2 * I'm tired of doing "vsnprintf()" etc just to open a
3 * file, so here's a "return static buffer with printf"
6 * It's obviously not thread-safe. Sue me. But it's quite
7 * useful for doing things like
9 * f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
11 * which is what it's designed for.
16 static char bad_path[] = "/bad-path/";
18 static char *get_pathname(void)
20 static char pathname_array[4][PATH_MAX];
22 return pathname_array[3 & ++index];
25 static char *cleanup_path(char *path)
28 if (!memcmp(path, "./", 2)) {
36 char *mksnpath(char *buf, size_t n, const char *fmt, ...)
42 len = vsnprintf(buf, n, fmt, args);
45 strlcpy(buf, bad_path, n);
48 return cleanup_path(buf);
51 static char *vsnpath(char *buf, size_t n, const char *fmt, va_list args)
53 const char *git_dir = get_git_dir();
56 len = strlen(git_dir);
59 memcpy(buf, git_dir, len);
60 if (len && !is_dir_sep(git_dir[len-1]))
62 len += vsnprintf(buf + len, n - len, fmt, args);
65 return cleanup_path(buf);
67 strlcpy(buf, bad_path, n);
71 char *git_snpath(char *buf, size_t n, const char *fmt, ...)
76 ret = vsnpath(buf, n, fmt, args);
81 char *git_pathdup(const char *fmt, ...)
83 char path[PATH_MAX], *ret;
86 ret = vsnpath(path, sizeof(path), fmt, args);
91 char *mkpathdup(const char *fmt, ...)
94 struct strbuf sb = STRBUF_INIT;
98 strbuf_vaddf(&sb, fmt, args);
100 path = xstrdup(cleanup_path(sb.buf));
106 char *mkpath(const char *fmt, ...)
110 char *pathname = get_pathname();
113 len = vsnprintf(pathname, PATH_MAX, fmt, args);
117 return cleanup_path(pathname);
120 char *git_path(const char *fmt, ...)
122 const char *git_dir = get_git_dir();
123 char *pathname = get_pathname();
127 len = strlen(git_dir);
128 if (len > PATH_MAX-100)
130 memcpy(pathname, git_dir, len);
131 if (len && git_dir[len-1] != '/')
132 pathname[len++] = '/';
134 len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
138 return cleanup_path(pathname);
141 void home_config_paths(char **global, char **xdg, char *file)
143 char *xdg_home = getenv("XDG_CONFIG_HOME");
144 char *home = getenv("HOME");
145 char *to_free = NULL;
152 to_free = mkpathdup("%s/.config", home);
156 *global = mkpathdup("%s/.gitconfig", home);
162 *xdg = mkpathdup("%s/git/%s", xdg_home, file);
167 char *git_path_submodule(const char *path, const char *fmt, ...)
169 char *pathname = get_pathname();
170 struct strbuf buf = STRBUF_INIT;
176 if (len > PATH_MAX-100)
179 strbuf_addstr(&buf, path);
180 if (len && path[len-1] != '/')
181 strbuf_addch(&buf, '/');
182 strbuf_addstr(&buf, ".git");
184 git_dir = read_gitfile(buf.buf);
187 strbuf_addstr(&buf, git_dir);
189 strbuf_addch(&buf, '/');
191 if (buf.len >= PATH_MAX)
193 memcpy(pathname, buf.buf, buf.len + 1);
195 strbuf_release(&buf);
196 len = strlen(pathname);
199 len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
203 return cleanup_path(pathname);
206 int validate_headref(const char *path)
209 char *buf, buffer[256];
210 unsigned char sha1[20];
214 if (lstat(path, &st) < 0)
217 /* Make sure it is a "refs/.." symlink */
218 if (S_ISLNK(st.st_mode)) {
219 len = readlink(path, buffer, sizeof(buffer)-1);
220 if (len >= 5 && !memcmp("refs/", buffer, 5))
226 * Anything else, just open it and try to see if it is a symbolic ref.
228 fd = open(path, O_RDONLY);
231 len = read_in_full(fd, buffer, sizeof(buffer)-1);
235 * Is it a symbolic ref?
239 if (!memcmp("ref:", buffer, 4)) {
242 while (len && isspace(*buf))
244 if (len >= 5 && !memcmp("refs/", buf, 5))
249 * Is this a detached HEAD?
