")), "-p", sensitive(lookup("password"))
+  end
+
+  def logout
+    docker :logout, registry["server"]
+  end
+
+  private
+    def lookup(key)
+      if registry[key].is_a?(Array)
+        ENV.fetch(registry[key].first).dup
+      else
+        registry[key]
+      end
+    end
+end

lib/kamal/commands/server.rb

@@ -0,0 +1,5 @@
+class Kamal::Commands::Server < Kamal::Commands::Base
+  def ensure_run_directory
+    [:mkdir, "-p", config.run_directory]
+  end
+end

lib/kamal/commands/traefik.rb

@@ -0,0 +1,122 @@
+class Kamal::Commands::Traefik < Kamal::Commands::Base
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  DEFAULT_IMAGE = "traefik:v2.9"
+  CONTAINER_PORT = 80
+  DEFAULT_ARGS = {
+    'log.level' => 'DEBUG'
+  }
+
+  def run
+    docker :run, "--name traefik",
+      "--detach",
+      "--restart", "unless-stopped",
+      *publish_args,
+      "--volume", "/var/run/docker.sock:/var/run/docker.sock",
+      *env_args,
+      *config.logging_args,
+      *label_args,
+      *docker_options_args,
+      image,
+      "--providers.docker",
+      *cmd_option_args
+  end
+
+  def start
+    docker :container, :start, "traefik"
+  end
+
+  def stop
+    docker :container, :stop, "traefik"
+  end
+
+  def start_or_run
+    combine start, run, by: "||"
+  end
+
+  def info
+    docker :ps, "--filter", "name=^traefik$"
+  end
+
+  def logs(since: nil, lines: nil, grep: nil)
+    pipe \
+      docker(:logs, "traefik", (" --since #{since}" if since), (" --tail #{lines}" if lines), "--timestamps", "2>&1"),
+      ("grep '#{grep}'" if grep)
+  end
+
+  def follow_logs(host:, grep: nil)
+    run_over_ssh pipe(
+      docker(:logs, "traefik", "--timestamps", "--tail", "10", "--follow", "2>&1"),
+      (%(grep "#{grep}") if grep)
+    ).join(" "), host: host
+  end
+
+  def remove_container
+    docker :container, :prune, "--force", "--filter", "label=org.opencontainers.image.title=Traefik"
+  end
+
+  def remove_image
+    docker :image, :prune, "--all", "--force", "--filter", "label=org.opencontainers.image.title=Traefik"
+  end
+
+  def port
+    "#{host_port}:#{CONTAINER_PORT}"
+  end
+
+  def env_file
+    Kamal::EnvFile.new(config.traefik.fetch("env", {}))
+  end
+
+  def host_env_file_path
+    File.join host_env_directory, "traefik.env"
+  end
+
+  def make_env_directory
+    make_directory(host_env_directory)
+  end
+
+  def remove_env_file
+    [:rm, "-f", host_env_file_path]
+  end
+
+  private
+    def publish_args
+      argumentize "--publish", port unless config.traefik["publish"] == false
+    end
+
+    def label_args
+      argumentize "--label", labels
+    end
+
+    def env_args
+      argumentize "--env-file", host_env_file_path
+    end
+
+    def host_env_directory
+      File.join config.host_env_directory, "traefik"
+    end
+
+    def labels
+      config.traefik["labels"] || []
+    end
+
+    def image
+      config.traefik.fetch("image") { DEFAULT_IMAGE }
+    end
+
+    def docker_options_args
+      optionize(config.traefik["options"] || {})
+    end
+
+    def cmd_option_args
+      if args = config.traefik["args"]
+        optionize DEFAULT_ARGS.merge(args), with: "="
+      else
+        optionize DEFAULT_ARGS, with: "="
+      end
+    end
+
+    def host_port
+      config.traefik["host_port"] || CONTAINER_PORT
+    end
+end

lib/kamal/configuration.rb

@@ -0,0 +1,287 @@
+require "active_support/ordered_options"
+require "active_support/core_ext/string/inquiry"
+require "active_support/core_ext/module/delegation"
+require "pathname"
+require "erb"
+require "net/ssh/proxy/jump"
+
+class Kamal::Configuration
+  delegate :service, :image, :servers, :env, :labels, :registry, :stop_wait_time, :hooks_path, to: :raw_config, allow_nil: true
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  attr_reader :destination, :raw_config
+
+  class << self
+    def create_from(config_file:, destination: nil, version: nil)
+      raw_config = load_config_files(config_file, *destination_config_file(config_file, destination))
+
+      new raw_config, destination: destination, version: version
+    end
+
+    private
+      def load_config_files(*files)
+        files.inject({}) { |config, file| config.deep_merge! load_config_file(file) }
+      end
+
+      def load_config_file(file)
+        if file.exist?
+          YAML.load(ERB.new(IO.read(file)).result).symbolize_keys
+        else
+          raise "Configuration file not found in #{file}"
+        end
+      end
+
+      def destination_config_file(base_config_file, destination)
+        base_config_file.sub_ext(".#{destination}.yml") if destination
+      end
+  end
+
+  def initialize(raw_config, destination: nil, version: nil, validate: true)
+    @raw_config = ActiveSupport::InheritableOptions.new(raw_config)
+    @destination = destination
+    @declared_version = version
+    valid? if validate
+  end
+
+
+  def version=(version)
+    @declared_version = version
+  end
+
+  def version
+    @declared_version.presence || ENV["VERSION"] || git_version
+  end
+
+  def abbreviated_version
+    if version
+      # Don't abbreviate <sha>_uncommitted_<etc>
+      if version.include?("_")
+        version
+      else
+        version[0...7]
+      end
+    end
+  end
+
+  def minimum_version
+    raw_config.minimum_version
+  end
+
+
+  def roles
+    @roles ||= role_names.collect { |role_name| Role.new(role_name, config: self) }
+  end
+
+  def role(name)
+    roles.detect { |r| r.name == name.to_s }
+  end
+
+  def accessories
+    @accessories ||= raw_config.accessories&.keys&.collect { |name| Kamal::Configuration::Accessory.new(name, config: self) } || []
+  end
+
+  def accessory(name)
+    accessories.detect { |a| a.name == name.to_s }
+  end
+
+
+  def all_hosts
+    roles.flat_map(&:hosts).uniq
+  end
+
+  def primary_web_host
+    role(:web).primary_host
+  end
+
+  def traefik_hosts
+    roles.select(&:running_traefik?).flat_map(&:hosts).uniq
+  end
+
+
+  def repository
+    [ raw_config.registry["server"], image ].compact.join("/")
+  end
+
+  def absolute_image
+    "#{repository}:#{version}"
+  end
+
+  def latest_image
+    "#{repository}:latest"
+  end
+
+  def service_with_version
+    "#{service}-#{version}"
+  end
+
+  def require_destination?
+    raw_config.require_destination
+  end
+
+
+  def volume_args
+    if raw_config.volumes.present?
+      argumentize "--volume", raw_config.volumes
+    else
+      []
+    end
+  end
+
+  def logging_args
+    if raw_config.logging.present?
+      optionize({ "log-driver" => raw_config.logging["driver"] }.compact) +
+        argumentize("--log-opt", raw_config.logging["options"])
+    else
+      argumentize("--log-opt", { "max-size" => "10m" })
+    end
+  end
+
+
+  def boot
+    Kamal::Configuration::Boot.new(config: self)
+  end
+
+  def builder
+    Kamal::Configuration::Builder.new(config: self)
+  end
+
+  def traefik
+    raw_config.traefik || {}
+  end
+
+  def ssh
+    Kamal::Configuration::Ssh.new(config: self)
+  end
+
+  def sshkit
+    Kamal::Configuration::Sshkit.new(config: self)
+  end
+
+
+  def healthcheck
+    { "path" => "/up", "port" => 3000, "max_attempts" => 7, "exposed_port" => 3999, "cord" => "/tmp/kamal-cord", "log_lines" => 50 }.merge(raw_config.healthcheck || {})
+  end
+
+  def healthcheck_service
+    [ "healthcheck", service, destination ].compact.join("-")
+  end
+
+  def readiness_delay
+    raw_config.readiness_delay || 7
+  end
+
+  def run_id
+    @run_id ||= SecureRandom.hex(16)
+  end
+
+
+  def run_directory
+    raw_config.run_directory || ".kamal"
+  end
+
+  def run_directory_as_docker_volume
+    if Pathname.new(run_directory).absolute?
+      run_directory
+    else
+      File.join "$(pwd)", run_directory
+    end
+  end
+
+  def hooks_path
+    raw_config.hooks_path || ".kamal/hooks"
+  end
+
+  def host_env_directory
+    "#{run_directory}/env"
+  end
+
+  def asset_path
+    raw_config.asset_path
+  end
+
+
+  def valid?
+    ensure_destination_if_required && ensure_required_keys_present && ensure_valid_kamal_version
+  end
+
+  # Will raise KeyError if any secret ENVs are missing
+  def ensure_env_available
+    roles.collect(&:env_file).each(&:to_s)
+
+    true
+  end
+
+  def to_h
+    {
+      roles: role_names,
+      hosts: all_hosts,
+      primary_host: primary_web_host,
+      version: version,
+      repository: repository,
+      absolute_image: absolute_image,
+      service_with_version: service_with_version,
+      volume_args: volume_args,
+      ssh_options: ssh.to_h,
+      sshkit: sshkit.to_h,
+      builder: builder.to_h,
+      accessories: raw_config.accessories,
+      logging: logging_args,
+      healthcheck: healthcheck
+    }.compact
+  end
+
+
+  private
+    # Will raise ArgumentError if any required config keys are missing
+    def ensure_destination_if_required
+      if require_destination? && destination.nil?
+        raise ArgumentError, "You must specify a destination"
+      end
+
+      true
+    end
+
+    def ensure_required_keys_present
+      %i[ service image registry servers ].each do |key|
+        raise ArgumentError, "Missing required configuration for #{key}" unless raw_config[key].present?
+      end
+
+      if raw_config.registry["username"].blank?
+        raise ArgumentError, "You must specify a username for the registry in config/deploy.yml"
+      end
+
+      if raw_config.registry["password"].blank?
+        raise ArgumentError, "You must specify a password for the registry in config/deploy.yml (or set the ENV variable if that's used)"
+      end
+
+      roles.each do |role|
+        if role.hosts.empty?
+          raise ArgumentError, "No servers specified for the #{role.name} role"
+        end
+      end
+
+      true
+    end
+
+    def ensure_valid_kamal_version
+      if minimum_version && Gem::Version.new(minimum_version) > Gem::Version.new(Kamal::VERSION)
+        raise ArgumentError, "Current version is #{Kamal::VERSION}, minimum required is #{minimum_version}"
+      end
+
+      true
+    end
+
+
+    def role_names
+      raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort
+    end
+
+    def git_version
+      @git_version ||=
+        if Kamal::Git.used?
+          [ Kamal::Git.revision, Kamal::Git.uncommitted_changes.present? ? "_uncommitted_#{SecureRandom.hex(8)}" : "" ].join
+        else
+          raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
+        end
+    end
+end

