2 * Utilities for paths and pathnames
6 #include "string-list.h"
9 static int get_st_mode_bits(const char *path
, int *mode
)
12 if (lstat(path
, &st
) < 0)
18 static char bad_path
[] = "/bad-path/";
20 static struct strbuf
*get_pathname(void)
22 static struct strbuf pathname_array
[4] = {
23 STRBUF_INIT
, STRBUF_INIT
, STRBUF_INIT
, STRBUF_INIT
26 struct strbuf
*sb
= &pathname_array
[3 & ++index
];
31 static char *cleanup_path(char *path
)
34 if (!memcmp(path
, "./", 2)) {
42 static void strbuf_cleanup_path(struct strbuf
*sb
)
44 char *path
= cleanup_path(sb
->buf
);
46 strbuf_remove(sb
, 0, path
- sb
->buf
);
49 char *mksnpath(char *buf
, size_t n
, const char *fmt
, ...)
55 len
= vsnprintf(buf
, n
, fmt
, args
);
58 strlcpy(buf
, bad_path
, n
);
61 return cleanup_path(buf
);
64 static int dir_prefix(const char *buf
, const char *dir
)
66 int len
= strlen(dir
);
67 return !strncmp(buf
, dir
, len
) &&
68 (is_dir_sep(buf
[len
]) || buf
[len
] == '\0');
71 /* $buf =~ m|$dir/+$file| but without regex */
72 static int is_dir_file(const char *buf
, const char *dir
, const char *file
)
74 int len
= strlen(dir
);
75 if (strncmp(buf
, dir
, len
) || !is_dir_sep(buf
[len
]))
77 while (is_dir_sep(buf
[len
]))
79 return !strcmp(buf
+ len
, file
);
82 static void replace_dir(struct strbuf
*buf
, int len
, const char *newdir
)
84 int newlen
= strlen(newdir
);
85 int need_sep
= (buf
->buf
[len
] && !is_dir_sep(buf
->buf
[len
])) &&
86 !is_dir_sep(newdir
[newlen
- 1]);
88 len
--; /* keep one char, to be replaced with '/' */
89 strbuf_splice(buf
, 0, len
, newdir
, newlen
);
91 buf
->buf
[newlen
] = '/';
95 /* Not considered garbage for report_linked_checkout_garbage */
96 unsigned ignore_garbage
:1;
98 /* Not common even though its parent is */
103 static struct common_dir common_list
[] = {
104 { 0, 1, 0, "branches" },
105 { 0, 1, 0, "hooks" },
107 { 0, 0, 1, "info/sparse-checkout" },
109 { 1, 1, 1, "logs/HEAD" },
110 { 0, 1, 1, "logs/refs/bisect" },
111 { 0, 1, 0, "lost-found" },
112 { 0, 1, 0, "objects" },
114 { 0, 1, 1, "refs/bisect" },
115 { 0, 1, 0, "remotes" },
116 { 0, 1, 0, "worktrees" },
117 { 0, 1, 0, "rr-cache" },
119 { 0, 0, 0, "config" },
120 { 1, 0, 0, "gc.pid" },
121 { 0, 0, 0, "packed-refs" },
122 { 0, 0, 0, "shallow" },
127 * A compressed trie. A trie node consists of zero or more characters that
128 * are common to all elements with this prefix, optionally followed by some
129 * children. If value is not NULL, the trie node is a terminal node.
131 * For example, consider the following set of strings:
137 * The trie would look like:
138 * root: len = 0, children a and d non-NULL, value = NULL.
139 * a: len = 2, contents = bc, value = (data for "abc")
140 * d: len = 2, contents = ef, children i non-NULL, value = (data for "def")
141 * i: len = 3, contents = nit, children e and i non-NULL, value = NULL
142 * e: len = 0, children all NULL, value = (data for "definite")
143 * i: len = 2, contents = on, children all NULL,
144 * value = (data for "definition")
147 struct trie
*children
[256];
153 static struct trie
*make_trie_node(const char *key
, void *value
)
155 struct trie
*new_node
= xcalloc(1, sizeof(*new_node
));
156 new_node
->len
= strlen(key
);
158 new_node
->contents
= xmalloc(new_node
->len
);
159 memcpy(new_node
->contents
, key
, new_node
->len
);
161 new_node
->value
= value
;
166 * Add a key/value pair to a trie. The key is assumed to be \0-terminated.
