Function repair_worktree_at_path

worktree.c:820–927

* Repair /worktrees/ /gitdir if missing, corrupt, or not pointing at * the worktree's path. */

 * the worktree's path.
 */
void repair_worktree_at_path(const char *path,
			     worktree_repair_fn fn, void *cb_data,
			     int use_relative_paths)
{
	struct strbuf dotgit = STRBUF_INIT;
	struct strbuf backlink = STRBUF_INIT;
	struct strbuf inferred_backlink = STRBUF_INIT;
	struct strbuf gitdir = STRBUF_INIT;
	struct strbuf olddotgit = STRBUF_INIT;
	char *dotgit_contents = NULL;
	const char *repair = NULL;
	int err;

	if (!fn)
		fn = repair_noop;

	if (is_main_worktree_path(path))
		goto done;

	strbuf_addf(&dotgit, "%s/.git", path);
	if (!strbuf_realpath(&dotgit, dotgit.buf, 0)) {
		fn(1, path, _("not a valid path"), cb_data);
		goto done;
	}

	infer_backlink(dotgit.buf, &inferred_backlink);
	strbuf_realpath_forgiving(&inferred_backlink, inferred_backlink.buf, 0);
	dotgit_contents = xstrdup_or_null(read_gitfile_gently(dotgit.buf, &err));
	if (dotgit_contents) {
		if (is_absolute_path(dotgit_contents)) {
			strbuf_addstr(&backlink, dotgit_contents);
		} else {
			strbuf_addbuf(&backlink, &dotgit);
			strbuf_strip_suffix(&backlink, ".git");
			strbuf_addstr(&backlink, dotgit_contents);
			strbuf_realpath_forgiving(&backlink, backlink.buf, 0);
		}
	} else if (err == READ_GITFILE_ERR_NOT_A_FILE ||
			err == READ_GITFILE_ERR_IS_A_DIR) {
		fn(1, dotgit.buf, _("unable to locate repository; .git is not a file"), cb_data);
		goto done;
	} else if (err == READ_GITFILE_ERR_NOT_A_REPO) {
		if (inferred_backlink.len) {
			/*
			 * Worktree's .git file does not point at a repository
			 * but we found a .git/worktrees/<id> in this
			 * repository with the same <id> as recorded in the
			 * worktree's .git file so make the worktree point at
			 * the discovered .git/worktrees/<id>.
			 */
			strbuf_swap(&backlink, &inferred_backlink);
		} else {
			fn(1, dotgit.buf, _("unable to locate repository; .git file does not reference a repository"), cb_data);
			goto done;
		}
	} else {
		fn(1, dotgit.buf, _("unable to locate repository; .git file broken"), cb_data);
		goto done;