2 * Utilities for paths and pathnames
6 #include "string-list.h"
8 static int get_st_mode_bits(const char *path
, int *mode
)
11 if (lstat(path
, &st
) < 0)
17 static char bad_path
[] = "/bad-path/";
19 static char *get_pathname(void)
21 static char pathname_array
[4][PATH_MAX
];
23 return pathname_array
[3 & ++index
];
26 static char *cleanup_path(char *path
)
29 if (!memcmp(path
, "./", 2)) {
37 char *mksnpath(char *buf
, size_t n
, const char *fmt
, ...)
43 len
= vsnprintf(buf
, n
, fmt
, args
);
46 strlcpy(buf
, bad_path
, n
);
49 return cleanup_path(buf
);
52 static char *vsnpath(char *buf
, size_t n
, const char *fmt
, va_list args
)
54 const char *git_dir
= get_git_dir();
57 len
= strlen(git_dir
);
60 memcpy(buf
, git_dir
, len
);
61 if (len
&& !is_dir_sep(git_dir
[len
-1]))
63 len
+= vsnprintf(buf
+ len
, n
- len
, fmt
, args
);
66 return cleanup_path(buf
);
68 strlcpy(buf
, bad_path
, n
);
72 char *git_snpath(char *buf
, size_t n
, const char *fmt
, ...)
77 ret
= vsnpath(buf
, n
, fmt
, args
);
82 char *git_pathdup(const char *fmt
, ...)
84 char path
[PATH_MAX
], *ret
;
87 ret
= vsnpath(path
, sizeof(path
), fmt
, args
);
92 char *mkpathdup(const char *fmt
, ...)
95 struct strbuf sb
= STRBUF_INIT
;
99 strbuf_vaddf(&sb
, fmt
, args
);
101 path
= xstrdup(cleanup_path(sb
.buf
));
107 char *mkpath(const char *fmt
, ...)
111 char *pathname
= get_pathname();
114 len
= vsnprintf(pathname
, PATH_MAX
, fmt
, args
);
118 return cleanup_path(pathname
);
121 char *git_path(const char *fmt
, ...)
123 char *pathname
= get_pathname();
128 ret
= vsnpath(pathname
, PATH_MAX
, fmt
, args
);
133 void home_config_paths(char **global
, char **xdg
, char *file
)
135 char *xdg_home
= getenv("XDG_CONFIG_HOME");
136 char *home
= getenv("HOME");
137 char *to_free
= NULL
;
144 to_free
= mkpathdup("%s/.config", home
);
148 *global
= mkpathdup("%s/.gitconfig", home
);
154 *xdg
= mkpathdup("%s/git/%s", xdg_home
, file
);
159 char *git_path_submodule(const char *path
, const char *fmt
, ...)
161 char *pathname
= get_pathname();
162 struct strbuf buf
= STRBUF_INIT
;
168 if (len
> PATH_MAX
-100)
171 strbuf_addstr(&buf
, path
);
172 if (len
&& path
[len
-1] != '/')
173 strbuf_addch(&buf
, '/');
174 strbuf_addstr(&buf
, ".git");
176 git_dir
= read_gitfile(buf
.buf
);
179 strbuf_addstr(&buf
, git_dir
);
181 strbuf_addch(&buf
, '/');
183 if (buf
.len
>= PATH_MAX
)
185 memcpy(pathname
, buf
.buf
, buf
.len
+ 1);
187 strbuf_release(&buf
);
188 len
= strlen(pathname
);
191 len
+= vsnprintf(pathname
+ len
, PATH_MAX
- len
, fmt
, args
);
195 return cleanup_path(pathname
);
198 int validate_headref(const char *path
)
201 char *buf
, buffer
[256];
202 unsigned char sha1
[20];
206 if (lstat(path
, &st
) < 0)
209 /* Make sure it is a "refs/.." symlink */
210 if (S_ISLNK(st
.st_mode
)) {
211 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
212 if (len
>= 5 && !memcmp("refs/", buffer
, 5))
218 * Anything else, just open it and try to see if it is a symbolic ref.
