2 * Utilities for paths and pathnames
5 #include "repository.h"
7 #include "string-list.h"
10 #include "submodule-config.h"
13 static int get_st_mode_bits(const char *path, int *mode)
16 if (lstat(path, &st) < 0)
22 static char bad_path[] = "/bad-path/";
24 static struct strbuf *get_pathname(void)
26 static struct strbuf pathname_array[4] = {
27 STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
30 struct strbuf *sb = &pathname_array[index];
31 index = (index + 1) % ARRAY_SIZE(pathname_array);
36 static char *cleanup_path(char *path)
39 if (!memcmp(path, "./", 2)) {
47 static void strbuf_cleanup_path(struct strbuf *sb)
49 char *path = cleanup_path(sb->buf);
51 strbuf_remove(sb, 0, path - sb->buf);
54 char *mksnpath(char *buf, size_t n, const char *fmt, ...)
60 len = vsnprintf(buf, n, fmt, args);
63 strlcpy(buf, bad_path, n);
66 return cleanup_path(buf);
69 static int dir_prefix(const char *buf, const char *dir)
71 int len = strlen(dir);
72 return !strncmp(buf, dir, len) &&
73 (is_dir_sep(buf[len]) || buf[len] == '\0');
76 /* $buf =~ m|$dir/+$file| but without regex */
77 static int is_dir_file(const char *buf, const char *dir, const char *file)
79 int len = strlen(dir);
80 if (strncmp(buf, dir, len) || !is_dir_sep(buf[len]))
82 while (is_dir_sep(buf[len]))
84 return !strcmp(buf + len, file);
87 static void replace_dir(struct strbuf *buf, int len, const char *newdir)
89 int newlen = strlen(newdir);
90 int need_sep = (buf->buf[len] && !is_dir_sep(buf->buf[len])) &&
91 !is_dir_sep(newdir[newlen - 1]);
93 len--; /* keep one char, to be replaced with '/' */
94 strbuf_splice(buf, 0, len, newdir, newlen);
96 buf->buf[newlen] = '/';
100 /* Not considered garbage for report_linked_checkout_garbage */
101 unsigned ignore_garbage:1;
103 /* Not common even though its parent is */
108 static struct common_dir common_list[] = {
109 { 0, 1, 0, "branches" },
110 { 0, 1, 0, "hooks" },
112 { 0, 0, 1, "info/sparse-checkout" },
114 { 1, 1, 1, "logs/HEAD" },
115 { 0, 1, 1, "logs/refs/bisect" },
116 { 0, 1, 0, "lost-found" },
117 { 0, 1, 0, "objects" },
119 { 0, 1, 1, "refs/bisect" },
120 { 0, 1, 0, "remotes" },
121 { 0, 1, 0, "worktrees" },
122 { 0, 1, 0, "rr-cache" },
124 { 0, 0, 0, "config" },
125 { 1, 0, 0, "gc.pid" },
126 { 0, 0, 0, "packed-refs" },
127 { 0, 0, 0, "shallow" },
132 * A compressed trie. A trie node consists of zero or more characters that
133 * are common to all elements with this prefix, optionally followed by some
134 * children. If value is not NULL, the trie node is a terminal node.
136 * For example, consider the following set of strings:
142 * The trie would look like:
143 * root: len = 0, children a and d non-NULL, value = NULL.
144 * a: len = 2, contents = bc, value = (data for "abc")
145 * d: len = 2, contents = ef, children i non-NULL, value = (data for "def")
146 * i: len = 3, contents = nit, children e and i non-NULL, value = NULL
147 * e: len = 0, children all NULL, value = (data for "definite")
148 * i: len = 2, contents = on, children all NULL,
149 * value = (data for "definition")
152 struct trie *children[256];
158 static struct trie *make_trie_node(const char *key, void *value)
160 struct trie *new_node = xcalloc(1, sizeof(*new_node));
161 new_node->len = strlen(key);
163 new_node->contents = xmalloc(new_node->len);
164 memcpy(new_node->contents, key, new_node->len);
166 new_node->value = value;
171 * Add a key/value pair to a trie. The key is assumed to be \0-terminated.
172 * If there was an existing value for this key, return it.