251 if (!get_sha1_hex(buffer, sha1))
257 static struct passwd *getpw_str(const char *username, size_t len)
260 char *username_z = xmalloc(len + 1);
261 memcpy(username_z, username, len);
262 username_z[len] = '\0';
263 pw = getpwnam(username_z);
269 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
270 * then it is a newly allocated string. Returns NULL on getpw failure or
273 char *expand_user_path(const char *path)
275 struct strbuf user_path = STRBUF_INIT;
276 const char *first_slash = strchrnul(path, '/');
277 const char *to_copy = path;
281 if (path[0] == '~') {
282 const char *username = path + 1;
283 size_t username_len = first_slash - username;
284 if (username_len == 0) {
285 const char *home = getenv("HOME");
288 strbuf_add(&user_path, home, strlen(home));
290 struct passwd *pw = getpw_str(username, username_len);
293 strbuf_add(&user_path, pw->pw_dir, strlen(pw->pw_dir));
295 to_copy = first_slash;
297 strbuf_add(&user_path, to_copy, strlen(to_copy));
298 return strbuf_detach(&user_path, NULL);
300 strbuf_release(&user_path);
305 * First, one directory to try is determined by the following algorithm.
307 * (0) If "strict" is given, the path is used as given and no DWIM is
309 * (1) "~/path" to mean path under the running user's home directory;
310 * (2) "~user/path" to mean path under named user's home directory;
311 * (3) "relative/path" to mean cwd relative directory; or
312 * (4) "/absolute/path" to mean absolute directory.
314 * Unless "strict" is given, we try access() for existence of "%s.git/.git",
315 * "%s/.git", "%s.git", "%s" in this order. The first one that exists is
318 * Second, we try chdir() to that. Upon failure, we return NULL.
320 * Then, we try if the current directory is a valid git repository.
321 * Upon failure, we return NULL.
323 * If all goes well, we return the directory we used to chdir() (but
324 * before ~user is expanded), avoiding getcwd() resolving symbolic
325 * links. User relative paths are also returned as they are given,
326 * except DWIM suffixing.
328 const char *enter_repo(const char *path, int strict)
330 static char used_path[PATH_MAX];
331 static char validated_path[PATH_MAX];
337 static const char *suffix[] = {
338 "/.git", "", ".git/.git", ".git", NULL,
341 int len = strlen(path);
343 while ((1 < len) && (path[len-1] == '/'))
348 strncpy(used_path, path, len); used_path[len] = 0 ;
349 strcpy(validated_path, used_path);
351 if (used_path[0] == '~') {
352 char *newpath = expand_user_path(used_path);
353 if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
358 * Copy back into the static buffer. A pity
359 * since newpath was not bounded, but other
360 * branches of the if are limited by PATH_MAX
363 strcpy(used_path, newpath); free(newpath);
365 else if (PATH_MAX - 10 < len)
367 len = strlen(used_path);
368 for (i = 0; suffix[i]; i++) {
370 strcpy(used_path + len, suffix[i]);
371 if (!stat(used_path, &st) &&
372 (S_ISREG(st.st_mode) ||
373 (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) {
374 strcat(validated_path, suffix[i]);
380 gitfile = read_gitfile(used_path) ;
382 strcpy(used_path, gitfile);
383 if (chdir(used_path))
385 path = validated_path;
387 else if (chdir(path))
390 if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
391 validate_headref("HEAD") == 0) {
393 check_repository_format();
400 int set_shared_perm(const char *path, int mode)
403 int tweak, shared, orig_mode;
405 if (!shared_repository) {
407 return chmod(path, mode & ~S_IFMT);
411 if (lstat(path, &st) < 0)
417 if (shared_repository < 0)
418 shared = -shared_repository;
420 shared = shared_repository;
423 if (!(mode & S_IWUSR))
426 /* Copy read bits to execute bits */
427 tweak |= (tweak & 0444) >> 2;
428 if (shared_repository < 0)
429 mode = (mode & ~0777) | tweak;
434 /* Copy read bits to execute bits */
435 mode |= (shared & 0444) >> 2;
436 mode |= FORCE_DIR_SET_GID;
439 if (((shared_repository < 0
440 ? (orig_mode & (FORCE_DIR_SET_GID | 0777))
441 : (orig_mode & mode)) != mode) &&
442 chmod(path, (mode & ~S_IFMT)) < 0)
447 const char *relative_path(const char *abs, const char *base)
449 static char buf[PATH_MAX + 1];
452 if (!base || !base[0])
455 if (is_dir_sep(base[i])) {
456 if (!is_dir_sep(abs[j]))
458 while (is_dir_sep(base[i]))
460 while (is_dir_sep(abs[j]))
463 } else if (abs[j] != base[i]) {
470 /* "/foo" is a prefix of "/foo" */
472 /* "/foo" is not a prefix of "/foobar" */
473 !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j])
476 while (is_dir_sep(abs[j]))
481 strcpy(buf, abs + j);
486 * It is okay if dst == src, but they should not overlap otherwise.
