[thirdparty/git.git] / setup.c

#include "cache.h"
#include "dir.h"

static int inside_git_dir = -1;
static int inside_work_tree = -1;

const char *prefix_path(const char *prefix, int len, const char *path)
{
	const char *orig = path;
	for (;;) {
		char c;
		if (*path != '.')
			break;
		c = path[1];
		/* "." */
		if (!c) {
			path++;
			break;
		}
		/* "./" */
		if (c == '/') {
			path += 2;
			continue;
		}
		if (c != '.')
			break;
		c = path[2];
		if (!c)
			path += 2;
		else if (c == '/')
			path += 3;
		else
			break;
		/* ".." and "../" */
		/* Remove last component of the prefix */
		do {
			if (!len)
				die("'%s' is outside repository", orig);
			len--;
		} while (len && prefix[len-1] != '/');
		continue;
	}
	if (len) {
		int speclen = strlen(path);
		char *n = xmalloc(speclen + len + 1);

		memcpy(n, prefix, len);
		memcpy(n + len, path, speclen+1);
		path = n;
	}
	return path;
}

/*
 * Unlike prefix_path, this should be used if the named file does
 * not have to interact with index entry; i.e. name of a random file
 * on the filesystem.
 */
const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
{
	static char path[PATH_MAX];
	if (!pfx || !*pfx || arg[0] == '/')
		return arg;
	memcpy(path, pfx, pfx_len);
	strcpy(path + pfx_len, arg);
	return path;
}

/*
 * Verify a filename that we got as an argument for a pathspec
 * entry. Note that a filename that begins with "-" never verifies
 * as true, because even if such a filename were to exist, we want
 * it to be preceded by the "--" marker (or we want the user to
 * use a format like "./-filename")
 */
void verify_filename(const char *prefix, const char *arg)
{
	const char *name;
	struct stat st;

	if (*arg == '-')
		die("bad flag '%s' used after filename", arg);
	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	if (!lstat(name, &st))
		return;
	if (errno == ENOENT)
		die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
		    "Use '--' to separate paths from revisions", arg);
	die("'%s': %s", arg, strerror(errno));
}

/*
 * Opposite of the above: the command line did not have -- marker
 * and we parsed the arg as a refname.  It should not be interpretable
 * as a filename.
 */
void verify_non_filename(const char *prefix, const char *arg)
{
	const char *name;
	struct stat st;

	if (!is_inside_work_tree() || is_inside_git_dir())
		return;
	if (*arg == '-')
		return; /* flag */
	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	if (!lstat(name, &st))
		die("ambiguous argument '%s': both revision and filename\n"
		    "Use '--' to separate filenames from revisions", arg);
	if (errno != ENOENT && errno != ENOTDIR)
		die("'%s': %s", arg, strerror(errno));
}

const char **get_pathspec(const char *prefix, const char **pathspec)
{
	const char *entry = *pathspec;
	const char **p;
	int prefixlen;

	if (!prefix && !entry)
		return NULL;

	if (!entry) {
		static const char *spec[2];
		spec[0] = prefix;
		spec[1] = NULL;
		return spec;
	}

	/* Otherwise we have to re-write the entries.. */
	p = pathspec;
	prefixlen = prefix ? strlen(prefix) : 0;
	do {
		*p = prefix_path(prefix, prefixlen, entry);
	} while ((entry = *++p) != NULL);
	return (const char **) pathspec;
}

/*
 * Test if it looks like we're at a git directory.
 * We want to see:
 *
 *  - either a objects/ directory _or_ the proper
 *    GIT_OBJECT_DIRECTORY environment variable
 *  - a refs/ directory
 *  - either a HEAD symlink or a HEAD file that is formatted as
 *    a proper "ref:", or a regular file HEAD that has a properly
 *    formatted sha1 object name.
 */
static int is_git_directory(const char *suspect)
{
	char path[PATH_MAX];
	size_t len = strlen(suspect);

	strcpy(path, suspect);
	if (getenv(DB_ENVIRONMENT)) {
		if (access(getenv(DB_ENVIRONMENT), X_OK))
			return 0;
	}
	else {
		strcpy(path + len, "/objects");
		if (access(path, X_OK))
			return 0;
	}

	strcpy(path + len, "/refs");
	if (access(path, X_OK))
		return 0;

	strcpy(path + len, "/HEAD");
	if (validate_headref(path))
		return 0;

	return 1;
}

int is_inside_git_dir(void)
{
	if (inside_git_dir < 0)
		inside_git_dir = is_inside_dir(get_git_dir());
	return inside_git_dir;
}

int is_inside_work_tree(void)
{
	if (inside_work_tree < 0)
		inside_work_tree = is_inside_dir(get_git_work_tree());
	return inside_work_tree;
}

/*
 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
 * The old behaviour (which we retain here) is to set the work tree root
 * to the cwd, unless overridden by the config, the command line, or
 * GIT_WORK_TREE.
 */
static const char *set_work_tree(const char *dir)
{
	char buffer[PATH_MAX + 1];

	if (!getcwd(buffer, sizeof(buffer)))
		die ("Could not get the current working directory");
	git_work_tree_cfg = xstrdup(buffer);
	inside_work_tree = 1;

	return NULL;
}

void setup_work_tree(void)
{
	const char *work_tree = get_git_work_tree();
	const char *git_dir = get_git_dir();
	if (!is_absolute_path(git_dir))
		set_git_dir(make_absolute_path(git_dir));
	if (!work_tree || chdir(work_tree))
		die("This operation must be run in a work tree");
}

/*
 * We cannot decide in this function whether we are in the work tree or
 * not, since the config can only be read _after_ this function was called.
 */
const char *setup_git_directory_gently(int *nongit_ok)
{
	const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
	static char cwd[PATH_MAX+1];
	const char *gitdirenv;
	int len, offset;

	/*
	 * If GIT_DIR is set explicitly, we're not going
	 * to do any discovery, but we still do repository
	 * validation.
	 */
	gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
	if (gitdirenv) {
		if (PATH_MAX - 40 < strlen(gitdirenv))
			die("'$%s' too big", GIT_DIR_ENVIRONMENT);
		if (is_git_directory(gitdirenv)) {
			static char buffer[1024 + 1];
			const char *retval;

			if (!work_tree_env)
				return set_work_tree(gitdirenv);
			retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
					get_git_work_tree());
			if (!retval || !*retval)
				return NULL;
			set_git_dir(make_absolute_path(gitdirenv));
			if (chdir(work_tree_env) < 0)
				die ("Could not chdir to %s", work_tree_env);
			strcat(buffer, "/");
			return retval;
		}
		if (nongit_ok) {
			*nongit_ok = 1;
			return NULL;
		}
		die("Not a git repository: '%s'", gitdirenv);
	}

	if (!getcwd(cwd, sizeof(cwd)-1))
		die("Unable to read current working directory");

	/*
	 * Test in the following order (relative to the cwd):
	 * - .git/
	 * - ./ (bare)
	 * - ../.git/
	 * - ../ (bare)
	 * - ../../.git/
	 *   etc.
	 */
	offset = len = strlen(cwd);
	for (;;) {
		if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
			break;
		if (is_git_directory(".")) {
			inside_git_dir = 1;
			if (!work_tree_env)
				inside_work_tree = 0;
			setenv(GIT_DIR_ENVIRONMENT, ".", 1);
			return NULL;
		}
		chdir("..");
		do {
			if (!offset) {
				if (nongit_ok) {
					if (chdir(cwd))
						die("Cannot come back to cwd");
					*nongit_ok = 1;
					return NULL;
				}
				die("Not a git repository");
			}
		} while (cwd[--offset] != '/');
	}

	inside_git_dir = 0;
	if (!work_tree_env)
		inside_work_tree = 1;
	git_work_tree_cfg = xstrndup(cwd, offset);
	if (offset == len)
		return NULL;

