[libgit2.git] / src / worktree.c

/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */

#include "common.h"

#include "git2/branch.h"
#include "git2/commit.h"
#include "git2/worktree.h"

#include "repository.h"
#include "worktree.h"

static bool is_worktree_dir(const char *dir)
{
	git_buf buf = GIT_BUF_INIT;
	int error;

	if (git_buf_sets(&buf, dir) < 0)
		return -1;

	error = git_path_contains_file(&buf, "commondir")
		&& git_path_contains_file(&buf, "gitdir")
		&& git_path_contains_file(&buf, "HEAD");

	git_buf_free(&buf);
	return error;
}

int git_worktree_list(git_strarray *wts, git_repository *repo)
{
	git_vector worktrees = GIT_VECTOR_INIT;
	git_buf path = GIT_BUF_INIT;
	char *worktree;
	unsigned i, len;
	int error;

	assert(wts && repo);

	wts->count = 0;
	wts->strings = NULL;

	if ((error = git_buf_printf(&path, "%s/worktrees/", repo->commondir)) < 0)
		goto exit;
	if (!git_path_exists(path.ptr) || git_path_is_empty_dir(path.ptr))
		goto exit;
	if ((error = git_path_dirload(&worktrees, path.ptr, path.size, 0x0)) < 0)
		goto exit;

	len = path.size;

	git_vector_foreach(&worktrees, i, worktree) {
		git_buf_truncate(&path, len);
		git_buf_puts(&path, worktree);

		if (!is_worktree_dir(path.ptr)) {
			git_vector_remove(&worktrees, i);
			git__free(worktree);
		}
	}

	wts->strings = (char **)git_vector_detach(&wts->count, NULL, &worktrees);

exit:
	git_buf_free(&path);

	return error;
}

char *git_worktree__read_link(const char *base, const char *file)
{
	git_buf path = GIT_BUF_INIT, buf = GIT_BUF_INIT;

	assert(base && file);

	if (git_buf_joinpath(&path, base, file) < 0)
		goto err;
	if (git_futils_readbuffer(&buf, path.ptr) < 0)
		goto err;
	git_buf_free(&path);

	git_buf_rtrim(&buf);

	if (!git_path_is_relative(buf.ptr))
		return git_buf_detach(&buf);

	if (git_buf_sets(&path, base) < 0)
		goto err;
	if (git_path_apply_relative(&path, buf.ptr) < 0)
		goto err;
	git_buf_free(&buf);

	return git_buf_detach(&path);

err:
	git_buf_free(&buf);
	git_buf_free(&path);

	return NULL;
}

static int write_wtfile(const char *base, const char *file, const git_buf *buf)
{
	git_buf path = GIT_BUF_INIT;
	int err;

	assert(base && file && buf);

	if ((err = git_buf_joinpath(&path, base, file)) < 0)
		goto out;

	if ((err = git_futils_writebuffer(buf, path.ptr, O_CREAT|O_EXCL|O_WRONLY, 0644)) < 0)
		goto out;

out:
	git_buf_free(&path);

	return err;
}

static int open_worktree_dir(git_worktree **out, const char *parent, const char *dir, const char *name)
{
	git_buf gitdir = GIT_BUF_INIT;
	git_worktree *wt = NULL;
	int error = 0;

	if (!is_worktree_dir(dir)) {
		error = -1;
		goto out;
	}

	if ((wt = git__calloc(1, sizeof(struct git_repository))) == NULL) {
		error = -1;
		goto out;
	}

	if ((wt->name = git__strdup(name)) == NULL
	    || (wt->commondir_path = git_worktree__read_link(dir, "commondir")) == NULL
	    || (wt->gitlink_path = git_worktree__read_link(dir, "gitdir")) == NULL
	    || (wt->parent_path = git__strdup(parent)) == NULL) {
		error = -1;
		goto out;
	}

	if ((error = git_path_prettify_dir(&gitdir, dir, NULL)) < 0)
		goto out;
	wt->gitdir_path = git_buf_detach(&gitdir);

	wt->locked = !!git_worktree_is_locked(NULL, wt);

	*out = wt;

out:
	if (error)
		git_worktree_free(wt);
	git_buf_free(&gitdir);

	return error;
}

int git_worktree_lookup(git_worktree **out, git_repository *repo, const char *name)
{
	git_buf path = GIT_BUF_INIT;
	git_worktree *wt = NULL;
	int error;

	assert(repo && name);

