Example #1
0
static void update_common_dir(struct strbuf *buf, int git_dir_len)
{
	char *base = buf->buf + git_dir_len;
	const char **p;

	if (is_dir_file(base, "logs", "HEAD"))
		return;	/* keep this in $GIT_DIR */
	for (p = common_list; *p; p++) {
		const char *path = *p;
		int is_dir = 0;
		if (*path == '!')
			path++;
		if (*path == '/') {
			path++;
			is_dir = 1;
		}
		if (is_dir && dir_prefix(base, path)) {
			replace_dir(buf, git_dir_len, get_git_common_dir());
			return;
		}
		if (!is_dir && !strcmp(base, path)) {
			replace_dir(buf, git_dir_len, get_git_common_dir());
			return;
		}
	}
}
Example #2
0
File: worktree.c Project: j6t/git
/**
 * get the main worktree
 */
static struct worktree *get_main_worktree(void)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;
	struct strbuf head_ref = STRBUF_INIT;
	int is_bare = 0;
	int is_detached = 0;

	strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
	is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
	if (is_bare)
		strbuf_strip_suffix(&worktree_path, "/.");

	strbuf_addf(&path, "%s/HEAD", get_git_common_dir());

	worktree = xcalloc(1, sizeof(*worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->is_bare = is_bare;
	worktree->is_detached = is_detached;
	if (!parse_ref(path.buf, &head_ref, &is_detached))
		add_head_info(&head_ref, worktree);

	strbuf_release(&path);
	strbuf_release(&worktree_path);
	strbuf_release(&head_ref);
	return worktree;
}
Example #3
0
File: branch.c Project: 2quala/git
static char *find_linked_symref(const char *symref, const char *branch,
				const char *id)
{
	struct strbuf sb = STRBUF_INIT;
	struct strbuf path = STRBUF_INIT;
	struct strbuf gitdir = STRBUF_INIT;
	char *existing = NULL;

	/*
	 * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside
	 * $GIT_DIR so resolve_ref_unsafe() won't work (it uses
	 * git_path). Parse the ref ourselves.
	 */
	if (id)
		strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(), id, symref);
	else
		strbuf_addf(&path, "%s/%s", get_git_common_dir(), symref);

	if (!strbuf_readlink(&sb, path.buf, 0)) {
		if (!starts_with(sb.buf, "refs/") ||
		    check_refname_format(sb.buf, 0))
			goto done;
	} else if (strbuf_read_file(&sb, path.buf, 0) >= 0 &&
	    starts_with(sb.buf, "ref:")) {
		strbuf_remove(&sb, 0, strlen("ref:"));
		strbuf_trim(&sb);
	} else
		goto done;
	if (strcmp(sb.buf, branch))
		goto done;
	if (id) {
		strbuf_reset(&path);
		strbuf_addf(&path, "%s/worktrees/%s/gitdir", get_git_common_dir(), id);
		if (strbuf_read_file(&gitdir, path.buf, 0) <= 0)
			goto done;
		strbuf_rtrim(&gitdir);
	} else
		strbuf_addstr(&gitdir, get_git_common_dir());
	strbuf_strip_suffix(&gitdir, ".git");

	existing = strbuf_detach(&gitdir, NULL);
done:
	strbuf_release(&path);
	strbuf_release(&sb);
	strbuf_release(&gitdir);

	return existing;
}
Example #4
0
static struct worktree *get_linked_worktree(const char *id)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;

	if (!id)
		die("Missing linked worktree name");

	strbuf_git_common_path(&path, the_repository, "worktrees/%s/gitdir", id);
	if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
		/* invalid gitdir file */
		goto done;

	strbuf_rtrim(&worktree_path);
	if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
		strbuf_reset(&worktree_path);
		strbuf_add_absolute_path(&worktree_path, ".");
		strbuf_strip_suffix(&worktree_path, "/.");
	}

	strbuf_reset(&path);
	strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);

	worktree = xcalloc(1, sizeof(*worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->id = xstrdup(id);
	add_head_info(worktree);