167 * If there was an existing value for this key, return it.
169 static void *add_to_trie(struct trie
*root
, const char *key
, void *value
)
176 /* we have reached the end of the key */
182 for (i
= 0; i
< root
->len
; i
++) {
183 if (root
->contents
[i
] == key
[i
])
187 * Split this node: child will contain this node's
190 child
= malloc(sizeof(*child
));
191 memcpy(child
->children
, root
->children
, sizeof(root
->children
));
193 child
->len
= root
->len
- i
- 1;
195 child
->contents
= xstrndup(root
->contents
+ i
+ 1,
198 child
->value
= root
->value
;
202 memset(root
->children
, 0, sizeof(root
->children
));
203 root
->children
[(unsigned char)root
->contents
[i
]] = child
;
205 /* This is the newly-added child. */
206 root
->children
[(unsigned char)key
[i
]] =
207 make_trie_node(key
+ i
+ 1, value
);
211 /* We have matched the entire compressed section */
213 child
= root
->children
[(unsigned char)key
[root
->len
]];
215 return add_to_trie(child
, key
+ root
->len
+ 1, value
);
217 child
= make_trie_node(key
+ root
->len
+ 1, value
);
218 root
->children
[(unsigned char)key
[root
->len
]] = child
;
228 typedef int (*match_fn
)(const char *unmatched
, void *data
, void *baton
);
231 * Search a trie for some key. Find the longest /-or-\0-terminated
232 * prefix of the key for which the trie contains a value. Call fn
233 * with the unmatched portion of the key and the found value, and
234 * return its return value. If there is no such prefix, return -1.
236 * The key is partially normalized: consecutive slashes are skipped.
238 * For example, consider the trie containing only [refs,
239 * refs/worktree] (both with values).
241 * | key | unmatched | val from node | return value |
242 * |-----------------|------------|---------------|--------------|
243 * | a | not called | n/a | -1 |
244 * | refs | \0 | refs | as per fn |
245 * | refs/ | / | refs | as per fn |
246 * | refs/w | /w | refs | as per fn |
247 * | refs/worktree | \0 | refs/worktree | as per fn |
248 * | refs/worktree/ | / | refs/worktree | as per fn |
249 * | refs/worktree/a | /a | refs/worktree | as per fn |
250 * |-----------------|------------|---------------|--------------|
253 static int trie_find(struct trie
*root
, const char *key
, match_fn fn
,
261 /* we have reached the end of the key */
262 if (root
->value
&& !root
->len
)
263 return fn(key
, root
->value
, baton
);
268 for (i
= 0; i
< root
->len
; i
++) {
269 /* Partial path normalization: skip consecutive slashes. */
270 if (key
[i
] == '/' && key
[i
+1] == '/') {
274 if (root
->contents
[i
] != key
[i
])
278 /* Matched the entire compressed section */
282 return fn(key
, root
->value
, baton
);
284 /* Partial path normalization: skip consecutive slashes */
285 while (key
[0] == '/' && key
[1] == '/')
288 child
= root
->children
[(unsigned char)*key
];
290 result
= trie_find(child
, key
+ 1, fn
, baton
);
294 if (result
>= 0 || (*key
!= '/' && *key
!= 0))
297 return fn(key
, root
->value
, baton
);
302 static struct trie common_trie
;
303 static int common_trie_done_setup
;
305 static void init_common_trie(void)
307 struct common_dir
*p
;
309 if (common_trie_done_setup
)
312 for (p
= common_list
; p
->dirname
; p
++)
313 add_to_trie(&common_trie
, p
->dirname
, p
);
315 common_trie_done_setup
= 1;
319 * Helper function for update_common_dir: returns 1 if the dir
322 static int check_common(const char *unmatched
, void *value
, void *baton
)
324 struct common_dir
*dir
= value
;
329 if (dir
->is_dir
&& (unmatched
[0] == 0 || unmatched
[0] == '/'))
330 return !dir
->exclude
