refs: add a new function set_worktree_head_symref
Add a new function set_worktree_head_symref, to update HEAD symref for
the specified worktree.
To update HEAD of a linked working tree,
create_symref("worktrees/$work_tree/HEAD", "refs/heads/$branch", msg)
could be used. However when it comes to updating HEAD of the main
working tree, it is unusable because it uses $GIT_DIR for
worktree-specific symrefs (HEAD).
The new function takes git_dir (real directory) as an argument, and
updates HEAD of the working tree. This function will be used when
renaming a branch.
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp>
Acked-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 81f68f8..ec237ef 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2894,6 +2894,41 @@
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 err = STRBUF_INIT;
+ 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) {
+ 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;
