[thirdparty/git.git] / setup.c

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

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

static int sanitary_path_copy(char *dst, const char *src)
{
	char *dst0;

	if (has_dos_drive_prefix(src)) {
		*dst++ = *src++;
		*dst++ = *src++;
	}
	dst0 = dst;

	if (is_dir_sep(*src)) {
		*dst++ = '/';
		while (is_dir_sep(*src))
			src++;
	}

	for (;;) {
		char c = *src;

		/*
		 * A path component that begins with . could be
		 * special:
		 * (1) "." and ends   -- ignore and terminate.
		 * (2) "./"           -- ignore them, eat slash and continue.
		 * (3) ".." and ends  -- strip one and terminate.
		 * (4) "../"          -- strip one, eat slash and continue.
		 */
		if (c == '.') {
			if (!src[1]) {
				/* (1) */
				src++;
			} else if (is_dir_sep(src[1])) {
				/* (2) */
				src += 2;
				while (is_dir_sep(*src))
					src++;
				continue;
			} else if (src[1] == '.') {
				if (!src[2]) {
					/* (3) */
					src += 2;
					goto up_one;
				} else if (is_dir_sep(src[2])) {
					/* (4) */
					src += 3;
					while (is_dir_sep(*src))
						src++;
					goto up_one;
				}
			}
		}

		/* copy up to the next '/', and eat all '/' */
		while ((c = *src++) != '\0' && !is_dir_sep(c))
			*dst++ = c;
		if (is_dir_sep(c)) {
			*dst++ = '/';
			while (is_dir_sep(c))
				c = *src++;
			src--;
		} else if (!c)
			break;
		continue;

	up_one:
		/*
		 * dst0..dst is prefix portion, and dst[-1] is '/';
		 * go up one level.
		 */
		dst -= 2; /* go past trailing '/' if any */
		if (dst < dst0)
			return -1;
		while (1) {
			if (dst <= dst0)
				break;
			c = *dst--;
			if (c == '/') {	/* MinGW: cannot be '\\' anymore */
				dst += 2;
				break;
			}
		}
	}
	*dst = '\0';
	return 0;
}

const char *prefix_path(const char *prefix, int len, const char *path)
{
	const char *orig = path;
	char *sanitized = xmalloc(len + strlen(path) + 1);
	if (is_absolute_path(orig))
		strcpy(sanitized, path);
	else {
		if (len)
			memcpy(sanitized, prefix, len);
		strcpy(sanitized + len, path);
	}
	if (sanitary_path_copy(sanitized, sanitized))
		goto error_out;
	if (is_absolute_path(orig)) {
		const char *work_tree = get_git_work_tree();
		size_t len = strlen(work_tree);
		size_t total = strlen(sanitized) + 1;
		if (strncmp(sanitized, work_tree, len) ||
		    (sanitized[len] != '\0' && sanitized[len] != '/')) {
		error_out:
			die("'%s' is outside repository", orig);
		}
		if (sanitized[len] == '/')
			len++;
		memmove(sanitized, sanitized + len, total - len);
	}
	return sanitized;
}

/*
 * 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];
#ifndef __MINGW32__
	if (!pfx || !*pfx || is_absolute_path(arg))
		return arg;
	memcpy(path, pfx, pfx_len);
	strcpy(path + pfx_len, arg);
#else
	char *p;
	/* don't add prefix to absolute paths, but still replace '\' by '/' */
	if (is_absolute_path(arg))
		pfx_len = 0;
	else
		memcpy(path, pfx, pfx_len);
	strcpy(path + pfx_len, arg);
	for (p = path + pfx_len; *p; p++)
		if (*p == '\\')
			*p = '/';
#endif
	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 **src, **dst;
	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.. */
	src = pathspec;
	dst = pathspec;
	prefixlen = prefix ? strlen(prefix) : 0;
	while (*src) {
		const char *p = prefix_path(prefix, prefixlen, *src);
		*(dst++) = p;
		src++;
	}
	*dst = NULL;
	if (!*pathspec)
		return NULL;
	return pathspec;
}