lib/kamal/configuration/accessory.rb

@@ -1,5 +1,5 @@
-class Mrsk::Configuration::Assessory
+class Kamal::Configuration::Accessory
-  delegate :argumentize, :argumentize_env_with_secrets, to: Mrsk::Utils
+  delegate :argumentize, :optionize, to: Kamal::Utils
 
   attr_accessor :name, :specifics
 
@@ -15,18 +15,24 @@ class Mrsk::Configuration::Assessory
     specifics["image"]
   end
 
-  def host
+  def hosts
-    specifics["host"] || raise(ArgumentError, "Missing host for accessory")
+    if (specifics.keys & ["host", "hosts", "roles"]).size != 1
+      raise ArgumentError, "Specify one of `host`, `hosts` or `roles` for accessory `#{name}`"
+    end
+
+    hosts_from_host || hosts_from_hosts || hosts_from_roles
   end
 
   def port
-    if specifics["port"].to_s.include?(":")
+    if port = specifics["port"]&.to_s
-      specifics["port"]
+      port.include?(":") ? port : "#{port}:#{port}"
-    else
-      "#{specifics["port"]}:#{specifics["port"]}"
     end
   end
 
+  def publish_args
+    argumentize "--publish", port if port
+  end
+
   def labels
     default_labels.merge(specifics["labels"] || {})
   end
@@ -39,8 +45,20 @@ class Mrsk::Configuration::Assessory
     specifics["env"] || {}
   end
 
+  def env_file
+    Kamal::EnvFile.new(env)
+  end
+
+  def host_env_directory
+    File.join config.host_env_directory, "accessories"
+  end
+
+  def host_env_file_path
+    File.join host_env_directory, "#{service_name}.env"
+  end
+
   def env_args
-    argumentize_env_with_secrets env
+    argumentize "--env-file", host_env_file_path
   end
 
   def files
@@ -65,6 +83,18 @@ class Mrsk::Configuration::Assessory
     argumentize "--volume", volumes
   end
 
+  def option_args
+    if args = specifics["options"]
+      optionize args
+    else
+      []
+    end
+  end
+
+  def cmd
+    specifics["cmd"]
+  end
+
   private
     attr_accessor :config
 
@@ -120,4 +150,32 @@ class Mrsk::Configuration::Assessory
     def service_data_directory
       "$PWD/#{service_name}"
     end
+
+    def hosts_from_host
+      if specifics.key?("host")
+        host = specifics["host"]
+        if host
+          [host]
+        else
+          raise ArgumentError, "Missing host for accessory `#{name}`"
+        end
+      end
+    end
+
+    def hosts_from_hosts
+      if specifics.key?("hosts")
+        hosts = specifics["hosts"]
+        if hosts.is_a?(Array)
+          hosts
+        else
+          raise ArgumentError, "Hosts should be an Array for accessory `#{name}`"
+        end
+      end
+    end
+
+    def hosts_from_roles
+      if specifics.key?("roles")
+        specifics["roles"].flat_map { |role| config.role(role).hosts }
+      end
+    end
 end

lib/kamal/configuration/boot.rb

@@ -0,0 +1,20 @@
+class Kamal::Configuration::Boot
+  def initialize(config:)
+    @options = config.raw_config.boot || {}
+    @host_count = config.all_hosts.count
+  end
+
+  def limit
+    limit = @options["limit"]
+
+    if limit.to_s.end_with?("%")
+      @host_count * limit.to_i / 100
+    else
+      limit
+    end
+  end
+
+  def wait
+    @options["wait"]
+  end
+end

lib/kamal/configuration/builder.rb

@@ -0,0 +1,114 @@
+class Kamal::Configuration::Builder
+  def initialize(config:)
+    @options = config.raw_config.builder || {}
+    @image = config.image
+    @server = config.registry["server"]
+
+    valid?
+  end
+
+  def to_h
+    @options
+  end
+
+  def multiarch?
+    @options["multiarch"] != false
+  end
+
+  def local?
+    !!@options["local"]
+  end
+
+  def remote?
+    !!@options["remote"]
+  end
+
+  def cached?
+    !!@options["cache"]
+  end
+
+  def args
+    @options["args"] || {}
+  end
+
+  def secrets
+    @options["secrets"] || []
+  end
+
+  def dockerfile
+    @options["dockerfile"] || "Dockerfile"
+  end
+
+  def context
+    @options["context"] || "."
+  end
+
+  def local_arch
+    @options["local"]["arch"] if local?
+  end
+
+  def local_host
+    @options["local"]["host"] if local?
+  end
+
+  def remote_arch
+    @options["remote"]["arch"] if remote?
+  end
+
+  def remote_host
+    @options["remote"]["host"] if remote?
+  end
+
+  def cache_from
+    if cached?
+      case @options["cache"]["type"]
+      when "gha"
+        cache_from_config_for_gha
+      when "registry"
+        cache_from_config_for_registry
+      end
+    end
+  end
+
+  def cache_to
+    if cached?
+      case @options["cache"]["type"]
+      when "gha"
+        cache_to_config_for_gha
+      when "registry"
+        cache_to_config_for_registry
+      end
+    end
+  end
+
+  private
+    def valid?
+      if @options["cache"] && @options["cache"]["type"]
+        raise ArgumentError, "Invalid cache type: #{@options["cache"]["type"]}" unless ["gha", "registry"].include?(@options["cache"]["type"])
+      end
+    end
+
+    def cache_image
+      @options["cache"]&.fetch("image", nil) || "#{@image}-build-cache"
+    end
+
+    def cache_image_ref
+      [ @server, cache_image ].compact.join("/")
+    end
+
+    def cache_from_config_for_gha
+      "type=gha"
+    end
+
+    def cache_from_config_for_registry
+      [ "type=registry", "ref=#{cache_image_ref}" ].compact.join(",")
+    end
+
+    def cache_to_config_for_gha
+      [ "type=gha", @options["cache"]&.fetch("options", nil)].compact.join(",")
+    end
+
+    def cache_to_config_for_registry
+      [ "type=registry", @options["cache"]&.fetch("options", nil), "ref=#{cache_image_ref}" ].compact.join(",")
+    end
+end

