Bootstrap: use multi-platform installer

* Limit auto-install to root users; otherwise, give manual install guidance
* Support non-Debian/Ubuntu with the multi-OS get.docker.com installer

lib/mrsk/cli/main.rb

@@ -17,9 +17,6 @@ class Mrsk::Cli::Main < Mrsk::Cli::Base
       invoke_options = deploy_options
 
       runtime = print_runtime do
-        say "Ensure curl and Docker are installed...", :magenta
-        invoke "mrsk:cli:server:bootstrap", [], invoke_options
-
         say "Log into image registry...", :magenta
         invoke "mrsk:cli:registry:login", [], invoke_options
 

lib/mrsk/cli/server.rb

@@ -1,17 +1,21 @@
 class Mrsk::Cli::Server < Mrsk::Cli::Base
-  desc "bootstrap", "Ensure curl and Docker are installed on servers"
+  desc "bootstrap", "Set up Docker to run MRSK apps"
   def bootstrap
-    with_lock do
+    missing = []
-      on(MRSK.hosts + MRSK.accessory_hosts) do
-        dependencies_to_install = Array.new.tap do |dependencies|
-          dependencies << "curl" unless execute "which curl", raise_on_non_zero_exit: false
-          dependencies << "docker.io" unless execute "which docker", raise_on_non_zero_exit: false
-        end
 
-        if dependencies_to_install.any?
+    on(MRSK.hosts | MRSK.accessory_hosts) do |host|
-          execute "apt-get update -y && apt-get install #{dependencies_to_install.join(" ")} -y"
+      unless execute(*MRSK.docker.installed?, raise_on_non_zero_exit: false)
+        if execute(*MRSK.docker.superuser?, raise_on_non_zero_exit: false)
+          info "Missing Docker on #{host}. Installing…"
+          execute *MRSK.docker.install
+        else
+          missing << host
         end
       end
     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/mrsk/commander.rb

@@ -84,6 +84,10 @@ class Mrsk::Commander
     @builder ||= Mrsk::Commands::Builder.new(config)
   end
 
+  def docker
+    @docker ||= Mrsk::Commands::Docker.new(config)
+  end
+
   def healthcheck
     @healthcheck ||= Mrsk::Commands::Healthcheck.new(config)
   end

lib/mrsk/commands/docker.rb

@@ -0,0 +1,21 @@
+class Mrsk::Commands::Docker < Mrsk::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

test/cli/main_test.rb

@@ -12,7 +12,6 @@ class CliMainTest < CliTestCase
   test "deploy" do
     invoke_options = { "config_file" => "test/fixtures/deploy_simple.yml", "skip_broadcast" => false, "version" => "999" }
 
-    Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:server:bootstrap", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:registry:login", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:build:deliver", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:traefik:boot", [], invoke_options)
@@ -22,7 +21,6 @@ class CliMainTest < CliTestCase
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:prune:all", [], invoke_options)
 
     run_command("deploy").tap do |output|
-      assert_match /Ensure curl and Docker are installed/, output
       assert_match /Log into image registry/, output
       assert_match /Build and push app image/, output
       assert_match /Ensure Traefik is running/, output
@@ -35,7 +33,6 @@ class CliMainTest < CliTestCase
   test "deploy with skip_push" do
     invoke_options = { "config_file" => "test/fixtures/deploy_simple.yml", "skip_broadcast" => false, "version" => "999" }
 
-    Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:server:bootstrap", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:registry:login", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:build:pull", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:traefik:boot", [], invoke_options)
@@ -46,7 +43,6 @@ class CliMainTest < CliTestCase
 
     run_command("deploy", "--skip_push").tap do |output|
       assert_match /Acquiring the deploy lock/, output
-      assert_match /Ensure curl and Docker are installed/, output
       assert_match /Log into image registry/, output
       assert_match /Pull app image/, output
       assert_match /Ensure Traefik is running/, output
@@ -87,7 +83,6 @@ class CliMainTest < CliTestCase
   test "deploy errors during critical section leave lock in place" do
     invoke_options = { "config_file" => "test/fixtures/deploy_simple.yml", "skip_broadcast" => false, "version" => "999" }
 
-    Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:server:bootstrap", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:registry:login", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:build:deliver", [], invoke_options)
     Mrsk::Cli::Main.any_instance.expects(:invoke).with("mrsk:cli:app:stale_containers", [], invoke_options)
@@ -106,7 +101,7 @@ class CliMainTest < CliTestCase
     invoke_options = { "config_file" => "test/fixtures/deploy_simple.yml", "skip_broadcast" => false, "version" => "999" }
 
     Mrsk::Cli::Main.any_instance.expects(:invoke)
-      .with("mrsk:cli:server:bootstrap", [], invoke_options)
+      .with("mrsk:cli:registry:login", [], invoke_options)
       .raises(RuntimeError)
 
     assert !MRSK.holding_lock?

test/cli/server_test.rb

@@ -1,11 +1,30 @@
 require_relative "cli_test_case"
 
 class CliServerTest < CliTestCase
-  test "bootstrap" do
+  test "bootstrap already installed" do
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with(:docker, "-v", raise_on_non_zero_exit: false).returns(true).at_least_once
+
+    assert_equal "", run_command("bootstrap")
+  end
+
+  test "bootstrap install as non-root user" do
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with(:docker, "-v", raise_on_non_zero_exit: false).returns(false).at_least_once
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with('[ "${EUID:-$(id -u)}" -eq 0 ]', raise_on_non_zero_exit: false).returns(false).at_least_once
+
+    assert_raise RuntimeError, "Docker is not installed on 1.1.1.1, 1.1.1.3, 1.1.1.4, 1.1.1.2 and can't be automatically intalled without having root access and the `curl` command available. Install Docker manually: https://docs.docker.com/engine/install/" do
+      run_command("bootstrap")
+    end
+  end
+
+  test "bootstrap install as root user" do
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with(:docker, "-v", raise_on_non_zero_exit: false).returns(false).at_least_once
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with('[ "${EUID:-$(id -u)}" -eq 0 ]', raise_on_non_zero_exit: false).returns(true).at_least_once
+    SSHKit::Backend::Abstract.any_instance.expects(:execute).with(:curl, "-fsSL", "https://get.docker.com", "|", :sh).at_least_once
+
     run_command("bootstrap").tap do |output|
-      assert_match /which curl/, output
+      ("1.1.1.1".."1.1.1.4").map do |host|
-      assert_match /which docker/, output
+        assert_match "Missing Docker on #{host}. Installing…", output
-      assert_match /apt-get update -y && apt-get install curl docker.io -y/, output
+      end
     end
   end
 

test/commands/docker_test.rb

@@ -0,0 +1,26 @@
+require "test_helper"
+
+class CommandsDockerTest < ActiveSupport::TestCase
+  setup do
+    @config = {
+      service: "app", image: "dhh/app", registry: { "username" => "dhh", "password" => "secret" }, servers: [ "1.1.1.1" ]
+    }
+    @docker = Mrsk::Commands::Docker.new(Mrsk::Configuration.new(@config))
+  end
+
+  test "install" do
+    assert_equal "curl -fsSL https://get.docker.com | sh", @docker.install.join(" ")
+  end
+
+  test "installed?" do
+    assert_equal "docker -v", @docker.installed?.join(" ")
+  end
+
+  test "running?" do
+    assert_equal "docker version", @docker.running?.join(" ")
+  end
+
+  test "superuser?" do
+    assert_equal '[ "${EUID:-$(id -u)}" -eq 0 ]', @docker.superuser?.join(" ")
+  end
+end