Add option to Docker provisioner to build local images

plugins/provisioners/docker/config.rb

@@ -3,13 +3,14 @@ require 'set'
 module VagrantPlugins
   module Docker
     class Config < Vagrant.plugin("2", :config)
-      attr_reader :images, :containers
+      attr_reader :images, :containers, :build_options
       attr_accessor :version
 
       def initialize
-        @images     = Set.new
-        @containers = Hash.new
-        @version    = UNSET_VALUE
+        @images         = Set.new
+        @containers     = Hash.new
+        @version        = UNSET_VALUE
+        @build_images   = []
       end
 
       def images=(images)
@@ -20,6 +21,14 @@ module VagrantPlugins
         @images += images.map(&:to_s)
       end
 
+      def build_images(*images)
+        possible_options = @build_options.keys
+
+        @build_images = images.map do |image|
+          image.values_at(:path, :args)
+        end
+      end
+
       def run(name, **options)
         params = options.dup
         params[:image] ||= name

plugins/provisioners/docker/docker_client.rb

@@ -16,6 +16,16 @@ module VagrantPlugins
         end
       end
 
+      def build_images(images)
+        @machine.communicate.tap do |comm|
+          images.each do |image|
+            path = image[:path]
+            @machine.ui.info(I18n.t("vagrant.docker_building_single", path: path))
+            comm.sudo("docker build #{image[:args]} #{path}")
+          end
+        end
+      end
+
       def start_service
         if !daemon_running? && @machine.guest.capability?(:docker_start_service)
           @machine.guest.capability(:docker_start_service)

plugins/provisioners/docker/provisioner.rb

@@ -33,6 +33,11 @@ module VagrantPlugins
           @client.pull_images(*config.images)
         end
 
+        if config.build_images.any?
+          @machine.ui.info(I18n.t("vagrant.docker_building_images"))
+          @client.build_images(config.build_images)
+        end
+
         if config.containers.any?
           @machine.ui.info(I18n.t("vagrant.docker_starting_containers"))
           @client.run(config.containers)

templates/locales/en.yml

@@ -48,6 +48,8 @@ en:
       Pulling Docker images...
     docker_pulling_single: |-
       -- Image: %{name}
+    docker_building_single: |-
+      -- Path: %{path}
     docker_running: |-
       -- Container: %{name}
     docker_starting_containers: