Stop app container by container id

lib/kamal/cli/app.rb

@@ -66,13 +66,16 @@ def start
   end
 
   desc "stop", "Stop app container on servers"
+  option :container_id, desc: "Docker container ID to stop (instead of stopping all containers)"
   def stop
+    container_id = options[:container_id]
+
     with_lock do
       on(KAMAL.app_hosts) do |host|
         roles = KAMAL.roles_on(host)
 
         roles.each do |role|
-          app = KAMAL.app(role: role, host: host)
+          app = KAMAL.app(role: role, host: host, container_id: container_id)
           execute *KAMAL.auditor.record("Stopped app", role: role), verbosity: :debug
 
           if role.running_proxy?

lib/kamal/commander.rb

@@ -81,8 +81,8 @@ def accessory_names
     config.accessories&.collect(&:name) || []
   end
 
-  def app(role: nil, host: nil)
-    Kamal::Commands::App.new(config, role: role, host: host)
+  def app(role: nil, host: nil, container_id: nil)
+    Kamal::Commands::App.new(config, role: role, host: host, container_id: container_id)
   end
 
   def accessory(name)

lib/kamal/commands/app.rb

@@ -3,14 +3,15 @@ class Kamal::Commands::App < Kamal::Commands::Base
 
   ACTIVE_DOCKER_STATUSES = [ :running, :restarting ]
 
-  attr_reader :role, :host
+  attr_reader :role, :host, :container_id
 
   delegate :container_name, to: :role
 
-  def initialize(config, role: nil, host: nil)
+  def initialize(config, role: nil, host: nil, container_id: nil)
     super(config)
     @role = role
     @host = host
+    @container_id = container_id
   end
 
   def run(hostname: nil)
@@ -54,7 +55,7 @@ def info
 
 
   def current_running_container_id
-    current_running_container(format: "--quiet")
+    container_id || current_running_container(format: "--quiet")
   end
 
   def container_id_for_version(version, only_running: false)

test/cli/app_test.rb

@@ -250,6 +250,12 @@ class CliAppTest < CliTestCase
     end
   end
 
+  test "stop with container id" do
+    run_command("stop", "--container-id", "abcd1234").tap do |output|
+      assert_match "abcd1234 | xargs docker stop", output
+    end
+  end
+
   test "stale_containers" do
     SSHKit::Backend::Abstract.any_instance.expects(:capture_with_info)
       .with(:docker, :ps, "--filter", "label=service=app", "--filter", "label=destination=", "--filter", "label=role=web", "--format", "\"{{.Names}}\"", "|", "while read line; do echo ${line#app-web-}; done", raise_on_non_zero_exit: false)