	/* Make "offset" point to past the '/', and add a '/' at the end */
	offset++;
	cwd[len++] = '/';
	cwd[len] = 0;
	return cwd + offset;
}

int git_config_perm(const char *var, const char *value)
{
	if (value) {
		int i;
		if (!strcmp(value, "umask"))
			return PERM_UMASK;
		if (!strcmp(value, "group"))
			return PERM_GROUP;
		if (!strcmp(value, "all") ||
		    !strcmp(value, "world") ||
		    !strcmp(value, "everybody"))
			return PERM_EVERYBODY;
		i = atoi(value);
		if (i > 1)
			return i;
	}
	return git_config_bool(var, value);
}

int check_repository_format_version(const char *var, const char *value)
{
	if (strcmp(var, "core.repositoryformatversion") == 0)
		repository_format_version = git_config_int(var, value);
	else if (strcmp(var, "core.sharedrepository") == 0)
		shared_repository = git_config_perm(var, value);
	else if (strcmp(var, "core.bare") == 0) {
		is_bare_repository_cfg = git_config_bool(var, value);
		if (is_bare_repository_cfg == 1)
			inside_work_tree = -1;
	} else if (strcmp(var, "core.worktree") == 0) {
		if (git_work_tree_cfg)
			free(git_work_tree_cfg);
		git_work_tree_cfg = xstrdup(value);
		inside_work_tree = -1;
	}
	return 0;
}

int check_repository_format(void)
{
	git_config(check_repository_format_version);
	if (GIT_REPO_VERSION < repository_format_version)
		die ("Expected git repo version <= %d, found %d",
		     GIT_REPO_VERSION, repository_format_version);
	return 0;
}

const char *setup_git_directory(void)
{
	const char *retval = setup_git_directory_gently(NULL);
	check_repository_format();

	/* If the work tree is not the default one, recompute prefix */
	if (inside_work_tree < 0) {
		static char buffer[PATH_MAX + 1];
		char *rel;
		if (retval && chdir(retval))
			die ("Could not jump back into original cwd");
		rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
		return rel && *rel ? strcat(rel, "/") : NULL;
	}

