Allow the driver to be set

lib/kamal/commands/builder/base.rb

@@ -6,7 +6,7 @@ class Kamal::Commands::Builder::Base < Kamal::Commands::Base
   delegate :argumentize, to: Kamal::Utils
   delegate \
     :args, :secrets, :dockerfile, :target, :local_arch, :remote_arch, :remote_host,
-    :cache_from, :cache_to, :multiarch?, :ssh,
+    :cache_from, :cache_to, :multiarch?, :ssh, :driver, :docker_driver?,
     to: :builder_config
 
   def clean
@@ -17,7 +17,7 @@ class Kamal::Commands::Builder::Base < Kamal::Commands::Base
     docker :build,
       "--push",
       *platform_options,
-      "--builder", builder_name,
+      *([ "--builder", builder_name ] unless docker_driver?),
       *build_options,
       build_context
   end

lib/kamal/commands/builder/hybrid.rb

@@ -8,11 +8,11 @@ class Kamal::Commands::Builder::Hybrid < Kamal::Commands::Builder::Remote
 
   private
     def builder_name
-      "kamal-hybrid-#{local_arch}-#{remote_arch}-#{remote_host.gsub(/[^a-z0-9_-]/, "-")}"
+      "kamal-hybrid-#{driver}-#{local_arch}-#{remote_arch}-#{remote_host.gsub(/[^a-z0-9_-]/, "-")}"
     end
 
     def create_local_buildx
-      docker :buildx, :create, "--name", builder_name, "--platform", "linux/#{local_arch}", "--driver=docker-container"
+      docker :buildx, :create, "--name", builder_name, "--platform", "linux/#{local_arch}", "--driver=#{driver}"
     end
 
     def append_remote_buildx

lib/kamal/commands/builder/local.rb

@@ -1,15 +1,15 @@
 class Kamal::Commands::Builder::Local < Kamal::Commands::Builder::Base
   def create
-    docker :buildx, :create, "--name", builder_name, "--driver=docker-container"
+    docker :buildx, :create, "--name", builder_name, "--driver=#{driver}" unless docker_driver?
   end
 
   def remove
-    docker :buildx, :rm, builder_name
+    docker :buildx, :rm, builder_name unless docker_driver?
   end
 
   private
     def builder_name
-      "kamal-local"
+      "kamal-local-#{driver}"
     end
 
     def platform_options

lib/kamal/commands/builder/remote.rb

@@ -28,7 +28,7 @@ class Kamal::Commands::Builder::Remote < Kamal::Commands::Builder::Base
 
   private
     def builder_name
-      "kamal-remote-#{remote_arch}-#{remote_host.gsub(/[^a-z0-9_-]/, "-")}"
+      "kamal-remote-#{driver}-#{remote_arch}-#{remote_host.gsub(/[^a-z0-9_-]/, "-")}"
     end
 
     def create_remote_context

lib/kamal/configuration/builder.rb

@@ -55,6 +55,10 @@ class Kamal::Configuration::Builder
     builder_config["context"] || "."
   end
 
+  def driver
+    builder_config.fetch("driver", "docker-container")
+  end
+
   def local_arch
     builder_config["local"]["arch"] if local?
   end
@@ -110,6 +114,10 @@ class Kamal::Configuration::Builder
       end
   end
 
+  def docker_driver?
+    driver == "docker"
+  end
+
   private
     def valid?
       if multiarch?
@@ -121,6 +129,10 @@ class Kamal::Configuration::Builder
           raise ArgumentError, "Invalid builder configuration: remote configuration, arch required" unless remote_arch
           raise ArgumentError, "Invalid builder configuration: remote configuration, arch required" unless remote_host
         end
+
+        if docker_driver?
+          raise ArgumentError, "Invalid builder configuration: the docker driver does not support multiarch builds"
+        end
       else
         raise ArgumentError, "Invalid builder configuration: multiarch must be enabled for local configuration" if local?
         raise ArgumentError, "Invalid builder configuration: multiarch must be enabled for remote configuration" if remote?
@@ -128,6 +140,7 @@ class Kamal::Configuration::Builder
 
       if @options["cache"] && @options["cache"]["type"]
         raise ArgumentError, "Invalid cache type: #{@options["cache"]["type"]}" unless [ "gha", "registry" ].include?(@options["cache"]["type"])
+        raise ArgumentError, "The docker driver does not support caching" if docker_driver?
       end
     end
 

lib/kamal/configuration/docs/builder.yml

@@ -18,6 +18,11 @@ builder:
   # Enables multiarch builds, defaults to `true`
   multiarch: false
 
+  # Driver
+  #
+  # The build driver to use, defaults to `docker-container`
+  driver: docker
+
   # Local configuration
   #
   # The build configuration for local builds, only used if multiarch is enabled (the default)

test/integration/docker/deployer/app/config/deploy.yml

@@ -24,6 +24,7 @@ registry:
   password: root
 builder:
   multiarch: false
+  driver: docker
   args:
     COMMIT_SHA: <%= `git rev-parse HEAD` %>
 healthcheck:

test/integration/docker/deployer/app_with_roles/config/deploy.yml

@@ -18,6 +18,7 @@ registry:
   password: root
 builder:
   multiarch: false
+  driver: docker
   args:
     COMMIT_SHA: <%= `git rev-parse HEAD` %>
 healthcheck: