[thirdparty/git.git] / worktree.c

#include "cache.h"
#include "refs.h"
#include "strbuf.h"
#include "worktree.h"
#include "dir.h"
#include "wt-status.h"

void free_worktrees(struct worktree **worktrees)
{
	int i = 0;

	for (i = 0; worktrees[i]; i++) {
		free(worktrees[i]->path);
		free(worktrees[i]->id);
		free(worktrees[i]->head_ref);
		free(worktrees[i]->lock_reason);
		free(worktrees[i]);
	}
	free (worktrees);
}

/*
 * read 'path_to_ref' into 'ref'.  Also if is_detached is not NULL,
 * set is_detached to 1 (0) if the ref is detached (is not detached).
 *
 * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
 * for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
 * git_path). Parse the ref ourselves.
 *
 * return -1 if the ref is not a proper ref, 0 otherwise (success)
 */
static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
{
	if (is_detached)
		*is_detached = 0;
	if (!strbuf_readlink(ref, path_to_ref, 0)) {
		/* HEAD is symbolic link */
		if (!starts_with(ref->buf, "refs/") ||
				check_refname_format(ref->buf, 0))
			return -1;
	} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
		/* textual symref or detached */
		if (!starts_with(ref->buf, "ref:")) {
			if (is_detached)
				*is_detached = 1;
		} else {
			strbuf_remove(ref, 0, strlen("ref:"));
			strbuf_trim(ref);
			if (check_refname_format(ref->buf, 0))
				return -1;
		}
	} else
		return -1;
	return 0;
}

/**
 * Add the head_sha1 and head_ref (if not detached) to the given worktree
 */
static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
{
	if (head_ref->len) {
		if (worktree->is_detached) {
			get_sha1_hex(head_ref->buf, worktree->head_sha1);
		} else {
			resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL);
			worktree->head_ref = strbuf_detach(head_ref, NULL);
		}
	}
}

/**
 * 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;
}

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;
}

static void mark_current_worktree(struct worktree **worktrees)
{
	char *git_dir = xstrdup(absolute_path(get_git_dir()));
	int i;

	for (i = 0; worktrees[i]; i++) {
		struct worktree *wt = worktrees[i];
		const char *wt_git_dir = get_worktree_git_dir(wt);

		if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
			wt->is_current = 1;
			break;
		}
	}
	free(git_dir);
}

struct worktree **get_worktrees(void)
{
	struct worktree **list = NULL;
	struct strbuf path = STRBUF_INIT;
	DIR *dir;
	struct dirent *d;
	int counter = 0, alloc = 2;

	list = xmalloc(alloc * sizeof(struct worktree *));

	if ((list[counter] = get_main_worktree()))
		counter++;

	strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
	dir = opendir(path.buf);
	strbuf_release(&path);
	if (dir) {
		while ((d = readdir(dir)) != NULL) {
			struct worktree *linked = NULL;
			if (is_dot_or_dotdot(d->d_name))
				continue;

			if ((linked = get_linked_worktree(d->d_name))) {
				ALLOC_GROW(list, counter + 1, alloc);
				list[counter++] = linked;
			}
		}
		closedir(dir);
	}
	ALLOC_GROW(list, counter + 1, alloc);
	list[counter] = NULL;

	mark_current_worktree(list);
	return list;
}

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);
}

static struct worktree *find_worktree_by_suffix(struct worktree **list,
						const char *suffix)
{
	struct worktree *found = NULL;
	int nr_found = 0, suffixlen;

	suffixlen = strlen(suffix);
	if (!suffixlen)
		return NULL;

	for (; *list && nr_found < 2; list++) {
		const char	*path	 = (*list)->path;
		int		 pathlen = strlen(path);
		int		 start	 = pathlen - suffixlen;

		/* suffix must start at directory boundary */
		if ((!start || (start > 0 && is_dir_sep(path[start - 1]))) &&
		    !fspathcmp(suffix, path + start)) {
			found = *list;
			nr_found++;
		}
	}
	return nr_found == 1 ? found : NULL;
}

struct worktree *find_worktree(struct worktree **list,
			       const char *prefix,
			       const char *arg)
{
	struct worktree *wt;
	char *path;

	if ((wt = find_worktree_by_suffix(list, arg)))
		return wt;

	arg = prefix_filename(prefix, strlen(prefix), arg);
	path = xstrdup(real_path(arg));
	for (; *list; list++)
		if (!fspathcmp(path, real_path((*list)->path)))
			break;
	free(path);
	return *list;
}

