4 static int inside_git_dir = -1;
5 static int inside_work_tree = -1;
7 const char *prefix_path(const char *prefix, int len, const char *path)
9 const char *orig = path;
10 char *sanitized = xmalloc(len + strlen(path) + 1);
11 if (is_absolute_path(orig))
12 strcpy(sanitized, path);
15 memcpy(sanitized, prefix, len);
16 strcpy(sanitized + len, path);
18 if (normalize_path_copy(sanitized, sanitized))
20 if (is_absolute_path(orig)) {
21 size_t root_len, len, total;
22 const char *work_tree = get_git_work_tree();
25 len = strlen(work_tree);
26 root_len = offset_1st_component(work_tree);
27 total = strlen(sanitized) + 1;
28 if (strncmp(sanitized, work_tree, len) ||
29 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
31 die("'%s' is outside repository", orig);
33 if (sanitized[len] == '/')
35 memmove(sanitized, sanitized + len, total - len);
41 * Unlike prefix_path, this should be used if the named file does
42 * not have to interact with index entry; i.e. name of a random file
45 const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
47 static char path[PATH_MAX];
49 if (!pfx || !*pfx || is_absolute_path(arg))
51 memcpy(path, pfx, pfx_len);
52 strcpy(path + pfx_len, arg);
55 /* don't add prefix to absolute paths, but still replace '\' by '/' */
56 if (is_absolute_path(arg))
59 memcpy(path, pfx, pfx_len);
60 strcpy(path + pfx_len, arg);
61 for (p = path + pfx_len; *p; p++)
68 int check_filename(const char *prefix, const char *arg)
73 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
74 if (!lstat(name, &st))
75 return 1; /* file exists */
76 if (errno == ENOENT || errno == ENOTDIR)
77 return 0; /* file does not exist */
78 die_errno("failed to stat '%s'", arg);
81 static void NORETURN die_verify_filename(const char *prefix, const char *arg)
83 unsigned char sha1[20];
85 /* try a detailed diagnostic ... */
86 get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
87 /* ... or fall back the most general message. */
88 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
89 "Use '--' to separate paths from revisions", arg);
94 * Verify a filename that we got as an argument for a pathspec
95 * entry. Note that a filename that begins with "-" never verifies
96 * as true, because even if such a filename were to exist, we want
97 * it to be preceded by the "--" marker (or we want the user to
98 * use a format like "./-filename")
100 void verify_filename(const char *prefix, const char *arg)
103 die("bad flag '%s' used after filename", arg);
104 if (check_filename(prefix, arg))
106 die_verify_filename(prefix, arg);
110 * Opposite of the above: the command line did not have -- marker
111 * and we parsed the arg as a refname. It should not be interpretable
114 void verify_non_filename(const char *prefix, const char *arg)
116 if (!is_inside_work_tree() || is_inside_git_dir())
120 if (!check_filename(prefix, arg))
122 die("ambiguous argument '%s': both revision and filename\n"
123 "Use '--' to separate filenames from revisions", arg);
126 const char **get_pathspec(const char *prefix, const char **pathspec)
128 const char *entry = *pathspec;
129 const char **src, **dst;
132 if (!prefix && !entry)
136 static const char *spec[2];
142 /* Otherwise we have to re-write the entries.. */
145 prefixlen = prefix ? strlen(prefix) : 0;
147 const char *p = prefix_path(prefix, prefixlen, *src);
158 * Test if it looks like we're at a git directory.
161 * - either an objects/ directory _or_ the proper
162 * GIT_OBJECT_DIRECTORY environment variable
163 * - a refs/ directory
164 * - either a HEAD symlink or a HEAD file that is formatted as
165 * a proper "ref:", or a regular file HEAD that has a properly
166 * formatted sha1 object name.
168 static int is_git_directory(const char *suspect)
171 size_t len = strlen(suspect);
173 if (PATH_MAX <= len + strlen("/objects"))
174 die("Too long path: %.*s", 60, suspect);
175 strcpy(path, suspect);
176 if (getenv(DB_ENVIRONMENT)) {
177 if (access(getenv(DB_ENVIRONMENT), X_OK))
181 strcpy(path + len, "/objects");
182 if (access(path, X_OK))
186 strcpy(path + len, "/refs");
187 if (access(path, X_OK))
190 strcpy(path + len, "/HEAD");
191 if (validate_headref(path))
197 int is_inside_git_dir(void)
199 if (inside_git_dir < 0)
200 inside_git_dir = is_inside_dir(get_git_dir());
201 return inside_git_dir;
204 int is_inside_work_tree(void)
206 if (inside_work_tree < 0)
207 inside_work_tree = is_inside_dir(get_git_work_tree());
208 return inside_work_tree;
212 * set_work_tree() is only ever called if you set GIT_DIR explicitly.