lib/kamal/configuration/role.rb

@@ -0,0 +1,248 @@
+class Kamal::Configuration::Role
+  CORD_FILE = "cord"
+  delegate :argumentize, :optionize, to: Kamal::Utils
+
+  attr_accessor :name
+
+  def initialize(name, config:)
+   @name, @config = name.inquiry, config
+  end
+
+  def primary_host
+    hosts.first
+  end
+
+  def hosts
+    @hosts ||= extract_hosts_from_config
+  end
+
+  def cmd
+    specializations["cmd"]
+  end
+
+  def option_args
+    if args = specializations["options"]
+      optionize args
+    else
+      []
+    end
+  end
+
+  def labels
+    default_labels.merge(traefik_labels).merge(custom_labels)
+  end
+
+  def label_args
+    argumentize "--label", labels
+  end
+
+
+  def env
+    if config.env && config.env["secret"]
+      merged_env_with_secrets
+    else
+      merged_env
+    end
+  end
+
+  def env_file
+    Kamal::EnvFile.new(env)
+  end
+
+  def host_env_directory
+    File.join config.host_env_directory, "roles"
+  end
+
+  def host_env_file_path
+    File.join host_env_directory, "#{[config.service, name, config.destination].compact.join("-")}.env"
+  end
+
+  def env_args
+    argumentize "--env-file", host_env_file_path
+  end
+
+  def asset_volume_args
+    asset_volume&.docker_args
+  end
+
+
+  def health_check_args(cord: true)
+    if health_check_cmd.present?
+      if cord && uses_cord?
+        optionize({ "health-cmd" => health_check_cmd_with_cord, "health-interval" => health_check_interval })
+          .concat(cord_volume.docker_args)
+      else
+        optionize({ "health-cmd" => health_check_cmd, "health-interval" => health_check_interval })
+      end
+    else
+      []
+    end
+  end
+
+  def health_check_cmd
+    health_check_options["cmd"] || http_health_check(port: health_check_options["port"], path: health_check_options["path"])
+  end
+
+  def health_check_cmd_with_cord
+    "(#{health_check_cmd}) && (stat #{cord_container_file} > /dev/null || exit 1)"
+  end
+
+  def health_check_interval
+    health_check_options["interval"] || "1s"
+  end
+
+
+  def running_traefik?
+    name.web? || specializations["traefik"]
+  end
+
+
+  def uses_cord?
+    running_traefik? && cord_volume && health_check_cmd.present?
+  end
+
+  def cord_host_directory
+    File.join config.run_directory_as_docker_volume, "cords", [container_prefix, config.run_id].join("-")
+  end
+
+  def cord_volume
+    if (cord = health_check_options["cord"])
+      @cord_volume ||= Kamal::Configuration::Volume.new \
+        host_path: File.join(config.run_directory, "cords", [container_prefix, config.run_id].join("-")),
+        container_path: cord
+    end
+  end
+
+  def cord_host_file
+    File.join cord_volume.host_path, CORD_FILE
+  end
+
+  def cord_container_directory
+    health_check_options.fetch("cord", nil)
+  end
+
+  def cord_container_file
+    File.join cord_volume.container_path, CORD_FILE
+  end
+
+
+  def container_name(version = nil)
+    [ container_prefix, version || config.version ].compact.join("-")
+  end
+
+  def container_prefix
+    [ config.service, name, config.destination ].compact.join("-")
+  end
+
+
+  def asset_path
+    specializations["asset_path"] || config.asset_path
+  end
+
+  def assets?
+    asset_path.present? && running_traefik?
+  end
+
+  def asset_volume(version = nil)
+    if assets?
+      Kamal::Configuration::Volume.new \
+        host_path: asset_volume_path(version), container_path: asset_path
+    end
+  end
+
+  def asset_extracted_path(version = nil)
+    File.join config.run_directory, "assets", "extracted", container_name(version)
+  end
+
+  def asset_volume_path(version = nil)
+    File.join config.run_directory, "assets", "volumes", container_name(version)
+  end
+
+  private
+    attr_accessor :config
+
+    def extract_hosts_from_config
+      if config.servers.is_a?(Array)
+        config.servers
+      else
+        servers = config.servers[name]
+        servers.is_a?(Array) ? servers : Array(servers["hosts"])
+      end
+    end
+
+    def default_labels
+      if config.destination
+        { "service" => config.service, "role" => name, "destination" => config.destination }
+      else
+        { "service" => config.service, "role" => name }
+      end
+    end
+
+    def traefik_labels
+      if running_traefik?
+        {
+          # Setting a service property ensures that the generated service name will be consistent between versions
+          "traefik.http.services.#{traefik_service}.loadbalancer.server.scheme" => "http",
+
+          "traefik.http.routers.#{traefik_service}.rule" => "PathPrefix(`/`)",
+          "traefik.http.middlewares.#{traefik_service}-retry.retry.attempts" => "5",
+          "traefik.http.middlewares.#{traefik_service}-retry.retry.initialinterval" => "500ms",
+          "traefik.http.routers.#{traefik_service}.middlewares" => "#{traefik_service}-retry@docker"
+        }
+      else
+        {}
+      end
+    end
+
+    def traefik_service
+      [ config.service, name, config.destination ].compact.join("-")
+    end
+
+    def custom_labels
+      Hash.new.tap do |labels|
+        labels.merge!(config.labels) if config.labels.present?
+        labels.merge!(specializations["labels"]) if specializations["labels"].present?
+      end
+    end
+
+    def specializations
+      if config.servers.is_a?(Array) || config.servers[name].is_a?(Array)
+        { }
+      else
+        config.servers[name].except("hosts")
+      end
+    end
+
+    def specialized_env
+      specializations["env"] || {}
+    end
+
+    def merged_env
+      config.env&.merge(specialized_env) || {}
+    end
+
+    # Secrets are stored in an array, which won't merge by default, so have to do it by hand.
+    def merged_env_with_secrets
+      merged_env.tap do |new_env|
+        new_env["secret"] = Array(config.env["secret"]) + Array(specialized_env["secret"])
+
+        # If there's no secret/clear split, everything is clear
+        clear_app_env  = config.env["secret"] ? Array(config.env["clear"]) : Array(config.env["clear"] || config.env)
+        clear_role_env = specialized_env["secret"] ? Array(specialized_env["clear"]) : Array(specialized_env["clear"] || specialized_env)
+
+        new_env["clear"] = (clear_app_env + clear_role_env).uniq
+      end
+    end
+
+    def http_health_check(port:, path:)
+      "curl -f #{URI.join("http://localhost:#{port}", path)} || exit 1" if path.present? || port.present?
+    end
+
+    def health_check_options
+      @health_check_options ||= begin
+        options = specializations["healthcheck"] || {}
+        options = config.healthcheck.merge(options) if running_traefik?
+        options
+      end
+    end
+end

lib/kamal/configuration/ssh.rb

@@ -0,0 +1,38 @@
+class Kamal::Configuration::Ssh
+  LOGGER = ::Logger.new(STDERR)
+
+  def initialize(config:)
+    @config = config.raw_config.ssh || {}
+  end
+
+  def user
+    config.fetch("user", "root")
+  end
+
+  def proxy
+    if (proxy = config["proxy"])
+      Net::SSH::Proxy::Jump.new(proxy.include?("@") ? proxy : "root@#{proxy}")
+    elsif (proxy_command = config["proxy_command"])
+      Net::SSH::Proxy::Command.new(proxy_command)
+    end
+  end
+
+  def options
+    { user: user, proxy: proxy, logger: logger, keepalive: true, keepalive_interval: 30 }.compact
+  end
+
+  def to_h
+    options.except(:logger).merge(log_level: log_level)
+  end
+
+  private
+    attr_accessor :config
+
+    def logger
+      LOGGER.tap { |logger| logger.level = log_level }
+    end
+
+    def log_level
+      config.fetch("log_level", :fatal)
+    end
+end

lib/kamal/configuration/sshkit.rb

@@ -0,0 +1,20 @@
+class Kamal::Configuration::Sshkit
+  def initialize(config:)
+    @options = config.raw_config.sshkit || {}
+  end
+
+  def max_concurrent_starts
+    options.fetch("max_concurrent_starts", 30)
+  end
+
+  def pool_idle_timeout
+    options.fetch("pool_idle_timeout", 900)
+  end
+
+  def to_h
+    options
+  end
+
+  private
+    attr_accessor :options
+end

lib/kamal/configuration/volume.rb

@@ -0,0 +1,22 @@
+class Kamal::Configuration::Volume
+  attr_reader :host_path, :container_path
+  delegate :argumentize, to: Kamal::Utils
+
+  def initialize(host_path:, container_path:)
+    @host_path = host_path
+    @container_path = container_path
+  end
+
+  def docker_args
+    argumentize "--volume", "#{host_path_for_docker_volume}:#{container_path}"
+  end
+
+  private
+    def host_path_for_docker_volume
+      if Pathname.new(host_path).absolute?
+        host_path
+      else
+        File.join "$(pwd)", host_path
+      end
+    end
+end

lib/kamal/env_file.rb

@@ -0,0 +1,41 @@
+# Encode an env hash as a string where secret values have been looked up and all values escaped for Docker.
+class Kamal::EnvFile
+  def initialize(env)
+    @env = env
+  end
+  
+  def to_s
+    env_file = StringIO.new.tap do |contents|
+      if (secrets = @env["secret"]).present?
+        @env.fetch("secret", @env)&.each do |key|
+          contents << docker_env_file_line(key, ENV.fetch(key))
+        end
+
+        @env["clear"]&.each do |key, value|
+          contents << docker_env_file_line(key, value)
+        end
+      else
+        @env.fetch("clear", @env)&.each do |key, value|
+          contents << docker_env_file_line(key, value)
+        end
+      end
+    end.string
+
+    # Ensure the file has some contents to avoid the SSHKIT empty file warning
+    env_file.presence || "\n"
+  end
+
+  alias to_str to_s
+  
+  private
+    def docker_env_file_line(key, value)
+      "#{key.to_s}=#{escape_docker_env_file_value(value)}\n"
+    end
+
+    # Escape a value to make it safe to dump in a docker file.
+    def escape_docker_env_file_value(value)
+      # Doublequotes are treated literally in docker env files
+      # so remove leading and trailing ones and unescape any others
+      value.to_s.dump[1..-2].gsub(/\\"/, "\"")
+    end
+end

lib/kamal/git.rb

@@ -0,0 +1,19 @@
+module Kamal::Git
+  extend self
+
+  def used?
+    system("git rev-parse")
+  end
+
+  def user_name
+    `git config user.name`.strip
+  end
+
+  def revision
+    `git rev-parse HEAD`.strip
+  end
+
+  def uncommitted_changes
+    `git status --porcelain`.strip
+  end
+end