220 fd
= open(path
, O_RDONLY
);
223 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
227 * Is it a symbolic ref?
231 if (!memcmp("ref:", buffer
, 4)) {
234 while (len
&& isspace(*buf
))
236 if (len
>= 5 && !memcmp("refs/", buf
, 5))
241 * Is this a detached HEAD?
243 if (!get_sha1_hex(buffer
, sha1
))
249 static struct passwd
*getpw_str(const char *username
, size_t len
)
252 char *username_z
= xmemdupz(username
, len
);
253 pw
= getpwnam(username_z
);
259 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
260 * then it is a newly allocated string. Returns NULL on getpw failure or
263 char *expand_user_path(const char *path
)
265 struct strbuf user_path
= STRBUF_INIT
;
266 const char *to_copy
= path
;
270 if (path
[0] == '~') {
271 const char *first_slash
= strchrnul(path
, '/');
272 const char *username
= path
+ 1;
273 size_t username_len
= first_slash
- username
;
274 if (username_len
== 0) {
275 const char *home
= getenv("HOME");
278 strbuf_add(&user_path
, home
, strlen(home
));
280 struct passwd
*pw
= getpw_str(username
, username_len
);
283 strbuf_add(&user_path
, pw
->pw_dir
, strlen(pw
->pw_dir
));
285 to_copy
= first_slash
;
287 strbuf_add(&user_path
, to_copy
, strlen(to_copy
));
288 return strbuf_detach(&user_path
, NULL
);
290 strbuf_release(&user_path
);
295 * First, one directory to try is determined by the following algorithm.
297 * (0) If "strict" is given, the path is used as given and no DWIM is
299 * (1) "~/path" to mean path under the running user's home directory;
300 * (2) "~user/path" to mean path under named user's home directory;
301 * (3) "relative/path" to mean cwd relative directory; or
302 * (4) "/absolute/path" to mean absolute directory.
304 * Unless "strict" is given, we try access() for existence of "%s.git/.git",
305 * "%s/.git", "%s.git", "%s" in this order. The first one that exists is
308 * Second, we try chdir() to that. Upon failure, we return NULL.
310 * Then, we try if the current directory is a valid git repository.
311 * Upon failure, we return NULL.
313 * If all goes well, we return the directory we used to chdir() (but
314 * before ~user is expanded), avoiding getcwd() resolving symbolic
315 * links. User relative paths are also returned as they are given,
316 * except DWIM suffixing.
318 const char *enter_repo(const char *path
, int strict
)
320 static char used_path
[PATH_MAX
];
321 static char validated_path
[PATH_MAX
];
327 static const char *suffix
[] = {
328 "/.git", "", ".git/.git", ".git", NULL
,
331 int len
= strlen(path
);
333 while ((1 < len
) && (path
[len
-1] == '/'))
338 strncpy(used_path
, path
, len
); used_path
[len
] = 0 ;
339 strcpy(validated_path
, used_path
);
341 if (used_path
[0] == '~') {
342 char *newpath
= expand_user_path(used_path
);
343 if (!newpath
|| (PATH_MAX
- 10 < strlen(newpath
))) {
348 * Copy back into the static buffer. A pity
349 * since newpath was not bounded, but other
350 * branches of the if are limited by PATH_MAX
353 strcpy(used_path
, newpath
); free(newpath
);
355 else if (PATH_MAX
- 10 < len
)
357 len
= strlen(used_path
);
358 for (i
= 0; suffix
[i
]; i
++) {
360 strcpy(used_path
+ len
, suffix
[i
]);