213 * The old behaviour (which we retain here) is to set the work tree root
214 * to the cwd, unless overridden by the config, the command line, or
217 static const char *set_work_tree(const char *dir)
219 char buffer[PATH_MAX + 1];
221 if (!getcwd(buffer, sizeof(buffer)))
222 die ("Could not get the current working directory");
223 git_work_tree_cfg = xstrdup(buffer);
224 inside_work_tree = 1;
229 void setup_work_tree(void)
231 const char *work_tree, *git_dir;
232 static int initialized = 0;
236 work_tree = get_git_work_tree();
237 git_dir = get_git_dir();
238 if (!is_absolute_path(git_dir))
239 git_dir = make_absolute_path(git_dir);
240 if (!work_tree || chdir(work_tree))
241 die("This operation must be run in a work tree");
242 set_git_dir(make_relative_path(git_dir, work_tree));
246 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
248 char repo_config[PATH_MAX+1];
251 * git_config() can't be used here because it calls git_pathdup()
252 * to get $GIT_CONFIG/config. That call will make setup_git_env()
253 * set git_dir to ".git".
255 * We are in gitdir setup, no git dir has been found useable yet.
256 * Use a gentler version of git_config() to check if this repo
259 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
260 git_config_early(check_repository_format_version, NULL, repo_config);
261 if (GIT_REPO_VERSION < repository_format_version) {
263 die ("Expected git repo version <= %d, found %d",
264 GIT_REPO_VERSION, repository_format_version);
265 warning("Expected git repo version <= %d, found %d",
266 GIT_REPO_VERSION, repository_format_version);
267 warning("Please upgrade Git");
275 * Try to read the location of the git directory from the .git file,
276 * return path to git directory if found.
278 const char *read_gitfile_gently(const char *path)
289 if (!S_ISREG(st.st_mode))
291 fd = open(path, O_RDONLY);
293 die_errno("Error opening '%s'", path);
294 buf = xmalloc(st.st_size + 1);
295 len = read_in_full(fd, buf, st.st_size);
297 if (len != st.st_size)
298 die("Error reading %s", path);
300 if (prefixcmp(buf, "gitdir: "))
301 die("Invalid gitfile format: %s", path);
302 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
305 die("No path in gitfile: %s", path);
309 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
310 size_t pathlen = slash+1 - path;
311 size_t dirlen = pathlen + len - 8;
312 dir = xmalloc(dirlen + 1);
313 strncpy(dir, path, pathlen);
314 strncpy(dir + pathlen, buf + 8, len - 8);
320 if (!is_git_directory(dir))
321 die("Not a git repository: %s", dir);
322 path = make_absolute_path(dir);
328 static const char *setup_explicit_git_dir(const char *gitdirenv,
329 const char *work_tree_env, int *nongit_ok)
331 static char buffer[1024 + 1];
335 startup_info->setup_explicit = 1;
336 if (PATH_MAX - 40 < strlen(gitdirenv))
337 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
338 if (!is_git_directory(gitdirenv)) {
343 die("Not a git repository: '%s'", gitdirenv);
345 if (!work_tree_env) {
346 retval = set_work_tree(gitdirenv);
347 /* config may override worktree */
348 if (check_repository_format_gently(gitdirenv, nongit_ok))
352 if (check_repository_format_gently(gitdirenv, nongit_ok))
354 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
355 get_git_work_tree());
356 if (!retval || !*retval)
358 set_git_dir(make_absolute_path(gitdirenv));
359 if (chdir(work_tree_env) < 0)
360 die_errno ("Could not chdir to '%s'", work_tree_env);
365 static int cwd_contains_git_dir(const char **gitfile_dirp)
367 const char *gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
368 *gitfile_dirp = gitfile_dir;
370 if (set_git_dir(gitfile_dir))
371 die("Repository setup failed");
374 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) {
375 *gitfile_dirp = DEFAULT_GIT_DIR_ENVIRONMENT;
381 static const char *setup_discovered_git_dir(const char *work_tree_env,
384 char *cwd, int *nongit_ok)
391 inside_work_tree = 1;
392 root_len = offset_1st_component(cwd);
393 work_tree = xstrndup(cwd, offset > root_len ? offset : root_len);
394 set_git_work_tree(work_tree);
396 if (check_repository_format_gently(gitdir, nongit_ok))
401 /* Make "offset" point to past the '/', and add a '/' at the end */
408 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
409 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
413 if (check_repository_format_gently(".", nongit_ok))
417 inside_work_tree = 0;
420 die_errno("Cannot come back to cwd");
421 root_len = offset_1st_component(cwd);
422 cwd[offset > root_len ? offset : root_len] = '\0';
430 static const char *setup_nongit(const char *cwd, int *nongit_ok)
433 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
435 die_errno("Cannot come back to cwd");
440 static dev_t get_device_or_die(const char *path, const char *prefix)
443 if (stat(path, &buf))
444 die_errno("failed to stat '%s%s%s'",
445 prefix ? prefix : "",
446 prefix ? "/" : "", path);
451 * We cannot decide in this function whether we are in the work tree or
452 * not, since the config can only be read _after_ this function was called.
