int delete_ref(const char *refname, const unsigned char *sha1)
{
struct ref_lock *lock;
int err, i, ret = 0, flag = 0;
lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
if (!lock)
return 1;
if (!(flag & REF_ISPACKED)) {
/* loose */
i = strlen(lock->lk->filename) - 5; /* .lock */
lock->lk->filename[i] = 0;
err = unlink(lock->lk->filename);
if (err) {
ret = 1;
error("unlink(%s) failed: %s",
lock->lk->filename, strerror(errno));
}
lock->lk->filename[i] = '.';
}
/* removing the loose one could have resurrected an earlier
* packed one. Also, if it was not loose we need to repack
* without it.
*/
ret |= repack_without_ref(refname);
err = unlink(git_path("logs/%s", lock->ref_name));
if (err && errno != ENOENT)
fprintf(stderr, "warning: unlink(%s) failed: %s",
git_path("logs/%s", lock->ref_name), strerror(errno));
invalidate_cached_refs();
unlock_ref(lock);
return ret;
}
struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
{
char refpath[PATH_MAX];
if (check_ref_format(ref))
return NULL;
strcpy(refpath, mkpath("refs/%s", ref));
return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
}
struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
{
switch (check_ref_format(ref)) {
default:
return NULL;
case 0:
case CHECK_REF_FORMAT_ONELEVEL:
return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
}
}
int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
{
struct ref_lock *lock;
int err, i = 0, ret = 0, flag = 0;
lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
if (!lock)
return 1;
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
/* loose */
const char *path;
if (!(delopt & REF_NODEREF)) {
i = strlen(lock->lk->filename) - 5; /* .lock */
lock->lk->filename[i] = 0;
path = lock->lk->filename;
} else {
path = git_path("%s", refname);
}
err = unlink_or_warn(path);
if (err && errno != ENOENT)
ret = 1;
if (!(delopt & REF_NODEREF))
lock->lk->filename[i] = '.';
}
/* removing the loose one could have resurrected an earlier
* packed one. Also, if it was not loose we need to repack
* without it.
*/
ret |= repack_without_ref(refname);
unlink_or_warn(git_path("logs/%s", lock->ref_name));
invalidate_cached_refs();
unlock_ref(lock);
return ret;
}
int rename_ref(const char *oldref, const char *newref, const char *logmsg)
{
static const char renamed_ref[] = "RENAMED-REF";
unsigned char sha1[20], orig_sha1[20];
int flag = 0, logmoved = 0;
struct ref_lock *lock;
struct stat loginfo;
int log = !lstat(git_path("logs/%s", oldref), &loginfo);
const char *symref = NULL;
if (log && S_ISLNK(loginfo.st_mode))
return error("reflog for %s is a symlink", oldref);
symref = resolve_ref(oldref, orig_sha1, 1, &flag);
if (flag & REF_ISSYMREF)
return error("refname %s is a symbolic ref, renaming it is not supported",
oldref);
if (!symref)
return error("refname %s not found", oldref);
if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0))
return 1;
if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
return 1;
lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
if (!lock)
return error("unable to lock %s", renamed_ref);
lock->force_write = 1;
if (write_ref_sha1(lock, orig_sha1, logmsg))
return error("unable to save current sha1 in %s", renamed_ref);
if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
oldref, strerror(errno));
if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
error("unable to delete old %s", oldref);
goto rollback;
}
if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
if (errno==EISDIR) {
if (remove_empty_directories(git_path("%s", newref))) {
error("Directory not empty: %s", newref);
goto rollback;
}
} else {
error("unable to delete existing %s", newref);
goto rollback;
}
}
if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
error("unable to create directory for %s", newref);
goto rollback;
}
retry:
if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
if (errno==EISDIR || errno==ENOTDIR) {
/*
* rename(a, b) when b is an existing
* directory ought to result in ISDIR, but
* Solaris 5.8 gives ENOTDIR. Sheesh.
*/
if (remove_empty_directories(git_path("logs/%s", newref))) {
error("Directory not empty: logs/%s", newref);
goto rollback;
}
goto retry;
} else {
error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
newref, strerror(errno));
goto rollback;
}
}
logmoved = log;
lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for update", newref);
goto rollback;
}
lock->force_write = 1;
hashcpy(lock->old_sha1, orig_sha1);
if (write_ref_sha1(lock, orig_sha1, logmsg)) {
error("unable to write current sha1 into %s", newref);
goto rollback;
}
return 0;
rollback:
lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
if (!lock) {
error("unable to lock %s for rollback", oldref);
goto rollbacklog;
}
lock->force_write = 1;
flag = log_all_ref_updates;
log_all_ref_updates = 0;
if (write_ref_sha1(lock, orig_sha1, NULL))
error("unable to write current sha1 into %s", oldref);
log_all_ref_updates = flag;
rollbacklog:
if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
error("unable to restore logfile %s from %s: %s",
oldref, newref, strerror(errno));
if (!logmoved && log &&
rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
oldref, strerror(errno));
return 1;
}