Add working_direcotory

Author: hatappi

README.md

@@ -33,3 +33,5 @@ sample is [here](./sample)
 - mitamae_version (string) : MItamae version. By default this is v1.4.5.
 - bin_dir (string) : bin_dir is is the path to download MItamae. By default this is `/usr/local/bin`
 - option (string) : It is an option when execute `mitamae local`. For example '-l debug'
+- working_directory (string): specify the directory at runtime.
+

mitamae_provisioner.go

@@ -26,6 +26,8 @@ type Config struct {
 
 	RecipePath string `mapstructure:"recipe_path"`
 
+	WorkingDirectory string `mapstructure:"working_directory"`
+
 	ctx interpolate.Context
 }
 
@@ -136,7 +138,11 @@ func (mp *MitamaeProvisioner) execRecipe(ui packer.Ui, comm packer.Communicator,
 	binPath := fmt.Sprintf("%s/%s", mp.config.BinDir, filename)
 
 	var cmd packer.RemoteCmd
-	cmd.Command = fmt.Sprintf("%s local %s %s", binPath, mp.config.Option, mp.config.RecipePath)
+	command := fmt.Sprintf("%s local %s %s", binPath, mp.config.Option, mp.config.RecipePath)
+	if mp.config.WorkingDirectory != "" {
+		command = fmt.Sprintf("cd %s && ", mp.config.WorkingDirectory) + command
+	}
+	cmd.Command = command
 	if err := cmd.StartWithUi(comm, ui); err != nil {
 		return err
 	}