snapshot of https://github.com/go-gitea/gitea.git (main, 2026-09-15; blobs > 131072B omitted)

modules/util/file_retry.go

@@ -0,0 +1,60 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package util
+
+import (
+	"errors"
+	"os"
+	"syscall"
+	"time"
+)
+
+// On Windows, when a file or directory is in use (opened), the file or directory is not able to be removed or renamed.
+// When renaming or removing a local git repository directory:
+// * the "cat-batch" git process might be running in a goroutine
+// * there can be a data-race between the "cat-batch" git process cancel+exit and the repo rename
+// So we need to retry the rename/remove operation for a few times when the "cat-batch" git process is exiting.
+// ref: https://github.com/go-gitea/gitea/issues/16427, https://github.com/go-gitea/gitea/issues/16475, https://github.com/go-gitea/gitea/pull/16479
+// Also some similar problems when removing a file, e.g.: https://github.com/go-gitea/gitea/issues/12339
+//
+// Usually, if no concurrent access to a file, use "os.Xxx", otherwise, use "util.XxxWithRetry"
+
+func retryWhenFileBusyInternal(count int, delay time.Duration, f func() error) (err error) {
+	const errWindowsSharingViolationError = syscall.Errno(32)
+	for range count {
+		err = f()
+		if err == nil {
+			break
+		}
+		isErrBusy := errors.Is(err, syscall.EBUSY) || errors.Is(err, syscall.ENOTEMPTY) || errors.Is(err, syscall.EPERM) || errors.Is(err, syscall.EMFILE) || errors.Is(err, syscall.ENFILE)
+		isErrBusy = isErrBusy || (isOSWindows && errors.Is(err, errWindowsSharingViolationError))
+		if !isErrBusy {
+			break
+		}
+		time.Sleep(delay)
+	}
+	return err
+}
+
+func retryWhenFileBusy(f func() error) (err error) {
+	return retryWhenFileBusyInternal(5, 100*time.Millisecond, f)
+}
+
+func RemoveWithRetry(path string) error {
+	return retryWhenFileBusy(func() error {
+		return os.Remove(path)
+	})
+}
+
+func RemoveAllWithRetry(path string) error {
+	return retryWhenFileBusy(func() error {
+		return os.RemoveAll(path)
+	})
+}
+
+func RenameWithRetry(oldpath, newpath string) error {
+	return retryWhenFileBusy(func() error {
+		return os.Rename(oldpath, newpath)
+	})
+}