	return retval;
}
Commit	Line	Data
d288a700	1	#include "cache.h"
e90fdc39 JS	2	#include "dir.h"
	3
	4	static int inside_git_dir = -1;
	5	static int inside_work_tree = -1;
d288a700	6
6b5ee137	7	const char prefix_path(const char prefix, int len, const char *path)
f332726e	8	{
6b5ee137	9	const char *orig = path;
f332726e LT	10	for (;;) {
	11	char c;
	12	if (*path != '.')
	13	break;
	14	c = path[1];
	15	/* "." */
	16	if (!c) {
	17	path++;
	18	break;
	19	}
	20	/* "./" */
	21	if (c == '/') {
	22	path += 2;
	23	continue;
	24	}
	25	if (c != '.')
	26	break;
	27	c = path[2];
	28	if (!c)
	29	path += 2;
	30	else if (c == '/')
	31	path += 3;
	32	else
	33	break;
	34	/* ".." and "../" */
	35	/* Remove last component of the prefix */
	36	do {
	37	if (!len)
	38	die("'%s' is outside repository", orig);
	39	len--;
	40	} while (len && prefix[len-1] != '/');
	41	continue;
	42	}
	43	if (len) {
	44	int speclen = strlen(path);
	45	char *n = xmalloc(speclen + len + 1);
a6080a0a	46
f332726e LT	47	memcpy(n, prefix, len);
	48	memcpy(n + len, path, speclen+1);
	49	path = n;
	50	}
	51	return path;
	52	}
	53
a6080a0a	54	/*
4ca06608 JH	55	* Unlike prefix_path, this should be used if the named file does
	56	* not have to interact with index entry; i.e. name of a random file
	57	* on the filesystem.
	58	*/
	59	const char prefix_filename(const char pfx, int pfx_len, const char *arg)
	60	{
	61	static char path[PATH_MAX];
	62	if (!pfx \|\| !*pfx \|\| arg[0] == '/')
	63	return arg;
	64	memcpy(path, pfx, pfx_len);
	65	strcpy(path + pfx_len, arg);
	66	return path;
	67	}
	68
e23d0b4a LT	69	/*
	70	* Verify a filename that we got as an argument for a pathspec
	71	* entry. Note that a filename that begins with "-" never verifies
	72	* as true, because even if such a filename were to exist, we want
	73	* it to be preceded by the "--" marker (or we want the user to
	74	* use a format like "./-filename")
	75	*/
	76	void verify_filename(const char prefix, const char arg)
	77	{
	78	const char *name;
	79	struct stat st;
	80
	81	if (*arg == '-')
	82	die("bad flag '%s' used after filename", arg);
	83	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	84	if (!lstat(name, &st))
	85	return;
	86	if (errno == ENOENT)
ea92f41f JH	87	die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
ea92f41f JH	88	"Use '--' to separate paths from revisions", arg);
e23d0b4a LT	89	die("'%s': %s", arg, strerror(errno));
	90	}
	91
ea92f41f JH	92	/*
	93	* Opposite of the above: the command line did not have -- marker
	94	* and we parsed the arg as a refname. It should not be interpretable
	95	* as a filename.
	96	*/
	97	void verify_non_filename(const char prefix, const char arg)
	98	{
	99	const char *name;
	100	struct stat st;
	101
7ae3df8c	102	if (!is_inside_work_tree() \|\| is_inside_git_dir())
68025633	103	return;
ea92f41f JH	104	if (*arg == '-')
	105	return; /* flag */
	106	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	107	if (!lstat(name, &st))
	108	die("ambiguous argument '%s': both revision and filename\n"
	109	"Use '--' to separate filenames from revisions", arg);
33a798c8	110	if (errno != ENOENT && errno != ENOTDIR)
ea92f41f JH	111	die("'%s': %s", arg, strerror(errno));
	112	}
	113
6b5ee137	114	const char *get_pathspec(const char prefix, const char **pathspec)
d288a700	115	{
6b5ee137 JH	116	const char entry = pathspec;
6b5ee137 JH	117	const char **p;
d288a700 LT	118	int prefixlen;
d288a700 LT	119
f332726e LT	120	if (!prefix && !entry)
f332726e LT	121	return NULL;
d288a700 LT	122
	123	if (!entry) {
	124	static const char *spec[2];
	125	spec[0] = prefix;
	126	spec[1] = NULL;
	127	return spec;
	128	}
	129
	130	/* Otherwise we have to re-write the entries.. */
d288a700	131	p = pathspec;
f332726e	132	prefixlen = prefix ? strlen(prefix) : 0;
d288a700	133	do {
f332726e	134	*p = prefix_path(prefix, prefixlen, entry);
d288a700 LT	135	} while ((entry = *++p) != NULL);
