Fix copy from a "created" container. Fixes #14420

Signed-off-by: Lei Jitang <leijitang@huawei.com>

fileutils/fileutils.go

@@ -167,3 +167,23 @@ func ReadSymlinkedDirectory(path string) (string, error) {
 	}
 	return realPath, nil
 }
+
+// CreateIfNotExists creates a file or a directory only if it does not already exist.
+func CreateIfNotExists(path string, isDir bool) error {
+	if _, err := os.Stat(path); err != nil {
+		if os.IsNotExist(err) {
+			if isDir {
+				return os.MkdirAll(path, 0755)
+			}
+			if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
+				return err
+			}
+			f, err := os.OpenFile(path, os.O_CREATE, 0755)
+			if err != nil {
+				return err
+			}
+			f.Close()
+		}
+	}
+	return nil
+}