174 static void *add_to_trie(struct trie *root, const char *key, void *value)
181 /* we have reached the end of the key */
187 for (i = 0; i < root->len; i++) {
188 if (root->contents[i] == key[i])
192 * Split this node: child will contain this node's
195 child = malloc(sizeof(*child));
196 memcpy(child->children, root->children, sizeof(root->children));
198 child->len = root->len - i - 1;
200 child->contents = xstrndup(root->contents + i + 1,
203 child->value = root->value;
207 memset(root->children, 0, sizeof(root->children));
208 root->children[(unsigned char)root->contents[i]] = child;
210 /* This is the newly-added child. */
211 root->children[(unsigned char)key[i]] =
212 make_trie_node(key + i + 1, value);
216 /* We have matched the entire compressed section */
218 child = root->children[(unsigned char)key[root->len]];
220 return add_to_trie(child, key + root->len + 1, value);
222 child = make_trie_node(key + root->len + 1, value);
223 root->children[(unsigned char)key[root->len]] = child;
233 typedef int (*match_fn)(const char *unmatched, void *data, void *baton);
236 * Search a trie for some key. Find the longest /-or-\0-terminated
237 * prefix of the key for which the trie contains a value. Call fn
238 * with the unmatched portion of the key and the found value, and
239 * return its return value. If there is no such prefix, return -1.
241 * The key is partially normalized: consecutive slashes are skipped.
243 * For example, consider the trie containing only [refs,
244 * refs/worktree] (both with values).
246 * | key | unmatched | val from node | return value |
247 * |-----------------|------------|---------------|--------------|
248 * | a | not called | n/a | -1 |
249 * | refs | \0 | refs | as per fn |
250 * | refs/ | / | refs | as per fn |
251 * | refs/w | /w | refs | as per fn |
252 * | refs/worktree | \0 | refs/worktree | as per fn |
253 * | refs/worktree/ | / | refs/worktree | as per fn |
254 * | refs/worktree/a | /a | refs/worktree | as per fn |
255 * |-----------------|------------|---------------|--------------|
258 static int trie_find(struct trie *root, const char *key, match_fn fn,
266 /* we have reached the end of the key */
267 if (root->value && !root->len)
268 return fn(key, root->value, baton);
273 for (i = 0; i < root->len; i++) {
274 /* Partial path normalization: skip consecutive slashes. */
275 if (key[i] == '/' && key[i+1] == '/') {
279 if (root->contents[i] != key[i])
283 /* Matched the entire compressed section */
287 return fn(key, root->value, baton);
289 /* Partial path normalization: skip consecutive slashes */
290 while (key[0] == '/' && key[1] == '/')
293 child = root->children[(unsigned char)*key];
295 result = trie_find(child, key + 1, fn, baton);
299 if (result >= 0 || (*key != '/' && *key != 0))
302 return fn(key, root->value, baton);
307 static struct trie common_trie;
308 static int common_trie_done_setup;
310 static void init_common_trie(void)
312 struct common_dir *p;
314 if (common_trie_done_setup)
317 for (p = common_list; p->dirname; p++)
318 add_to_trie(&common_trie, p->dirname, p);
320 common_trie_done_setup = 1;
324 * Helper function for update_common_dir: returns 1 if the dir
327 static int check_common(const char *unmatched, void *value, void *baton)
329 struct common_dir *dir = value;
334 if (dir->is_dir && (unmatched[0] == 0 || unmatched[0] == '/'))
335 return !dir->exclude;
337 if (!dir->is_dir && unmatched[0] == 0)
338 return !dir->exclude;
343 static void update_common_dir(struct strbuf *buf, int git_dir_len,
344 const char *common_dir)
346 char *base = buf->buf + git_dir_len;
348 if (trie_find(&common_trie, base, check_common, NULL) > 0)
349 replace_dir(buf, git_dir_len, common_dir);
352 void report_linked_checkout_garbage(void)