	136	return (const char **) pathspec;
	137	}
	138
5f5608bc	139	/*
ad1a382f	140	* Test if it looks like we're at a git directory.
5e7bfe25	141	* We want to see:
5f5608bc	142	*
ad1a382f	143	* - either a objects/ directory _or_ the proper
5f5608bc	144	* GIT_OBJECT_DIRECTORY environment variable
ad1a382f	145	* - a refs/ directory
8098a178	146	* - either a HEAD symlink or a HEAD file that is formatted as
c847f537 JH	147	* a proper "ref:", or a regular file HEAD that has a properly
c847f537 JH	148	* formatted sha1 object name.
5f5608bc	149	*/
ad1a382f	150	static int is_git_directory(const char *suspect)
5f5608bc	151	{
ad1a382f SP	152	char path[PATH_MAX];
	153	size_t len = strlen(suspect);
	154
	155	strcpy(path, suspect);
	156	if (getenv(DB_ENVIRONMENT)) {
	157	if (access(getenv(DB_ENVIRONMENT), X_OK))
	158	return 0;
	159	}
	160	else {
	161	strcpy(path + len, "/objects");
	162	if (access(path, X_OK))
	163	return 0;
	164	}
	165
	166	strcpy(path + len, "/refs");
	167	if (access(path, X_OK))
8098a178	168	return 0;
ad1a382f SP	169
ad1a382f SP	170	strcpy(path + len, "/HEAD");
c847f537	171	if (validate_headref(path))
ad1a382f SP	172	return 0;
ad1a382f SP	173
8098a178	174	return 1;
5f5608bc LT	175	}
5f5608bc LT	176
68025633 JS	177	int is_inside_git_dir(void)
68025633 JS	178	{
e90fdc39 JS	179	if (inside_git_dir < 0)
	180	inside_git_dir = is_inside_dir(get_git_dir());
	181	return inside_git_dir;
892c41b9 ML	182	}
892c41b9 ML	183
892c41b9 ML	184	int is_inside_work_tree(void)
892c41b9 ML	185	{
e90fdc39 JS	186	if (inside_work_tree < 0)
	187	inside_work_tree = is_inside_dir(get_git_work_tree());
	188	return inside_work_tree;
892c41b9 ML	189	}
892c41b9 ML	190
e90fdc39	191	/*
7efeb8f0 JS	192	* set_work_tree() is only ever called if you set GIT_DIR explicitely.
	193	* The old behaviour (which we retain here) is to set the work tree root
	194	* to the cwd, unless overridden by the config, the command line, or
	195	* GIT_WORK_TREE.
e90fdc39	196	*/
7efeb8f0	197	static const char set_work_tree(const char dir)
892c41b9	198	{
7efeb8f0	199	char buffer[PATH_MAX + 1];
e90fdc39	200
7efeb8f0 JS	201	if (!getcwd(buffer, sizeof(buffer)))
	202	die ("Could not get the current working directory");
	203	git_work_tree_cfg = xstrdup(buffer);
e90fdc39 JS	204	inside_work_tree = 1;
e90fdc39 JS	205
7efeb8f0	206	return NULL;
68025633 JS	207	}
68025633 JS	208
f3fa1838 JH	209	void setup_work_tree(void)
f3fa1838 JH	210	{
59f0f2f3 MH	211	const char *work_tree = get_git_work_tree();
	212	const char *git_dir = get_git_dir();
	213	if (!is_absolute_path(git_dir))
	214	set_git_dir(make_absolute_path(git_dir));
	215	if (!work_tree \|\| chdir(work_tree))
	216	die("This operation must be run in a work tree");
	217	}
	218
e90fdc39 JS	219	/*
	220	* We cannot decide in this function whether we are in the work tree or
	221	* not, since the config can only be read _after_ this function was called.
	222	*/
4ca06608	223	const char setup_git_directory_gently(int nongit_ok)
d288a700	224	{
e90fdc39	225	const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
d288a700	226	static char cwd[PATH_MAX+1];
e90fdc39 JS	227	const char *gitdirenv;
e90fdc39 JS	228	int len, offset;
d288a700	229
e90fdc39 JS	230	/*
	231	* If GIT_DIR is set explicitly, we're not going
	232	* to do any discovery, but we still do repository
	233	* validation.
	234	*/
ad1a382f	235	gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e90fdc39 JS	236	if (gitdirenv) {
	237	if (PATH_MAX - 40 < strlen(gitdirenv))
	238	die("'$%s' too big", GIT_DIR_ENVIRONMENT);
	239	if (is_git_directory(gitdirenv)) {
dd5c8af1 JS	240	static char buffer[1024 + 1];
	241	const char *retval;
	242
e90fdc39 JS	243	if (!work_tree_env)
e90fdc39 JS	244	return set_work_tree(gitdirenv);
dd5c8af1 JS	245	retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
	246	get_git_work_tree());
	247	if (!retval \|\| !*retval)
	248	return NULL;
	249	set_git_dir(make_absolute_path(gitdirenv));
