filebuf: remove lockfile upon rename errorscmn/filebuf-rename-error

When we have an error renaming the lockfile, we need to make sure
that we remove it upon cleanup. For this, we need to keep track of
whether we opened the file and whether the rename succeeded.

If we did create the lockfile but the rename did not succeed, we
remove the lockfile. This won't protect against all errors, but
the most common ones (target file is open) does get handled.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/filebuf.c b/src/filebuf.c
index 848ac343b..838f4b4d2 100644
--- a/src/filebuf.c
+++ b/src/filebuf.c
@@ -101,7 +101,7 @@ void git_filebuf_cleanup(git_filebuf *file)
 	if (file->fd_is_open && file->fd >= 0)
 		p_close(file->fd);
 
-	if (file->fd_is_open && file->path_lock && git_path_exists(file->path_lock))
+	if (file->created_lock && !file->did_rename && file->path_lock && git_path_exists(file->path_lock))
 		p_unlink(file->path_lock);
 
 	if (file->compute_digest) {
@@ -258,6 +258,7 @@ int git_filebuf_open(git_filebuf *file, const char *path, int flags, mode_t mode
 			goto cleanup;
 		}
 		file->fd_is_open = true;
+		file->created_lock = true;
 
 		/* No original path */
 		file->path_original = NULL;
@@ -281,6 +282,8 @@ int git_filebuf_open(git_filebuf *file, const char *path, int flags, mode_t mode
 		/* open the file for locking */
 		if ((error = lock_file(file, flags, mode)) < 0)
 			goto cleanup;
+
+		file->created_lock = true;
 	}
 
 	return 0;
@@ -340,6 +343,8 @@ int git_filebuf_commit(git_filebuf *file)
 		goto on_error;
 	}
 
+	file->did_rename = true;
+
 	git_filebuf_cleanup(file);
 	return 0;