Change creating boxes for customizing metadata.json

post-processor/vagrant/post-processor.go

@@ -101,6 +101,16 @@ func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (pac
 	}
 	defer os.RemoveAll(dir)
 
+	// Copy all of the includes files into the temporary directory
+	for _, src := range config.Include {
+		ui.Message(fmt.Sprintf("Copying from include: %s", src))
+		dst := filepath.Join(dir, filepath.Base(src))
+		if err := CopyContents(dst, src); err != nil {
+			err = fmt.Errorf("Error copying include file: %s\n\n%s", src, err)
+			return nil, false, err
+		}
+	}
+
 	// Run the provider processing step
 	vagrantfile, metadata, err := provider.Process(ui, artifact, dir)
 	if err != nil {
@@ -112,16 +122,6 @@ func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (pac
 		return nil, false, err
 	}
 
-	// Copy all of the includes files into the temporary directory
-	for _, src := range config.Include {
-		ui.Message(fmt.Sprintf("Copying from include: %s", src))
-		dst := filepath.Join(dir, filepath.Base(src))
-		if err := CopyContents(dst, src); err != nil {
-			err = fmt.Errorf("Error copying include file: %s\n\n%s", src, err)
-			return nil, false, err
-		}
-	}
-
 	// Write our Vagrantfile
 	var customVagrantfile string
 	if config.VagrantfileTemplate != "" {

post-processor/vagrant/util.go

@@ -130,12 +130,15 @@ func DirToBox(dst, dir string, ui packer.Ui, level int) error {
 
 // WriteMetadata writes the "metadata.json" file for a Vagrant box.
 func WriteMetadata(dir string, contents interface{}) error {
-	f, err := os.Create(filepath.Join(dir, "metadata.json"))
-	if err != nil {
-		return err
-	}
-	defer f.Close()
+	if _, err := os.Stat(filepath.Join(dir, "metadata.json")); os.IsNotExist(err) {
+		f, err := os.Create(filepath.Join(dir, "metadata.json"))
+		if err != nil {
+			return err
+		}
+		defer f.Close()
 
-	enc := json.NewEncoder(f)
-	return enc.Encode(contents)
+		enc := json.NewEncoder(f)
+		return enc.Encode(contents)
+	}
+	return nil
 }