	*out = NULL;

	if ((error = git_buf_printf(&path, "%s/worktrees/%s", repo->commondir, name)) < 0)
		goto out;

	if ((error = (open_worktree_dir(out, git_repository_workdir(repo), path.ptr, name))) < 0)
		goto out;

out:
	git_buf_free(&path);

	if (error)
		git_worktree_free(wt);

	return error;
}

int git_worktree_open_from_repository(git_worktree **out, git_repository *repo)
{
	git_buf parent = GIT_BUF_INIT;
	const char *gitdir, *commondir;
	char *name = NULL;
	int error = 0;

	if (!git_repository_is_worktree(repo)) {
		giterr_set(GITERR_WORKTREE, "cannot open worktree of a non-worktree repo");
		error = -1;
		goto out;
	}

	gitdir = git_repository_path(repo);
	commondir = git_repository_commondir(repo);

	if ((error = git_path_prettify_dir(&parent, "..", commondir)) < 0)
		goto out;

	/* The name is defined by the last component in '.git/worktree/%s' */
	name = git_path_basename(gitdir);

	if ((error = open_worktree_dir(out, parent.ptr, gitdir, name)) < 0)
		goto out;

out:
	git__free(name);
	git_buf_free(&parent);

	return error;
}

void git_worktree_free(git_worktree *wt)
{
	if (!wt)
		return;

	git__free(wt->commondir_path);
	git__free(wt->gitlink_path);
	git__free(wt->gitdir_path);
	git__free(wt->parent_path);
	git__free(wt->name);
	git__free(wt);
}

int git_worktree_validate(const git_worktree *wt)
{
	git_buf buf = GIT_BUF_INIT;
	int err = 0;

	assert(wt);

	git_buf_puts(&buf, wt->gitdir_path);
	if (!is_worktree_dir(buf.ptr)) {
		giterr_set(GITERR_WORKTREE,
			"Worktree gitdir ('%s') is not valid",
			wt->gitlink_path);
		err = -1;
		goto out;
	}

	if (!git_path_exists(wt->parent_path)) {
		giterr_set(GITERR_WORKTREE,
			"Worktree parent directory ('%s') does not exist ",
			wt->parent_path);
		err = -2;
		goto out;
	}

	if (!git_path_exists(wt->commondir_path)) {
		giterr_set(GITERR_WORKTREE,
			"Worktree common directory ('%s') does not exist ",
			wt->commondir_path);
		err = -3;
		goto out;
	}

out:
	git_buf_free(&buf);

	return err;
}

int git_worktree_add_init_options(git_worktree_add_options *opts,
	unsigned int version)
{
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(opts, version,
		git_worktree_add_options, GIT_WORKTREE_ADD_OPTIONS_INIT);
	return 0;
}

int git_worktree_add(git_worktree **out, git_repository *repo,
	const char *name, const char *worktree,
	const git_worktree_add_options *opts)
{
	git_buf gitdir = GIT_BUF_INIT, wddir = GIT_BUF_INIT, buf = GIT_BUF_INIT;
	git_reference *ref = NULL, *head = NULL;
	git_commit *commit = NULL;
	git_repository *wt = NULL;
	git_checkout_options coopts = GIT_CHECKOUT_OPTIONS_INIT;
	git_worktree_add_options wtopts = GIT_WORKTREE_ADD_OPTIONS_INIT;
	int err;

	GITERR_CHECK_VERSION(
		opts, GIT_WORKTREE_ADD_OPTIONS_VERSION, "git_worktree_add_options");

	if (opts)
		memcpy(&wtopts, opts, sizeof(wtopts));

	assert(out && repo && name && worktree);

	*out = NULL;

	/* Create gitdir directory ".git/worktrees/<name>" */
	if ((err = git_buf_joinpath(&gitdir, repo->commondir, "worktrees")) < 0)
		goto out;
	if (!git_path_exists(gitdir.ptr))
		if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
			goto out;
	if ((err = git_buf_joinpath(&gitdir, gitdir.ptr, name)) < 0)
		goto out;
	if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
		goto out;
	if ((err = git_path_prettify_dir(&gitdir, gitdir.ptr, NULL)) < 0)
		goto out;

	/* Create worktree work dir */
	if ((err = git_futils_mkdir(worktree, 0755, GIT_MKDIR_EXCL)) < 0)
		goto out;
	if ((err = git_path_prettify_dir(&wddir, worktree, NULL)) < 0)
		goto out;

	if (wtopts.lock) {
		int fd;

		if ((err = git_buf_joinpath(&buf, gitdir.ptr, "locked")) < 0)
			goto out;

		if ((fd = p_creat(buf.ptr, 0644)) < 0) {
			err = fd;
			goto out;
		}

		p_close(fd);
		git_buf_clear(&buf);
	}

	/* Create worktree .git file */
	if ((err = git_buf_printf(&buf, "gitdir: %s\n", gitdir.ptr)) < 0)
		goto out;
	if ((err = write_wtfile(wddir.ptr, ".git", &buf)) < 0)
		goto out;