454 static const char *setup_git_directory_gently_1(int *nongit_ok)
456 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
457 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
458 static char cwd[PATH_MAX+1];
459 const char *gitdirenv;
460 const char *gitfile_dir;
461 int len, offset, ceil_offset;
462 dev_t current_device = 0;
463 int one_filesystem = 1;
466 * Let's assume that we are in a git repository.
467 * If it turns out later that we are somewhere else, the value will be
468 * updated accordingly.
474 * If GIT_DIR is set explicitly, we're not going
475 * to do any discovery, but we still do repository
478 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
480 return setup_explicit_git_dir(gitdirenv, work_tree_env, nongit_ok);
482 if (!getcwd(cwd, sizeof(cwd)-1))
483 die_errno("Unable to read current working directory");
485 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
486 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
490 * Test in the following order (relative to the cwd):
491 * - .git (file containing "gitdir: <path>")
500 offset = len = strlen(cwd);
501 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
503 current_device = get_device_or_die(".", NULL);
505 if (cwd_contains_git_dir(&gitfile_dir))
506 return setup_discovered_git_dir(work_tree_env,
510 if (is_git_directory("."))
511 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
513 while (--offset > ceil_offset && cwd[offset] != '/');
514 if (offset <= ceil_offset)
515 return setup_nongit(cwd, nongit_ok);
516 if (one_filesystem) {
517 dev_t parent_device = get_device_or_die("..", cwd);
518 if (parent_device != current_device) {
521 die_errno("Cannot come back to cwd");
526 die("Not a git repository (or any parent up to mount parent %s)\n"
527 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
532 die_errno("Cannot change to '%s/..'", cwd);
537 const char *setup_git_directory_gently(int *nongit_ok)
541 prefix = setup_git_directory_gently_1(nongit_ok);
543 startup_info->have_repository = !nongit_ok || !*nongit_ok;
547 int git_config_perm(const char *var, const char *value)
555 if (!strcmp(value, "umask"))
557 if (!strcmp(value, "group"))
559 if (!strcmp(value, "all") ||
560 !strcmp(value, "world") ||
561 !strcmp(value, "everybody"))
562 return PERM_EVERYBODY;
564 /* Parse octal numbers */
565 i = strtol(value, &endptr, 8);
567 /* If not an octal number, maybe true/false? */
569 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
572 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
573 * a chmod value to restrict to.
576 case PERM_UMASK: /* 0 */
578 case OLD_PERM_GROUP: /* 1 */
580 case OLD_PERM_EVERYBODY: /* 2 */
581 return PERM_EVERYBODY;
584 /* A filemode value was given: 0xxx */
586 if ((i & 0600) != 0600)
587 die("Problem with core.sharedRepository filemode value "
588 "(0%.3o).\nThe owner of files must always have "
589 "read and write permissions.", i);
592 * Mask filemode value. Others can not get write permission.
593 * x flags for directories are handled separately.
598 int check_repository_format_version(const char *var, const char *value, void *cb)
600 if (strcmp(var, "core.repositoryformatversion") == 0)
601 repository_format_version = git_config_int(var, value);
602 else if (strcmp(var, "core.sharedrepository") == 0)
603 shared_repository = git_config_perm(var, value);
604 else if (strcmp(var, "core.bare") == 0) {
605 is_bare_repository_cfg = git_config_bool(var, value);
606 if (is_bare_repository_cfg == 1)
607 inside_work_tree = -1;
608 } else if (strcmp(var, "core.worktree") == 0) {
610 return config_error_nonbool(var);
611 free(git_work_tree_cfg);
612 git_work_tree_cfg = xstrdup(value);
613 inside_work_tree = -1;
618 int check_repository_format(void)
620 return check_repository_format_gently(get_git_dir(), NULL);
624 * Returns the "prefix", a path to the current working directory
625 * relative to the work tree root, or NULL, if the current working
626 * directory is not a strict subdirectory of the work tree root. The
627 * prefix always ends with a '/' character.
629 const char *setup_git_directory(void)
631 const char *retval = setup_git_directory_gently(NULL);
633 /* If the work tree is not the default one, recompute prefix */
634 if ((!startup_info || startup_info->setup_explicit) &&
635 inside_work_tree < 0) {
636 static char buffer[PATH_MAX + 1];
638 if (retval && chdir(retval))
639 die_errno ("Could not jump back into original cwd");
640 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
641 if (rel && *rel && chdir(get_git_work_tree()))
642 die_errno ("Could not jump to working directory");
643 return rel && *rel ? strcat(rel, "/") : NULL;