488 * Performs the following normalizations on src, storing the result in dst:
489 * - Ensures that components are separated by '/' (Windows only)
490 * - Squashes sequences of '/'.
491 * - Removes "." components.
492 * - Removes ".." components, and the components the precede them.
493 * Returns failure (non-zero) if a ".." component appears as first path
494 * component anytime during the normalization. Otherwise, returns success (0).
496 * Note that this function is purely textual. It does not follow symlinks,
497 * verify the existence of the path, or make any system calls.
499 int normalize_path_copy(char *dst, const char *src)
503 if (has_dos_drive_prefix(src)) {
509 if (is_dir_sep(*src)) {
511 while (is_dir_sep(*src))
519 * A path component that begins with . could be
521 * (1) "." and ends -- ignore and terminate.
522 * (2) "./" -- ignore them, eat slash and continue.
523 * (3) ".." and ends -- strip one and terminate.
524 * (4) "../" -- strip one, eat slash and continue.
530 } else if (is_dir_sep(src[1])) {
533 while (is_dir_sep(*src))
536 } else if (src[1] == '.') {
541 } else if (is_dir_sep(src[2])) {
544 while (is_dir_sep(*src))
551 /* copy up to the next '/', and eat all '/' */
552 while ((c = *src++) != '\0' && !is_dir_sep(c))
556 while (is_dir_sep(c))
565 * dst0..dst is prefix portion, and dst[-1] is '/';
568 dst--; /* go to trailing '/' */
571 /* Windows: dst[-1] cannot be backslash anymore */
572 while (dst0 < dst && dst[-1] != '/')
580 * path = Canonical absolute path
581 * prefix_list = Colon-separated list of absolute paths
583 * Determines, for each path in prefix_list, whether the "prefix" really
584 * is an ancestor directory of path. Returns the length of the longest
585 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
586 * is an ancestor. (Note that this means 0 is returned if prefix_list is
587 * "/".) "/foo" is not considered an ancestor of "/foobar". Directories
588 * are not considered to be their own ancestors. path must be in a
589 * canonical form: empty components, or "." or ".." components are not
590 * allowed. prefix_list may be null, which is like "".
592 int longest_ancestor_length(const char *path, const char *prefix_list)
594 char buf[PATH_MAX+1];
595 const char *ceil, *colon;
596 int len, max_len = -1;
598 if (prefix_list == NULL || !strcmp(path, "/"))
601 for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
602 for (colon = ceil; *colon && *colon != PATH_SEP; colon++);
604 if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
606 strlcpy(buf, ceil, len+1);
607 if (normalize_path_copy(buf, buf) < 0)
610 if (len > 0 && buf[len-1] == '/')
613 if (!strncmp(path, buf, len) &&
623 /* strip arbitrary amount of directory separators at end of path */
624 static inline int chomp_trailing_dir_sep(const char *path, int len)
626 while (len && is_dir_sep(path[len - 1]))
632 * If path ends with suffix (complete path components), returns the
633 * part before suffix (sans trailing directory separators).
634 * Otherwise returns NULL.
636 char *strip_path_suffix(const char *path, const char *suffix)
638 int path_len = strlen(path), suffix_len = strlen(suffix);
644 if (is_dir_sep(path[path_len - 1])) {
645 if (!is_dir_sep(suffix[suffix_len - 1]))
647 path_len = chomp_trailing_dir_sep(path, path_len);
648 suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
650 else if (path[--path_len] != suffix[--suffix_len])
654 if (path_len && !is_dir_sep(path[path_len - 1]))
656 return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
659 int daemon_avoid_alias(const char *p)
664 * This resurrects the belts and suspenders paranoia check by HPA
665 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
666 * does not do getcwd() based path canonicalization.
668 * sl becomes true immediately after seeing '/' and continues to
669 * be true as long as dots continue after that without intervening
672 if (!p || (*p != '/' && *p != '~'))
682 else if (ch == '/') {
684 /* reject //, /./ and /../ */
689 if (0 < ndot && ndot < 3)
690 /* reject /.$ and /..$ */
699 else if (ch == '/') {
706 int offset_1st_component(const char *path)
708 if (has_dos_drive_prefix(path))
709 return 2 + is_dir_sep(path[2]);
710 return is_dir_sep(path[0]);