Function lock_worktree

builtin/worktree.c:1133–1170

}

static int lock_worktree(int ac, const char **av, const char *prefix,
			 struct repository *repo UNUSED)
{
	const char *reason = "", *old_reason;
	struct option options[] = {
		OPT_STRING(0, "reason", &reason, N_("string"),
			   N_("reason for locking")),
		OPT_END()
	};
	struct worktree **worktrees, *wt;
	char *path;

	ac = parse_options(ac, av, prefix, options, git_worktree_lock_usage, 0);
	if (ac != 1)
		usage_with_options(git_worktree_lock_usage, options);

	worktrees = get_worktrees();
	wt = find_worktree(worktrees, prefix, av[0]);
	if (!wt)
		die(_("'%s' is not a working tree"), av[0]);
	if (is_main_worktree(wt))
		die(_("The main working tree cannot be locked or unlocked"));

	old_reason = worktree_lock_reason(wt);
	if (old_reason) {
		if (*old_reason)
			die(_("'%s' is already locked, reason: %s"),
			    av[0], old_reason);
		die(_("'%s' is already locked"), av[0]);
	}

	path = repo_common_path(the_repository, "worktrees/%s/locked", wt->id);
	write_file(path, "%s", reason);

	free_worktrees(worktrees);
	free(path);
	return 0;
}

static int unlock_worktree(int ac, const char **av, const char *prefix,
			   struct repository *repo UNUSED)