Do some forward porting of the old work of

mitchellh/packer's docker branch. hashicorp#774

config.go

@@ -42,7 +42,8 @@ const defaultConfig = `
 
 	"post-processors": {
 		"vagrant": "packer-post-processor-vagrant",
-		"vsphere": "packer-post-processor-vsphere"
+		"vsphere": "packer-post-processor-vsphere",
+                "docker": "packer-post-processor-docker"
 	},
 
 	"provisioners": {

plugin/post-processor-docker/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"github.com/mitchellh/packer/packer/plugin"
+	"github.com/mitchellh/packer/post-processor/docker"
+)
+
+func main() {
+	server, err := plugin.Server()
+	if err != nil {
+		panic(err)
+	}
+	server.RegisterPostProcessor(new(docker.PostProcessor))
+	server.Serve()
+}

plugin/post-processor-docker/main_test.go

@@ -0,0 +1 @@
+package main

post-processor/docker/post-processor.go

@@ -0,0 +1,56 @@
+package docker
+
+import (
+	"bytes"
+	"errors"
+	"github.com/mitchellh/mapstructure"
+	"github.com/mitchellh/packer/packer"
+	"os/exec"
+)
+
+type Config struct {
+	Registry string
+	Username string
+	Password string
+	Email    string
+}
+
+type PostProcessor struct {
+	config Config
+}
+
+func (p *PostProcessor) Configure(raw ...interface{}) error {
+	if err := mapstructure.Decode(raw, &p.config); err != nil {
+		return err
+	}
+
+	if p.config.Registry == "" {
+		p.config.Registry = "registry.docker.io"
+	}
+
+	if p.config.Username == "" {
+		return errors.New("Username is required to push docker image")
+	}
+
+	if p.config.Password == "" {
+		return errors.New("Password is required to push docker image")
+	}
+
+	return nil
+}
+func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
+	id := artifact.Id()
+	ui.Say("Pushing imgage: " + id)
+
+	// TODO: docker login
+
+	stdout := new(bytes.Buffer)
+	cmd := exec.Command("docker", "push", id)
+	cmd.Stdout = stdout
+	if err := cmd.Run(); err != nil {
+		ui.Say("Failed to push image: " + id)
+		return nil, true, err
+	}
+
+	return nil, true, nil
+}