354 struct strbuf sb = STRBUF_INIT;
355 const struct common_dir *p;
358 if (!the_repository->different_commondir)
360 strbuf_addf(&sb, "%s/", get_git_dir());
362 for (p = common_list; p->dirname; p++) {
363 const char *path = p->dirname;
364 if (p->ignore_garbage)
366 strbuf_setlen(&sb, len);
367 strbuf_addstr(&sb, path);
368 if (file_exists(sb.buf))
369 report_garbage(PACKDIR_FILE_GARBAGE, sb.buf);
374 static void adjust_git_path(const struct repository *repo,
375 struct strbuf *buf, int git_dir_len)
377 const char *base = buf->buf + git_dir_len;
378 if (is_dir_file(base, "info", "grafts"))
379 strbuf_splice(buf, 0, buf->len,
380 repo->graft_file, strlen(repo->graft_file));
381 else if (!strcmp(base, "index"))
382 strbuf_splice(buf, 0, buf->len,
383 repo->index_file, strlen(repo->index_file));
384 else if (dir_prefix(base, "objects"))
385 replace_dir(buf, git_dir_len + 7, repo->objectdir);
386 else if (git_hooks_path && dir_prefix(base, "hooks"))
387 replace_dir(buf, git_dir_len + 5, git_hooks_path);
388 else if (repo->different_commondir)
389 update_common_dir(buf, git_dir_len, repo->commondir);
392 static void strbuf_worktree_gitdir(struct strbuf *buf,
393 const struct repository *repo,
394 const struct worktree *wt)
397 strbuf_addstr(buf, repo->gitdir);
399 strbuf_addstr(buf, repo->commondir);
401 strbuf_git_common_path(buf, repo, "worktrees/%s", wt->id);
404 static void do_git_path(const struct repository *repo,
405 const struct worktree *wt, struct strbuf *buf,
406 const char *fmt, va_list args)
409 strbuf_worktree_gitdir(buf, repo, wt);
410 if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
411 strbuf_addch(buf, '/');
412 gitdir_len = buf->len;
413 strbuf_vaddf(buf, fmt, args);
414 adjust_git_path(repo, buf, gitdir_len);
415 strbuf_cleanup_path(buf);
418 char *git_path_buf(struct strbuf *buf, const char *fmt, ...)
423 do_git_path(the_repository, NULL, buf, fmt, args);
428 void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
432 do_git_path(the_repository, NULL, sb, fmt, args);
436 const char *git_path(const char *fmt, ...)
438 struct strbuf *pathname = get_pathname();
441 do_git_path(the_repository, NULL, pathname, fmt, args);
443 return pathname->buf;
446 char *git_pathdup(const char *fmt, ...)
448 struct strbuf path = STRBUF_INIT;
451 do_git_path(the_repository, NULL, &path, fmt, args);
453 return strbuf_detach(&path, NULL);
456 char *mkpathdup(const char *fmt, ...)
458 struct strbuf sb = STRBUF_INIT;
461 strbuf_vaddf(&sb, fmt, args);
463 strbuf_cleanup_path(&sb);
464 return strbuf_detach(&sb, NULL);
467 const char *mkpath(const char *fmt, ...)
470 struct strbuf *pathname = get_pathname();
472 strbuf_vaddf(pathname, fmt, args);
474 return cleanup_path(pathname->buf);
477 const char *worktree_git_path(const struct worktree *wt, const char *fmt, ...)
479 struct strbuf *pathname = get_pathname();
482 do_git_path(the_repository, wt, pathname, fmt, args);
484 return pathname->buf;
487 /* Returns 0 on success, negative on failure. */
488 static int do_submodule_path(struct strbuf *buf, const char *path,
489 const char *fmt, va_list args)
491 struct strbuf git_submodule_common_dir = STRBUF_INIT;
492 struct strbuf git_submodule_dir = STRBUF_INIT;
495 ret = submodule_to_gitdir(&git_submodule_dir, path);
499 strbuf_complete(&git_submodule_dir, '/');
500 strbuf_addbuf(buf, &git_submodule_dir);
501 strbuf_vaddf(buf, fmt, args);
503 if (get_common_dir_noenv(&git_submodule_common_dir, git_submodule_dir.buf))
504 update_common_dir(buf, git_submodule_dir.len, git_submodule_common_dir.buf);
506 strbuf_cleanup_path(buf);
509 strbuf_release(&git_submodule_dir);
510 strbuf_release(&git_submodule_common_dir);
514 char *git_pathdup_submodule(const char *path, const char *fmt, ...)
