From bc7127ef0f81d996e9691c6c898b926867aae89f Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sat, 30 Sep 2006 02:25:30 -0700 Subject: [PATCH] ref locking: allow 'foo' when 'foo/bar' used to exist but not anymore. It is normal to have .git/refs/heads/foo directory which is empty after the last branch whose name starts with foo/ is removed. Make sure we notice this case and allow creation of branch foo by removing the empty directory. Signed-off-by: Junio C Hamano --- refs.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/refs.c b/refs.c index 3d4cdd1eb..b433c0c2d 100644 --- a/refs.c +++ b/refs.c @@ -473,6 +473,59 @@ static struct ref_lock *verify_lock(struct ref_lock *lock, return lock; } +static int remove_empty_dir_recursive(char *path, int len) +{ + DIR *dir = opendir(path); + struct dirent *e; + int ret = 0; + + if (!dir) + return -1; + if (path[len-1] != '/') + path[len++] = '/'; + while ((e = readdir(dir)) != NULL) { + struct stat st; + int namlen; + if ((e->d_name[0] == '.') && + ((e->d_name[1] == 0) || + ((e->d_name[1] == '.') && e->d_name[2] == 0))) + continue; /* "." and ".." */ + + namlen = strlen(e->d_name); + if ((len + namlen < PATH_MAX) && + strcpy(path + len, e->d_name) && + !lstat(path, &st) && + S_ISDIR(st.st_mode) && + remove_empty_dir_recursive(path, len + namlen)) + continue; /* happy */ + + /* path too long, stat fails, or non-directory still exists */ + ret = -1; + break; + } + closedir(dir); + if (!ret) { + path[len] = 0; + ret = rmdir(path); + } + return ret; +} + +static int remove_empty_directories(char *file) +{ + /* we want to create a file but there is a directory there; + * if that is an empty directory (or a directory that contains + * only empty directories), remove them. + */ + char path[PATH_MAX]; + int len = strlen(file); + + if (len >= PATH_MAX) /* path too long ;-) */ + return -1; + strcpy(path, file); + return remove_empty_dir_recursive(path, len); +} + static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1) { char *ref_file; @@ -485,6 +538,17 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char lock->lock_fd = -1; ref = resolve_ref(ref, lock->old_sha1, mustexist, NULL); + if (!ref && errno == EISDIR) { + /* we are trying to lock foo but we used to + * have foo/bar which now does not exist; + * it is normal for the empty directory 'foo' + * to remain. + */ + ref_file = git_path("%s", orig_ref); + if (remove_empty_directories(ref_file)) + die("there are still refs under '%s'", orig_ref); + ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, NULL); + } if (!ref) { int last_errno = errno; error("unable to resolve reference %s: %s", -- 2.30.2