	250	if (chdir(work_tree_env) < 0)
	251	die ("Could not chdir to %s", work_tree_env);
	252	strcat(buffer, "/");
	253	return retval;
892c41b9	254	}
3a3c3fc4	255	if (nongit_ok) {
41e95f69 ML	256	*nongit_ok = 1;
	257	return NULL;
	258	}
ad1a382f	259	die("Not a git repository: '%s'", gitdirenv);
5e7bfe25	260	}
d288a700	261
f66a4d68	262	if (!getcwd(cwd, sizeof(cwd)-1))
d288a700 LT	263	die("Unable to read current working directory");
d288a700 LT	264
892c41b9	265	/*
e90fdc39 JS	266	* Test in the following order (relative to the cwd):
	267	* - .git/
	268	* - ./ (bare)
	269	* - ../.git/
	270	* - ../ (bare)
	271	* - ../../.git/
	272	* etc.
892c41b9	273	*/
e90fdc39 JS	274	offset = len = strlen(cwd);
	275	for (;;) {
	276	if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
	277	break;
	278	if (is_git_directory(".")) {
	279	inside_git_dir = 1;
	280	if (!work_tree_env)
	281	inside_work_tree = 0;
	282	setenv(GIT_DIR_ENVIRONMENT, ".", 1);
892c41b9 ML	283	return NULL;
892c41b9 ML	284	}
e90fdc39 JS	285	chdir("..");
	286	do {
	287	if (!offset) {
	288	if (nongit_ok) {
	289	if (chdir(cwd))
	290	die("Cannot come back to cwd");
	291	*nongit_ok = 1;
	292	return NULL;
	293	}
	294	die("Not a git repository");
	295	}
	296	} while (cwd[--offset] != '/');
892c41b9 ML	297	}
892c41b9 ML	298
e90fdc39 JS	299	inside_git_dir = 0;
	300	if (!work_tree_env)
	301	inside_work_tree = 1;
	302	git_work_tree_cfg = xstrndup(cwd, offset);
	303	if (offset == len)
d288a700 LT	304	return NULL;
d288a700 LT	305
e90fdc39 JS	306	/* Make "offset" point to past the '/', and add a '/' at the end */
	307	offset++;
	308	cwd[len++] = '/';
	309	cwd[len] = 0;
	310	return cwd + offset;
d288a700	311	}
5e7bfe25	312
94df2506 JH	313	int git_config_perm(const char var, const char value)
	314	{
	315	if (value) {
83525227	316	int i;
94df2506 JH	317	if (!strcmp(value, "umask"))
	318	return PERM_UMASK;
	319	if (!strcmp(value, "group"))
	320	return PERM_GROUP;
	321	if (!strcmp(value, "all") \|\|
	322	!strcmp(value, "world") \|\|
	323	!strcmp(value, "everybody"))
	324	return PERM_EVERYBODY;
83525227 JS	325	i = atoi(value);
	326	if (i > 1)
	327	return i;
94df2506 JH	328	}
	329	return git_config_bool(var, value);
	330	}
	331
ab9cb76f JH	332	int check_repository_format_version(const char var, const char value)
ab9cb76f JH	333	{
299726d5 JS	334	if (strcmp(var, "core.repositoryformatversion") == 0)
299726d5 JS	335	repository_format_version = git_config_int(var, value);
457f06d6	336	else if (strcmp(var, "core.sharedrepository") == 0)
94df2506	337	shared_repository = git_config_perm(var, value);
e90fdc39 JS	338	else if (strcmp(var, "core.bare") == 0) {
	339	is_bare_repository_cfg = git_config_bool(var, value);
	340	if (is_bare_repository_cfg == 1)
	341	inside_work_tree = -1;
	342	} else if (strcmp(var, "core.worktree") == 0) {
	343	if (git_work_tree_cfg)
	344	free(git_work_tree_cfg);
	345	git_work_tree_cfg = xstrdup(value);
	346	inside_work_tree = -1;
	347	}
299726d5	348	return 0;
ab9cb76f JH	349	}
	350
	351	int check_repository_format(void)
	352	{
	353	git_config(check_repository_format_version);
	354	if (GIT_REPO_VERSION < repository_format_version)
	355	die ("Expected git repo version <= %d, found %d",
	356	GIT_REPO_VERSION, repository_format_version);
	357	return 0;
	358	}
	359
5e7bfe25 JH	360	const char *setup_git_directory(void)
5e7bfe25 JH	361	{
4ca06608	362	const char *retval = setup_git_directory_gently(NULL);
22752e4c	363	check_repository_format();
e90fdc39 JS	364
	365	/* If the work tree is not the default one, recompute prefix */
	366	if (inside_work_tree < 0) {
	367	static char buffer[PATH_MAX + 1];
	368	char *rel;
	369	if (retval && chdir(retval))
	370	die ("Could not jump back into original cwd");
	371	rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
	372	return rel && *rel ? strcat(rel, "/") : NULL;
	373	}
	374
5e7bfe25 JH	375	return retval;
5e7bfe25 JH	376	}