Show container logs and healthcheck status on failure

lib/kamal/cli/app.rb

@@ -15,7 +15,7 @@ class Kamal::Cli::App < Kamal::Cli::Base
           end
 
           #  Primary hosts and roles are returned first, so they can open the barrier
-          barrier = Kamal::Cli::Healthcheck::Barrier.new if KAMAL.roles.many?
+          barrier = Kamal::Cli::Healthcheck::Barrier.new
 
           on(KAMAL.hosts, **KAMAL.boot_strategy) do |host|
             KAMAL.roles_on(host).each do |role|

lib/kamal/cli/app/boot.rb

@@ -1,6 +1,6 @@
 class Kamal::Cli::App::Boot
   attr_reader :host, :role, :version, :barrier, :sshkit
-  delegate :execute, :capture_with_info, :info, to: :sshkit
+  delegate :execute, :capture_with_info, :capture_with_pretty_json, :info, :error, to: :sshkit
   delegate :uses_cord?, :assets?, :running_traefik?, to: :role
 
   def initialize(host, role, sshkit, version, barrier)
@@ -55,7 +55,11 @@ class Kamal::Cli::App::Boot
 
       reach_barrier
     rescue => e
-      close_barrier if barrier_role?
+      if barrier_role? && barrier.close
+        info "Deploy failed, so closed barrier (#{host})"
+        error capture_with_info(*app.logs(version: version))
+        error capture_with_info(*app.container_health_log(version: version))
+      end
       execute *app.stop(version: version), raise_on_non_zero_exit: false
 
       raise
@@ -92,14 +96,10 @@ class Kamal::Cli::App::Boot
       barrier.wait
       info "Barrier opened (#{host})"
     rescue Kamal::Cli::Healthcheck::Error
-      info "Barrier closed, shutting down new container... (#{host})"
+      info "Barrier closed, shutting down new container (#{host})..."
       raise
     end
 
-    def close_barrier
-      barrier&.close
-    end
-
     def barrier_role?
       role == KAMAL.primary_role
     end

lib/kamal/commands/app/containers.rb

@@ -1,4 +1,6 @@
 module Kamal::Commands::App::Containers
+  DOCKER_HEALTH_LOG_FORMAT    = "'{{json .State.Health}}'"
+
   def list_containers
     docker :container, :ls, "--all", *filter_args
   end
@@ -20,4 +22,10 @@ module Kamal::Commands::App::Containers
   def remove_containers
     docker :container, :prune, "--force", *filter_args
   end
+
+  def container_health_log(version:)
+    pipe \
+      container_id_for(container_name: container_name(version)),
+      xargs(docker(:inspect, "--format", DOCKER_HEALTH_LOG_FORMAT))
+  end
 end

lib/kamal/commands/app/logging.rb

@@ -1,7 +1,7 @@
 module Kamal::Commands::App::Logging
-  def logs(since: nil, lines: nil, grep: nil)
+  def logs(version: nil, since: nil, lines: nil, grep: nil)
     pipe \
-      current_running_container_id,
+      version ? container_id_for_version(version) : current_running_container_id,
       "xargs docker logs#{" --since #{since}" if since}#{" --tail #{lines}" if lines} 2>&1",
       ("grep '#{grep}'" if grep)
   end

lib/kamal/commands/base.rb

@@ -3,7 +3,6 @@ module Kamal::Commands
     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