;
332 if (!dir
->is_dir
&& unmatched
[0] == 0)
333 return !dir
->exclude
;
338 static void update_common_dir(struct strbuf
*buf
, int git_dir_len
,
339 const char *common_dir
)
341 char *base
= buf
->buf
+ git_dir_len
;
344 common_dir
= get_git_common_dir();
345 if (trie_find(&common_trie
, base
, check_common
, NULL
) > 0)
346 replace_dir(buf
, git_dir_len
, common_dir
);
349 void report_linked_checkout_garbage(void)
351 struct strbuf sb
= STRBUF_INIT
;
352 const struct common_dir
*p
;
355 if (!git_common_dir_env
)
357 strbuf_addf(&sb
, "%s/", get_git_dir());
359 for (p
= common_list
; p
->dirname
; p
++) {
360 const char *path
= p
->dirname
;
361 if (p
->ignore_garbage
)
363 strbuf_setlen(&sb
, len
);
364 strbuf_addstr(&sb
, path
);
365 if (file_exists(sb
.buf
))
366 report_garbage(PACKDIR_FILE_GARBAGE
, sb
.buf
);
371 static void adjust_git_path(struct strbuf
*buf
, int git_dir_len
)
373 const char *base
= buf
->buf
+ git_dir_len
;
374 if (git_graft_env
&& is_dir_file(base
, "info", "grafts"))
375 strbuf_splice(buf
, 0, buf
->len
,
376 get_graft_file(), strlen(get_graft_file()));
377 else if (git_index_env
&& !strcmp(base
, "index"))
378 strbuf_splice(buf
, 0, buf
->len
,
379 get_index_file(), strlen(get_index_file()));
380 else if (git_db_env
&& dir_prefix(base
, "objects"))
381 replace_dir(buf
, git_dir_len
+ 7, get_object_directory());
382 else if (git_common_dir_env
)
383 update_common_dir(buf
, git_dir_len
, NULL
);
386 static void do_git_path(struct strbuf
*buf
, const char *fmt
, va_list args
)
389 strbuf_addstr(buf
, get_git_dir());
390 if (buf
->len
&& !is_dir_sep(buf
->buf
[buf
->len
- 1]))
391 strbuf_addch(buf
, '/');
392 gitdir_len
= buf
->len
;
393 strbuf_vaddf(buf
, fmt
, args
);
394 adjust_git_path(buf
, gitdir_len
);
395 strbuf_cleanup_path(buf
);
398 char *git_path_buf(struct strbuf
*buf
, const char *fmt
, ...)
403 do_git_path(buf
, fmt
, args
);
408 void strbuf_git_path(struct strbuf
*sb
, const char *fmt
, ...)
412 do_git_path(sb
, fmt
, args
);
416 const char *git_path(const char *fmt
, ...)
418 struct strbuf
*pathname
= get_pathname();
421 do_git_path(pathname
, fmt
, args
);
423 return pathname
->buf
;
426 char *git_pathdup(const char *fmt
, ...)
428 struct strbuf path
= STRBUF_INIT
;
431 do_git_path(&path
, fmt
, args
);
433 return strbuf_detach(&path
, NULL
);
436 char *mkpathdup(const char *fmt
, ...)
438 struct strbuf sb
= STRBUF_INIT
;
441 strbuf_vaddf(&sb
, fmt
, args
);
443 strbuf_cleanup_path(&sb
);
444 return strbuf_detach(&sb
, NULL
);
447 const char *mkpath(const char *fmt
, ...)
450 struct strbuf
*pathname
= get_pathname();
452 strbuf_vaddf(pathname
, fmt
, args
);
454 return cleanup_path(pathname
->buf
);
457 static void do_submodule_path(struct strbuf
*buf
, const char *path
,
458 const char *fmt
, va_list args
)
461 struct strbuf git_submodule_common_dir
= STRBUF_INIT
;
462 struct strbuf git_submodule_dir
= STRBUF_INIT
;
464 strbuf_addstr(buf
, path
);
465 strbuf_complete(buf
, '/');
466 strbuf_addstr(buf
, ".git");
468 git_dir
= read_gitfile(buf
->buf
);
471 strbuf_addstr(buf
, git_dir
);
473 strbuf_addch(buf
, '/');
474 strbuf_addstr(&git_submodule_dir
, buf
->buf
);
476 strbuf_vaddf(buf
, fmt
, args
);
478 if (get_common_dir_noenv(&git_submodule_common_dir
, git_submodule_dir
.buf
))
479 update_common_dir(buf
, git_submodule_dir
.len
, git_submodule_common_dir
.buf
);
481 strbuf_cleanup_path(buf
);
483 strbuf_release(&git_submodule_dir
);
484 strbuf_release(&git_submodule_common_dir
);
487 char *git_pathdup_submodule(const char *path
, const char *fmt
, ...)
