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-rw-r--r--refs/files-backend.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 81f68f846b..ea78ce9d90 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2894,6 +2894,42 @@ int create_symref(const char *refname, const char *target, const char *logmsg)
return ret;
}
+int set_worktree_head_symref(const char *gitdir, const char *target)
+{
+ static struct lock_file head_lock;
+ struct ref_lock *lock;
+ struct strbuf head_path = STRBUF_INIT;
+ const char *head_rel;
+ int ret;
+
+ strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir));
+ if (hold_lock_file_for_update(&head_lock, head_path.buf,
+ LOCK_NO_DEREF) < 0) {
+ struct strbuf err = STRBUF_INIT;
+ unable_to_lock_message(head_path.buf, errno, &err);
+ error("%s", err.buf);
+ strbuf_release(&err);
+ strbuf_release(&head_path);
+ return -1;
+ }
+
+ /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
+ linked trees */
+ head_rel = remove_leading_path(head_path.buf,
+ absolute_path(get_git_common_dir()));
+ /* to make use of create_symref_locked(), initialize ref_lock */
+ lock = xcalloc(1, sizeof(struct ref_lock));
+ lock->lk = &head_lock;
+ lock->ref_name = xstrdup(head_rel);
+ lock->orig_ref_name = xstrdup(head_rel);
+
+ ret = create_symref_locked(lock, head_rel, target, NULL);
+
+ unlock_ref(lock); /* will free lock */
+ strbuf_release(&head_path);
+ return ret;
+}
+
int reflog_exists(const char *refname)
{
struct stat st;