lib/kamal/sshkit_with_ext.rb

@@ -0,0 +1,104 @@
+require "sshkit"
+require "sshkit/dsl"
+require "active_support/core_ext/hash/deep_merge"
+require "json"
+
+class SSHKit::Backend::Abstract
+  def capture_with_info(*args, **kwargs)
+    capture(*args, **kwargs, verbosity: Logger::INFO)
+  end
+
+  def capture_with_debug(*args, **kwargs)
+    capture(*args, **kwargs, verbosity: Logger::DEBUG)
+  end
+
+  def capture_with_pretty_json(*args, **kwargs)
+    JSON.pretty_generate(JSON.parse(capture(*args, **kwargs)))
+  end
+
+  def puts_by_host(host, output, type: "App")
+    puts "#{type} Host: #{host}\n#{output}\n\n"
+  end
+
+  # Our execution pattern is for the CLI execute args lists returned
+  # from commands, but this doesn't support returning execution options
+  # from the command.
+  #
+  # Support this by using kwargs for CLI options and merging with the
+  # args-extracted options.
+  module CommandEnvMerge
+    private
+
+    # Override to merge options returned by commands in the args list with
+    # options passed by the CLI and pass them along as kwargs.
+    def command(args, options)
+      more_options, args = args.partition { |a| a.is_a? Hash }
+      more_options << options
+
+      build_command(args, **more_options.reduce(:deep_merge))
+    end
+
+    # Destructure options to pluck out env for merge
+    def build_command(args, env: nil, **options)
+      # Rely on native Ruby kwargs precedence rather than explicit Hash merges
+      SSHKit::Command.new(*args, **default_command_options, **options, env: env_for(env))
+    end
+
+    def default_command_options
+      { in: pwd_path, host: @host, user: @user, group: @group }
+    end
+
+    def env_for(env)
+      @env.to_h.merge(env.to_h)
+    end
+  end
+  prepend CommandEnvMerge
+end
+
+class SSHKit::Backend::Netssh::Configuration
+  attr_accessor :max_concurrent_starts
+end
+
+class SSHKit::Backend::Netssh
+  module LimitConcurrentStartsClass
+    attr_reader :start_semaphore
+
+    def configure(&block)
+      super &block
+      # Create this here to avoid lazy creation by multiple threads
+      if config.max_concurrent_starts
+        @start_semaphore = Concurrent::Semaphore.new(config.max_concurrent_starts)
+      end
+    end
+  end
+
+  class << self
+    prepend LimitConcurrentStartsClass
+  end
+
+  module LimitConcurrentStartsInstance
+    private
+      def with_ssh(&block)
+        host.ssh_options = self.class.config.ssh_options.merge(host.ssh_options || {})
+        self.class.pool.with(
+          method(:start_with_concurrency_limit),
+          String(host.hostname),
+          host.username,
+          host.netssh_options,
+          &block
+        )
+      end
+
+      def start_with_concurrency_limit(*args)
+        if self.class.start_semaphore
+          self.class.start_semaphore.acquire do
+            Net::SSH.start(*args)
+          end
+        else
+          Net::SSH.start(*args)
+        end
+      end
+  end
+
+  prepend LimitConcurrentStartsInstance
+end

lib/kamal/tags.rb

@@ -0,0 +1,39 @@
+require "time"
+
+class Kamal::Tags
+  attr_reader :config, :tags
+
+  class << self
+    def from_config(config, **extra)
+      new(**default_tags(config), **extra)
+    end
+
+    def default_tags(config)
+      { recorded_at: Time.now.utc.iso8601,
+        performer: `whoami`.chomp,
+        destination: config.destination,
+        version: config.version,
+        service_version: service_version(config) }
+    end
+
+    def service_version(config)
+      [ config.service, config.abbreviated_version ].compact.join("@")
+    end
+  end
+
+  def initialize(**tags)
+    @tags = tags.compact
+  end
+
+  def env
+    tags.transform_keys { |detail| "KAMAL_#{detail.upcase}" }
+  end
+
+  def to_s
+    tags.values.map { |value| "[#{value}]" }.join(" ")
+  end
+
+  def except(*tags)
+    self.class.new(**self.tags.except(*tags))
+  end
+end

lib/kamal/utils.rb

@@ -0,0 +1,61 @@
+module Kamal::Utils
+  extend self
+
+  DOLLAR_SIGN_WITHOUT_SHELL_EXPANSION_REGEX = /\$(?!{[^\}]*\})/
+
+  # Return a list of escaped shell arguments using the same named argument against the passed attributes (hash or array).
+  def argumentize(argument, attributes, sensitive: false)
+    Array(attributes).flat_map do |key, value|
+      if value.present?
+        attr = "#{key}=#{escape_shell_value(value)}"
+        attr = self.sensitive(attr, redaction: "#{key}=[REDACTED]") if sensitive
+        [ argument, attr]
+      else
+        [ argument, key ]
+      end
+    end
+  end
+
+  # Returns a list of shell-dashed option arguments. If the value is true, it's treated like a value-less option.
+  def optionize(args, with: nil)
+    options = if with
+      flatten_args(args).collect { |(key, value)| value == true ? "--#{key}" : "--#{key}#{with}#{escape_shell_value(value)}" }
+    else
+      flatten_args(args).collect { |(key, value)| [ "--#{key}", value == true ? nil : escape_shell_value(value) ] }
+    end
+
+    options.flatten.compact
+  end
+
+  # Flattens a one-to-many structure into an array of two-element arrays each containing a key-value pair
+  def flatten_args(args)
+    args.flat_map { |key, value| value.try(:map) { |entry| [key, entry] } || [ [ key, value ] ] }
+  end
+
+  # Marks sensitive values for redaction in logs and human-visible output.
+  # Pass `redaction:` to change the default `"[REDACTED]"` redaction, e.g.
+  # `sensitive "#{arg}=#{secret}", redaction: "#{arg}=xxxx"
+  def sensitive(...)
+    Kamal::Utils::Sensitive.new(...)
+  end
+
+  def redacted(value)
+    case
+    when value.respond_to?(:redaction)
+      value.redaction
+    when value.respond_to?(:transform_values)
+      value.transform_values { |value| redacted value }
+    when value.respond_to?(:map)
+      value.map { |element| redacted element }
+    else
+      value
+    end
+  end
+
+  # Escape a value to make it safe for shell use.
+  def escape_shell_value(value)
+    value.to_s.dump
+      .gsub(/`/, '\\\\`')
+      .gsub(DOLLAR_SIGN_WITHOUT_SHELL_EXPANSION_REGEX, '\$')
+  end
+end

lib/kamal/utils/sensitive.rb

@@ -0,0 +1,19 @@
+require "active_support/core_ext/module/delegation"
+
+class Kamal::Utils::Sensitive
+  # So SSHKit knows to redact these values.
+  include SSHKit::Redaction
+
+  attr_reader :unredacted, :redaction
+  delegate :to_s, to: :unredacted
+  delegate :inspect, to: :redaction
+
+  def initialize(value, redaction: "[REDACTED]")
+    @unredacted, @redaction = value, redaction
+  end
+
+  # Sensitive values won't leak into YAML output.
+  def encode_with(coder)
+    coder.represent_scalar nil, redaction
+  end
+end

lib/kamal/version.rb

@@ -0,0 +1,3 @@
+module Kamal
+  VERSION = "1.0.0"
+end

lib/mrsk.rb

@@ -1,5 +0,0 @@
-module Mrsk
-end
-
-require "mrsk/version"
-require "mrsk/commander"

lib/mrsk/cli.rb

@@ -1,9 +0,0 @@
-require "mrsk"
-
-module Mrsk::Cli
-end
-
-# SSHKit uses instance eval, so we need a global const for ergonomics
-MRSK = Mrsk::Commander.new
-
-require "mrsk/cli/main"

lib/mrsk/cli/accessory.rb

@@ -1,199 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Accessory < Mrsk::Cli::Base
-  desc "boot [NAME]", "Boot accessory service on host (use NAME=all to boot all accessories)"
-  def boot(name)
-    if name == "all"
-      MRSK.accessory_names.each { |accessory_name| boot(accessory_name) }
-    else
-      with_accessory(name) do |accessory|
-        directories(name)
-        upload(name)
-        on(accessory.host) { execute *accessory.run }
-      end
-    end
-  end
-
-  desc "upload [NAME]", "Upload accessory files to host"
-  def upload(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) do
-        accessory.files.each do |(local, remote)|
-          accessory.ensure_local_file_present(local)
-
-          execute *accessory.make_directory_for(remote)
-          upload! local, remote
-          execute :chmod, "755", remote
-        end
-      end
-    end
-  end
-
-  desc "directories [NAME]", "Create accessory directories on host"
-  def directories(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) do
-        accessory.directories.keys.each do |host_path|
-          execute *accessory.make_directory(host_path)
-        end
-      end
-    end
-  end
-
-  desc "reboot [NAME]", "Reboot accessory on host (stop container, remove container, start new container)"
-  def reboot(name)
-    with_accessory(name) do |accessory|
-      stop(name)
-      remove_container(name)
-      boot(name)
-    end
-  end
-
-  desc "start [NAME]", "Start existing accessory on host"
-  def start(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) { execute *accessory.start }
-    end
-  end
-
-  desc "stop [NAME]", "Stop accessory on host"
-  def stop(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) { execute *accessory.stop, raise_on_non_zero_exit: false }
-    end
-  end
-
-  desc "restart [NAME]", "Restart accessory on host"
-  def restart(name)
-    with_accessory(name) do
-      stop(name)
-      start(name)
-    end
-  end
-
-  desc "details [NAME]", "Display details about accessory on host (use NAME=all to boot all accessories)"
-  def details(name)
-    if name == "all"
-      MRSK.accessory_names.each { |accessory_name| details(accessory_name) }
-    else
-      with_accessory(name) do |accessory|
-        on(accessory.host) { puts capture_with_info(*accessory.info) }
-      end
-    end
-  end
-
-  desc "exec [NAME] [CMD]", "Execute a custom command on accessory host"
-  option :method, aliases: "-m", default: "exec", desc: "Execution method: [exec] perform inside container / [run] perform in new container / [ssh] perform over ssh"
-  def exec(name, cmd)
-    runner = \
-      case options[:method]
-      when "exec"     then "exec"
-      when "run"      then "run_exec"
-      when "ssh_exec" then "exec_over_ssh"
-      when "ssh_run"  then "run_over_ssh"
-      else raise "Unknown method: #{options[:method]}"
-      end.inquiry
-
-    with_accessory(name) do |accessory|
-      if runner.exec_over_ssh? || runner.run_over_ssh?
-        run_locally do
-          info "Launching command on #{accessory.host}"
-          exec accessory.send(runner, cmd)
-        end
-      else
-        on(accessory.host) do
-          info "Launching command on #{accessory.host}"
-          execute *accessory.send(runner, cmd)
-        end
-      end
-    end
-  end
-
-  desc "bash [NAME]", "Start a bash session on primary host (or specific host set by --hosts)"
-  def bash(name)
-    with_accessory(name) do |accessory|
-      run_locally do
-        info "Launching bash session on #{accessory.host}"
-        exec accessory.bash
-      end
-    end
-  end
-
-  desc "logs [NAME]", "Show log lines from accessory on host"
-  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
-  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
-  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
-  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
-  def logs(name)
-    with_accessory(name) do |accessory|
-      grep = options[:grep]
-
-      if options[:follow]
-        run_locally do
-          info "Following logs on #{accessory.host}..."
-          info accessory.follow_logs(grep: grep)
-          exec accessory.follow_logs(grep: grep)
-        end
-      else
-        since = options[:since]
-        lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
-
-        on(accessory.host) do
-          puts capture_with_info(*accessory.logs(since: since, lines: lines, grep: grep))
-        end
-      end
-    end
-  end
-
-  desc "remove [NAME]", "Remove accessory container and image from host (use NAME=all to boot all accessories)"
-  def remove(name)
-    if name == "all"
-      MRSK.accessory_names.each { |accessory_name| remove(accessory_name) }
-    else
-      with_accessory(name) do
-        stop(name)
-        remove_container(name)
-        remove_image(name)
-        remove_service_directory(name)
-      end
-    end
-  end
-
-  desc "remove_container [NAME]", "Remove accessory container from host"
-  def remove_container(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) { execute *accessory.remove_container }
-    end
-  end
-
-  desc "remove_container [NAME]", "Remove accessory image from host"
-  def remove_image(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) { execute *accessory.remove_image }
-    end
-  end
-
-  desc "remove_service_directory [NAME]", "Remove accessory directory used for uploaded files and data directories from host"
-  def remove_service_directory(name)
-    with_accessory(name) do |accessory|
-      on(accessory.host) { execute *accessory.remove_service_directory }
-    end
-  end
-
-  private
-    def with_accessory(name)
-      if accessory = MRSK.accessory(name)
-        yield accessory
-      else
-        error_on_missing_accessory(name)
-      end
-    end
-
-    def error_on_missing_accessory(name)
-      options = MRSK.accessory_names.presence
-
-      error \
-        "No accessory by the name of '#{name}'" +
-        (options ? " (options: #{options.to_sentence})" : "")
-    end
-end