done:
	strbuf_release(&path);
	strbuf_release(&worktree_path);
	return worktree;
}
Example #5
0
File: branch.c Project: 2quala/git
char *find_shared_symref(const char *symref, const char *target)
{
	struct strbuf path = STRBUF_INIT;
	DIR *dir;
	struct dirent *d;
	char *existing;

	if ((existing = find_linked_symref(symref, target, NULL)))
		return existing;

	strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
	dir = opendir(path.buf);
	strbuf_release(&path);
	if (!dir)
		return NULL;

	while ((d = readdir(dir)) != NULL) {
		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
			continue;
		existing = find_linked_symref(symref, target, d->d_name);
		if (existing)
			goto done;
	}
done:
	closedir(dir);

	return existing;
}
Example #6
0
static void copy_templates(const char *template_dir)
{
	struct strbuf path = STRBUF_INIT;
	struct strbuf template_path = STRBUF_INIT;
	size_t template_len;
	struct repository_format template_format = REPOSITORY_FORMAT_INIT;
	struct strbuf err = STRBUF_INIT;
	DIR *dir;
	char *to_free = NULL;

	if (!template_dir)
		template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
	if (!template_dir)
		template_dir = init_db_template_dir;
	if (!template_dir)
		template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
	if (!template_dir[0]) {
		free(to_free);
		return;
	}

	strbuf_addstr(&template_path, template_dir);
	strbuf_complete(&template_path, '/');
	template_len = template_path.len;

	dir = opendir(template_path.buf);
	if (!dir) {
		warning(_("templates not found in %s"), template_dir);
		goto free_return;
	}

	/* Make sure that template is from the correct vintage */
	strbuf_addstr(&template_path, "config");
	read_repository_format(&template_format, template_path.buf);
	strbuf_setlen(&template_path, template_len);

	/*
	 * No mention of version at all is OK, but anything else should be
	 * verified.
	 */
	if (template_format.version >= 0 &&
	    verify_repository_format(&template_format, &err) < 0) {
		warning(_("not copying templates from '%s': %s"),
			  template_dir, err.buf);
		strbuf_release(&err);
		goto close_free_return;
	}

	strbuf_addstr(&path, get_git_common_dir());
	strbuf_complete(&path, '/');
	copy_templates_1(&path, &template_path, dir);
close_free_return:
	closedir(dir);
free_return:
	free(to_free);
	strbuf_release(&path);
	strbuf_release(&template_path);
	clear_repository_format(&template_format);
}
Example #7
0
const char *get_worktree_git_dir(const struct worktree *wt)
{
	if (!wt)
		return get_git_dir();
	else if (!wt->id)
		return get_git_common_dir();
	else
		return git_common_path("worktrees/%s", wt->id);
}
Example #8
0
static void do_git_common_path(struct strbuf *buf,
			       const char *fmt,
			       va_list args)
{
	strbuf_addstr(buf, get_git_common_dir());
	if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
		strbuf_addch(buf, '/');
	strbuf_vaddf(buf, fmt, args);
	strbuf_cleanup_path(buf);
}
Example #9
0
static void update_common_dir(struct strbuf *buf, int git_dir_len,
			      const char *common_dir)
{
	char *base = buf->buf + git_dir_len;
	init_common_trie();
	if (!common_dir)
		common_dir = get_git_common_dir();
	if (trie_find(&common_trie, base, check_common, NULL) > 0)
		replace_dir(buf, git_dir_len, common_dir);
}
Example #10
0
File: worktree.c Project: 9b/git
/**
 * get the main worktree
 */
static struct worktree *get_main_worktree(void)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;
	struct strbuf head_ref = STRBUF_INIT;
	int is_bare = 0;
	int is_detached = 0;

	strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
	is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
	if (is_bare)
		strbuf_strip_suffix(&worktree_path, "/.");

	strbuf_addf(&path, "%s/HEAD", get_git_common_dir());

	if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
		goto done;

	worktree = xmalloc(sizeof(struct worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->id = NULL;
	worktree->is_bare = is_bare;
	worktree->head_ref = NULL;
	worktree->is_detached = is_detached;
	worktree->is_current = 0;
	add_head_info(&head_ref, worktree);
	worktree->lock_reason = NULL;
	worktree->lock_reason_valid = 0;

