Supporting a named Dockerfile for Docker 1.5.0

plugins/providers/docker/action/build.rb

@@ -38,10 +38,22 @@ module VagrantPlugins
           # If we have no image or we're rebuilding, we rebuild
           if !image || env[:build_rebuild]
             # Build it
-            machine.ui.output(I18n.t("docker_provider.building"))
+            args = machine.provider_config.build_args.clone
+            if (machine.provider_config.dockerfile)
+              dockerfile      = machine.provider_config.dockerfile
+              dockerfile_path = File.join(build_dir, dockerfile)
+
+              args.push "--file=\"#{dockerfile_path}\""
+              machine.ui.output(
+                I18n.t("docker_provider.building_named_dockerfile",
+                file: machine.provider_config.dockerfile))
+            else
+              machine.ui.output(I18n.t("docker_provider.building"))
+            end
+
             image = machine.provider.driver.build(
               build_dir,
-              extra_args: machine.provider_config.build_args) do |type, data|
+              extra_args: args) do |type, data|
               data = remove_ansi_escape_codes(data.chomp).chomp
               env[:ui].detail(data) if data != ""
             end

plugins/providers/docker/config.rb

@@ -17,6 +17,12 @@ module VagrantPlugins
       # @return [String]
       attr_accessor :build_dir
 
+      # An optional file name of a Dockerfile to be used when building
+      # the image. This requires Docker >1.5.0.
+      #
+      # @return [String]
+      attr_accessor :dockerfile
+
       # Additional arguments to pass to `docker run` when creating
       # the container for the first time. This is an array of args.
       #

templates/locales/providers_docker.yml

@@ -12,6 +12,8 @@ en:
       Build image no longer exists. Rebuilding...
     building: |-
       Building the container from a Dockerfile...
+    building_named_dockerfile: |-
+      Building the container from the named Dockerfile: %{file}...
     creating: |-
       Creating the container...
     created: |-