/*
 * Test if it looks like we're at a git directory.
 * We want to see:
 *
 *  - either an 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, *git_dir;
	static int initialized = 0;

	if (initialized)
		return;
	work_tree = get_git_work_tree();
	git_dir = get_git_dir();
	if (!is_absolute_path(git_dir))
		git_dir = make_absolute_path(git_dir);
	if (!work_tree || chdir(work_tree))
		die("This operation must be run in a work tree");
	set_git_dir(make_relative_path(git_dir, work_tree));
	initialized = 1;
}

static int check_repository_format_gently(int *nongit_ok)
{
	git_config(check_repository_format_version, NULL);
	if (GIT_REPO_VERSION < repository_format_version) {
		if (!nongit_ok)
			die ("Expected git repo version <= %d, found %d",
			     GIT_REPO_VERSION, repository_format_version);
		warning("Expected git repo version <= %d, found %d",
			GIT_REPO_VERSION, repository_format_version);
		warning("Please upgrade Git");
		*nongit_ok = -1;
		return -1;
	}
	return 0;
}

/*
 * Try to read the location of the git directory from the .git file,
 * return path to git directory if found.
 */
const char *read_gitfile_gently(const char *path)
{
	char *buf;
	struct stat st;
	int fd;
	size_t len;

	if (stat(path, &st))
		return NULL;
	if (!S_ISREG(st.st_mode))
		return NULL;
	fd = open(path, O_RDONLY);
	if (fd < 0)
		die("Error opening %s: %s", path, strerror(errno));
	buf = xmalloc(st.st_size + 1);
	len = read_in_full(fd, buf, st.st_size);
	close(fd);
	if (len != st.st_size)
		die("Error reading %s", path);
	buf[len] = '\0';
	if (prefixcmp(buf, "gitdir: "))
		die("Invalid gitfile format: %s", path);
	while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
		len--;
	if (len < 9)
		die("No path in gitfile: %s", path);
	buf[len] = '\0';
	if (!is_git_directory(buf + 8))
		die("Not a git repository: %s", buf + 8);
	path = make_absolute_path(buf + 8);
	free(buf);
	return path;
}

/*
 * 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);
	const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
	static char cwd[PATH_MAX+1];
	const char *gitdirenv;
	const char *gitfile_dir;
	int len, offset, ceil_offset;

	/*
	 * Let's assume that we are in a git repository.
	 * If it turns out later that we are somewhere else, the value will be
	 * updated accordingly.
	 */
	if (nongit_ok)
		*nongit_ok = 0;

	/*
	 * 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) {
				retval = set_work_tree(gitdirenv);
				/* config may override worktree */
				if (check_repository_format_gently(nongit_ok))
					return NULL;
				return retval;
			}
			if (check_repository_format_gently(nongit_ok))
				return NULL;
			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");

	ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
	if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
		ceil_offset = 1;

	/*
	 * Test in the following order (relative to the cwd):
	 * - .git (file containing "gitdir: <path>")
	 * - .git/
	 * - ./ (bare)
	 * - ../.git
	 * - ../.git/
	 * - ../ (bare)
	 * - ../../.git/
	 *   etc.
	 */
	offset = len = strlen(cwd);
	for (;;) {
		gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
		if (gitfile_dir) {
			if (set_git_dir(gitfile_dir))
				die("Repository setup failed");
			break;
		}
		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);
			check_repository_format_gently(nongit_ok);
			return NULL;
		}
		while (--offset > ceil_offset && cwd[offset] != '/');
		if (offset <= ceil_offset) {
			if (nongit_ok) {
				if (chdir(cwd))
					die("Cannot come back to cwd");
				*nongit_ok = 1;
				return NULL;
			}
			die("Not a git repository");
		}
		chdir("..");
	}

	inside_git_dir = 0;
	if (!work_tree_env)
		inside_work_tree = 1;
	git_work_tree_cfg = xstrndup(cwd, offset);
	if (check_repository_format_gently(nongit_ok))
		return NULL;
	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)
{
	int i;
	char *endptr;

	if (value == NULL)
		return PERM_GROUP;

	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;

	/* Parse octal numbers */
	i = strtol(value, &endptr, 8);

	/* If not an octal number, maybe true/false? */
	if (*endptr != 0)
		return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;