361 if (!stat(used_path
, &st
) &&
362 (S_ISREG(st
.st_mode
) ||
363 (S_ISDIR(st
.st_mode
) && is_git_directory(used_path
)))) {
364 strcat(validated_path
, suffix
[i
]);
370 gitfile
= read_gitfile(used_path
) ;
372 strcpy(used_path
, gitfile
);
373 if (chdir(used_path
))
375 path
= validated_path
;
377 else if (chdir(path
))
380 if (access("objects", X_OK
) == 0 && access("refs", X_OK
) == 0 &&
381 validate_headref("HEAD") == 0) {
383 check_repository_format();
390 static int calc_shared_perm(int mode
)
394 if (shared_repository
< 0)
395 tweak
= -shared_repository
;
397 tweak
= shared_repository
;
399 if (!(mode
& S_IWUSR
))
402 /* Copy read bits to execute bits */
403 tweak
|= (tweak
& 0444) >> 2;
404 if (shared_repository
< 0)
405 mode
= (mode
& ~0777) | tweak
;
413 int adjust_shared_perm(const char *path
)
415 int old_mode
, new_mode
;
417 if (!shared_repository
)
419 if (get_st_mode_bits(path
, &old_mode
) < 0)
422 new_mode
= calc_shared_perm(old_mode
);
423 if (S_ISDIR(old_mode
)) {
424 /* Copy read bits to execute bits */
425 new_mode
|= (new_mode
& 0444) >> 2;
426 new_mode
|= FORCE_DIR_SET_GID
;
429 if (((old_mode
^ new_mode
) & ~S_IFMT
) &&
430 chmod(path
, (new_mode
& ~S_IFMT
)) < 0)
435 static int have_same_root(const char *path1
, const char *path2
)
437 int is_abs1
, is_abs2
;
439 is_abs1
= is_absolute_path(path1
);
440 is_abs2
= is_absolute_path(path2
);
441 return (is_abs1
&& is_abs2
&& tolower(path1
[0]) == tolower(path2
[0])) ||
442 (!is_abs1
&& !is_abs2
);
446 * Give path as relative to prefix.
448 * The strbuf may or may not be used, so do not assume it contains the
451 const char *relative_path(const char *in
, const char *prefix
,
454 int in_len
= in
? strlen(in
) : 0;
455 int prefix_len
= prefix
? strlen(prefix
) : 0;
462 else if (!prefix_len
)
465 if (have_same_root(in
, prefix
)) {
466 /* bypass dos_drive, for "c:" is identical to "C:" */
467 if (has_dos_drive_prefix(in
)) {
475 while (i
< prefix_len
&& j
< in_len
&& prefix
[i
] == in
[j
]) {
476 if (is_dir_sep(prefix
[i
])) {
477 while (is_dir_sep(prefix
[i
]))
479 while (is_dir_sep(in
[j
]))
490 /* "prefix" seems like prefix of "in" */
493 * but "/foo" is not a prefix of "/foobar"
494 * (i.e. prefix not end with '/')
496 prefix_off
< prefix_len
) {
498 /* in="/a/b", prefix="/a/b" */
500 } else if (is_dir_sep(in
[j
])) {
501 /* in="/a/b/c", prefix="/a/b" */
502 while (is_dir_sep(in
[j
]))
506 /* in="/a/bbb/c", prefix="/a/b" */
510 /* "in" is short than "prefix" */
512 /* "in" not end with '/' */
514 if (is_dir_sep(prefix
[i
])) {
515 /* in="/a/b", prefix="/a/b/c/" */
516 while (is_dir_sep(prefix
[i
]))
524 if (i
>= prefix_len
) {
532 strbuf_grow(sb
, in_len
);
534 while (i
< prefix_len
) {
535 if (is_dir_sep(prefix
[i
])) {
536 strbuf_addstr(sb
, "../");
537 while (is_dir_sep(prefix
[i
]))
543 if (!is_dir_sep(prefix
[prefix_len
- 1]))
544 strbuf_addstr(sb
, "../");
546 strbuf_addstr(sb
, in
);
552 * A simpler implementation of relative_path
554 * Get relative path by removing "prefix" from "in". This function
555 * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter
556 * to increase performance when traversing the path to work_tree.