done:
	strbuf_release(&path);
	strbuf_release(&worktree_path);
	strbuf_release(&head_ref);
	return worktree;
}
Example #11
0
File: worktree.c Project: 9b/git
static struct worktree *get_linked_worktree(const char *id)
{
	struct worktree *worktree = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf worktree_path = STRBUF_INIT;
	struct strbuf head_ref = STRBUF_INIT;
	int is_detached = 0;

	if (!id)
		die("Missing linked worktree name");

	strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
	if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
		/* invalid gitdir file */
		goto done;

	strbuf_rtrim(&worktree_path);
	if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
		strbuf_reset(&worktree_path);
		strbuf_add_absolute_path(&worktree_path, ".");
		strbuf_strip_suffix(&worktree_path, "/.");
	}

	strbuf_reset(&path);
	strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);

	if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
		goto done;

	worktree = xmalloc(sizeof(struct worktree));
	worktree->path = strbuf_detach(&worktree_path, NULL);
	worktree->id = xstrdup(id);
	worktree->is_bare = 0;
	worktree->head_ref = NULL;
	worktree->is_detached = is_detached;
	worktree->is_current = 0;
	add_head_info(&head_ref, worktree);
	worktree->lock_reason = NULL;
	worktree->lock_reason_valid = 0;

done:
	strbuf_release(&path);
	strbuf_release(&worktree_path);
	strbuf_release(&head_ref);
	return worktree;
}
Example #12
0
int cmd_rev_parse(int argc, const char **argv, const char *prefix)
{
	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
	int did_repo_setup = 0;
	int has_dashdash = 0;
	int output_prefix = 0;
	unsigned char sha1[20];
	unsigned int flags = 0;
	const char *name = NULL;
	struct object_context unused;

	if (argc > 1 && !strcmp("--parseopt", argv[1]))
		return cmd_parseopt(argc - 1, argv + 1, prefix);

	if (argc > 1 && !strcmp("--sq-quote", argv[1]))
		return cmd_sq_quote(argc - 2, argv + 2);

	if (argc > 1 && !strcmp("-h", argv[1]))
		usage(builtin_rev_parse_usage);

	for (i = 1; i < argc; i++) {
		if (!strcmp(argv[i], "--")) {
			has_dashdash = 1;
			break;
		}
	}

	/* No options; just report on whether we're in a git repo or not. */
	if (argc == 1) {
		setup_git_directory();
		git_config(git_default_config, NULL);
		return 0;
	}

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];

		if (!strcmp(arg, "--local-env-vars")) {
			int i;
			for (i = 0; local_repo_env[i]; i++)
				printf("%s\n", local_repo_env[i]);
			continue;
		}
		if (!strcmp(arg, "--resolve-git-dir")) {
			const char *gitdir = argv[++i];
			if (!gitdir)
				die("--resolve-git-dir requires an argument");
			gitdir = resolve_gitdir(gitdir);
			if (!gitdir)
				die("not a gitdir '%s'", argv[i]);
			puts(gitdir);
			continue;
		}

		/* The rest of the options require a git repository. */
		if (!did_repo_setup) {
			prefix = setup_git_directory();
			git_config(git_default_config, NULL);
			did_repo_setup = 1;
		}

		if (!strcmp(arg, "--git-path")) {
			if (!argv[i + 1])
				die("--git-path requires an argument");
			puts(git_path("%s", argv[i + 1]));
			i++;
			continue;
		}
		if (as_is) {
			if (show_file(arg, output_prefix) && as_is < 2)
				verify_filename(prefix, arg, 0);
			continue;
		}
		if (!strcmp(arg,"-n")) {
			if (++i >= argc)
				die("-n requires an argument");
			if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
				show(arg);
				show(argv[i]);
			}
			continue;
		}
		if (starts_with(arg, "-n")) {
			if ((filter & DO_FLAGS) && (filter & DO_REVS))
				show(arg);
			continue;
		}

