add path prefix to ObjectStorage.Iterator (#23332)

Support to iterator subdirectory in ObjectStorage for
ObjectStorage.Iterator method.

It's required for https://github.com/go-gitea/gitea/pull/22738 to make
artifact files cleanable.

---------

Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/modules/storage/local.go b/modules/storage/local.go
index 05bf1fb28a..15f5761e8f 100644
--- a/modules/storage/local.go
+++ b/modules/storage/local.go
@@ -127,8 +127,12 @@ func (l *LocalStorage) URL(path, name string) (*url.URL, error) {
 }
 
 // IterateObjects iterates across the objects in the local storage
-func (l *LocalStorage) IterateObjects(fn func(path string, obj Object) error) error {
-	return filepath.WalkDir(l.dir, func(path string, d os.DirEntry, err error) error {
+func (l *LocalStorage) IterateObjects(prefix string, fn func(path string, obj Object) error) error {
+	dir := l.dir
+	if prefix != "" {
+		dir = filepath.Join(l.dir, util.CleanPath(prefix))
+	}
+	return filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
 		if err != nil {
 			return err
 		}