490 struct strbuf buf
= STRBUF_INIT
;
492 do_submodule_path(&buf
, path
, fmt
, args
);
494 return strbuf_detach(&buf
, NULL
);
497 void strbuf_git_path_submodule(struct strbuf
*buf
, const char *path
,
498 const char *fmt
, ...)
502 do_submodule_path(buf
, path
, fmt
, args
);
506 int validate_headref(const char *path
)
509 char *buf
, buffer
[256];
510 unsigned char sha1
[20];
514 if (lstat(path
, &st
) < 0)
517 /* Make sure it is a "refs/.." symlink */
518 if (S_ISLNK(st
.st_mode
)) {
519 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
520 if (len
>= 5 && !memcmp("refs/", buffer
, 5))
526 * Anything else, just open it and try to see if it is a symbolic ref.
528 fd
= open(path
, O_RDONLY
);
531 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
535 * Is it a symbolic ref?
539 if (!memcmp("ref:", buffer
, 4)) {
542 while (len
&& isspace(*buf
))
544 if (len
>= 5 && !memcmp("refs/", buf
, 5))
549 * Is this a detached HEAD?
551 if (!get_sha1_hex(buffer
, sha1
))
557 static struct passwd
*getpw_str(const char *username
, size_t len
)
560 char *username_z
= xmemdupz(username
, len
);
561 pw
= getpwnam(username_z
);
567 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
568 * then it is a newly allocated string. Returns NULL on getpw failure or
571 char *expand_user_path(const char *path
)
573 struct strbuf user_path
= STRBUF_INIT
;
574 const char *to_copy
= path
;
578 if (path
[0] == '~') {
579 const char *first_slash
= strchrnul(path
, '/');
580 const char *username
= path
+ 1;
581 size_t username_len
= first_slash
- username
;
582 if (username_len
== 0) {
583 const char *home
= getenv("HOME");
586 strbuf_addstr(&user_path
, home
);
587 #ifdef GIT_WINDOWS_NATIVE
588 convert_slashes(user_path
.buf
);
591 struct passwd
*pw
= getpw_str(username
, username_len
);
594 strbuf_addstr(&user_path
, pw
->pw_dir
);
596 to_copy
= first_slash
;
598 strbuf_addstr(&user_path
, to_copy
);
599 return strbuf_detach(&user_path
, NULL
);
601 strbuf_release(&user_path
);
606 * First, one directory to try is determined by the following algorithm.
608 * (0) If "strict" is given, the path is used as given and no DWIM is
610 * (1) "~/path" to mean path under the running user's home directory;
611 * (2) "~user/path" to mean path under named user's home directory;
612 * (3) "relative/path" to mean cwd relative directory; or
613 * (4) "/absolute/path" to mean absolute directory.
615 * Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git"
616 * in this order. We select the first one that is a valid git repository, and
617 * chdir() to it. If none match, or we fail to chdir, we return NULL.
619 * If all goes well, we return the directory we used to chdir() (but
620 * before ~user is expanded), avoiding getcwd() resolving symbolic
621 * links. User relative paths are also returned as they are given,
622 * except DWIM suffixing.
624 const char *enter_repo(const char *path
, int strict
)
626 static struct strbuf validated_path
= STRBUF_INIT
;
627 static struct strbuf used_path
= STRBUF_INIT
;
633 static const char *suffix
[] = {
634 "/.git", "", ".git/.git", ".git", NULL
,
637 int len
= strlen(path
);
639 while ((1 < len
) && (path
[len
-1] == '/'))
643 * We can handle arbitrary-sized buffers, but this remains as a
644 * sanity check on untrusted input.