518 struct strbuf buf = STRBUF_INIT;
520 err = do_submodule_path(&buf, path, fmt, args);
523 strbuf_release(&buf);
526 return strbuf_detach(&buf, NULL);
529 int strbuf_git_path_submodule(struct strbuf *buf, const char *path,
530 const char *fmt, ...)
535 err = do_submodule_path(buf, path, fmt, args);
541 static void do_git_common_path(const struct repository *repo,
546 strbuf_addstr(buf, repo->commondir);
547 if (buf->len && !is_dir_sep(buf->buf[buf->len - 1]))
548 strbuf_addch(buf, '/');
549 strbuf_vaddf(buf, fmt, args);
550 strbuf_cleanup_path(buf);
553 const char *git_common_path(const char *fmt, ...)
555 struct strbuf *pathname = get_pathname();
558 do_git_common_path(the_repository, pathname, fmt, args);
560 return pathname->buf;
563 void strbuf_git_common_path(struct strbuf *sb,
564 const struct repository *repo,
565 const char *fmt, ...)
569 do_git_common_path(repo, sb, fmt, args);
573 int validate_headref(const char *path)
576 char *buf, buffer[256];
577 unsigned char sha1[20];
581 if (lstat(path, &st) < 0)
584 /* Make sure it is a "refs/.." symlink */
585 if (S_ISLNK(st.st_mode)) {
586 len = readlink(path, buffer, sizeof(buffer)-1);
587 if (len >= 5 && !memcmp("refs/", buffer, 5))
593 * Anything else, just open it and try to see if it is a symbolic ref.
595 fd = open(path, O_RDONLY);
598 len = read_in_full(fd, buffer, sizeof(buffer)-1);
602 * Is it a symbolic ref?
606 if (!memcmp("ref:", buffer, 4)) {
609 while (len && isspace(*buf))
611 if (len >= 5 && !memcmp("refs/", buf, 5))
616 * Is this a detached HEAD?
618 if (!get_sha1_hex(buffer, sha1))
624 static struct passwd *getpw_str(const char *username, size_t len)
627 char *username_z = xmemdupz(username, len);
628 pw = getpwnam(username_z);
634 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
635 * then it is a newly allocated string. Returns NULL on getpw failure or
638 * If real_home is true, real_path($HOME) is used in the expansion.
640 char *expand_user_path(const char *path, int real_home)
642 struct strbuf user_path = STRBUF_INIT;
643 const char *to_copy = path;
647 if (path[0] == '~') {
648 const char *first_slash = strchrnul(path, '/');
649 const char *username = path + 1;
650 size_t username_len = first_slash - username;
651 if (username_len == 0) {
652 const char *home = getenv("HOME");
656 strbuf_addstr(&user_path, real_path(home));
658 strbuf_addstr(&user_path, home);
659 #ifdef GIT_WINDOWS_NATIVE
660 convert_slashes(user_path.buf);
663 struct passwd *pw = getpw_str(username, username_len);
666 strbuf_addstr(&user_path, pw->pw_dir);
668 to_copy = first_slash;
670 strbuf_addstr(&user_path, to_copy);
671 return strbuf_detach(&user_path, NULL);
673 strbuf_release(&user_path);
678 * First, one directory to try is determined by the following algorithm.
680 * (0) If "strict" is given, the path is used as given and no DWIM is
682 * (1) "~/path" to mean path under the running user's home directory;
683 * (2) "~user/path" to mean path under named user's home directory;
684 * (3) "relative/path" to mean cwd relative directory; or
685 * (4) "/absolute/path" to mean absolute directory.
687 * Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git"
688 * in this order. We select the first one that is a valid git repository, and
689 * chdir() to it. If none match, or we fail to chdir, we return NULL.
691 * If all goes well, we return the directory we used to chdir() (but
692 * before ~user is expanded), avoiding getcwd() resolving symbolic
693 * links. User relative paths are also returned as they are given,
694 * except DWIM suffixing.
696 const char *enter_repo(const char *path, int strict)
698 static struct strbuf validated_path = STRBUF_INIT;
699 static struct strbuf used_path = STRBUF_INIT;
705 static const char *suffix[] = {
706 "/.git", "", ".git/.git", ".git", NULL,
709 int len = strlen(path);
711 while ((1 < len) && (path[len-1] == '/'))
715 * We can handle arbitrary-sized buffers, but this remains as a
716 * sanity check on untrusted input.
