post-processor/compress: Boilerplate for the compress PP

config.go

@@ -30,6 +30,10 @@ const defaultConfig = `
 		"validate": "packer-command-validate"
 	},
 
+	"post-processors": {
+		"compress": "packer-post-processor-compress"
+	},
+
 	"provisioners": {
 		"shell": "packer-provisioner-shell"
 	}

plugin/post-processor-compress/main.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"github.com/mitchellh/packer/post-processor/compress"
+	"github.com/mitchellh/packer/packer/plugin"
+)
+
+func main() {
+	plugin.ServePostProcessor(new(compress.PostProcessor))
+}

post-processor/compress/post-processor.go

@@ -0,0 +1,38 @@
+// compress implements the packer.PostProcessor interface and adds a
+// post-processor for compressing output.
+package compress
+
+import (
+	"errors"
+	"github.com/mitchellh/packer/packer"
+	"github.com/mitchellh/mapstructure"
+)
+
+type Config struct {
+	Format 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.Format == "" {
+		p.config.Format = "tar.gz"
+	}
+
+	if p.config.Format != "tar.gz" {
+		return errors.New("only 'tar.gz' is a supported format right now")
+	}
+
+	return nil
+}
+
+func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, error) {
+	ui.Say("We made it to here.")
+	return nil, nil
+}