	/*
	 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
	 * a chmod value.
	 */
	switch (i) {
	case PERM_UMASK:               /* 0 */
		return PERM_UMASK;
	case OLD_PERM_GROUP:           /* 1 */
		return PERM_GROUP;
	case OLD_PERM_EVERYBODY:       /* 2 */
		return PERM_EVERYBODY;
	}

	/* A filemode value was given: 0xxx */

	if ((i & 0600) != 0600)
		die("Problem with core.sharedRepository filemode value "
		    "(0%.3o).\nThe owner of files must always have "
		    "read and write permissions.", i);

	/*
	 * Mask filemode value. Others can not get write permission.
	 * x flags for directories are handled separately.
	 */
	return i & 0666;
}

int check_repository_format_version(const char *var, const char *value, void *cb)
{
	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 (!value)
			return config_error_nonbool(var);
		free(git_work_tree_cfg);
		git_work_tree_cfg = xstrdup(value);
		inside_work_tree = -1;
	}
	return 0;
}

int check_repository_format(void)
{
	return check_repository_format_gently(NULL);
}

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

	/* 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());
		if (rel && *rel && chdir(get_git_work_tree()))
			die ("Could not jump to working directory");
		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
d089ebaa	7	static int sanitary_path_copy(char dst, const char src)
f332726e	8	{
25fe217b	9	char *dst0;
d089ebaa	10
25fe217b JS	11	if (has_dos_drive_prefix(src)) {
	12	dst++ = src++;
	13	dst++ = src++;
	14	}
	15	dst0 = dst;
	16
	17	if (is_dir_sep(*src)) {
d089ebaa	18	*dst++ = '/';
25fe217b	19	while (is_dir_sep(*src))
d089ebaa JH	20	src++;
	21	}
	22
f332726e	23	for (;;) {
d089ebaa JH	24	char c = *src;
	25
	26	/*
	27	* A path component that begins with . could be
	28	* special:
	29	* (1) "." and ends -- ignore and terminate.
	30	* (2) "./" -- ignore them, eat slash and continue.
	31	* (3) ".." and ends -- strip one and terminate.
	32	* (4) "../" -- strip one, eat slash and continue.
	33	*/
	34	if (c == '.') {
4cd148d8	35	if (!src[1]) {
d089ebaa JH	36	/* (1) */
d089ebaa JH	37	src++;
25fe217b	38	} else if (is_dir_sep(src[1])) {
d089ebaa JH	39	/* (2) */
d089ebaa JH	40	src += 2;
25fe217b	41	while (is_dir_sep(*src))
d089ebaa JH	42	src++;
d089ebaa JH	43	continue;
4cd148d8 JS	44	} else if (src[1] == '.') {
4cd148d8 JS	45	if (!src[2]) {
d089ebaa JH	46	/* (3) */
	47	src += 2;
	48	goto up_one;
25fe217b	49	} else if (is_dir_sep(src[2])) {
d089ebaa JH	50	/* (4) */
d089ebaa JH	51	src += 3;
25fe217b	52	while (is_dir_sep(*src))
d089ebaa JH	53	src++;
	54	goto up_one;
	55	}
	56	}
f332726e	57	}
d089ebaa JH	58
d089ebaa JH	59	/* copy up to the next '/', and eat all '/' */
25fe217b	60	while ((c = *src++) != '\0' && !is_dir_sep(c))
d089ebaa	61	*dst++ = c;
25fe217b JS	62	if (is_dir_sep(c)) {
	63	*dst++ = '/';
	64	while (is_dir_sep(c))
d089ebaa JH	65	c = *src++;
	66	src--;
	67	} else if (!c)
f332726e	68	break;
f332726e	69	continue;
d089ebaa JH	70
	71	up_one:
	72	/*
	73	* dst0..dst is prefix portion, and dst[-1] is '/';
	74	* go up one level.
	75	*/
	76	dst -= 2; /* go past trailing '/' if any */
	77	if (dst < dst0)
	78	return -1;
	79	while (1) {
	80	if (dst <= dst0)
	81	break;
	82	c = *dst--;
25fe217b	83	if (c == '/') { /* MinGW: cannot be '\\' anymore */
d089ebaa JH	84	dst += 2;
