Allow to override network

lib/kamal/commands/accessory.rb

@@ -1,7 +1,7 @@
 class Kamal::Commands::Accessory < Kamal::Commands::Base
   attr_reader :accessory_config
   delegate :service_name, :image, :hosts, :port, :files, :directories, :cmd,
-           :publish_args, :env_args, :volume_args, :label_args, :option_args,
+           :network_args, :publish_args, :env_args, :volume_args, :label_args, :option_args,
            :secrets_io, :secrets_path, :env_directory,
            to: :accessory_config
 
@@ -15,7 +15,7 @@ def run
       "--name", service_name,
       "--detach",
       "--restart", "unless-stopped",
-      "--network", "kamal",
+      *network_args,
       *config.logging_args,
       *publish_args,
       *env_args,
@@ -64,7 +64,7 @@ def execute_in_new_container(*command, interactive: false)
     docker :run,
       ("-it" if interactive),
       "--rm",
-      "--network", "kamal",
+      *network_args,
       *env_args,
       *volume_args,
       image,

lib/kamal/configuration/accessory.rb

@@ -1,6 +1,8 @@
 class Kamal::Configuration::Accessory
   include Kamal::Configuration::Validation
 
+  DEFAULT_NETWORK = "kamal"
+
   delegate :argumentize, :optionize, to: Kamal::Utils
 
   attr_reader :name, :accessory_config, :env
@@ -38,6 +40,10 @@ def port
     end
   end
 
+  def network_args
+    argumentize "--network", network
+  end
+
   def publish_args
     argumentize "--publish", port if port
   end
@@ -173,4 +179,8 @@ def hosts_from_roles
         accessory_config["roles"].flat_map { |role| config.role(role).hosts }
       end
     end
+
+    def network
+      accessory_config["network"] || DEFAULT_NETWORK
+    end
 end

lib/kamal/configuration/docs/accessory.yml

@@ -90,3 +90,11 @@ accessories:
     # They are not created or copied before mounting:
     volumes:
       - /path/to/mysql-logs:/var/log/mysql
+
+    # Network
+    #
+    # The network the accessory will be attached to.
+    #
+    # Defaults to kamal:
+    network: custom
+

test/commands/accessory_test.rb

@@ -71,6 +71,14 @@ class CommandsAccessoryTest < ActiveSupport::TestCase
       new_command(:busybox).run.join(" ")
   end
 
+  test "run in custom network" do
+    @config[:accessories]["mysql"]["network"] = "custom"
+
+    assert_equal \
+      "docker run --name app-mysql --detach --restart unless-stopped --network custom --log-opt max-size=\"10m\" --publish 3306:3306 --env MYSQL_ROOT_HOST=\"%\" --env-file .kamal/apps/app/env/accessories/mysql.env --label service=\"app-mysql\" private.registry/mysql:8.0",
+      new_command(:mysql).run.join(" ")
+  end
+
   test "start" do
     assert_equal \
       "docker container start app-mysql",

test/configuration/accessory_test.rb

@@ -152,4 +152,13 @@ class ConfigurationAccessoryTest < ActiveSupport::TestCase
   test "options" do
     assert_equal [ "--cpus", "\"4\"", "--memory", "\"2GB\"" ], @config.accessory(:redis).option_args
   end
+
+  test "network_args default" do
+    assert_equal [ "--network", "kamal" ], @config.accessory(:mysql).network_args
+  end
+
+  test "network_args with configured options" do
+    @deploy[:accessories]["mysql"]["network"] = "database"
+    assert_equal [ "--network", "database" ], @config.accessory(:mysql).network_args
+  end
 end