649 strbuf_reset(&used_path
);
650 strbuf_reset(&validated_path
);
651 strbuf_add(&used_path
, path
, len
);
652 strbuf_add(&validated_path
, path
, len
);
654 if (used_path
.buf
[0] == '~') {
655 char *newpath
= expand_user_path(used_path
.buf
);
658 strbuf_attach(&used_path
, newpath
, strlen(newpath
),
661 for (i
= 0; suffix
[i
]; i
++) {
663 size_t baselen
= used_path
.len
;
664 strbuf_addstr(&used_path
, suffix
[i
]);
665 if (!stat(used_path
.buf
, &st
) &&
666 (S_ISREG(st
.st_mode
) ||
667 (S_ISDIR(st
.st_mode
) && is_git_directory(used_path
.buf
)))) {
668 strbuf_addstr(&validated_path
, suffix
[i
]);
671 strbuf_setlen(&used_path
, baselen
);
675 gitfile
= read_gitfile(used_path
.buf
);
677 strbuf_reset(&used_path
);
678 strbuf_addstr(&used_path
, gitfile
);
680 if (chdir(used_path
.buf
))
682 path
= validated_path
.buf
;
685 const char *gitfile
= read_gitfile(path
);
692 if (is_git_directory(".")) {
694 check_repository_format();
701 static int calc_shared_perm(int mode
)
705 if (shared_repository
< 0)
706 tweak
= -shared_repository
;
708 tweak
= shared_repository
;
710 if (!(mode
& S_IWUSR
))
713 /* Copy read bits to execute bits */
714 tweak
|= (tweak
& 0444) >> 2;
715 if (shared_repository
< 0)
716 mode
= (mode
& ~0777) | tweak
;
724 int adjust_shared_perm(const char *path
)
726 int old_mode
, new_mode
;
728 if (!shared_repository
)
730 if (get_st_mode_bits(path
, &old_mode
) < 0)
733 new_mode
= calc_shared_perm(old_mode
);
734 if (S_ISDIR(old_mode
)) {
735 /* Copy read bits to execute bits */
736 new_mode
|= (new_mode
& 0444) >> 2;
737 new_mode
|= FORCE_DIR_SET_GID
;
740 if (((old_mode
^ new_mode
) & ~S_IFMT
) &&
741 chmod(path
, (new_mode
& ~S_IFMT
)) < 0)
746 void safe_create_dir(const char *dir
, int share
)
748 if (mkdir(dir
, 0777) < 0) {
749 if (errno
!= EEXIST
) {
754 else if (share
&& adjust_shared_perm(dir
))
755 die(_("Could not make %s writable by group"), dir
);
758 static int have_same_root(const char *path1
, const char *path2
)
760 int is_abs1
, is_abs2
;
762 is_abs1
= is_absolute_path(path1
);
763 is_abs2
= is_absolute_path(path2
);
764 return (is_abs1
&& is_abs2
&& tolower(path1
[0]) == tolower(path2
[0])) ||
765 (!is_abs1
&& !is_abs2
);
769 * Give path as relative to prefix.
771 * The strbuf may or may not be used, so do not assume it contains the
774 const char *relative_path(const char *in
, const char *prefix
,
777 int in_len
= in
? strlen(in
) : 0;
778 int prefix_len
= prefix
? strlen(prefix
) : 0;
785 else if (!prefix_len
)
788 if (have_same_root(in
, prefix
))
789 /* bypass dos_drive, for "c:" is identical to "C:" */
790 i
= j
= has_dos_drive_prefix(in
);
795 while (i
< prefix_len
&& j
< in_len
&& prefix
[i
] == in
[j
]) {
796 if (is_dir_sep(prefix
[i
])) {
797 while (is_dir_sep(prefix
[i
]))
799 while (is_dir_sep(in
[j
]))
810 /* "prefix" seems like prefix of "in" */
813 * but "/foo" is not a prefix of "/foobar"
814 * (i.e. prefix not end with '/')
816 prefix_off
< prefix_len
) {
818 /* in="/a/b", prefix="/a/b" */
820 } else if (is_dir_sep(in
[j
])) {
821 /* in="/a/b/c", prefix="/a/b" */
822 while (is_dir_sep(in
[j
]))
826 /* in="/a/bbb/c", prefix="/a/b" */
830 /* "in" is short than "prefix" */
832 /* "in" not end with '/' */
834 if (is_dir_sep(prefix
[i
])) {
835 /* in="/a/b", prefix="/a/b/c/" */
836 while (is_dir_sep(prefix
[i
]))
844 if (i
>= prefix_len
) {
852 strbuf_grow(sb
, in_len
);
854 while (i
< prefix_len
) {
855 if (is_dir_sep(prefix
[i
])) {
856 strbuf_addstr(sb
, "../");
857 while (is_dir_sep(prefix
[i
]))
863 if (!is_dir_sep(prefix
[prefix_len
- 1]))
864 strbuf_addstr(sb
, "../");
866 strbuf_addstr(sb
, in
);
872 * A simpler implementation of relative_path
874 * Get relative path by removing "prefix" from "in". This function
875 * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
876 * to increase performance when traversing the path to work_tree.