	85	break;
	86	}
	87	}
f332726e	88	}
d089ebaa JH	89	*dst = '\0';
	90	return 0;
	91	}
a6080a0a	92
d089ebaa JH	93	const char prefix_path(const char prefix, int len, const char *path)
	94	{
	95	const char *orig = path;
	96	char *sanitized = xmalloc(len + strlen(path) + 1);
9a13ba1b	97	if (is_absolute_path(orig))
d089ebaa JH	98	strcpy(sanitized, path);
	99	else {
	100	if (len)
	101	memcpy(sanitized, prefix, len);
	102	strcpy(sanitized + len, path);
f332726e	103	}
d089ebaa JH	104	if (sanitary_path_copy(sanitized, sanitized))
d089ebaa JH	105	goto error_out;
9a13ba1b	106	if (is_absolute_path(orig)) {
d089ebaa JH	107	const char *work_tree = get_git_work_tree();
	108	size_t len = strlen(work_tree);
	109	size_t total = strlen(sanitized) + 1;
	110	if (strncmp(sanitized, work_tree, len) \|\|
	111	(sanitized[len] != '\0' && sanitized[len] != '/')) {
	112	error_out:
62525ef7	113	die("'%s' is outside repository", orig);
d089ebaa JH	114	}
	115	if (sanitized[len] == '/')
	116	len++;
	117	memmove(sanitized, sanitized + len, total - len);
	118	}
	119	return sanitized;
f332726e LT	120	}
f332726e LT	121
a6080a0a	122	/*
4ca06608 JH	123	* Unlike prefix_path, this should be used if the named file does
	124	* not have to interact with index entry; i.e. name of a random file
	125	* on the filesystem.
	126	*/
	127	const char prefix_filename(const char pfx, int pfx_len, const char *arg)
	128	{
	129	static char path[PATH_MAX];
25fe217b	130	#ifndef __MINGW32__
ecf4831d	131	if (!pfx \|\| !*pfx \|\| is_absolute_path(arg))
4ca06608 JH	132	return arg;
	133	memcpy(path, pfx, pfx_len);
	134	strcpy(path + pfx_len, arg);
25fe217b JS	135	#else
	136	char *p;
	137	/* don't add prefix to absolute paths, but still replace '\' by '/' */
	138	if (is_absolute_path(arg))
	139	pfx_len = 0;
	140	else
	141	memcpy(path, pfx, pfx_len);
	142	strcpy(path + pfx_len, arg);
	143	for (p = path + pfx_len; *p; p++)
	144	if (*p == '\\')
	145	*p = '/';
	146	#endif
4ca06608 JH	147	return path;
	148	}
	149
e23d0b4a LT	150	/*
	151	* Verify a filename that we got as an argument for a pathspec
	152	* entry. Note that a filename that begins with "-" never verifies
	153	* as true, because even if such a filename were to exist, we want
	154	* it to be preceded by the "--" marker (or we want the user to
	155	* use a format like "./-filename")
	156	*/
	157	void verify_filename(const char prefix, const char arg)
	158	{
	159	const char *name;
	160	struct stat st;
	161
	162	if (*arg == '-')
	163	die("bad flag '%s' used after filename", arg);
	164	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	165	if (!lstat(name, &st))
	166	return;
	167	if (errno == ENOENT)
ea92f41f JH	168	die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
ea92f41f JH	169	"Use '--' to separate paths from revisions", arg);
e23d0b4a LT	170	die("'%s': %s", arg, strerror(errno));
	171	}
	172
ea92f41f JH	173	/*
	174	* Opposite of the above: the command line did not have -- marker
	175	* and we parsed the arg as a refname. It should not be interpretable
	176	* as a filename.
	177	*/
	178	void verify_non_filename(const char prefix, const char arg)
	179	{
	180	const char *name;
	181	struct stat st;
	182
7ae3df8c	183	if (!is_inside_work_tree() \|\| is_inside_git_dir())
68025633	184	return;
ea92f41f JH	185	if (*arg == '-')
