cli: add config rm command

Signed-off-by: Jérôme Jutteau <[email protected]>

cmd/frieza/cli_config.go

@@ -11,7 +11,8 @@ import (
 func cliConfig() cli.Command {
 	return cli.NewCommand("config", "configure frieza options").
 		WithCommand(cliConfigLs()).
-		WithCommand(cliConfigSet())
+		WithCommand(cliConfigSet()).
+		WithCommand(cliConfigRm())
 }
 
 func cliConfigLs() cli.Command {
@@ -35,6 +36,17 @@ func cliConfigSet() cli.Command {
 		})
 }
 
+func cliConfigRm() cli.Command {
+	return cli.NewCommand("remove", "delete a specific option (reset to default value)").
+		WithShortcut("rm").
+		WithOption(cliConfigPath()).
+		WithArg(cli.NewArg("option_name", "option's name to remove/unset")).
+		WithAction(func(args []string, options map[string]string) int {
+			configRm(options["config"], &args[0])
+			return 0
+		})
+}
+
 func configLs(customConfigPath string) {
 	var configPath *string
 	if len(customConfigPath) > 0 {
@@ -71,3 +83,23 @@ func configSet(customConfigPath string, optionName *string, optionValue *string)
 		log.Fatalf("Cannot save configuration file: %s", err.Error())
 	}
 }
+
+func configRm(customConfigPath string, optionName *string) {
+	var configPath *string
+	if len(customConfigPath) > 0 {
+		configPath = &customConfigPath
+	}
+	config, err := ConfigLoadWithDefault(configPath)
+	if err != nil {
+		log.Fatal("Cannot load configuration: " + err.Error())
+	}
+	switch *optionName {
+	case "snapshot_folder_path":
+		config.SnapshotFolderPath = ""
+	default:
+		log.Fatalf("Unknow option name")
+	}
+	if err = config.Write(configPath); err != nil {
+		log.Fatalf("Cannot save configuration file: %s", err.Error())
+	}
+}