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ref locking: allow 'foo' when 'foo/bar' used to exist but not anymore.

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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 <junkio@cox.net>
This commit is contained in:
Junio C Hamano
2006-09-30 02:25:30 -07:00
parent fc12f0829d
commit bc7127ef0f
1 changed files with 64 additions and 0 deletions
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64
refs.c
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@ -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",