int is_main_worktree(const struct worktree *wt)
{
	return !wt->id;
}

const char *is_worktree_locked(struct worktree *wt)
{
	assert(!is_main_worktree(wt));

	if (!wt->lock_reason_valid) {
		struct strbuf path = STRBUF_INIT;

		strbuf_addstr(&path, worktree_git_path(wt, "locked"));
		if (file_exists(path.buf)) {
			struct strbuf lock_reason = STRBUF_INIT;
			if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
				die_errno(_("failed to read '%s'"), path.buf);
			strbuf_trim(&lock_reason);
			wt->lock_reason = strbuf_detach(&lock_reason, NULL);
		} else
			wt->lock_reason = NULL;
		wt->lock_reason_valid = 1;
		strbuf_release(&path);
	}

	return wt->lock_reason;
}

int is_worktree_being_rebased(const struct worktree *wt,
			      const char *target)
{
	struct wt_status_state state;
	int found_rebase;

	memset(&state, 0, sizeof(state));
	found_rebase = wt_status_check_rebase(wt, &state) &&
		((state.rebase_in_progress ||
		  state.rebase_interactive_in_progress) &&
		 state.branch &&
		 starts_with(target, "refs/heads/") &&
		 !strcmp(state.branch, target + strlen("refs/heads/")));
	free(state.branch);
	free(state.onto);
	return found_rebase;
}

int is_worktree_being_bisected(const struct worktree *wt,
			       const char *target)
{
	struct wt_status_state state;
	int found_rebase;

	memset(&state, 0, sizeof(state));
	found_rebase = wt_status_check_bisect(wt, &state) &&
		state.branch &&
		starts_with(target, "refs/heads/") &&
		!strcmp(state.branch, target + strlen("refs/heads/"));
	free(state.branch);
	return found_rebase;
}

/*
 * note: this function should be able to detect shared symref even if
 * HEAD is temporarily detached (e.g. in the middle of rebase or
 * bisect). New commands that do similar things should update this
 * function as well.
 */
const struct worktree *find_shared_symref(const char *symref,
					  const char *target)
{
	const struct worktree *existing = NULL;
	struct strbuf path = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	static struct worktree **worktrees;
	int i = 0;

	if (worktrees)
		free_worktrees(worktrees);
	worktrees = get_worktrees();

	for (i = 0; worktrees[i]; i++) {
		struct worktree *wt = worktrees[i];

		if (wt->is_detached && !strcmp(symref, "HEAD")) {
			if (is_worktree_being_rebased(wt, target)) {
				existing = wt;
				break;
			}
			if (is_worktree_being_bisected(wt, target)) {
				existing = wt;
				break;
			}
		}

		strbuf_reset(&path);
		strbuf_reset(&sb);
		strbuf_addf(&path, "%s/%s",
			    get_worktree_git_dir(wt),
			    symref);

		if (parse_ref(path.buf, &sb, NULL)) {
			continue;
		}

		if (!strcmp(sb.buf, target)) {
			existing = wt;
			break;
		}
	}

	strbuf_release(&path);
	strbuf_release(&sb);

