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(int *nongit_ok)
248 git_config(check_repository_format_version, NULL);
249 if (GIT_REPO_VERSION < repository_format_version) {
251 die ("Expected git repo version <= %d, found %d",
252 GIT_REPO_VERSION, repository_format_version);
253 warning("Expected git repo version <= %d, found %d",
254 GIT_REPO_VERSION, repository_format_version);
255 warning("Please upgrade Git");
263 * Try to read the location of the git directory from the .git file,
264 * return path to git directory if found.
266 const char *read_gitfile_gently(const char *path)
277 if (!S_ISREG(st.st_mode))
279 fd = open(path, O_RDONLY);
281 die_errno("Error opening '%s'", path);
282 buf = xmalloc(st.st_size + 1);
283 len = read_in_full(fd, buf, st.st_size);
285 if (len != st.st_size)
286 die("Error reading %s", path);
288 if (prefixcmp(buf, "gitdir: "))
289 die("Invalid gitfile format: %s", path);
290 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
293 die("No path in gitfile: %s", path);
297 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
298 size_t pathlen = slash+1 - path;
299 size_t dirlen = pathlen + len - 8;
300 dir = xmalloc(dirlen + 1);
301 strncpy(dir, path, pathlen);
302 strncpy(dir + pathlen, buf + 8, len - 8);
308 if (!is_git_directory(dir))
309 die("Not a git repository: %s", dir);
310 path = make_absolute_path(dir);
317 * We cannot decide in this function whether we are in the work tree or
318 * not, since the config can only be read _after_ this function was called.
320 const char *setup_git_directory_gently(int *nongit_ok)
322 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
323 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
324 static char cwd[PATH_MAX+1];
325 const char *gitdirenv;
326 const char *gitfile_dir;
327 int len, offset, ceil_offset, root_len;
328 dev_t current_device = 0;
329 int one_filesystem = 1;
333 * Let's assume that we are in a git repository.
334 * If it turns out later that we are somewhere else, the value will be
335 * updated accordingly.
341 * If GIT_DIR is set explicitly, we're not going
342 * to do any discovery, but we still do repository
345 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
347 if (PATH_MAX - 40 < strlen(gitdirenv))
348 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
349 if (is_git_directory(gitdirenv)) {
350 static char buffer[1024 + 1];
353 if (!work_tree_env) {
354 retval = set_work_tree(gitdirenv);
355 /* config may override worktree */
356 if (check_repository_format_gently(nongit_ok))
360 if (check_repository_format_gently(nongit_ok))
362 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
363 get_git_work_tree());
364 if (!retval || !*retval)
366 set_git_dir(make_absolute_path(gitdirenv));
367 if (chdir(work_tree_env) < 0)
368 die_errno ("Could not chdir to '%s'", work_tree_env);
376 die("Not a git repository: '%s'", gitdirenv);
379 if (!getcwd(cwd, sizeof(cwd)-1))
380 die_errno("Unable to read current working directory");
382 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
383 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
387 * Test in the following order (relative to the cwd):
388 * - .git (file containing "gitdir: <path>")
397 offset = len = strlen(cwd);
398 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
399 if (one_filesystem) {
401 die_errno("failed to stat '.'");
402 current_device = buf.st_dev;
405 gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
407 if (set_git_dir(gitfile_dir))
408 die("Repository setup failed");
411 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
413 if (is_git_directory(".")) {
416 inside_work_tree = 0;
418 root_len = offset_1st_component(cwd);
419 cwd[offset > root_len ? offset : root_len] = '\0';
423 check_repository_format_gently(nongit_ok);
426 while (--offset > ceil_offset && cwd[offset] != '/');
427 if (offset <= ceil_offset) {
430 die_errno("Cannot come back to cwd");
434 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
436 if (one_filesystem) {
437 if (stat("..", &buf)) {
439 die_errno("failed to stat '%s/..'", cwd);
441 if (buf.st_dev != current_device) {
444 die_errno("Cannot come back to cwd");
449 die("Not a git repository (or any parent up to mount parent %s)\n"
450 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
455 die_errno("Cannot change to '%s/..'", cwd);
461 inside_work_tree = 1;
462 root_len = offset_1st_component(cwd);
463 git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
464 if (check_repository_format_gently(nongit_ok))
469 /* Make "offset" point to past the '/', and add a '/' at the end */
476 int git_config_perm(const char *var, const char *value)
484 if (!strcmp(value, "umask"))
486 if (!strcmp(value, "group"))
488 if (!strcmp(value, "all") ||
489 !strcmp(value, "world") ||
490 !strcmp(value, "everybody"))
491 return PERM_EVERYBODY;
493 /* Parse octal numbers */
494 i = strtol(value, &endptr, 8);
496 /* If not an octal number, maybe true/false? */
498 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
501 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
502 * a chmod value to restrict to.
505 case PERM_UMASK: /* 0 */
507 case OLD_PERM_GROUP: /* 1 */
509 case OLD_PERM_EVERYBODY: /* 2 */
510 return PERM_EVERYBODY;
513 /* A filemode value was given: 0xxx */
515 if ((i & 0600) != 0600)
516 die("Problem with core.sharedRepository filemode value "
517 "(0%.3o).\nThe owner of files must always have "
518 "read and write permissions.", i);
521 * Mask filemode value. Others can not get write permission.
522 * x flags for directories are handled separately.
527 int check_repository_format_version(const char *var, const char *value, void *cb)
529 if (strcmp(var, "core.repositoryformatversion") == 0)
530 repository_format_version = git_config_int(var, value);
531 else if (strcmp(var, "core.sharedrepository") == 0)
532 shared_repository = git_config_perm(var, value);
533 else if (strcmp(var, "core.bare") == 0) {
534 is_bare_repository_cfg = git_config_bool(var, value);
535 if (is_bare_repository_cfg == 1)
536 inside_work_tree = -1;
537 } else if (strcmp(var, "core.worktree") == 0) {
539 return config_error_nonbool(var);
540 free(git_work_tree_cfg);
541 git_work_tree_cfg = xstrdup(value);
542 inside_work_tree = -1;
547 int check_repository_format(void)
549 return check_repository_format_gently(NULL);
553 * Returns the "prefix", a path to the current working directory
554 * relative to the work tree root, or NULL, if the current working
555 * directory is not a strict subdirectory of the work tree root. The
556 * prefix always ends with a '/' character.
558 const char *setup_git_directory(void)
560 const char *retval = setup_git_directory_gently(NULL);
562 /* If the work tree is not the default one, recompute prefix */
563 if (inside_work_tree < 0) {
564 static char buffer[PATH_MAX + 1];
566 if (retval && chdir(retval))
567 die_errno ("Could not jump back into original cwd");
568 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
569 if (rel && *rel && chdir(get_git_work_tree()))
570 die_errno ("Could not jump to working directory");
571 return rel && *rel ? strcat(rel, "/") : NULL;