lib/mrsk/cli/app.rb

@@ -1,137 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::App < Mrsk::Cli::Base
-  desc "boot", "Boot app on servers (or start them if they've already been booted)"
-  def boot
-    MRSK.config.roles.each do |role|
-      on(role.hosts) do |host|
-        begin
-          execute *MRSK.app.run(role: role.name)
-        rescue SSHKit::Command::Failed => e
-          if e.message =~ /already in use/
-            error "Container with same version already deployed on #{host}, starting that instead"
-            execute *MRSK.app.start, host: host
-          else
-            raise
-          end
-        end
-      end
-    end
-  end
-  
-  desc "start", "Start existing app on servers (use --version=<git-hash> to designate specific version)"
-  option :version, desc: "Defaults to the most recent git-hash in local repository"
-  def start
-    if (version = options[:version]).present?
-      on(MRSK.hosts) { execute *MRSK.app.start(version: version) }
-    else
-      on(MRSK.hosts) { execute *MRSK.app.start, raise_on_non_zero_exit: false }
-    end
-  end
-  
-  desc "stop", "Stop app on servers"
-  def stop
-    on(MRSK.hosts) { execute *MRSK.app.stop, raise_on_non_zero_exit: false }
-  end
-  
-  desc "details", "Display details about app containers"
-  def details
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.info) }
-  end
-  
-  desc "exec [CMD]", "Execute a custom command on servers"
-  option :method, aliases: "-m", default: "exec", desc: "Execution method: [exec] perform inside app container / [run] perform in new container / [ssh] perform over ssh"
-  def exec(cmd)
-    runner = \
-      case options[:method]
-      when "exec" then "exec"
-      when "run"  then "run_exec"
-      when "ssh"  then "exec_over_ssh"
-      else raise "Unknown method: #{options[:method]}"
-      end.inquiry
-
-    if runner.exec_over_ssh?
-      run_locally do
-        info "Launching command on #{MRSK.primary_host}"
-        exec MRSK.app.exec_over_ssh(cmd, host: MRSK.primary_host)
-      end
-    else
-      on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.send(runner, cmd)) }
-    end
-  end
-
-  desc "console", "Start Rails Console on primary host (or specific host set by --hosts)"
-  def console
-    run_locally do
-      info "Launching Rails console on #{MRSK.primary_host}"
-      exec MRSK.app.console(host: MRSK.primary_host)
-    end
-  end
-
-  desc "bash", "Start a bash session on primary host (or specific host set by --hosts)"
-  def bash
-    run_locally do
-      info "Launching bash session on #{MRSK.primary_host}"
-      exec MRSK.app.bash(host: MRSK.primary_host)
-    end
-  end
-
-  desc "runner [EXPRESSION]", "Execute Rails runner with given expression"
-  def runner(expression)
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.exec("bin/rails", "runner", "'#{expression}'")) }
-  end
-
-  desc "containers", "List all the app containers currently on servers"
-  def containers
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.list_containers) }
-  end
-
-  desc "current", "Return the current running container ID"
-  def current
-    on(MRSK.hosts) { |host| puts_by_host host, capture_with_info(*MRSK.app.current_container_id) }
-  end
-  
-  desc "logs", "Show lines from app on servers"
-  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
-  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
-  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
-  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
-  def logs
-    # FIXME: Catch when app containers aren't running
-
-    grep = options[:grep]
-
-    if options[:follow]
-      run_locally do
-        info "Following logs on #{MRSK.primary_host}..."
-        info MRSK.app.follow_logs(host: MRSK.primary_host, grep: grep)
-        exec MRSK.app.follow_logs(host: MRSK.primary_host, grep: grep)
-      end
-    else
-      since = options[:since]
-      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
-
-      on(MRSK.hosts) do |host|
-        begin
-          puts_by_host host, capture_with_info(*MRSK.app.logs(since: since, lines: lines, grep: grep))
-        rescue SSHKit::Command::Failed
-          puts_by_host host, "Nothing found"
-        end
-      end
-    end
-  end
-
-  desc "remove", "Remove app containers and images from servers"
-  option :only, default: "", desc: "Use 'containers' or 'images'"
-  def remove
-    case options[:only]
-    when "containers"
-      on(MRSK.hosts) { execute *MRSK.app.remove_containers }
-    when "images"
-      on(MRSK.hosts) { execute *MRSK.app.remove_images }
-    else
-      on(MRSK.hosts) { execute *MRSK.app.remove_containers }
-      on(MRSK.hosts) { execute *MRSK.app.remove_images }
-    end
-  end
-end

lib/mrsk/cli/base.rb

@@ -1,57 +0,0 @@
-require "thor"
-require "mrsk/sshkit_with_ext"
-
-module Mrsk::Cli
-  class Base < Thor
-    include SSHKit::DSL
-
-    def self.exit_on_failure?() true end
-
-    class_option :verbose, type: :boolean, aliases: "-v", desc: "Detailed logging"
-    class_option :quiet, type: :boolean, aliases: "-q", desc: "Minimal logging"
-
-    class_option :version, desc: "Run commands against a specific app version"
-
-    class_option :primary, type: :boolean, aliases: "-p", desc: "Run commands only on primary host instead of all"
-    class_option :hosts, aliases: "-h", desc: "Run commands on these hosts instead of all (separate by comma)"
-    class_option :roles, aliases: "-r", desc: "Run commands on these roles instead of all (separate by comma)"
-
-    class_option :config_file, aliases: "-c", default: "config/deploy.yml", desc: "Path to config file (default: config/deploy.yml)"
-    class_option :destination, aliases: "-d", desc: "Specify destination to be used for config file (west -> deploy.west.yml)"
-
-    def initialize(*)
-      super
-      initialize_commander(options)
-    end
-
-    private
-      def initialize_commander(options)
-        MRSK.tap do |commander|
-          commander.config_file = Pathname.new(File.expand_path(options[:config_file]))
-          commander.destination = options[:destination]
-          commander.version     = options[:version]
-
-          commander.specific_hosts    = options[:hosts]&.split(",")
-          commander.specific_roles    = options[:roles]&.split(",")
-          commander.specific_primary! if options[:primary]
-
-          if options[:verbose]
-            ENV["VERBOSE"] = "1" # For backtraces via cli/start
-            commander.verbosity = :debug
-          end
-
-          if options[:quiet]
-            commander.verbosity = :error
-          end
-        end
-      end
-
-      def print_runtime
-        started_at = Time.now
-        yield
-      ensure
-        runtime = Time.now - started_at
-        puts "  Finished all in #{sprintf("%.1f seconds", runtime)}"
-      end
-  end
-end

lib/mrsk/cli/build.rb

@@ -1,68 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Build < Mrsk::Cli::Base
-  desc "deliver", "Deliver a newly built app image to servers"
-  def deliver
-    invoke :push
-    invoke :pull
-  end
-
-  desc "push", "Build locally and push app image to registry"
-  def push
-    cli = self
-
-    run_locally do 
-      begin
-        MRSK.with_verbosity(:debug) { execute *MRSK.builder.push }
-      rescue SSHKit::Command::Failed => e
-        if e.message =~ /(no builder)|(no such file or directory)/
-          error "Missing compatible builder, so creating a new one first"
-
-          if cli.create
-            MRSK.with_verbosity(:debug) { execute *MRSK.builder.push }
-          end
-        else
-          raise
-        end
-      end
-    end
-  end
-
-  desc "pull", "Pull app image from the registry onto servers"
-  def pull
-    on(MRSK.hosts) { execute *MRSK.builder.pull }
-  end
-
-  desc "create", "Create a local build setup"
-  def create
-    run_locally do
-      begin
-        debug "Using builder: #{MRSK.builder.name}"
-        execute *MRSK.builder.create
-      rescue SSHKit::Command::Failed => e
-        if e.message =~ /stderr=(.*)/
-          error "Couldn't create remote builder: #{$1}"
-          false
-        else
-          raise
-        end
-      end
-    end
-  end
-
-  desc "remove", "Remove local build setup"
-  def remove
-    run_locally do
-      debug "Using builder: #{MRSK.builder.name}"
-      execute *MRSK.builder.remove
-    end
-  end
-
-  desc "details", "Show the name of the configured builder"
-  def details
-    run_locally do
-      puts "Builder: #{MRSK.builder.name}"
-      puts capture(*MRSK.builder.info)
-    end
-  end
-end