	return existing;
}
Commit	Line	Data
ac6c561b MR	1	#include "cache.h"
	2	#include "refs.h"
	3	#include "strbuf.h"
	4	#include "worktree.h"
750e8a60	5	#include "dir.h"
8d9fdd70	6	#include "wt-status.h"
ac6c561b	7
51934904 MR	8	void free_worktrees(struct worktree **worktrees)
	9	{
	10	int i = 0;
	11
	12	for (i = 0; worktrees[i]; i++) {
	13	free(worktrees[i]->path);
69dfe3b9	14	free(worktrees[i]->id);
92718b74	15	free(worktrees[i]->head_ref);
346ef530	16	free(worktrees[i]->lock_reason);
51934904 MR	17	free(worktrees[i]);
	18	}
	19	free (worktrees);
	20	}
	21
1ceb7f90 MR	22	/*
1ceb7f90 MR	23	* read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
832c0e5e	24	* set is_detached to 1 (0) if the ref is detached (is not detached).
1ceb7f90 MR	25	*
	26	* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
	27	* for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
	28	* git_path). Parse the ref ourselves.
	29	*
	30	* return -1 if the ref is not a proper ref, 0 otherwise (success)
	31	*/
	32	static int parse_ref(char path_to_ref, struct strbuf ref, int *is_detached)
	33	{
	34	if (is_detached)
	35	*is_detached = 0;
	36	if (!strbuf_readlink(ref, path_to_ref, 0)) {
	37	/* HEAD is symbolic link */
	38	if (!starts_with(ref->buf, "refs/") \|\|
	39	check_refname_format(ref->buf, 0))
	40	return -1;
	41	} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
	42	/* textual symref or detached */
	43	if (!starts_with(ref->buf, "ref:")) {
	44	if (is_detached)
	45	*is_detached = 1;
	46	} else {
	47	strbuf_remove(ref, 0, strlen("ref:"));
	48	strbuf_trim(ref);
	49	if (check_refname_format(ref->buf, 0))
	50	return -1;
	51	}
	52	} else
	53	return -1;
	54	return 0;
	55	}
	56
92718b74 MR	57	/**
	58	* Add the head_sha1 and head_ref (if not detached) to the given worktree
	59	*/
	60	static void add_head_info(struct strbuf head_ref, struct worktree worktree)
	61	{
	62	if (head_ref->len) {
	63	if (worktree->is_detached) {
	64	get_sha1_hex(head_ref->buf, worktree->head_sha1);
	65	} else {
	66	resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL);
	67	worktree->head_ref = strbuf_detach(head_ref, NULL);
	68	}
	69	}
	70	}
	71
51934904 MR	72	/**
	73	* get the main worktree
	74	*/
	75	static struct worktree *get_main_worktree(void)
1ceb7f90	76	{
51934904	77	struct worktree *worktree = NULL;
1ceb7f90	78	struct strbuf path = STRBUF_INIT;
51934904	79	struct strbuf worktree_path = STRBUF_INIT;
51934904	80	struct strbuf head_ref = STRBUF_INIT;
92718b74 MR	81	int is_bare = 0;
92718b74 MR	82	int is_detached = 0;
1ceb7f90	83
fd2e7daf	84	strbuf_add_absolute_path(&worktree_path, get_git_common_dir());
92718b74 MR	85	is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
92718b74 MR	86	if (is_bare)
51934904 MR	87	strbuf_strip_suffix(&worktree_path, "/.");
	88
	89	strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
	90
92718b74 MR	91	if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
	92	goto done;
	93
	94	worktree = xmalloc(sizeof(struct worktree));
	95	worktree->path = strbuf_detach(&worktree_path, NULL);
69dfe3b9	96	worktree->id = NULL;
92718b74 MR	97	worktree->is_bare = is_bare;
	98	worktree->head_ref = NULL;
	99	worktree->is_detached = is_detached;
750e8a60	100	worktree->is_current = 0;
92718b74	101	add_head_info(&head_ref, worktree);
346ef530 NTND	102	worktree->lock_reason = NULL;
346ef530 NTND	103	worktree->lock_reason_valid = 0;
92718b74 MR	104
92718b74 MR	105	done:
1ceb7f90	106	strbuf_release(&path);
51934904 MR	107	strbuf_release(&worktree_path);
	108	strbuf_release(&head_ref);
	109	return worktree;
1ceb7f90 MR	110	}
1ceb7f90 MR	111
51934904	112	static struct worktree get_linked_worktree(const char id)
ac6c561b	113	{
51934904	114	struct worktree *worktree = NULL;
ac6c561b	115	struct strbuf path = STRBUF_INIT;
51934904	116	struct strbuf worktree_path = STRBUF_INIT;
51934904	117	struct strbuf head_ref = STRBUF_INIT;
92718b74	118	int is_detached = 0;
ac6c561b	119
1ceb7f90 MR	120	if (!id)
1ceb7f90 MR	121	die("Missing linked worktree name");
ac6c561b	122