		if (*arg == '-') {
			if (!strcmp(arg, "--")) {
				as_is = 2;
				/* Pass on the "--" if we show anything but files.. */
				if (filter & (DO_FLAGS | DO_REVS))
					show_file(arg, 0);
				continue;
			}
			if (!strcmp(arg, "--default")) {
				def = argv[++i];
				if (!def)
					die("--default requires an argument");
				continue;
			}
			if (!strcmp(arg, "--prefix")) {
				prefix = argv[++i];
				if (!prefix)
					die("--prefix requires an argument");
				startup_info->prefix = prefix;
				output_prefix = 1;
				continue;
			}
			if (!strcmp(arg, "--revs-only")) {
				filter &= ~DO_NOREV;
				continue;
			}
			if (!strcmp(arg, "--no-revs")) {
				filter &= ~DO_REVS;
				continue;
			}
			if (!strcmp(arg, "--flags")) {
				filter &= ~DO_NONFLAGS;
				continue;
			}
			if (!strcmp(arg, "--no-flags")) {
				filter &= ~DO_FLAGS;
				continue;
			}
			if (!strcmp(arg, "--verify")) {
				filter &= ~(DO_FLAGS|DO_NOREV);
				verify = 1;
				continue;
			}
			if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
				quiet = 1;
				flags |= GET_SHA1_QUIETLY;
				continue;
			}
			if (opt_with_value(arg, "--short", &arg)) {
				filter &= ~(DO_FLAGS|DO_NOREV);
				verify = 1;
				abbrev = DEFAULT_ABBREV;
				if (!arg)
					continue;
				abbrev = strtoul(arg, NULL, 10);
				if (abbrev < MINIMUM_ABBREV)
					abbrev = MINIMUM_ABBREV;
				else if (40 <= abbrev)
					abbrev = 40;
				continue;
			}
			if (!strcmp(arg, "--sq")) {
				output_sq = 1;
				continue;
			}
			if (!strcmp(arg, "--not")) {
				show_type ^= REVERSED;
				continue;
			}
			if (!strcmp(arg, "--symbolic")) {
				symbolic = SHOW_SYMBOLIC_ASIS;
				continue;
			}
			if (!strcmp(arg, "--symbolic-full-name")) {
				symbolic = SHOW_SYMBOLIC_FULL;
				continue;
			}
			if (opt_with_value(arg, "--abbrev-ref", &arg)) {
				abbrev_ref = 1;
				abbrev_ref_strict = warn_ambiguous_refs;
				if (arg) {
					if (!strcmp(arg, "strict"))
						abbrev_ref_strict = 1;
					else if (!strcmp(arg, "loose"))
						abbrev_ref_strict = 0;
					else
						die("unknown mode for --abbrev-ref: %s",
						    arg);
				}
				continue;
			}
			if (!strcmp(arg, "--all")) {
				for_each_ref(show_reference, NULL);
				continue;
			}
			if (skip_prefix(arg, "--disambiguate=", &arg)) {
				for_each_abbrev(arg, show_abbrev, NULL);
				continue;
			}
			if (!strcmp(arg, "--bisect")) {
				for_each_ref_in("refs/bisect/bad", show_reference, NULL);
				for_each_ref_in("refs/bisect/good", anti_reference, NULL);
				continue;
			}
			if (opt_with_value(arg, "--branches", &arg)) {
				handle_ref_opt(arg, "refs/heads/");
				continue;
			}
			if (opt_with_value(arg, "--tags", &arg)) {
				handle_ref_opt(arg, "refs/tags/");
				continue;
			}
			if (skip_prefix(arg, "--glob=", &arg)) {
				handle_ref_opt(arg, NULL);
				continue;
			}
			if (opt_with_value(arg, "--remotes", &arg)) {
				handle_ref_opt(arg, "refs/remotes/");
				continue;
			}
			if (skip_prefix(arg, "--exclude=", &arg)) {
				add_ref_exclusion(&ref_excludes, arg);
				continue;
			}
			if (!strcmp(arg, "--show-toplevel")) {
				const char *work_tree = get_git_work_tree();
				if (work_tree)
					puts(work_tree);
				continue;
			}
			if (!strcmp(arg, "--show-prefix")) {
				if (prefix)
					puts(prefix);
				else
					putchar('\n');
				continue;
			}
			if (!strcmp(arg, "--show-cdup")) {
				const char *pfx = prefix;
				if (!is_inside_work_tree()) {
					const char *work_tree =
						get_git_work_tree();
					if (work_tree)
						printf("%s\n", work_tree);
					continue;
				}
				while (pfx) {
					pfx = strchr(pfx, '/');
					if (pfx) {
						pfx++;
						printf("../");
					}
				}
				putchar('\n');
				continue;
			}
			if (!strcmp(arg, "--git-dir")) {
				const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
				char *cwd;
				int len;
				if (gitdir) {
					puts(gitdir);
					continue;
				}
				if (!prefix) {
					puts(".git");
					continue;
				}
				cwd = xgetcwd();
				len = strlen(cwd);
				printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
				free(cwd);
				continue;
			}
			if (!strcmp(arg, "--git-common-dir")) {
				const char *pfx = prefix ? prefix : "";
				puts(prefix_filename(pfx, strlen(pfx), get_git_common_dir()));
				continue;
			}
			if (!strcmp(arg, "--is-inside-git-dir")) {
				printf("%s\n", is_inside_git_dir() ? "true"
						: "false");
				continue;
			}
			if (!strcmp(arg, "--is-inside-work-tree")) {
				printf("%s\n", is_inside_work_tree() ? "true"
						: "false");
				continue;
			}
			if (!strcmp(arg, "--is-bare-repository")) {
				printf("%s\n", is_bare_repository() ? "true"
						: "false");
				continue;
			}
			if (!strcmp(arg, "--shared-index-path")) {
				if (read_cache() < 0)
					die(_("Could not read the index"));
				if (the_index.split_index) {
					const unsigned char *sha1 = the_index.split_index->base_sha1;
					puts(git_path("sharedindex.%s", sha1_to_hex(sha1)));
				}
				continue;
			}
			if (skip_prefix(arg, "--since=", &arg)) {
				show_datestring("--max-age=", arg);
				continue;
			}
			if (skip_prefix(arg, "--after=", &arg)) {
				show_datestring("--max-age=", arg);
				continue;
			}
			if (skip_prefix(arg, "--before=", &arg)) {
				show_datestring("--min-age=", arg);
				continue;
			}
			if (skip_prefix(arg, "--until=", &arg)) {
				show_datestring("--min-age=", arg);
				continue;
			}
			if (show_flag(arg) && verify)
				die_no_single_rev(quiet);
			continue;
		}