721 strbuf_reset(&used_path);
722 strbuf_reset(&validated_path);
723 strbuf_add(&used_path, path, len);
724 strbuf_add(&validated_path, path, len);
726 if (used_path.buf[0] == '~') {
727 char *newpath = expand_user_path(used_path.buf, 0);
730 strbuf_attach(&used_path, newpath, strlen(newpath),
733 for (i = 0; suffix[i]; i++) {
735 size_t baselen = used_path.len;
736 strbuf_addstr(&used_path, suffix[i]);
737 if (!stat(used_path.buf, &st) &&
738 (S_ISREG(st.st_mode) ||
739 (S_ISDIR(st.st_mode) && is_git_directory(used_path.buf)))) {
740 strbuf_addstr(&validated_path, suffix[i]);
743 strbuf_setlen(&used_path, baselen);
747 gitfile = read_gitfile(used_path.buf);
749 strbuf_reset(&used_path);
750 strbuf_addstr(&used_path, gitfile);
752 if (chdir(used_path.buf))
754 path = validated_path.buf;
757 const char *gitfile = read_gitfile(path);
764 if (is_git_directory(".")) {
766 check_repository_format();
773 static int calc_shared_perm(int mode)
777 if (get_shared_repository() < 0)
778 tweak = -get_shared_repository();
780 tweak = get_shared_repository();
782 if (!(mode & S_IWUSR))
785 /* Copy read bits to execute bits */
786 tweak |= (tweak & 0444) >> 2;
787 if (get_shared_repository() < 0)
788 mode = (mode & ~0777) | tweak;
796 int adjust_shared_perm(const char *path)
798 int old_mode, new_mode;
800 if (!get_shared_repository())
802 if (get_st_mode_bits(path, &old_mode) < 0)
805 new_mode = calc_shared_perm(old_mode);
806 if (S_ISDIR(old_mode)) {
807 /* Copy read bits to execute bits */
808 new_mode |= (new_mode & 0444) >> 2;
809 new_mode |= FORCE_DIR_SET_GID;
812 if (((old_mode ^ new_mode) & ~S_IFMT) &&
813 chmod(path, (new_mode & ~S_IFMT)) < 0)
818 void safe_create_dir(const char *dir, int share)
820 if (mkdir(dir, 0777) < 0) {
821 if (errno != EEXIST) {
826 else if (share && adjust_shared_perm(dir))
827 die(_("Could not make %s writable by group"), dir);
830 static int have_same_root(const char *path1, const char *path2)
832 int is_abs1, is_abs2;
834 is_abs1 = is_absolute_path(path1);
835 is_abs2 = is_absolute_path(path2);
836 return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) ||
837 (!is_abs1 && !is_abs2);
841 * Give path as relative to prefix.
843 * The strbuf may or may not be used, so do not assume it contains the
846 const char *relative_path(const char *in, const char *prefix,
849 int in_len = in ? strlen(in) : 0;
850 int prefix_len = prefix ? strlen(prefix) : 0;
857 else if (!prefix_len)
860 if (have_same_root(in, prefix))
861 /* bypass dos_drive, for "c:" is identical to "C:" */
862 i = j = has_dos_drive_prefix(in);
867 while (i < prefix_len && j < in_len && prefix[i] == in[j]) {
868 if (is_dir_sep(prefix[i])) {
869 while (is_dir_sep(prefix[i]))
871 while (is_dir_sep(in[j]))
882 /* "prefix" seems like prefix of "in" */
885 * but "/foo" is not a prefix of "/foobar"
886 * (i.e. prefix not end with '/')
888 prefix_off < prefix_len) {
890 /* in="/a/b", prefix="/a/b" */
892 } else if (is_dir_sep(in[j])) {
893 /* in="/a/b/c", prefix="/a/b" */
894 while (is_dir_sep(in[j]))
898 /* in="/a/bbb/c", prefix="/a/b" */
902 /* "in" is short than "prefix" */
904 /* "in" not end with '/' */
906 if (is_dir_sep(prefix[i])) {
907 /* in="/a/b", prefix="/a/b/c/" */
908 while (is_dir_sep(prefix[i]))
916 if (i >= prefix_len) {
924 strbuf_grow(sb, in_len);
926 while (i < prefix_len) {
927 if (is_dir_sep(prefix[i])) {
928 strbuf_addstr(sb, "../");
929 while (is_dir_sep(prefix[i]))
935 if (!is_dir_sep(prefix[prefix_len - 1]))
936 strbuf_addstr(sb, "../");
938 strbuf_addstr(sb, in);
944 * A simpler implementation of relative_path
946 * Get relative path by removing "prefix" from "in". This function
947 * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
948 * to increase performance when traversing the path to work_tree.