	186	return; /* flag */
	187	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
	188	if (!lstat(name, &st))
	189	die("ambiguous argument '%s': both revision and filename\n"
	190	"Use '--' to separate filenames from revisions", arg);
33a798c8	191	if (errno != ENOENT && errno != ENOTDIR)
ea92f41f JH	192	die("'%s': %s", arg, strerror(errno));
	193	}
	194
6b5ee137	195	const char *get_pathspec(const char prefix, const char **pathspec)
d288a700	196	{
6b5ee137	197	const char entry = pathspec;
d089ebaa	198	const char src, dst;
d288a700 LT	199	int prefixlen;
d288a700 LT	200
f332726e LT	201	if (!prefix && !entry)
f332726e LT	202	return NULL;
d288a700 LT	203
	204	if (!entry) {
	205	static const char *spec[2];
	206	spec[0] = prefix;
	207	spec[1] = NULL;
	208	return spec;
	209	}
	210
	211	/* Otherwise we have to re-write the entries.. */
d089ebaa JH	212	src = pathspec;
d089ebaa JH	213	dst = pathspec;
f332726e	214	prefixlen = prefix ? strlen(prefix) : 0;
d089ebaa JH	215	while (*src) {
d089ebaa JH	216	const char p = prefix_path(prefix, prefixlen, src);
62525ef7	217	*(dst++) = p;
d089ebaa JH	218	src++;
	219	}
	220	*dst = NULL;
	221	if (!*pathspec)
	222	return NULL;
	223	return pathspec;
d288a700 LT	224	}
d288a700 LT	225
5f5608bc	226	/*
ad1a382f	227	* Test if it looks like we're at a git directory.
5e7bfe25	228	* We want to see:
5f5608bc	229	*
790296fd	230	* - either an objects/ directory _or_ the proper
5f5608bc	231	* GIT_OBJECT_DIRECTORY environment variable
ad1a382f	232	* - a refs/ directory
8098a178	233	* - either a HEAD symlink or a HEAD file that is formatted as
c847f537 JH	234	* a proper "ref:", or a regular file HEAD that has a properly
c847f537 JH	235	* formatted sha1 object name.
5f5608bc	236	*/
ad1a382f	237	static int is_git_directory(const char *suspect)
5f5608bc	238	{
ad1a382f SP	239	char path[PATH_MAX];
	240	size_t len = strlen(suspect);
	241
	242	strcpy(path, suspect);
	243	if (getenv(DB_ENVIRONMENT)) {
	244	if (access(getenv(DB_ENVIRONMENT), X_OK))
	245	return 0;
	246	}
	247	else {
	248	strcpy(path + len, "/objects");
	249	if (access(path, X_OK))
	250	return 0;
	251	}
	252
	253	strcpy(path + len, "/refs");
	254	if (access(path, X_OK))
8098a178	255	return 0;
ad1a382f SP	256
ad1a382f SP	257	strcpy(path + len, "/HEAD");
c847f537	258	if (validate_headref(path))
ad1a382f SP	259	return 0;
ad1a382f SP	260
8098a178	261	return 1;
5f5608bc LT	262	}
5f5608bc LT	263
68025633 JS	264	int is_inside_git_dir(void)
68025633 JS	265	{
e90fdc39 JS	266	if (inside_git_dir < 0)
	267	inside_git_dir = is_inside_dir(get_git_dir());
	268	return inside_git_dir;
892c41b9 ML	269	}
892c41b9 ML	270
892c41b9 ML	271	int is_inside_work_tree(void)
892c41b9 ML	272	{
e90fdc39 JS	273	if (inside_work_tree < 0)
	274	inside_work_tree = is_inside_dir(get_git_work_tree());
	275	return inside_work_tree;
892c41b9 ML	276	}
892c41b9 ML	277
e90fdc39	278	/*
7efeb8f0 JS	279	* set_work_tree() is only ever called if you set GIT_DIR explicitely.
	280	* The old behaviour (which we retain here) is to set the work tree root
	281	* to the cwd, unless overridden by the config, the command line, or
	282	* GIT_WORK_TREE.
e90fdc39	283	*/
7efeb8f0	284	static const char set_work_tree(const char dir)
892c41b9	285	{
7efeb8f0	286	char buffer[PATH_MAX + 1];
e90fdc39	287
7efeb8f0 JS	288	if (!getcwd(buffer, sizeof(buffer)))