	/* Create gitdir files */
	if ((err = git_path_prettify_dir(&buf, repo->commondir, NULL) < 0)
	    || (err = git_buf_putc(&buf, '\n')) < 0
	    || (err = write_wtfile(gitdir.ptr, "commondir", &buf)) < 0)
		goto out;
	if ((err = git_buf_joinpath(&buf, wddir.ptr, ".git")) < 0
	    || (err = git_buf_putc(&buf, '\n')) < 0
	    || (err = write_wtfile(gitdir.ptr, "gitdir", &buf)) < 0)
		goto out;

	/* Create new branch */
	if ((err = git_repository_head(&head, repo)) < 0)
		goto out;
	if ((err = git_commit_lookup(&commit, repo, &head->target.oid)) < 0)
		goto out;
	if ((err = git_branch_create(&ref, repo, name, commit, false)) < 0)
		goto out;

	/* Set worktree's HEAD */
	if ((err = git_repository_create_head(gitdir.ptr, git_reference_name(ref))) < 0)
		goto out;
	if ((err = git_repository_open(&wt, wddir.ptr)) < 0)
		goto out;

	/* Checkout worktree's HEAD */
	coopts.checkout_strategy = GIT_CHECKOUT_FORCE;
	if ((err = git_checkout_head(wt, &coopts)) < 0)
		goto out;

	/* Load result */
	if ((err = git_worktree_lookup(out, repo, name)) < 0)
		goto out;

out:
	git_buf_free(&gitdir);
	git_buf_free(&wddir);
	git_buf_free(&buf);
	git_reference_free(ref);
	git_reference_free(head);
	git_commit_free(commit);
	git_repository_free(wt);

	return err;
}

int git_worktree_lock(git_worktree *wt, char *creason)
{
	git_buf buf = GIT_BUF_INIT, path = GIT_BUF_INIT;
	int err;

	assert(wt);

	if ((err = git_worktree_is_locked(NULL, wt)) < 0)
		goto out;

	if ((err = git_buf_joinpath(&path, wt->gitdir_path, "locked")) < 0)
		goto out;

	if (creason)
		git_buf_attach_notowned(&buf, creason, strlen(creason));

	if ((err = git_futils_writebuffer(&buf, path.ptr, O_CREAT|O_EXCL|O_WRONLY, 0644)) < 0)
		goto out;

	wt->locked = 1;

out:
	git_buf_free(&path);

	return err;
}

int git_worktree_unlock(git_worktree *wt)
{
	git_buf path = GIT_BUF_INIT;

	assert(wt);

	if (!git_worktree_is_locked(NULL, wt))
		return 0;

	if (git_buf_joinpath(&path, wt->gitdir_path, "locked") < 0)
		return -1;

	if (p_unlink(path.ptr) != 0) {
		git_buf_free(&path);
		return -1;
	}

	wt->locked = 0;

	git_buf_free(&path);

	return 0;
}

int git_worktree_is_locked(git_buf *reason, const git_worktree *wt)
{
	git_buf path = GIT_BUF_INIT;
	int ret;

	assert(wt);

	if (reason)
		git_buf_clear(reason);

	if ((ret = git_buf_joinpath(&path, wt->gitdir_path, "locked")) < 0)
		goto out;
	if ((ret = git_path_exists(path.ptr)) && reason)
		git_futils_readbuffer(reason, path.ptr);

out:
	git_buf_free(&path);

	return ret;
}

int git_worktree_prune_init_options(
	git_worktree_prune_options *opts,
	unsigned int version)
{
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(opts, version,
		git_worktree_prune_options, GIT_WORKTREE_PRUNE_OPTIONS_INIT);
	return 0;
}

int git_worktree_is_prunable(git_worktree *wt,
	git_worktree_prune_options *opts)
{
	git_buf reason = GIT_BUF_INIT;
	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;

	GITERR_CHECK_VERSION(
		opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
		"git_worktree_prune_options");

	if (opts)
		memcpy(&popts, opts, sizeof(popts));

	if ((popts.flags & GIT_WORKTREE_PRUNE_LOCKED) == 0 &&
		git_worktree_is_locked(&reason, wt))
	{
		if (!reason.size)
			git_buf_attach_notowned(&reason, "no reason given", 15);
		giterr_set(GITERR_WORKTREE, "Not pruning locked working tree: '%s'", reason.ptr);
		git_buf_free(&reason);

		return 0;
	}

	if ((popts.flags & GIT_WORKTREE_PRUNE_VALID) == 0 &&
		git_worktree_validate(wt) == 0)
	{
		giterr_set(GITERR_WORKTREE, "Not pruning valid working tree");
		return 0;
	}

	return 1;
}

int git_worktree_prune(git_worktree *wt,
	git_worktree_prune_options *opts)
{
	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
	git_buf path = GIT_BUF_INIT;
	char *wtpath;
	int err;