lib/mrsk/cli/main.rb

@@ -1,120 +0,0 @@
-require "mrsk/cli/base"
-
-require "mrsk/cli/accessory"
-require "mrsk/cli/app"
-require "mrsk/cli/build"
-require "mrsk/cli/prune"
-require "mrsk/cli/registry"
-require "mrsk/cli/server"
-require "mrsk/cli/traefik"
-
-class Mrsk::Cli::Main < Mrsk::Cli::Base
-  desc "setup", "Setup all accessories and deploy the app to servers"
-  def setup
-    print_runtime do
-      invoke "mrsk:cli:server:bootstrap"
-      invoke "mrsk:cli:accessory:boot", [ "all" ]
-      deploy
-    end
-  end
-
-  desc "deploy", "Deploy the app to servers"
-  def deploy
-    print_runtime do
-      invoke "mrsk:cli:server:bootstrap"
-      invoke "mrsk:cli:registry:login"
-      invoke "mrsk:cli:build:deliver"
-      invoke "mrsk:cli:traefik:boot"
-      invoke "mrsk:cli:app:stop"
-      invoke "mrsk:cli:app:boot"
-      invoke "mrsk:cli:prune:all"
-    end
-  end
-
-  desc "redeploy", "Deploy new version of the app to servers (without bootstrapping servers, starting Traefik, pruning, and registry login)"
-  def redeploy
-    print_runtime do
-      invoke "mrsk:cli:build:deliver"
-      invoke "mrsk:cli:app:stop"
-      invoke "mrsk:cli:app:boot"
-    end
-  end
-
-  desc "rollback [VERSION]", "Rollback the app to VERSION (that must already be on servers)"
-  def rollback(version)
-    on(MRSK.hosts) do
-      execute *MRSK.app.stop, raise_on_non_zero_exit: false
-      execute *MRSK.app.start(version: version)
-    end
-  end
-
-  desc "details", "Display details about Traefik and app containers"
-  def details
-    invoke "mrsk:cli:traefik:details"
-    invoke "mrsk:cli:app:details"
-    invoke "mrsk:cli:accessory:details", [ "all" ]
-  end
-
-  desc "config", "Show combined config"
-  def config
-    run_locally do
-      puts MRSK.config.to_h.to_yaml
-    end
-  end
-
-  desc "install", "Create config stub in config/deploy.yml and binstub in bin/mrsk"
-  option :skip_binstub, type: :boolean, default: false, desc: "Skip adding MRSK to the Gemfile and creating bin/mrsk binstub"
-  def install
-    require "fileutils"
-
-    if (deploy_file = Pathname.new(File.expand_path("config/deploy.yml"))).exist?
-      puts "Config file already exists in config/deploy.yml (remove first to create a new one)"
-    else
-      FileUtils.cp_r Pathname.new(File.expand_path("templates/deploy.yml", __dir__)), deploy_file
-      puts "Created configuration file in config/deploy.yml"
-    end
-
-    unless options[:skip_binstub]
-      if (binstub = Pathname.new(File.expand_path("bin/mrsk"))).exist?
-        puts "Binstub already exists in bin/mrsk (remove first to create a new one)"
-      else
-        `bundle add mrsk`
-        `bundle binstubs mrsk`
-        puts "Created binstub file in bin/mrsk"
-      end
-    end
-  end
-
-  desc "remove", "Remove Traefik, app, and registry session from servers"
-  def remove
-    invoke "mrsk:cli:traefik:remove"
-    invoke "mrsk:cli:app:remove"
-    invoke "mrsk:cli:registry:logout"
-  end
-
-  desc "version", "Display the MRSK version"
-  def version
-    puts Mrsk::VERSION
-  end
-
-  desc "accessory", "Manage the accessories"
-  subcommand "accessory", Mrsk::Cli::Accessory
-
-  desc "app", "Manage the application"
-  subcommand "app", Mrsk::Cli::App
-
-  desc "build", "Build the application image"
-  subcommand "build", Mrsk::Cli::Build
-
-  desc "prune", "Prune old application images and containers"
-  subcommand "prune", Mrsk::Cli::Prune
-
-  desc "registry", "Login and out of the image registry"
-  subcommand "registry", Mrsk::Cli::Registry
-
-  desc "server", "Bootstrap servers with Docker"
-  subcommand "server", Mrsk::Cli::Server
-
-  desc "traefik", "Manage the Traefik load balancer"
-  subcommand "traefik", Mrsk::Cli::Traefik
-end

lib/mrsk/cli/prune.rb

@@ -1,19 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Prune < Mrsk::Cli::Base
-  desc "all", "Prune unused images and stopped containers"
-  def all
-    invoke :containers
-    invoke :images
-  end
-
-  desc "images", "Prune unused images older than 30 days"
-  def images
-    on(MRSK.hosts) { execute *MRSK.prune.images }
-  end
-
-  desc "containers", "Prune stopped containers for the service older than 3 days"
-  def containers
-    on(MRSK.hosts) { execute *MRSK.prune.containers }
-  end
-end

lib/mrsk/cli/registry.rb

@@ -1,18 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Registry < Mrsk::Cli::Base
-  desc "login", "Login to the registry locally and remotely"
-  def login
-    run_locally           { execute *MRSK.registry.login }
-    on(MRSK.hosts) { execute *MRSK.registry.login }
-  rescue ArgumentError => e
-    puts e.message
-  end
-
-  desc "logout", "Logout of the registry remotely"
-  def logout
-    on(MRSK.hosts) { execute *MRSK.registry.logout }
-  rescue ArgumentError => e
-    puts e.message
-  end
-end

lib/mrsk/cli/server.rb

@@ -1,8 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Server < Mrsk::Cli::Base
-  desc "bootstrap", "Ensure Docker is installed on the servers"
-  def bootstrap
-    on(MRSK.hosts + MRSK.accessory_hosts) { execute "which docker || (apt-get update -y && apt-get install docker.io -y)" }
-  end
-end

lib/mrsk/cli/templates/deploy.yml

@@ -1,17 +0,0 @@
-# Name of your application. Used to uniquely configuring Traefik and app containers.
-# Your Dockerfile should set LABEL service=the-same-value to ensure image pruning works.
-service: my-app
-
-# Name of the container image.
-image: user/my-app
-
-# Deploy to these servers.
-servers:
-  - 192.168.0.1
-
-# Credentials for your image host.
-registry:
-  # Specify the registry server, if you're not using Docker Hub
-  # server: registry.digitalocean.com / ghcr.io / ...
-  username: my-user
-  password: my-password-should-go-somewhere-safe

lib/mrsk/cli/traefik.rb

@@ -1,77 +0,0 @@
-require "mrsk/cli/base"
-
-class Mrsk::Cli::Traefik < Mrsk::Cli::Base
-  desc "boot", "Boot Traefik on servers"
-  def boot
-    on(MRSK.traefik_hosts) { execute *MRSK.traefik.run, raise_on_non_zero_exit: false }
-  end
-
-  desc "reboot", "Reboot Traefik on servers (stop container, remove container, start new container)"
-  def reboot
-    invoke :stop
-    invoke :remove_container
-    invoke :boot
-  end
-
-  desc "start", "Start existing Traefik on servers"
-  def start
-    on(MRSK.traefik_hosts) { execute *MRSK.traefik.start, raise_on_non_zero_exit: false }
-  end
-
-  desc "stop", "Stop Traefik on servers"
-  def stop
-    on(MRSK.traefik_hosts) { execute *MRSK.traefik.stop, raise_on_non_zero_exit: false }
-  end
-
-  desc "restart", "Restart Traefik on servers"
-  def restart
-    invoke :stop
-    invoke :start
-  end
-
-  desc "details", "Display details about Traefik containers from servers"
-  def details
-    on(MRSK.traefik_hosts) { |host| puts_by_host host, capture_with_info(*MRSK.traefik.info), type: "Traefik" }
-  end
-
-  desc "logs", "Show log lines from Traefik on servers"
-  option :since, aliases: "-s", desc: "Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)"
-  option :lines, type: :numeric, aliases: "-n", desc: "Number of log lines to pull from each server"
-  option :grep, aliases: "-g", desc: "Show lines with grep match only (use this to fetch specific requests by id)"
-  option :follow, aliases: "-f", desc: "Follow logs on primary server (or specific host set by --hosts)"
-  def logs
-    grep = options[:grep]
-
-    if options[:follow]
-      run_locally do
-        info "Following logs on #{MRSK.primary_host}..."
-        info MRSK.traefik.follow_logs(host: MRSK.primary_host, grep: grep)
-        exec MRSK.traefik.follow_logs(host: MRSK.primary_host, grep: grep)
-      end
-    else
-      since = options[:since]
-      lines = options[:lines].presence || ((since || grep) ? nil : 100) # Default to 100 lines if since or grep isn't set
-
-      on(MRSK.traefik_hosts) do |host|
-        puts_by_host host, capture(*MRSK.traefik.logs(since: since, lines: lines, grep: grep)), type: "Traefik"
-      end
-    end
-  end
-
-  desc "remove", "Remove Traefik container and image from servers"
-  def remove
-    invoke :stop
-    invoke :remove_container
-    invoke :remove_image
-  end
-
-  desc "remove_container", "Remove Traefik container from servers"
-  def remove_container
-    on(MRSK.traefik_hosts) { execute *MRSK.traefik.remove_container }
-  end
-
-  desc "remove_container", "Remove Traefik image from servers"
-  def remove_image
-    on(MRSK.traefik_hosts) { execute *MRSK.traefik.remove_image }
-  end
-end