878 const char *remove_leading_path(const char *in
, const char *prefix
)
880 static struct strbuf buf
= STRBUF_INIT
;
883 if (!prefix
|| !prefix
[0])
886 if (is_dir_sep(prefix
[i
])) {
887 if (!is_dir_sep(in
[j
]))
889 while (is_dir_sep(prefix
[i
]))
891 while (is_dir_sep(in
[j
]))
894 } else if (in
[j
] != prefix
[i
]) {
901 /* "/foo" is a prefix of "/foo" */
903 /* "/foo" is not a prefix of "/foobar" */
904 !is_dir_sep(prefix
[i
-1]) && !is_dir_sep(in
[j
])
907 while (is_dir_sep(in
[j
]))
912 strbuf_addstr(&buf
, ".");
914 strbuf_addstr(&buf
, in
+ j
);
919 * It is okay if dst == src, but they should not overlap otherwise.
921 * Performs the following normalizations on src, storing the result in dst:
922 * - Ensures that components are separated by '/' (Windows only)
923 * - Squashes sequences of '/'.
924 * - Removes "." components.
925 * - Removes ".." components, and the components the precede them.
926 * Returns failure (non-zero) if a ".." component appears as first path
927 * component anytime during the normalization. Otherwise, returns success (0).
929 * Note that this function is purely textual. It does not follow symlinks,
930 * verify the existence of the path, or make any system calls.
932 * prefix_len != NULL is for a specific case of prefix_pathspec():
933 * assume that src == dst and src[0..prefix_len-1] is already
934 * normalized, any time "../" eats up to the prefix_len part,
935 * prefix_len is reduced. In the end prefix_len is the remaining
936 * prefix that has not been overridden by user pathspec.
938 * NEEDSWORK: This function doesn't perform normalization w.r.t. trailing '/'.
939 * For everything but the root folder itself, the normalized path should not
940 * end with a '/', then the callers need to be fixed up accordingly.
943 int normalize_path_copy_len(char *dst
, const char *src
, int *prefix_len
)
948 for (i
= has_dos_drive_prefix(src
); i
> 0; i
--)
952 if (is_dir_sep(*src
)) {
954 while (is_dir_sep(*src
))
962 * A path component that begins with . could be
964 * (1) "." and ends -- ignore and terminate.
965 * (2) "./" -- ignore them, eat slash and continue.
966 * (3) ".." and ends -- strip one and terminate.
967 * (4) "../" -- strip one, eat slash and continue.
973 } else if (is_dir_sep(src
[1])) {
976 while (is_dir_sep(*src
))
979 } else if (src
[1] == '.') {
984 } else if (is_dir_sep(src
[2])) {
987 while (is_dir_sep(*src
))
994 /* copy up to the next '/', and eat all '/' */
995 while ((c
= *src
++) != '\0' && !is_dir_sep(c
))
999 while (is_dir_sep(c
))
1008 * dst0..dst is prefix portion, and dst[-1] is '/';
1011 dst
--; /* go to trailing '/' */
1014 /* Windows: dst[-1] cannot be backslash anymore */
1015 while (dst0
< dst
&& dst
[-1] != '/')
1017 if (prefix_len
&& *prefix_len
> dst
- dst0
)
1018 *prefix_len
= dst
- dst0
;
1024 int normalize_path_copy(char *dst
, const char *src
)
1026 return normalize_path_copy_len(dst
, src
, NULL
);
1030 * path = Canonical absolute path
1031 * prefixes = string_list containing normalized, absolute paths without
1032 * trailing slashes (except for the root directory, which is denoted by "/").