	GITERR_CHECK_VERSION(
		opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
		"git_worktree_prune_options");

	if (opts)
		memcpy(&popts, opts, sizeof(popts));

	if (!git_worktree_is_prunable(wt, &popts)) {
		err = -1;
		goto out;
	}

	/* Delete gitdir in parent repository */
	if ((err = git_buf_printf(&path, "%s/worktrees/%s", wt->commondir_path, wt->name)) < 0)
		goto out;
	if (!git_path_exists(path.ptr))
	{
		giterr_set(GITERR_WORKTREE, "Worktree gitdir '%s' does not exist", path.ptr);
		err = -1;
		goto out;
	}
	if ((err = git_futils_rmdir_r(path.ptr, NULL, GIT_RMDIR_REMOVE_FILES)) < 0)
		goto out;

	/* Skip deletion of the actual working tree if it does
	 * not exist or deletion was not requested */
	if ((popts.flags & GIT_WORKTREE_PRUNE_WORKING_TREE) == 0 ||
		!git_path_exists(wt->gitlink_path))
	{
		goto out;
	}

	if ((wtpath = git_path_dirname(wt->gitlink_path)) == NULL)
		goto out;
	git_buf_attach(&path, wtpath, 0);
	if (!git_path_exists(path.ptr))
	{
		giterr_set(GITERR_WORKTREE, "Working tree '%s' does not exist", path.ptr);
		err = -1;
		goto out;
	}
	if ((err = git_futils_rmdir_r(path.ptr, NULL, GIT_RMDIR_REMOVE_FILES)) < 0)
		goto out;

out:
	git_buf_free(&path);

