Add a -message option to pushes

command/push.go

@@ -33,10 +33,12 @@ type pushUploadFn func(
 
 func (c *PushCommand) Run(args []string) int {
 	var token string
+	var message string
 
 	f := flag.NewFlagSet("push", flag.ContinueOnError)
 	f.Usage = func() { c.Ui.Error(c.Help()) }
 	f.StringVar(&token, "token", "", "token")
+	f.StringVar(&message, "message", "", "message")
 	if err := f.Parse(args); err != nil {
 		return 1
 	}
@@ -222,8 +224,10 @@ Usage: packer push [options] TEMPLATE
 
 Options:
 
-  -token=<token>      Access token to use to upload. If blank, the
-                      ATLAS_TOKEN environmental variable will be used.
+  -message=<detail>    A message to identify the purpose or changes in this
+                       Packer template much like a VCS commit message
+
+  -token=<token>       The access token to use to when uploading
 `
 
 	return strings.TrimSpace(helpText)