69dfe3b9	123	strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
51934904 MR	124	if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
51934904 MR	125	/* invalid gitdir file */
ac6c561b	126	goto done;
51934904 MR	127
	128	strbuf_rtrim(&worktree_path);
	129	if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
	130	strbuf_reset(&worktree_path);
fd2e7daf	131	strbuf_add_absolute_path(&worktree_path, ".");
51934904 MR	132	strbuf_strip_suffix(&worktree_path, "/.");
	133	}
	134
1ceb7f90	135	strbuf_reset(&path);
51934904 MR	136	strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
51934904 MR	137
92718b74 MR	138	if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
	139	goto done;
	140
	141	worktree = xmalloc(sizeof(struct worktree));
	142	worktree->path = strbuf_detach(&worktree_path, NULL);
69dfe3b9	143	worktree->id = xstrdup(id);
92718b74 MR	144	worktree->is_bare = 0;
	145	worktree->head_ref = NULL;
	146	worktree->is_detached = is_detached;
750e8a60	147	worktree->is_current = 0;
92718b74	148	add_head_info(&head_ref, worktree);
346ef530 NTND	149	worktree->lock_reason = NULL;
346ef530 NTND	150	worktree->lock_reason_valid = 0;
ac6c561b	151
ac6c561b MR	152	done:
ac6c561b MR	153	strbuf_release(&path);
51934904 MR	154	strbuf_release(&worktree_path);
	155	strbuf_release(&head_ref);
	156	return worktree;
ac6c561b MR	157	}
ac6c561b MR	158
750e8a60 NTND	159	static void mark_current_worktree(struct worktree **worktrees)
750e8a60 NTND	160	{
360af2da	161	char *git_dir = xstrdup(absolute_path(get_git_dir()));
750e8a60 NTND	162	int i;
750e8a60 NTND	163
750e8a60 NTND	164	for (i = 0; worktrees[i]; i++) {
750e8a60 NTND	165	struct worktree *wt = worktrees[i];
360af2da NTND	166	const char *wt_git_dir = get_worktree_git_dir(wt);
	167
	168	if (!fspathcmp(git_dir, absolute_path(wt_git_dir))) {
	169	wt->is_current = 1;
750e8a60	170	break;
360af2da	171	}
750e8a60	172	}
360af2da	173	free(git_dir);
750e8a60 NTND	174	}
750e8a60 NTND	175
51934904	176	struct worktree **get_worktrees(void)
ac6c561b	177	{
51934904	178	struct worktree **list = NULL;
ac6c561b MR	179	struct strbuf path = STRBUF_INIT;
	180	DIR *dir;
	181	struct dirent *d;
51934904 MR	182	int counter = 0, alloc = 2;
	183
	184	list = xmalloc(alloc * sizeof(struct worktree *));
ac6c561b	185
51934904 MR	186	if ((list[counter] = get_main_worktree()))
51934904 MR	187	counter++;
ac6c561b MR	188
	189	strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
	190	dir = opendir(path.buf);
	191	strbuf_release(&path);
51934904 MR	192	if (dir) {
	193	while ((d = readdir(dir)) != NULL) {
	194	struct worktree *linked = NULL;
afb9e30b	195	if (is_dot_or_dotdot(d->d_name))
51934904	196	continue;
ac6c561b	197
d4cddd66 NTND	198	if ((linked = get_linked_worktree(d->d_name))) {
	199	ALLOC_GROW(list, counter + 1, alloc);
	200	list[counter++] = linked;
	201	}
51934904 MR	202	}
	203	closedir(dir);
	204	}
	205	ALLOC_GROW(list, counter + 1, alloc);
	206	list[counter] = NULL;
750e8a60 NTND	207
750e8a60 NTND	208	mark_current_worktree(list);
51934904 MR	209	return list;
	210	}
	211
69dfe3b9 NTND	212	const char get_worktree_git_dir(const struct worktree wt)
	213	{
	214	if (!wt)
	215	return get_git_dir();
	216	else if (!wt->id)
	217	return get_git_common_dir();
	218	else
	219	return git_common_path("worktrees/%s", wt->id);
	220	}
	221
080739ba NTND	222	static struct worktree find_worktree_by_suffix(struct worktree *list,
	223	const char *suffix)
	224	{
	225	struct worktree *found = NULL;
	226	int nr_found = 0, suffixlen;
	227
	228	suffixlen = strlen(suffix);
	229	if (!suffixlen)
	230	return NULL;
	231
	232	for (; *list && nr_found < 2; list++) {
	233	const char path = (list)->path;
	234	int pathlen = strlen(path);
	235	int start = pathlen - suffixlen;
	236
	237	/* suffix must start at directory boundary */
	238	if ((!start \|\| (start > 0 && is_dir_sep(path[start - 1]))) &&
	239	!fspathcmp(suffix, path + start)) {
	240	found = *list;
	241	nr_found++;
	242	}
	243	}
	244	return nr_found == 1 ? found : NULL;
	245	}
	246
68353144 NTND	247	struct worktree find_worktree(struct worktree *list,