	289	die ("Could not get the current working directory");
	290	git_work_tree_cfg = xstrdup(buffer);
e90fdc39 JS	291	inside_work_tree = 1;
e90fdc39 JS	292
7efeb8f0	293	return NULL;
68025633 JS	294	}
68025633 JS	295
f3fa1838 JH	296	void setup_work_tree(void)
f3fa1838 JH	297	{
354e6534 JS	298	const char work_tree, git_dir;
	299	static int initialized = 0;
	300
	301	if (initialized)
	302	return;
	303	work_tree = get_git_work_tree();
	304	git_dir = get_git_dir();
59f0f2f3	305	if (!is_absolute_path(git_dir))
044bbbcb	306	git_dir = make_absolute_path(git_dir);
59f0f2f3 MH	307	if (!work_tree \|\| chdir(work_tree))
59f0f2f3 MH	308	die("This operation must be run in a work tree");
044bbbcb	309	set_git_dir(make_relative_path(git_dir, work_tree));
354e6534	310	initialized = 1;
59f0f2f3 MH	311	}
59f0f2f3 MH	312
9459aa77 NTND	313	static int check_repository_format_gently(int *nongit_ok)
9459aa77 NTND	314	{
ef90d6d4	315	git_config(check_repository_format_version, NULL);
9459aa77 NTND	316	if (GIT_REPO_VERSION < repository_format_version) {
	317	if (!nongit_ok)
	318	die ("Expected git repo version <= %d, found %d",
	319	GIT_REPO_VERSION, repository_format_version);
	320	warning("Expected git repo version <= %d, found %d",
	321	GIT_REPO_VERSION, repository_format_version);
	322	warning("Please upgrade Git");
	323	*nongit_ok = -1;
	324	return -1;
	325	}
	326	return 0;
	327	}
	328
b44ebb19 LH	329	/*
	330	* Try to read the location of the git directory from the .git file,
	331	* return path to git directory if found.
	332	*/
	333	const char read_gitfile_gently(const char path)
	334	{
	335	char *buf;
	336	struct stat st;
	337	int fd;
	338	size_t len;
	339
	340	if (stat(path, &st))
	341	return NULL;
	342	if (!S_ISREG(st.st_mode))
	343	return NULL;
	344	fd = open(path, O_RDONLY);
	345	if (fd < 0)
	346	die("Error opening %s: %s", path, strerror(errno));
	347	buf = xmalloc(st.st_size + 1);
	348	len = read_in_full(fd, buf, st.st_size);
	349	close(fd);
	350	if (len != st.st_size)
	351	die("Error reading %s", path);
	352	buf[len] = '\0';
	353	if (prefixcmp(buf, "gitdir: "))
	354	die("Invalid gitfile format: %s", path);
	355	while (buf[len - 1] == '\n' \|\| buf[len - 1] == '\r')
	356	len--;
	357	if (len < 9)
	358	die("No path in gitfile: %s", path);
	359	buf[len] = '\0';
	360	if (!is_git_directory(buf + 8))
	361	die("Not a git repository: %s", buf + 8);
	362	path = make_absolute_path(buf + 8);
	363	free(buf);
	364	return path;
	365	}
	366
e90fdc39 JS	367	/*
	368	* We cannot decide in this function whether we are in the work tree or
	369	* not, since the config can only be read _after_ this function was called.
	370	*/
4ca06608	371	const char setup_git_directory_gently(int nongit_ok)
d288a700	372	{
e90fdc39	373	const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
0454dd93	374	const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
d288a700	375	static char cwd[PATH_MAX+1];
e90fdc39	376	const char *gitdirenv;
b44ebb19	377	const char *gitfile_dir;
0454dd93	378	int len, offset, ceil_offset;
d288a700	379
af05d679 SG	380	/*
	381	* Let's assume that we are in a git repository.
	382	* If it turns out later that we are somewhere else, the value will be
	383	* updated accordingly.
	384	*/
	385	if (nongit_ok)
	386	*nongit_ok = 0;
	387