950 const char *remove_leading_path(const char *in, const char *prefix)
952 static struct strbuf buf = STRBUF_INIT;
955 if (!prefix || !prefix[0])
958 if (is_dir_sep(prefix[i])) {
959 if (!is_dir_sep(in[j]))
961 while (is_dir_sep(prefix[i]))
963 while (is_dir_sep(in[j]))
966 } else if (in[j] != prefix[i]) {
973 /* "/foo" is a prefix of "/foo" */
975 /* "/foo" is not a prefix of "/foobar" */
976 !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j])
979 while (is_dir_sep(in[j]))
984 strbuf_addstr(&buf, ".");
986 strbuf_addstr(&buf, in + j);
991 * It is okay if dst == src, but they should not overlap otherwise.
993 * Performs the following normalizations on src, storing the result in dst:
994 * - Ensures that components are separated by '/' (Windows only)
995 * - Squashes sequences of '/' except "//server/share" on Windows
996 * - Removes "." components.
997 * - Removes ".." components, and the components the precede them.
998 * Returns failure (non-zero) if a ".." component appears as first path
999 * component anytime during the normalization. Otherwise, returns success (0).
1001 * Note that this function is purely textual. It does not follow symlinks,
1002 * verify the existence of the path, or make any system calls.
1004 * prefix_len != NULL is for a specific case of prefix_pathspec():
1005 * assume that src == dst and src[0..prefix_len-1] is already
1006 * normalized, any time "../" eats up to the prefix_len part,
1007 * prefix_len is reduced. In the end prefix_len is the remaining
1008 * prefix that has not been overridden by user pathspec.
1010 * NEEDSWORK: This function doesn't perform normalization w.r.t. trailing '/'.
1011 * For everything but the root folder itself, the normalized path should not
1012 * end with a '/', then the callers need to be fixed up accordingly.
1015 int normalize_path_copy_len(char *dst, const char *src, int *prefix_len)
1021 * Copy initial part of absolute path: "/", "C:/", "//server/share/".
1023 end = src + offset_1st_component(src);
1032 while (is_dir_sep(*src))
1039 * A path component that begins with . could be
1041 * (1) "." and ends -- ignore and terminate.
1042 * (2) "./" -- ignore them, eat slash and continue.
1043 * (3) ".." and ends -- strip one and terminate.
1044 * (4) "../" -- strip one, eat slash and continue.
1050 } else if (is_dir_sep(src[1])) {
1053 while (is_dir_sep(*src))
1056 } else if (src[1] == '.') {
1061 } else if (is_dir_sep(src[2])) {
1064 while (is_dir_sep(*src))
1071 /* copy up to the next '/', and eat all '/' */
1072 while ((c = *src++) != '\0' && !is_dir_sep(c))
1074 if (is_dir_sep(c)) {
1076 while (is_dir_sep(c))
1085 * dst0..dst is prefix portion, and dst[-1] is '/';
1088 dst--; /* go to trailing '/' */
1091 /* Windows: dst[-1] cannot be backslash anymore */
1092 while (dst0 < dst && dst[-1] != '/')
1094 if (prefix_len && *prefix_len > dst - dst0)
1095 *prefix_len = dst - dst0;
1101 int normalize_path_copy(char *dst, const char *src)
1103 return normalize_path_copy_len(dst, src, NULL);
1107 * path = Canonical absolute path
1108 * prefixes = string_list containing normalized, absolute paths without
1109 * trailing slashes (except for the root directory, which is denoted by "/").