lib/mrsk/commander.rb

@@ -1,100 +0,0 @@
-require "active_support/core_ext/enumerable"
-
-require "mrsk/configuration"
-require "mrsk/commands/accessory"
-require "mrsk/commands/app"
-require "mrsk/commands/builder"
-require "mrsk/commands/prune"
-require "mrsk/commands/traefik"
-require "mrsk/commands/registry"
-
-class Mrsk::Commander
-  attr_accessor :config_file, :destination, :verbosity, :version
-
-  def initialize(config_file: nil, destination: nil, verbosity: :info)
-    @config_file, @destination, @verbosity = config_file, destination, verbosity
-  end
-
-  def config
-    @config ||= \
-      Mrsk::Configuration
-        .create_from(config_file, destination: destination, version: cascading_version)
-        .tap { |config| configure_sshkit_with(config) }
-  end
-
-  attr_accessor :specific_hosts
-
-  def specific_primary!
-    self.specific_hosts = [ config.primary_web_host ]
-  end
-
-  def specific_roles=(role_names)
-    self.specific_hosts = config.roles.select { |r| role_names.include?(r.name) }.flat_map(&:hosts) if role_names.present?
-  end
-
-  def primary_host
-    specific_hosts&.sole || config.primary_web_host
-  end
-
-  def hosts
-    specific_hosts || config.all_hosts
-  end
-
-  def traefik_hosts
-    specific_hosts || config.traefik_hosts
-  end
-
-  def accessory_hosts
-    specific_hosts || config.accessories.collect(&:host)
-  end
-
-  def accessory_names
-    config.accessories&.collect(&:name) || []
-  end
-
-
-  def app
-    @app ||= Mrsk::Commands::App.new(config)
-  end
-
-  def builder
-    @builder ||= Mrsk::Commands::Builder.new(config)
-  end
-
-  def traefik
-    @traefik ||= Mrsk::Commands::Traefik.new(config)
-  end
-
-  def registry
-    @registry ||= Mrsk::Commands::Registry.new(config)
-  end
-
-  def prune
-    @prune ||= Mrsk::Commands::Prune.new(config)
-  end
-
-  def accessory(name)
-    Mrsk::Commands::Accessory.new(config, name: name)
-  end
-
-
-  def with_verbosity(level) 
-    old_level = SSHKit.config.output_verbosity
-    SSHKit.config.output_verbosity = level
-    yield
-  ensure
-    SSHKit.config.output_verbosity = old_level
-  end
-
-  private
-    def cascading_version
-      version.presence || ENV["VERSION"] || `git rev-parse HEAD`.strip
-    end
-
-    # Lazy setup of SSHKit
-    def configure_sshkit_with(config)
-      SSHKit::Backend::Netssh.configure { |ssh| ssh.ssh_options = config.ssh_options }
-      SSHKit.config.command_map[:docker] = "docker" # No need to use /usr/bin/env, just clogs up the logs
-      SSHKit.config.output_verbosity = verbosity
-    end
-end

lib/mrsk/commands.rb

@@ -1,2 +0,0 @@
-module Mrsk::Commands
-end

lib/mrsk/commands/app.rb

@@ -1,104 +0,0 @@
-require "mrsk/commands/base"
-
-class Mrsk::Commands::App < Mrsk::Commands::Base
-  def run(role: :web)
-    role = config.role(role)
-
-    docker :run,
-      "-d",
-      "--restart unless-stopped",
-      "--name", config.service_with_version,
-      *rails_master_key_arg,
-      *role.env_args,
-      *config.volume_args,
-      *role.label_args,
-      config.absolute_image,
-      role.cmd
-  end
-
-  def start(version: config.version)
-    docker :start, "#{config.service}-#{version}"
-  end
-
-  def current_container_id
-    docker :ps, "-q", *service_filter
-  end
-
-  def stop
-    pipe current_container_id, "xargs docker stop"
-  end
-
-  def info
-    docker :ps, *service_filter
-  end
-
-  def logs(since: nil, lines: nil, grep: nil)
-    pipe \
-      current_container_id,
-      "xargs docker logs#{" --since #{since}" if since}#{" -n #{lines}" if lines} 2>&1",
-      ("grep '#{grep}'" if grep)
-  end
-
-  def exec(*command, interactive: false)
-    docker :exec,
-      ("-it" if interactive),
-      config.service_with_version,
-      *command
-  end
-
-  def run_exec(*command, interactive: false)
-    docker :run,
-      ("-it" if interactive),
-      "--rm",
-      *rails_master_key_arg,
-      *config.env_args,
-      *config.volume_args,
-      config.absolute_image,
-      *command
-  end
-
-  def exec_over_ssh(*command, host:)
-    run_over_ssh run_exec(*command, interactive: true).join(" "), host: host
-  end
-
-  def follow_logs(host:, grep: nil)
-    run_over_ssh pipe(
-      current_container_id,
-      "xargs docker logs -t -n 10 -f 2>&1",
-      (%(grep "#{grep}") if grep)
-    ).join(" "), host: host
-  end
-
-  def console(host:)
-    exec_over_ssh "bin/rails", "c", host: host
-  end
-
-  def bash(host:)
-    exec_over_ssh "bash", host: host
-  end
-
-  def list_containers
-    docker :container, :ls, "-a", *service_filter
-  end
-
-  def remove_containers
-    docker :container, :prune, "-f", *service_filter
-  end
-
-  def remove_images
-    docker :image, :prune, "-a", "-f", *service_filter
-  end
-
-  private
-    def service_filter
-      [ "--filter", "label=service=#{config.service}" ]
-    end
-
-    def rails_master_key_arg
-      if master_key = config.master_key
-        [ "-e", redact("RAILS_MASTER_KEY=#{master_key}") ]
-      else
-        []
-      end
-    end
-end

lib/mrsk/commands/base.rb

@@ -1,35 +0,0 @@
-module Mrsk::Commands
-  class Base
-    delegate :redact, to: Mrsk::Utils
-
-    attr_accessor :config
-
-    def initialize(config)
-      @config = config
-    end
-
-    def run_over_ssh(command, host:)
-      "ssh -t #{config.ssh_user}@#{host} '#{command}'"
-    end
-
-    private
-      def combine(*commands, by: "&&")
-        commands
-          .compact
-          .collect { |command| Array(command) + [ by ] }.flatten # Join commands
-          .tap     { |commands| commands.pop } # Remove trailing combiner
-      end
-
-      def chain(*commands)
-        combine *commands, by: ";"
-      end
-
-      def pipe(*commands)
-        combine *commands, by: "|"
-      end
-
-      def docker(*args)
-        args.compact.unshift :docker
-      end
-  end
-end

lib/mrsk/commands/builder.rb

@@ -1,43 +0,0 @@
-require "mrsk/commands/base"
-
-class Mrsk::Commands::Builder < Mrsk::Commands::Base
-  delegate :create, :remove, :push, :pull, :info, to: :target
-
-  def name
-    target.class.to_s.remove("Mrsk::Commands::Builder::").underscore
-  end
-
-  def target
-    case
-    when config.builder && config.builder["multiarch"] == false
-      native
-    when config.builder && config.builder["local"] && config.builder["remote"]
-      multiarch_remote
-    when config.builder && config.builder["remote"]
-      native_remote
-    else
-      multiarch
-    end
-  end
-
-  def native
-    @native ||= Mrsk::Commands::Builder::Native.new(config)
-  end
-
-  def native_remote
-    @native ||= Mrsk::Commands::Builder::Native::Remote.new(config)
-  end
-
-  def multiarch
-    @multiarch ||= Mrsk::Commands::Builder::Multiarch.new(config)
-  end
-
-  def multiarch_remote
-    @multiarch_remote ||= Mrsk::Commands::Builder::Multiarch::Remote.new(config)
-  end
-end
-
-require "mrsk/commands/builder/native"
-require "mrsk/commands/builder/native/remote"
-require "mrsk/commands/builder/multiarch"
-require "mrsk/commands/builder/multiarch/remote"

lib/mrsk/commands/builder/base.rb

@@ -1,26 +0,0 @@
-require "mrsk/commands/base"
-
-class Mrsk::Commands::Builder::Base < Mrsk::Commands::Base
-  delegate :argumentize, to: Mrsk::Utils
-
-  def pull
-    docker :pull, config.absolute_image
-  end
-
-  def build_args
-    argumentize "--build-arg", args, redacted: true
-  end
-
-  def build_secrets
-    argumentize "--secret", secrets.collect { |secret| [ "id", secret ] }
-  end
-
-  private
-    def args
-      (config.builder && config.builder["args"]) || {}
-    end
-
-    def secrets
-      (config.builder && config.builder["secrets"]) || []
-    end
-end

lib/mrsk/commands/builder/native.rb

@@ -1,21 +0,0 @@
-require "mrsk/commands/builder/base"
-
-class Mrsk::Commands::Builder::Native < Mrsk::Commands::Builder::Base
-  def create
-    # No-op on native
-  end
-
-  def remove
-    # No-op on native
-  end
-
-  def push
-    combine \
-      docker(:build, "-t", *build_args, *build_secrets, config.absolute_image, "."),
-      docker(:push, config.absolute_image)
-  end
-
-  def info
-    # No-op on native
-  end
-end

lib/mrsk/commands/prune.rb

@@ -1,17 +0,0 @@
-require "mrsk/commands/base"
-require "active_support/duration"
-require "active_support/core_ext/numeric/time"
-
-class Mrsk::Commands::Prune < Mrsk::Commands::Base
-  PRUNE_IMAGES_AFTER     = 30.days.in_hours.to_i
-  PRUNE_CONTAINERS_AFTER =  3.days.in_hours.to_i
-
-  def images
-    docker :image, :prune, "-f", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
-  end
-
-  def containers
-    docker :image, :prune, "-f", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
-    docker :container, :prune, "-f", "--filter", "label=service=#{config.service}", "--filter", "'until=#{PRUNE_CONTAINERS_AFTER}h'"
-  end
-end