		/* Not a flag argument */
		if (try_difference(arg))
			continue;
		if (try_parent_shorthands(arg))
			continue;
		name = arg;
		type = NORMAL;
		if (*arg == '^') {
			name++;
			type = REVERSED;
		}
		if (!get_sha1_with_context(name, flags, sha1, &unused)) {
			if (verify)
				revs_count++;
			else
				show_rev(type, sha1, name);
			continue;
		}
		if (verify)
			die_no_single_rev(quiet);
		if (has_dashdash)
			die("bad revision '%s'", arg);
		as_is = 1;
		if (!show_file(arg, output_prefix))
			continue;
		verify_filename(prefix, arg, 1);
	}
	if (verify) {
		if (revs_count == 1) {
			show_rev(type, sha1, name);
			return 0;
		} else if (revs_count == 0 && show_default())
			return 0;
		die_no_single_rev(quiet);
	} else
		show_default();
	return 0;
}
Example #13
0
static int add_worktree(const char *path, const char *refname,
			const struct add_opts *opts)
{
	struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	const char *name;
	struct stat st;
	struct child_process cp = CHILD_PROCESS_INIT;
	struct argv_array child_env = ARGV_ARRAY_INIT;
	int counter = 0, len, ret;
	struct strbuf symref = STRBUF_INIT;
	struct commit *commit = NULL;
	int is_branch = 0;

	if (file_exists(path) && !is_empty_dir(path))
		die(_("'%s' already exists"), path);