1034 * Determines, for each path in prefixes, whether the "prefix"
1035 * is an ancestor directory of path. Returns the length of the longest
1036 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
1037 * is an ancestor. (Note that this means 0 is returned if prefixes is
1038 * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
1039 * are not considered to be their own ancestors. path must be in a
1040 * canonical form: empty components, or "." or ".." components are not
1043 int longest_ancestor_length(const char *path
, struct string_list
*prefixes
)
1045 int i
, max_len
= -1;
1047 if (!strcmp(path
, "/"))
1050 for (i
= 0; i
< prefixes
->nr
; i
++) {
1051 const char *ceil
= prefixes
->items
[i
].string
;
1052 int len
= strlen(ceil
);
1054 if (len
== 1 && ceil
[0] == '/')
1055 len
= 0; /* root matches anything, with length 0 */
1056 else if (!strncmp(path
, ceil
, len
) && path
[len
] == '/')
1057 ; /* match of length len */
1059 continue; /* no match */
1068 /* strip arbitrary amount of directory separators at end of path */
1069 static inline int chomp_trailing_dir_sep(const char *path
, int len
)
1071 while (len
&& is_dir_sep(path
[len
- 1]))
1077 * If path ends with suffix (complete path components), returns the
1078 * part before suffix (sans trailing directory separators).
1079 * Otherwise returns NULL.
1081 char *strip_path_suffix(const char *path
, const char *suffix
)
1083 int path_len
= strlen(path
), suffix_len
= strlen(suffix
);
1085 while (suffix_len
) {
1089 if (is_dir_sep(path
[path_len
- 1])) {
1090 if (!is_dir_sep(suffix
[suffix_len
- 1]))
1092 path_len
= chomp_trailing_dir_sep(path
, path_len
);
1093 suffix_len
= chomp_trailing_dir_sep(suffix
, suffix_len
);
1095 else if (path
[--path_len
] != suffix
[--suffix_len
])
1099 if (path_len
&& !is_dir_sep(path
[path_len
- 1]))
1101 return xstrndup(path
, chomp_trailing_dir_sep(path
, path_len
));
1104 int daemon_avoid_alias(const char *p
)
1109 * This resurrects the belts and suspenders paranoia check by HPA
1110 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
1111 * does not do getcwd() based path canonicalization.
1113 * sl becomes true immediately after seeing '/' and continues to
1114 * be true as long as dots continue after that without intervening
1115 * non-dot character.
1117 if (!p
|| (*p
!= '/' && *p
!= '~'))
1127 else if (ch
== '/') {
1129 /* reject //, /./ and /../ */
1134 if (0 < ndot
&& ndot
< 3)
1135 /* reject /.$ and /..$ */
1144 else if (ch
== '/') {
1151 static int only_spaces_and_periods(const char *path
, size_t len
, size_t skip
)
1159 if (c
!= ' ' && c
!= '.')
1165 int is_ntfs_dotgit(const char *name
)
1169 for (len
= 0; ; len
++)
1170 if (!name
[len
] || name
[len
] == '\\' || is_dir_sep(name
[len
])) {
1171 if (only_spaces_and_periods(name
, len
, 4) &&
1172 !strncasecmp(name
, ".git", 4))
1174 if (only_spaces_and_periods(name
, len
, 5) &&
1175 !strncasecmp(name
, "git~1", 5))
1177 if (name
[len
] != '\\')
1184 char *xdg_config_home(const char *filename
)
1186 const char *home
, *config_home
;
1189 config_home
= getenv("XDG_CONFIG_HOME");
1190 if (config_home
&& *config_home
)
1191 return mkpathdup("%s/git/%s", config_home
, filename
);
1193 home
= getenv("HOME");
1195 return mkpathdup("%s/.config/git/%s", home
, filename
);
1199 GIT_PATH_FUNC(git_path_cherry_pick_head
, "CHERRY_PICK_HEAD")
1200 GIT_PATH_FUNC(git_path_revert_head
, "REVERT_HEAD")
1201 GIT_PATH_FUNC(git_path_squash_msg
, "SQUASH_MSG")
1202 GIT_PATH_FUNC(git_path_merge_msg
, "MERGE_MSG")
1203 GIT_PATH_FUNC(git_path_merge_rr
, "MERGE_RR")
1204 GIT_PATH_FUNC(git_path_merge_mode
, "MERGE_MODE")
1205 GIT_PATH_FUNC(git_path_merge_head
, "MERGE_HEAD")
1206 GIT_PATH_FUNC(git_path_fetch_head
, "FETCH_HEAD")
1207 GIT_PATH_FUNC(git_path_shallow
, "shallow")