	return err;
}
Commit	Line	Data
45f2b7a4 PS	1	/*
	2	* Copyright (C) the libgit2 contributors. All rights reserved.
	3	*
	4	* This file is part of libgit2, distributed under the GNU GPL v2 with
	5	* a Linking Exception. For full terms see the included COPYING file.
	6	*/
	7
dea7488e PS	8	#include "common.h"
	9
	10	#include "git2/branch.h"
	11	#include "git2/commit.h"
45f2b7a4 PS	12	#include "git2/worktree.h"
45f2b7a4 PS	13
45f2b7a4	14	#include "repository.h"
d3bc09e8	15	#include "worktree.h"
45f2b7a4	16
3e9c5d8a	17	static bool is_worktree_dir(const char *dir)
45f2b7a4	18	{
3e9c5d8a PS	19	git_buf buf = GIT_BUF_INIT;
	20	int error;
	21
	22	if (git_buf_sets(&buf, dir) < 0)
	23	return -1;
	24
	25	error = git_path_contains_file(&buf, "commondir")
	26	&& git_path_contains_file(&buf, "gitdir")
	27	&& git_path_contains_file(&buf, "HEAD");
	28
	29	git_buf_free(&buf);
	30	return error;
45f2b7a4 PS	31	}
	32
	33	int git_worktree_list(git_strarray wts, git_repository repo)
	34	{
	35	git_vector worktrees = GIT_VECTOR_INIT;
	36	git_buf path = GIT_BUF_INIT;
	37	char *worktree;
	38	unsigned i, len;
	39	int error;
	40
	41	assert(wts && repo);
	42
	43	wts->count = 0;
	44	wts->strings = NULL;
	45
	46	if ((error = git_buf_printf(&path, "%s/worktrees/", repo->commondir)) < 0)
	47	goto exit;
	48	if (!git_path_exists(path.ptr) \|\| git_path_is_empty_dir(path.ptr))
	49	goto exit;
	50	if ((error = git_path_dirload(&worktrees, path.ptr, path.size, 0x0)) < 0)
	51	goto exit;
	52
	53	len = path.size;
	54
	55	git_vector_foreach(&worktrees, i, worktree) {
	56	git_buf_truncate(&path, len);
	57	git_buf_puts(&path, worktree);
	58
3e9c5d8a	59	if (!is_worktree_dir(path.ptr)) {
45f2b7a4 PS	60	git_vector_remove(&worktrees, i);
	61	git__free(worktree);
	62	}
	63	}
	64
	65	wts->strings = (char **)git_vector_detach(&wts->count, NULL, &worktrees);
	66
	67	exit:
	68	git_buf_free(&path);
	69
	70	return error;
	71	}
d3bc09e8	72
39abd3ad	73	char git_worktree__read_link(const char base, const char *file)
d3bc09e8 PS	74	{
	75	git_buf path = GIT_BUF_INIT, buf = GIT_BUF_INIT;
	76
	77	assert(base && file);
	78
	79	if (git_buf_joinpath(&path, base, file) < 0)
	80	goto err;
	81	if (git_futils_readbuffer(&buf, path.ptr) < 0)
	82	goto err;
	83	git_buf_free(&path);
	84
	85	git_buf_rtrim(&buf);
	86
	87	if (!git_path_is_relative(buf.ptr))
	88	return git_buf_detach(&buf);
	89
	90	if (git_buf_sets(&path, base) < 0)
	91	goto err;
	92	if (git_path_apply_relative(&path, buf.ptr) < 0)
	93	goto err;
	94	git_buf_free(&buf);
	95
	96	return git_buf_detach(&path);
	97
	98	err:
	99	git_buf_free(&buf);
	100	git_buf_free(&path);
	101
	102	return NULL;
	103	}
	104
dea7488e PS	105	static int write_wtfile(const char base, const char file, const git_buf *buf)
	106	{
	107	git_buf path = GIT_BUF_INIT;
	108	int err;
	109
	110	assert(base && file && buf);
	111
	112	if ((err = git_buf_joinpath(&path, base, file)) < 0)
	113	goto out;
	114
	115	if ((err = git_futils_writebuffer(buf, path.ptr, O_CREAT\|O_EXCL\|O_WRONLY, 0644)) < 0)
	116	goto out;
	117
	118	out:
	119	git_buf_free(&path);
	120
	121	return err;
	122	}
	123
dfc98706	124	static int open_worktree_dir(git_worktree *out, const char parent, const char dir, const char name)
d3bc09e8	125	{
dfc98706	126	git_buf gitdir = GIT_BUF_INIT;
d3bc09e8	127	git_worktree *wt = NULL;
dfc98706	128	int error = 0;
d3bc09e8	129
dfc98706	130	if (!is_worktree_dir(dir)) {
d3bc09e8 PS	131	error = -1;
	132	goto out;
	133	}
	134
dfc98706	135	if ((wt = git__calloc(1, sizeof(struct git_repository))) == NULL) {
d3bc09e8 PS	136	error = -1;
	137	goto out;
	138	}
	139
	140	if ((wt->name = git__strdup(name)) == NULL
dfc98706 PS	141	\|\| (wt->commondir_path = git_worktree__read_link(dir, "commondir")) == NULL
	142	\|\| (wt->gitlink_path = git_worktree__read_link(dir, "gitdir")) == NULL
	143	\|\| (wt->parent_path = git__strdup(parent)) == NULL) {
d3bc09e8 PS	144	error = -1;
	145	goto out;
	146	}
dfc98706 PS	147