	248	const char *prefix,
	249	const char *arg)
	250	{
080739ba	251	struct worktree *wt;
68353144 NTND	252	char *path;
68353144 NTND	253
080739ba NTND	254	if ((wt = find_worktree_by_suffix(list, arg)))
	255	return wt;
	256
68353144 NTND	257	arg = prefix_filename(prefix, strlen(prefix), arg);
	258	path = xstrdup(real_path(arg));
	259	for (; *list; list++)
	260	if (!fspathcmp(path, real_path((*list)->path)))
	261	break;
	262	free(path);
	263	return *list;
	264	}
	265
984ad9e5 NTND	266	int is_main_worktree(const struct worktree *wt)
	267	{
	268	return !wt->id;
	269	}
	270
346ef530 NTND	271	const char is_worktree_locked(struct worktree wt)
	272	{
	273	assert(!is_main_worktree(wt));
	274
	275	if (!wt->lock_reason_valid) {
	276	struct strbuf path = STRBUF_INIT;
	277
	278	strbuf_addstr(&path, worktree_git_path(wt, "locked"));
	279	if (file_exists(path.buf)) {
	280	struct strbuf lock_reason = STRBUF_INIT;
	281	if (strbuf_read_file(&lock_reason, path.buf, 0) < 0)
	282	die_errno(_("failed to read '%s'"), path.buf);
	283	strbuf_trim(&lock_reason);
	284	wt->lock_reason = strbuf_detach(&lock_reason, NULL);
	285	} else
	286	wt->lock_reason = NULL;
	287	wt->lock_reason_valid = 1;
	288	strbuf_release(&path);
	289	}
	290
	291	return wt->lock_reason;
	292	}
	293
14ace5b7 NTND	294	int is_worktree_being_rebased(const struct worktree *wt,
14ace5b7 NTND	295	const char *target)
8d9fdd70 NTND	296	{
	297	struct wt_status_state state;
	298	int found_rebase;
	299
	300	memset(&state, 0, sizeof(state));
	301	found_rebase = wt_status_check_rebase(wt, &state) &&
	302	((state.rebase_in_progress \|\|
	303	state.rebase_interactive_in_progress) &&
	304	state.branch &&
	305	starts_with(target, "refs/heads/") &&
	306	!strcmp(state.branch, target + strlen("refs/heads/")));
	307	free(state.branch);
	308	free(state.onto);
	309	return found_rebase;
	310	}
	311
14ace5b7 NTND	312	int is_worktree_being_bisected(const struct worktree *wt,
14ace5b7 NTND	313	const char *target)
51934904	314	{
04a3dfb8 NTND	315	struct wt_status_state state;
	316	int found_rebase;
	317
	318	memset(&state, 0, sizeof(state));
	319	found_rebase = wt_status_check_bisect(wt, &state) &&
	320	state.branch &&
	321	starts_with(target, "refs/heads/") &&
	322	!strcmp(state.branch, target + strlen("refs/heads/"));
	323	free(state.branch);
	324	return found_rebase;
	325	}
	326
8d9fdd70 NTND	327	/*
	328	* note: this function should be able to detect shared symref even if
	329	* HEAD is temporarily detached (e.g. in the middle of rebase or
	330	* bisect). New commands that do similar things should update this
	331	* function as well.
	332	*/
d3b9ac07 NTND	333	const struct worktree find_shared_symref(const char symref,
d3b9ac07 NTND	334	const char *target)
51934904	335	{
d3b9ac07	336	const struct worktree *existing = NULL;
51934904 MR	337	struct strbuf path = STRBUF_INIT;
51934904 MR	338	struct strbuf sb = STRBUF_INIT;
d3b9ac07	339	static struct worktree **worktrees;
51934904 MR	340	int i = 0;
51934904 MR	341
d3b9ac07 NTND	342	if (worktrees)
	343	free_worktrees(worktrees);
	344	worktrees = get_worktrees();
	345
51934904	346	for (i = 0; worktrees[i]; i++) {
c8717148 NTND	347	struct worktree *wt = worktrees[i];
c8717148 NTND	348
8d9fdd70 NTND	349	if (wt->is_detached && !strcmp(symref, "HEAD")) {
	350	if (is_worktree_being_rebased(wt, target)) {
	351	existing = wt;
	352	break;
	353	}
04a3dfb8 NTND	354	if (is_worktree_being_bisected(wt, target)) {
	355	existing = wt;
	356	break;
	357	}
8d9fdd70 NTND	358	}
8d9fdd70 NTND	359
51934904 MR	360	strbuf_reset(&path);
51934904 MR	361	strbuf_reset(&sb);
69dfe3b9	362	strbuf_addf(&path, "%s/%s",
c8717148	363	get_worktree_git_dir(wt),
69dfe3b9	364	symref);
51934904 MR	365
51934904 MR	366	if (parse_ref(path.buf, &sb, NULL)) {
ac6c561b	367	continue;
51934904 MR	368	}
	369
	370	if (!strcmp(sb.buf, target)) {
c8717148	371	existing = wt;
51934904 MR	372	break;
51934904 MR	373	}
ac6c561b	374	}
51934904 MR	375
	376	strbuf_release(&path);
	377	strbuf_release(&sb);
ac6c561b MR	378
	379	return existing;
	380	}