e90fdc39 JS	388	/*
	389	* If GIT_DIR is set explicitly, we're not going
	390	* to do any discovery, but we still do repository
	391	* validation.
	392	*/
ad1a382f	393	gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e90fdc39 JS	394	if (gitdirenv) {
	395	if (PATH_MAX - 40 < strlen(gitdirenv))
	396	die("'$%s' too big", GIT_DIR_ENVIRONMENT);
	397	if (is_git_directory(gitdirenv)) {
dd5c8af1 JS	398	static char buffer[1024 + 1];
	399	const char *retval;
	400
138dd1e9 NTND	401	if (!work_tree_env) {
138dd1e9 NTND	402	retval = set_work_tree(gitdirenv);
9459aa77 NTND	403	/* config may override worktree */
	404	if (check_repository_format_gently(nongit_ok))
	405	return NULL;
138dd1e9 NTND	406	return retval;
138dd1e9 NTND	407	}
9459aa77 NTND	408	if (check_repository_format_gently(nongit_ok))
9459aa77 NTND	409	return NULL;
dd5c8af1 JS	410	retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
	411	get_git_work_tree());
	412	if (!retval \|\| !*retval)
	413	return NULL;
	414	set_git_dir(make_absolute_path(gitdirenv));
	415	if (chdir(work_tree_env) < 0)
	416	die ("Could not chdir to %s", work_tree_env);
	417	strcat(buffer, "/");
	418	return retval;
892c41b9	419	}
3a3c3fc4	420	if (nongit_ok) {
41e95f69 ML	421	*nongit_ok = 1;
	422	return NULL;
	423	}
ad1a382f	424	die("Not a git repository: '%s'", gitdirenv);
5e7bfe25	425	}
d288a700	426
f66a4d68	427	if (!getcwd(cwd, sizeof(cwd)-1))
d288a700 LT	428	die("Unable to read current working directory");
d288a700 LT	429
0454dd93	430	ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
17d778e7 JH	431	if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
17d778e7 JH	432	ceil_offset = 1;
d288a700	433
892c41b9	434	/*
e90fdc39	435	* Test in the following order (relative to the cwd):
b44ebb19	436	* - .git (file containing "gitdir: <path>")
e90fdc39 JS	437	* - .git/
e90fdc39 JS	438	* - ./ (bare)
b44ebb19	439	* - ../.git
e90fdc39 JS	440	* - ../.git/
	441	* - ../ (bare)
	442	* - ../../.git/
	443	* etc.
892c41b9	444	*/
e90fdc39 JS	445	offset = len = strlen(cwd);
e90fdc39 JS	446	for (;;) {
b44ebb19 LH	447	gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
	448	if (gitfile_dir) {
	449	if (set_git_dir(gitfile_dir))
	450	die("Repository setup failed");
	451	break;
	452	}
e90fdc39 JS	453	if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
	454	break;
	455	if (is_git_directory(".")) {
	456	inside_git_dir = 1;
	457	if (!work_tree_env)
	458	inside_work_tree = 0;
	459	setenv(GIT_DIR_ENVIRONMENT, ".", 1);
9459aa77	460	check_repository_format_gently(nongit_ok);
892c41b9 ML	461	return NULL;
892c41b9 ML	462	}
0454dd93 DR	463	while (--offset > ceil_offset && cwd[offset] != '/');
	464	if (offset <= ceil_offset) {
	465	if (nongit_ok) {
	466	if (chdir(cwd))
	467	die("Cannot come back to cwd");
	468	*nongit_ok = 1;
	469	return NULL;
e90fdc39	470	}
0454dd93 DR	471	die("Not a git repository");
0454dd93 DR	472	}
450f437f	473	chdir("..");
892c41b9 ML	474	}
892c41b9 ML	475
e90fdc39 JS	476	inside_git_dir = 0;
	477	if (!work_tree_env)
	478	inside_work_tree = 1;
	479	git_work_tree_cfg = xstrndup(cwd, offset);
9459aa77 NTND	480	if (check_repository_format_gently(nongit_ok))
9459aa77 NTND	481	return NULL;
e90fdc39	482	if (offset == len)
d288a700 LT	483	return NULL;
d288a700 LT	484
e90fdc39 JS	485	/* Make "offset" point to past the '/', and add a '/' at the end */