	148	if ((error = git_path_prettify_dir(&gitdir, dir, NULL)) < 0)
	149	goto out;
	150	wt->gitdir_path = git_buf_detach(&gitdir);
	151
2a503485	152	wt->locked = !!git_worktree_is_locked(NULL, wt);
d3bc09e8	153
dfc98706 PS	154	*out = wt;
	155
	156	out:
	157	if (error)
	158	git_worktree_free(wt);
	159	git_buf_free(&gitdir);
	160
	161	return error;
	162	}
	163
	164	int git_worktree_lookup(git_worktree *out, git_repository repo, const char *name)
	165	{
	166	git_buf path = GIT_BUF_INIT;
	167	git_worktree *wt = NULL;
	168	int error;
	169
	170	assert(repo && name);
	171
	172	*out = NULL;
	173
	174	if ((error = git_buf_printf(&path, "%s/worktrees/%s", repo->commondir, name)) < 0)
	175	goto out;
	176
20a368e2	177	if ((error = (open_worktree_dir(out, git_repository_workdir(repo), path.ptr, name))) < 0)
dfc98706	178	goto out;
d3bc09e8 PS	179
	180	out:
	181	git_buf_free(&path);
	182
	183	if (error)
	184	git_worktree_free(wt);
	185
	186	return error;
	187	}
	188
3017ba94 PS	189	int git_worktree_open_from_repository(git_worktree *out, git_repository repo)
	190	{
	191	git_buf parent = GIT_BUF_INIT;
	192	const char gitdir, commondir;
	193	char *name = NULL;
	194	int error = 0;
	195
	196	if (!git_repository_is_worktree(repo)) {
	197	giterr_set(GITERR_WORKTREE, "cannot open worktree of a non-worktree repo");
	198	error = -1;
	199	goto out;
	200	}
	201
	202	gitdir = git_repository_path(repo);
	203	commondir = git_repository_commondir(repo);
	204
20a368e2	205	if ((error = git_path_prettify_dir(&parent, "..", commondir)) < 0)
3017ba94 PS	206	goto out;
	207
	208	/* The name is defined by the last component in '.git/worktree/%s' */
	209	name = git_path_basename(gitdir);
	210
	211	if ((error = open_worktree_dir(out, parent.ptr, gitdir, name)) < 0)
	212	goto out;
	213
	214	out:
9be4c303	215	git__free(name);
3017ba94 PS	216	git_buf_free(&parent);
	217
	218	return error;
	219	}
	220
d3bc09e8 PS	221	void git_worktree_free(git_worktree *wt)
	222	{
	223	if (!wt)
	224	return;
	225
	226	git__free(wt->commondir_path);
	227	git__free(wt->gitlink_path);
	228	git__free(wt->gitdir_path);
	229	git__free(wt->parent_path);
	230	git__free(wt->name);
	231	git__free(wt);
	232	}
372dc9ff PS	233
	234	int git_worktree_validate(const git_worktree *wt)
	235	{
	236	git_buf buf = GIT_BUF_INIT;
	237	int err = 0;
	238
	239	assert(wt);
	240
	241	git_buf_puts(&buf, wt->gitdir_path);
3e9c5d8a	242	if (!is_worktree_dir(buf.ptr)) {
372dc9ff PS	243	giterr_set(GITERR_WORKTREE,
	244	"Worktree gitdir ('%s') is not valid",
	245	wt->gitlink_path);
	246	err = -1;
	247	goto out;
	248	}
	249
	250	if (!git_path_exists(wt->parent_path)) {
	251	giterr_set(GITERR_WORKTREE,
	252	"Worktree parent directory ('%s') does not exist ",
	253	wt->parent_path);
	254	err = -2;
	255	goto out;
	256	}
	257
	258	if (!git_path_exists(wt->commondir_path)) {
	259	giterr_set(GITERR_WORKTREE,
	260	"Worktree common directory ('%s') does not exist ",
	261	wt->commondir_path);
	262	err = -3;
	263	goto out;
	264	}
	265
	266	out:
	267	git_buf_free(&buf);
	268
	269	return err;
	270	}
dea7488e	271
a7aa73a5 PS	272	int git_worktree_add_init_options(git_worktree_add_options *opts,
	273	unsigned int version)
	274	{
	275	GIT_INIT_STRUCTURE_FROM_TEMPLATE(opts, version,
	276	git_worktree_add_options, GIT_WORKTREE_ADD_OPTIONS_INIT);
	277	return 0;
	278	}
	279
	280	int git_worktree_add(git_worktree *out, git_repository repo,
	281	const char name, const char worktree,
	282	const git_worktree_add_options *opts)
dea7488e	283	{
8f154be3	284	git_buf gitdir = GIT_BUF_INIT, wddir = GIT_BUF_INIT, buf = GIT_BUF_INIT;
dea7488e PS	285	git_reference ref = NULL, head = NULL;
	286	git_commit *commit = NULL;
	287	git_repository *wt = NULL;
	288	git_checkout_options coopts = GIT_CHECKOUT_OPTIONS_INIT;
a7aa73a5	289	git_worktree_add_options wtopts = GIT_WORKTREE_ADD_OPTIONS_INIT;
dea7488e PS	290	int err;
dea7488e PS	291
a7aa73a5 PS	292	GITERR_CHECK_VERSION(
