chore: remove useless code

cmd/image-syncer.go

@@ -11,7 +11,7 @@ import (
 )
 
 var (
-	logPath, configFile, authFile, imageFile, defaultRegistry, defaultNamespace string
+	logPath, configFile, authFile, imageFile, defaultRegistry string
 
 	procNum, retries int
 
@@ -50,8 +50,6 @@ func init() {
 	RootCmd.PersistentFlags().StringVar(&logPath, "log", "", "log file path (default in os.Stderr)")
 	RootCmd.PersistentFlags().StringVar(&defaultRegistry, "registry", os.Getenv("DEFAULT_REGISTRY"),
 		"default destination registry url when destination registry is not given in the config file, can also be set with DEFAULT_REGISTRY environment value")
-	RootCmd.PersistentFlags().StringVar(&defaultNamespace, "namespace", os.Getenv("DEFAULT_NAMESPACE"),
-		"default destination namespace when destination namespace is not given in the config file, can also be set with DEFAULT_NAMESPACE environment value")
 	RootCmd.PersistentFlags().IntVarP(&procNum, "proc", "p", 5, "numbers of working goroutines")
 	RootCmd.PersistentFlags().IntVarP(&retries, "retries", "r", 2, "times to retry failed task")
 	RootCmd.PersistentFlags().StringArrayVar(&osFilterList, "os", []string{}, "os list to filter source tags, not works for docker v2 schema1 and OCI media")

pkg/client/config.go

@@ -25,7 +25,7 @@ type Config struct {
 	// only images with selected architecture can be sync
 	archFilterList []string
 
-	// If the destination registry and namespace is not provided,
+	// If the destination is not provided,
 	// the source image will be synchronized to defaultDestRegistry with origin repo name and tag.
 	defaultDestRegistry string
 }

pkg/task/rule.go

@@ -47,7 +47,7 @@ func (r *RuleTask) Run() ([]Task, string, error) {
 			r.destination = r.defaultDestRegistry + "/" +
 				sourceURLs[0].GetRepo()
 		} else {
-			return nil, "", fmt.Errorf("the default registry and namespace should not be nil if you want to use them")
+			return nil, "", fmt.Errorf("the default registry should not be nil if you want to use them")
 		}
 	}