Merge pull request #4470 from kolyshkin/strings-cut

Use strings.Cut and strings.CutPrefix where possible

libcontainer/utils/utils.go

@@ -77,7 +77,7 @@ func stripRoot(root, path string) string {
 		path = "/"
 	case root == "/":
 		// do nothing
-	case strings.HasPrefix(path, root+"/"):
+	default:
 		path = strings.TrimPrefix(path, root+"/")
 	}
 	return CleanPath("/" + path)
@@ -88,8 +88,8 @@ func stripRoot(root, path string) string {
 func SearchLabels(labels []string, key string) (string, bool) {
 	key += "="
 	for _, s := range labels {
-		if strings.HasPrefix(s, key) {
-			return s[len(key):], true
+		if val, ok := strings.CutPrefix(s, key); ok {
+			return val, true
 		}
 	}
 	return "", false