	293	opts, GIT_WORKTREE_ADD_OPTIONS_VERSION, "git_worktree_add_options");
	294
	295	if (opts)
	296	memcpy(&wtopts, opts, sizeof(wtopts));
	297
dea7488e PS	298	assert(out && repo && name && worktree);
	299
	300	*out = NULL;
	301
7cf7a407 PS	302	/* Create gitdir directory ".git/worktrees/<name>" */
7cf7a407 PS	303	if ((err = git_buf_joinpath(&gitdir, repo->commondir, "worktrees")) < 0)
dea7488e	304	goto out;
7cf7a407 PS	305	if (!git_path_exists(gitdir.ptr))
7cf7a407 PS	306	if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
dea7488e	307	goto out;
7cf7a407	308	if ((err = git_buf_joinpath(&gitdir, gitdir.ptr, name)) < 0)
dea7488e	309	goto out;
7cf7a407	310	if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
dea7488e	311	goto out;
8f154be3 PS	312	if ((err = git_path_prettify_dir(&gitdir, gitdir.ptr, NULL)) < 0)
8f154be3 PS	313	goto out;
dea7488e PS	314
	315	/* Create worktree work dir */
	316	if ((err = git_futils_mkdir(worktree, 0755, GIT_MKDIR_EXCL)) < 0)
	317	goto out;
8f154be3 PS	318	if ((err = git_path_prettify_dir(&wddir, worktree, NULL)) < 0)
8f154be3 PS	319	goto out;
dea7488e	320
8264a30f PS	321	if (wtopts.lock) {
	322	int fd;
	323
	324	if ((err = git_buf_joinpath(&buf, gitdir.ptr, "locked")) < 0)
	325	goto out;
	326
	327	if ((fd = p_creat(buf.ptr, 0644)) < 0) {
	328	err = fd;
	329	goto out;
	330	}
	331
	332	p_close(fd);
	333	git_buf_clear(&buf);
	334	}
	335
dea7488e	336	/* Create worktree .git file */
7cf7a407	337	if ((err = git_buf_printf(&buf, "gitdir: %s\n", gitdir.ptr)) < 0)
dea7488e	338	goto out;
8f154be3	339	if ((err = write_wtfile(wddir.ptr, ".git", &buf)) < 0)
dea7488e PS	340	goto out;
dea7488e PS	341
7cf7a407	342	/* Create gitdir files */
8f154be3	343	if ((err = git_path_prettify_dir(&buf, repo->commondir, NULL) < 0)
dea7488e	344	\|\| (err = git_buf_putc(&buf, '\n')) < 0
7cf7a407	345	\|\| (err = write_wtfile(gitdir.ptr, "commondir", &buf)) < 0)
dea7488e	346	goto out;
8f154be3	347	if ((err = git_buf_joinpath(&buf, wddir.ptr, ".git")) < 0
dea7488e	348	\|\| (err = git_buf_putc(&buf, '\n')) < 0
7cf7a407	349	\|\| (err = write_wtfile(gitdir.ptr, "gitdir", &buf)) < 0)
dea7488e PS	350	goto out;
	351
	352	/* Create new branch */
	353	if ((err = git_repository_head(&head, repo)) < 0)
	354	goto out;
	355	if ((err = git_commit_lookup(&commit, repo, &head->target.oid)) < 0)
	356	goto out;
	357	if ((err = git_branch_create(&ref, repo, name, commit, false)) < 0)
	358	goto out;
	359
	360	/* Set worktree's HEAD */
7cf7a407	361	if ((err = git_repository_create_head(gitdir.ptr, git_reference_name(ref))) < 0)
dea7488e	362	goto out;
8f154be3	363	if ((err = git_repository_open(&wt, wddir.ptr)) < 0)
dea7488e PS	364	goto out;
	365
	366	/* Checkout worktree's HEAD */
	367	coopts.checkout_strategy = GIT_CHECKOUT_FORCE;
	368	if ((err = git_checkout_head(wt, &coopts)) < 0)
	369	goto out;
	370
	371	/* Load result */
	372	if ((err = git_worktree_lookup(out, repo, name)) < 0)
	373	goto out;
	374
	375	out:
7cf7a407	376	git_buf_free(&gitdir);
8f154be3	377	git_buf_free(&wddir);
dea7488e PS	378	git_buf_free(&buf);
	379	git_reference_free(ref);
	380	git_reference_free(head);
	381	git_commit_free(commit);
	382	git_repository_free(wt);
	383
	384	return err;
	385	}
2a503485 PS	386
	387	int git_worktree_lock(git_worktree wt, char creason)
	388	{
	389	git_buf buf = GIT_BUF_INIT, path = GIT_BUF_INIT;
	390	int err;
	391
	392	assert(wt);
	393
	394	if ((err = git_worktree_is_locked(NULL, wt)) < 0)
	395	goto out;
	396
	397	if ((err = git_buf_joinpath(&path, wt->gitdir_path, "locked")) < 0)
	398	goto out;
	399
	400	if (creason)
	401	git_buf_attach_notowned(&buf, creason, strlen(creason));
	402
	403	if ((err = git_futils_writebuffer(&buf, path.ptr, O_CREAT\|O_EXCL\|O_WRONLY, 0644)) < 0)
	404	goto out;
	405
	406	wt->locked = 1;
	407
	408	out:
	409	git_buf_free(&path);
	410
	411	return err;
	412	}
	413
	414	int git_worktree_unlock(git_worktree *wt)
	415	{
	416	git_buf path = GIT_BUF_INIT;