	486	offset++;
	487	cwd[len++] = '/';
	488	cwd[len] = 0;
	489	return cwd + offset;
d288a700	490	}
5e7bfe25	491
94df2506 JH	492	int git_config_perm(const char var, const char value)
94df2506 JH	493	{
06cbe855 HO	494	int i;
	495	char *endptr;
	496
	497	if (value == NULL)
	498	return PERM_GROUP;
	499
	500	if (!strcmp(value, "umask"))
	501	return PERM_UMASK;
	502	if (!strcmp(value, "group"))
	503	return PERM_GROUP;
	504	if (!strcmp(value, "all") \|\|
	505	!strcmp(value, "world") \|\|
	506	!strcmp(value, "everybody"))
	507	return PERM_EVERYBODY;
	508
	509	/* Parse octal numbers */
	510	i = strtol(value, &endptr, 8);
	511
	512	/* If not an octal number, maybe true/false? */
	513	if (*endptr != 0)
	514	return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
	515
	516	/*
	517	* Treat values 0, 1 and 2 as compatibility cases, otherwise it is
	518	* a chmod value.
	519	*/
	520	switch (i) {
	521	case PERM_UMASK: /* 0 */
	522	return PERM_UMASK;
	523	case OLD_PERM_GROUP: /* 1 */
	524	return PERM_GROUP;
	525	case OLD_PERM_EVERYBODY: /* 2 */
	526	return PERM_EVERYBODY;
94df2506	527	}
06cbe855 HO	528
	529	/* A filemode value was given: 0xxx */
	530
	531	if ((i & 0600) != 0600)
	532	die("Problem with core.sharedRepository filemode value "
	533	"(0%.3o).\nThe owner of files must always have "
	534	"read and write permissions.", i);
	535
	536	/*
	537	* Mask filemode value. Others can not get write permission.
	538	* x flags for directories are handled separately.
	539	*/
	540	return i & 0666;
94df2506 JH	541	}
94df2506 JH	542
ef90d6d4	543	int check_repository_format_version(const char var, const char value, void *cb)
ab9cb76f	544	{
299726d5 JS	545	if (strcmp(var, "core.repositoryformatversion") == 0)
299726d5 JS	546	repository_format_version = git_config_int(var, value);
457f06d6	547	else if (strcmp(var, "core.sharedrepository") == 0)
94df2506	548	shared_repository = git_config_perm(var, value);
e90fdc39 JS	549	else if (strcmp(var, "core.bare") == 0) {
	550	is_bare_repository_cfg = git_config_bool(var, value);
	551	if (is_bare_repository_cfg == 1)
	552	inside_work_tree = -1;
	553	} else if (strcmp(var, "core.worktree") == 0) {
180483c5 JH	554	if (!value)
180483c5 JH	555	return config_error_nonbool(var);
8e0f7003	556	free(git_work_tree_cfg);
e90fdc39 JS	557	git_work_tree_cfg = xstrdup(value);
	558	inside_work_tree = -1;
	559	}
299726d5	560	return 0;
ab9cb76f JH	561	}
	562
	563	int check_repository_format(void)
	564	{
9459aa77	565	return check_repository_format_gently(NULL);
ab9cb76f JH	566	}
ab9cb76f JH	567
5e7bfe25 JH	568	const char *setup_git_directory(void)
5e7bfe25 JH	569	{
4ca06608	570	const char *retval = setup_git_directory_gently(NULL);
e90fdc39 JS	571
	572	/* If the work tree is not the default one, recompute prefix */
	573	if (inside_work_tree < 0) {
	574	static char buffer[PATH_MAX + 1];
	575	char *rel;
	576	if (retval && chdir(retval))
	577	die ("Could not jump back into original cwd");
	578	rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
bb528633 NTND	579	if (rel && *rel && chdir(get_git_work_tree()))
bb528633 NTND	580	die ("Could not jump to working directory");
e90fdc39 JS	581	return rel && *rel ? strcat(rel, "/") : NULL;
	582	}
	583
5e7bfe25 JH	584	return retval;
5e7bfe25 JH	585	}