lib/mrsk/commands/registry.rb

@@ -1,13 +0,0 @@
-require "mrsk/commands/base"
-
-class Mrsk::Commands::Registry < Mrsk::Commands::Base
-  delegate :registry, to: :config
-
-  def login
-    docker :login, registry["server"], "-u", redact(registry["username"]), "-p", redact(registry["password"])
-  end
-
-  def logout
-    docker :logout, registry["server"]
-  end
-end

lib/mrsk/commands/traefik.rb

@@ -1,53 +0,0 @@
-require "mrsk/commands/base"
-
-class Mrsk::Commands::Traefik < Mrsk::Commands::Base
-  def run
-    docker :run, "--name traefik",
-      "-d",
-      "--restart unless-stopped",
-      "-p 80:80",
-      "-v /var/run/docker.sock:/var/run/docker.sock",
-      "traefik",
-      "--providers.docker",
-      "--log.level=DEBUG",
-      *cmd_args
-  end
-
-  def start
-    docker :container, :start, "traefik"
-  end
-
-  def stop
-    docker :container, :stop, "traefik"
-  end
-
-  def info
-    docker :ps, "--filter", "name=traefik"
-  end
-
-  def logs(since: nil, lines: nil, grep: nil)
-    pipe \
-      docker(:logs, "traefik", (" --since #{since}" if since), (" -n #{lines}" if lines), "-t", "2>&1"),
-      ("grep '#{grep}'" if grep)
-  end
-
-  def follow_logs(host:, grep: nil)
-    run_over_ssh pipe(
-      docker(:logs, "traefik", "-t", "-n", "10", "-f", "2>&1"),
-      (%(grep "#{grep}") if grep)
-    ).join(" "), host: host
-  end
-
-  def remove_container
-    docker :container, :prune, "-f", "--filter", "label=org.opencontainers.image.title=Traefik"
-  end
-
-  def remove_image
-    docker :image, :prune, "-a", "-f", "--filter", "label=org.opencontainers.image.title=Traefik"
-  end
-
-  private
-    def cmd_args
-      (config.raw_config.dig(:traefik, "args") || { }).collect { |(key, value)| [ "--#{key}", value ] }.flatten
-    end
-end

lib/mrsk/configuration.rb

@@ -1,179 +0,0 @@
-require "active_support/ordered_options"
-require "active_support/core_ext/string/inquiry"
-require "active_support/core_ext/module/delegation"
-require "pathname"
-require "erb"
-require "mrsk/utils"
-
-class Mrsk::Configuration
-  delegate :service, :image, :servers, :env, :labels, :registry, :builder, to: :raw_config, allow_nil: true
-  delegate :argumentize, :argumentize_env_with_secrets, to: Mrsk::Utils
-
-  attr_accessor :raw_config
-
-  class << self
-    def create_from(base_config_file, destination: nil, version: "missing")
-      new(load_config_file(base_config_file).tap do |config|
-        if destination
-          config.deep_merge! \
-            load_config_file destination_config_file(base_config_file, destination)
-        end
-      end, version: version)
-    end
-
-    private
-      def load_config_file(file)
-        if file.exist?
-          YAML.load(ERB.new(IO.read(file)).result).symbolize_keys
-        else
-          raise "Configuration file not found in #{file}"
-        end
-      end
-
-      def destination_config_file(base_config_file, destination)
-        dir, basename = base_config_file.split
-        dir.join basename.to_s.remove(".yml") + ".#{destination}.yml"
-      end
-  end
-
-  def initialize(raw_config, version: "missing", validate: true)
-    @raw_config = ActiveSupport::InheritableOptions.new(raw_config)
-    @version = version
-    valid? if validate
-  end
-
-
-  def roles
-    @roles ||= role_names.collect { |role_name| Role.new(role_name, config: self) }
-  end
-
-  def role(name)
-    roles.detect { |r| r.name == name.to_s }
-  end
-
-  def accessories
-    @accessories ||= raw_config.accessories&.keys&.collect { |name| Mrsk::Configuration::Assessory.new(name, config: self) } || []
-  end
-
-  def accessory(name)
-    accessories.detect { |a| a.name == name.to_s }
-  end
-
-
-  def all_hosts
-    roles.flat_map(&:hosts)
-  end
-
-  def primary_web_host
-    role(:web).hosts.first
-  end
-
-  def traefik_hosts
-    roles.select(&:running_traefik?).flat_map(&:hosts)
-  end
-
-
-  def version
-    @version
-  end
-
-  def repository
-    [ raw_config.registry["server"], image ].compact.join("/")
-  end
-
-  def absolute_image
-    "#{repository}:#{version}"
-  end
-
-  def service_with_version
-    "#{service}-#{version}"
-  end
-
-
-  def env_args
-    if raw_config.env.present?
-      argumentize_env_with_secrets(raw_config.env)
-    else
-      []
-    end
-  end
-
-  def volume_args
-    if raw_config.volumes.present?
-      argumentize "--volume", raw_config.volumes
-    else
-      []
-    end
-  end
-
-  def ssh_user
-    raw_config.ssh_user || "root"
-  end
-
-  def ssh_options
-    { user: ssh_user, auth_methods: [ "publickey" ] }
-  end
-
-  def master_key
-    unless raw_config.skip_master_key
-      ENV["RAILS_MASTER_KEY"] || File.read(Pathname.new(File.expand_path("config/master.key")))
-    end
-  end
-
-
-  def valid?
-    ensure_required_keys_present && ensure_env_available
-  end
-
-
-  def to_h
-    {
-      roles: role_names,
-      hosts: all_hosts,
-      primary_host: primary_web_host,
-      version: version,
-      repository: repository,
-      absolute_image: absolute_image,
-      service_with_version: service_with_version,
-      env_args: env_args,
-      volume_args: volume_args,
-      ssh_options: ssh_options,
-      builder: raw_config.builder,
-      accessories: raw_config.accessories
-    }.compact
-  end
-
-
-  private
-    # Will raise ArgumentError if any required config keys are missing
-    def ensure_required_keys_present
-      %i[ service image registry servers ].each do |key|
-        raise ArgumentError, "Missing required configuration for #{key}" unless raw_config[key].present?
-      end
-
-      if raw_config.registry["username"].blank?
-        raise ArgumentError, "You must specify a username for the registry in config/deploy.yml"
-      end
-
-      if raw_config.registry["password"].blank?
-        raise ArgumentError, "You must specify a password for the registry in config/deploy.yml (or set the ENV variable if that's used)"
-      end
-
-      true
-    end
-
-    # Will raise KeyError if any secret ENVs are missing
-    def ensure_env_available
-      env_args
-      roles.each(&:env_args)
-
-      true
-    end
-
-    def role_names
-      raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort
-    end
-end
-
-require "mrsk/configuration/role"
-require "mrsk/configuration/accessory"

lib/mrsk/configuration/role.rb

@@ -1,102 +0,0 @@
-class Mrsk::Configuration::Role
-  delegate :argumentize, :argumentize_env_with_secrets, to: Mrsk::Utils
-
-  attr_accessor :name
-
-  def initialize(name, config:)
-   @name, @config = name.inquiry, config
-  end
-
-  def hosts
-    @hosts ||= extract_hosts_from_config
-  end
-
-  def labels
-    default_labels.merge(traefik_labels).merge(custom_labels)
-  end
-
-  def label_args
-    argumentize "--label", labels
-  end
-
-  def env
-    if config.env && config.env["secret"]
-      merged_env_with_secrets
-    else
-      merged_env
-    end
-  end
-
-  def env_args
-    argumentize_env_with_secrets env
-  end
-
-  def cmd
-    specializations["cmd"]
-  end
-
-  def running_traefik?
-    name.web? || specializations["traefik"]
-  end
-
-  private
-    attr_accessor :config
-
-    def extract_hosts_from_config
-      if config.servers.is_a?(Array)
-        config.servers
-      else
-        servers = config.servers[name]
-        servers.is_a?(Array) ? servers : servers["hosts"]
-      end
-    end
-
-    def default_labels
-      { "service" => config.service, "role" => name }
-    end
-
-    def traefik_labels
-      if running_traefik?
-        {
-          "traefik.http.routers.#{config.service}.rule" => "'PathPrefix(`/`)'",
-          "traefik.http.services.#{config.service}.loadbalancer.healthcheck.path" => "/up",
-          "traefik.http.services.#{config.service}.loadbalancer.healthcheck.interval" => "1s",
-          "traefik.http.middlewares.#{config.service}.retry.attempts" => "3",
-          "traefik.http.middlewares.#{config.service}.retry.initialinterval" => "500ms"
-        }
-      else
-        {}
-      end
-    end
-
-    def custom_labels
-      Hash.new.tap do |labels|
-        labels.merge!(config.labels) if config.labels.present?
-        labels.merge!(specializations["labels"]) if specializations["labels"].present?
-      end
-    end
-
-    def specializations
-      if config.servers.is_a?(Array) || config.servers[name].is_a?(Array)
-        { }
-      else
-        config.servers[name].except("hosts")
-      end
-    end
-
-    def specialized_env
-      specializations["env"] || {}
-    end
-
-    def merged_env
-      config.env&.merge(specialized_env) || {}
-    end
-
-    # Secrets are stored in an array, which won't merge by default, so have to do it by hand.
-    def merged_env_with_secrets
-      merged_env.tap do |new_env|
-        new_env["secret"] = Array(config.env["secret"]) + Array(specialized_env["secret"])
-        new_env["clear"]  = (Array(config.env["clear"] || config.env) + Array(specialized_env["clear"] || specialized_env)).uniq
-      end
-    end
-end