1111 * Determines, for each path in prefixes, whether the "prefix"
1112 * is an ancestor directory of path. Returns the length of the longest
1113 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
1114 * is an ancestor. (Note that this means 0 is returned if prefixes is
1115 * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
1116 * are not considered to be their own ancestors. path must be in a
1117 * canonical form: empty components, or "." or ".." components are not
1120 int longest_ancestor_length(const char *path, struct string_list *prefixes)
1122 int i, max_len = -1;
1124 if (!strcmp(path, "/"))
1127 for (i = 0; i < prefixes->nr; i++) {
1128 const char *ceil = prefixes->items[i].string;
1129 int len = strlen(ceil);
1131 if (len == 1 && ceil[0] == '/')
1132 len = 0; /* root matches anything, with length 0 */
1133 else if (!strncmp(path, ceil, len) && path[len] == '/')
1134 ; /* match of length len */
1136 continue; /* no match */
1145 /* strip arbitrary amount of directory separators at end of path */
1146 static inline int chomp_trailing_dir_sep(const char *path, int len)
1148 while (len && is_dir_sep(path[len - 1]))
1154 * If path ends with suffix (complete path components), returns the
1155 * part before suffix (sans trailing directory separators).
1156 * Otherwise returns NULL.
1158 char *strip_path_suffix(const char *path, const char *suffix)
1160 int path_len = strlen(path), suffix_len = strlen(suffix);
1162 while (suffix_len) {
1166 if (is_dir_sep(path[path_len - 1])) {
1167 if (!is_dir_sep(suffix[suffix_len - 1]))
1169 path_len = chomp_trailing_dir_sep(path, path_len);
1170 suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
1172 else if (path[--path_len] != suffix[--suffix_len])
1176 if (path_len && !is_dir_sep(path[path_len - 1]))
1178 return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
1181 int daemon_avoid_alias(const char *p)
1186 * This resurrects the belts and suspenders paranoia check by HPA
1187 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
1188 * does not do getcwd() based path canonicalization.
1190 * sl becomes true immediately after seeing '/' and continues to
1191 * be true as long as dots continue after that without intervening
1192 * non-dot character.
1194 if (!p || (*p != '/' && *p != '~'))
1204 else if (ch == '/') {
1206 /* reject //, /./ and /../ */
1211 if (0 < ndot && ndot < 3)
1212 /* reject /.$ and /..$ */
1221 else if (ch == '/') {
1228 static int only_spaces_and_periods(const char *path, size_t len, size_t skip)
1236 if (c != ' ' && c != '.')
1242 int is_ntfs_dotgit(const char *name)
1246 for (len = 0; ; len++)
1247 if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) {
1248 if (only_spaces_and_periods(name, len, 4) &&
1249 !strncasecmp(name, ".git", 4))
1251 if (only_spaces_and_periods(name, len, 5) &&
1252 !strncasecmp(name, "git~1", 5))
1254 if (name[len] != '\\')
1261 char *xdg_config_home(const char *filename)
1263 const char *home, *config_home;
1266 config_home = getenv("XDG_CONFIG_HOME");
1267 if (config_home && *config_home)
1268 return mkpathdup("%s/git/%s", config_home, filename);
1270 home = getenv("HOME");
1272 return mkpathdup("%s/.config/git/%s", home, filename);
1276 char *xdg_cache_home(const char *filename)
1278 const char *home, *cache_home;
1281 cache_home = getenv("XDG_CACHE_HOME");
1282 if (cache_home && *cache_home)
1283 return mkpathdup("%s/git/%s", cache_home, filename);
1285 home = getenv("HOME");
1287 return mkpathdup("%s/.cache/git/%s", home, filename);
1291 GIT_PATH_FUNC(git_path_cherry_pick_head, "CHERRY_PICK_HEAD")
1292 GIT_PATH_FUNC(git_path_revert_head, "REVERT_HEAD")
1293 GIT_PATH_FUNC(git_path_squash_msg, "SQUASH_MSG")
1294 GIT_PATH_FUNC(git_path_merge_msg, "MERGE_MSG")
1295 GIT_PATH_FUNC(git_path_merge_rr, "MERGE_RR")
1296 GIT_PATH_FUNC(git_path_merge_mode, "MERGE_MODE")
1297 GIT_PATH_FUNC(git_path_merge_head, "MERGE_HEAD")
1298 GIT_PATH_FUNC(git_path_fetch_head, "FETCH_HEAD")
1299 GIT_PATH_FUNC(git_path_shallow, "shallow")