	417
	418	assert(wt);
	419
	420	if (!git_worktree_is_locked(NULL, wt))
	421	return 0;
	422
	423	if (git_buf_joinpath(&path, wt->gitdir_path, "locked") < 0)
	424	return -1;
	425
	426	if (p_unlink(path.ptr) != 0) {
	427	git_buf_free(&path);
	428	return -1;
	429	}
	430
	431	wt->locked = 0;
	432
	433	git_buf_free(&path);
	434
	435	return 0;
	436	}
	437
	438	int git_worktree_is_locked(git_buf reason, const git_worktree wt)
	439	{
	440	git_buf path = GIT_BUF_INIT;
	441	int ret;
	442
	443	assert(wt);
	444
	445	if (reason)
	446	git_buf_clear(reason);
	447
	448	if ((ret = git_buf_joinpath(&path, wt->gitdir_path, "locked")) < 0)
	449	goto out;
450	if ((ret = git_path_exists(path.ptr)) && reason)
451	git_futils_readbuffer(reason, path.ptr);
452
453	out:
454	git_buf_free(&path);
455
456	return ret;
457	}
f0cfc341	458
883eeb5f PS	459	int git_worktree_prune_init_options(
	460	git_worktree_prune_options *opts,
	461	unsigned int version)
	462	{
	463	GIT_INIT_STRUCTURE_FROM_TEMPLATE(opts, version,
	464	git_worktree_prune_options, GIT_WORKTREE_PRUNE_OPTIONS_INIT);
	465	return 0;
	466	}
	467
	468	int git_worktree_is_prunable(git_worktree *wt,
	469	git_worktree_prune_options *opts)
f0cfc341	470	{
1ba242c9	471	git_buf reason = GIT_BUF_INIT;
883eeb5f PS	472	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
	473
	474	GITERR_CHECK_VERSION(
	475	opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
	476	"git_worktree_prune_options");
	477
	478	if (opts)
	479	memcpy(&popts, opts, sizeof(popts));
f0cfc341	480
883eeb5f	481	if ((popts.flags & GIT_WORKTREE_PRUNE_LOCKED) == 0 &&
f0cfc341 PS	482	git_worktree_is_locked(&reason, wt))
	483	{
	484	if (!reason.size)
	485	git_buf_attach_notowned(&reason, "no reason given", 15);
	486	giterr_set(GITERR_WORKTREE, "Not pruning locked working tree: '%s'", reason.ptr);
1ba242c9	487	git_buf_free(&reason);
f0cfc341	488
1ba242c9	489	return 0;
f0cfc341 PS	490	}
f0cfc341 PS	491
883eeb5f	492	if ((popts.flags & GIT_WORKTREE_PRUNE_VALID) == 0 &&
f0cfc341 PS	493	git_worktree_validate(wt) == 0)
	494	{
	495	giterr_set(GITERR_WORKTREE, "Not pruning valid working tree");
1ba242c9 PS	496	return 0;
	497	}
	498
	499	return 1;
	500	}
	501
883eeb5f PS	502	int git_worktree_prune(git_worktree *wt,
883eeb5f PS	503	git_worktree_prune_options *opts)
1ba242c9	504	{
883eeb5f	505	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
1ba242c9 PS	506	git_buf path = GIT_BUF_INIT;
	507	char *wtpath;
	508	int err;
	509
883eeb5f PS	510	GITERR_CHECK_VERSION(
	511	opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
	512	"git_worktree_prune_options");
	513
	514	if (opts)
	515	memcpy(&popts, opts, sizeof(popts));
	516
	517	if (!git_worktree_is_prunable(wt, &popts)) {
f0cfc341 PS	518	err = -1;
	519	goto out;
	520	}
	521
	522	/* Delete gitdir in parent repository */
20a368e2	523	if ((err = git_buf_printf(&path, "%s/worktrees/%s", wt->commondir_path, wt->name)) < 0)
f0cfc341 PS	524	goto out;
	525	if (!git_path_exists(path.ptr))
	526	{
	527	giterr_set(GITERR_WORKTREE, "Worktree gitdir '%s' does not exist", path.ptr);
	528	err = -1;
	529	goto out;
	530	}
	531	if ((err = git_futils_rmdir_r(path.ptr, NULL, GIT_RMDIR_REMOVE_FILES)) < 0)
	532	goto out;
	533
	534	/* Skip deletion of the actual working tree if it does
	535	* not exist or deletion was not requested */
883eeb5f	536	if ((popts.flags & GIT_WORKTREE_PRUNE_WORKING_TREE) == 0 \|\|
f0cfc341 PS	537	!git_path_exists(wt->gitlink_path))
	538	{
	539	goto out;
	540	}
	541
	542	if ((wtpath = git_path_dirname(wt->gitlink_path)) == NULL)
	543	goto out;
	544	git_buf_attach(&path, wtpath, 0);
	545	if (!git_path_exists(path.ptr))
	546	{
	547	giterr_set(GITERR_WORKTREE, "Working tree '%s' does not exist", path.ptr);
	548	err = -1;
	549	goto out;
	550	}
	551	if ((err = git_futils_rmdir_r(path.ptr, NULL, GIT_RMDIR_REMOVE_FILES)) < 0)
	552	goto out;
	553
	554	out:
f0cfc341 PS	555	git_buf_free(&path);
	556
	557	return err;
	558	}