	/* is 'refname' a branch or commit? */
	if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
	    ref_exists(symref.buf)) {
		is_branch = 1;
		if (!opts->force)
			die_if_checked_out(symref.buf, 0);
	}
	commit = lookup_commit_reference_by_name(refname);
	if (!commit)
		die(_("invalid reference: %s"), refname);

	name = worktree_basename(path, &len);
	git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
	len = sb_repo.len;
	if (safe_create_leading_directories_const(sb_repo.buf))
		die_errno(_("could not create leading directories of '%s'"),
			  sb_repo.buf);
	while (!stat(sb_repo.buf, &st)) {
		counter++;
		strbuf_setlen(&sb_repo, len);
		strbuf_addf(&sb_repo, "%d", counter);
	}
	name = strrchr(sb_repo.buf, '/') + 1;

	junk_pid = getpid();
	atexit(remove_junk);
	sigchain_push_common(remove_junk_on_signal);

	if (mkdir(sb_repo.buf, 0777))
		die_errno(_("could not create directory of '%s'"), sb_repo.buf);
	junk_git_dir = xstrdup(sb_repo.buf);
	is_junk = 1;

	/*
	 * lock the incomplete repo so prune won't delete it, unlock
	 * after the preparation is over.
	 */
	strbuf_addf(&sb, "%s/locked", sb_repo.buf);
	if (!opts->keep_locked)
		write_file(sb.buf, "initializing");
	else
		write_file(sb.buf, "added with --lock");

	strbuf_addf(&sb_git, "%s/.git", path);
	if (safe_create_leading_directories_const(sb_git.buf))
		die_errno(_("could not create leading directories of '%s'"),
			  sb_git.buf);
	junk_work_tree = xstrdup(path);

	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
	write_file(sb.buf, "%s", real_path(sb_git.buf));
	write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
		   real_path(get_git_common_dir()), name);
	/*
	 * This is to keep resolve_ref() happy. We need a valid HEAD
	 * or is_git_directory() will reject the directory. Any value which
	 * looks like an object ID will do since it will be immediately
	 * replaced by the symbolic-ref or update-ref invocation in the new
	 * worktree.
	 */
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
	write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
	write_file(sb.buf, "../..");

	fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);

	argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
	argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
	cp.git_cmd = 1;

	if (!is_branch)
		argv_array_pushl(&cp.args, "update-ref", "HEAD",
				 oid_to_hex(&commit->object.oid), NULL);
	else
		argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
				 symref.buf, NULL);
	cp.env = child_env.argv;
	ret = run_command(&cp);
	if (ret)
		goto done;

	if (opts->checkout) {
		cp.argv = NULL;
		argv_array_clear(&cp.args);
		argv_array_pushl(&cp.args, "reset", "--hard", NULL);
		cp.env = child_env.argv;
		ret = run_command(&cp);
		if (ret)
			goto done;
	}

	is_junk = 0;
	FREE_AND_NULL(junk_work_tree);
	FREE_AND_NULL(junk_git_dir);

done:
	if (ret || !opts->keep_locked) {
		strbuf_reset(&sb);
		strbuf_addf(&sb, "%s/locked", sb_repo.buf);
		unlink_or_warn(sb.buf);
	}

	/*
	 * Hook failure does not warrant worktree deletion, so run hook after
	 * is_junk is cleared, but do return appropriate code when hook fails.
	 */
	if (!ret && opts->checkout) {
		const char *hook = find_hook("post-checkout");
		if (hook) {
			const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
			cp.git_cmd = 0;
			cp.no_stdin = 1;
			cp.stdout_to_stderr = 1;
			cp.dir = path;
			cp.env = env;
			cp.argv = NULL;
			argv_array_pushl(&cp.args, absolute_path(hook),
					 oid_to_hex(&null_oid),
					 oid_to_hex(&commit->object.oid),
					 "1", NULL);
			ret = run_command(&cp);
		}
	}

	argv_array_clear(&child_env);
	strbuf_release(&sb);
	strbuf_release(&symref);
	strbuf_release(&sb_repo);
	strbuf_release(&sb_git);
	return ret;
}