Return 400 but not 500 when request archive with wrong format (#17691) (#17700)

* Return 400 but not 500 when request archive with wrong format (#17691)
* Remove bundle because it's not in this version

services/archiver/archiver.go

@@ -38,6 +38,22 @@ type ArchiveRequest struct {
 // the way to 64.
 var shaRegex = regexp.MustCompile(`^[0-9a-f]{4,64}$`)
 
+// ErrUnknownArchiveFormat request archive format is not supported
+type ErrUnknownArchiveFormat struct {
+	RequestFormat string
+}
+
+// Error implements error
+func (err ErrUnknownArchiveFormat) Error() string {
+	return fmt.Sprintf("unknown format: %s", err.RequestFormat)
+}
+
+// Is implements error
+func (ErrUnknownArchiveFormat) Is(err error) bool {
+	_, ok := err.(ErrUnknownArchiveFormat)
+	return ok
+}
+
 // NewRequest creates an archival request, based on the URI.  The
 // resulting ArchiveRequest is suitable for being passed to ArchiveRepository()
 // if it's determined that the request still needs to be satisfied.
@@ -55,7 +71,7 @@ func NewRequest(repoID int64, repo *git.Repository, uri string) (*ArchiveRequest
 		ext = ".tar.gz"
 		r.Type = git.TARGZ
 	default:
-		return nil, fmt.Errorf("Unknown format: %s", uri)
+		return nil, ErrUnknownArchiveFormat{RequestFormat: uri}
 	}
 
 	r.refName = strings.TrimSuffix(uri, ext)