558 const char *remove_leading_path(const char *in
, const char *prefix
)
560 static char buf
[PATH_MAX
+ 1];
563 if (!prefix
|| !prefix
[0])
566 if (is_dir_sep(prefix
[i
])) {
567 if (!is_dir_sep(in
[j
]))
569 while (is_dir_sep(prefix
[i
]))
571 while (is_dir_sep(in
[j
]))
574 } else if (in
[j
] != prefix
[i
]) {
581 /* "/foo" is a prefix of "/foo" */
583 /* "/foo" is not a prefix of "/foobar" */
584 !is_dir_sep(prefix
[i
-1]) && !is_dir_sep(in
[j
])
587 while (is_dir_sep(in
[j
]))
597 * It is okay if dst == src, but they should not overlap otherwise.
599 * Performs the following normalizations on src, storing the result in dst:
600 * - Ensures that components are separated by '/' (Windows only)
601 * - Squashes sequences of '/'.
602 * - Removes "." components.
603 * - Removes ".." components, and the components the precede them.
604 * Returns failure (non-zero) if a ".." component appears as first path
605 * component anytime during the normalization. Otherwise, returns success (0).
607 * Note that this function is purely textual. It does not follow symlinks,
608 * verify the existence of the path, or make any system calls.
610 * prefix_len != NULL is for a specific case of prefix_pathspec():
611 * assume that src == dst and src[0..prefix_len-1] is already
612 * normalized, any time "../" eats up to the prefix_len part,
613 * prefix_len is reduced. In the end prefix_len is the remaining
614 * prefix that has not been overridden by user pathspec.
616 int normalize_path_copy_len(char *dst
, const char *src
, int *prefix_len
)
620 if (has_dos_drive_prefix(src
)) {
626 if (is_dir_sep(*src
)) {
628 while (is_dir_sep(*src
))
636 * A path component that begins with . could be
638 * (1) "." and ends -- ignore and terminate.
639 * (2) "./" -- ignore them, eat slash and continue.
640 * (3) ".." and ends -- strip one and terminate.
641 * (4) "../" -- strip one, eat slash and continue.
647 } else if (is_dir_sep(src
[1])) {
650 while (is_dir_sep(*src
))
653 } else if (src
[1] == '.') {
658 } else if (is_dir_sep(src
[2])) {
661 while (is_dir_sep(*src
))
668 /* copy up to the next '/', and eat all '/' */
669 while ((c
= *src
++) != '\0' && !is_dir_sep(c
))
673 while (is_dir_sep(c
))
682 * dst0..dst is prefix portion, and dst[-1] is '/';
685 dst
--; /* go to trailing '/' */
688 /* Windows: dst[-1] cannot be backslash anymore */
689 while (dst0
< dst
&& dst
[-1] != '/')
691 if (prefix_len
&& *prefix_len
> dst
- dst0
)
692 *prefix_len
= dst
- dst0
;
698 int normalize_path_copy(char *dst
, const char *src
)
700 return normalize_path_copy_len(dst
, src
, NULL
);
704 * path = Canonical absolute path
705 * prefixes = string_list containing normalized, absolute paths without
706 * trailing slashes (except for the root directory, which is denoted by "/").
708 * Determines, for each path in prefixes, whether the "prefix"
709 * is an ancestor directory of path. Returns the length of the longest
710 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
711 * is an ancestor. (Note that this means 0 is returned if prefixes is
712 * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories
713 * are not considered to be their own ancestors. path must be in a
714 * canonical form: empty components, or "." or ".." components are not
717 int longest_ancestor_length(const char *path
, struct string_list
*prefixes
)
721 if (!strcmp(path
, "/"))
724 for (i
= 0; i
< prefixes
->nr
; i
++) {
725 const char *ceil
= prefixes
->items
[i
].string
;
726 int len
= strlen(ceil
);
728 if (len
== 1 && ceil
[0] == '/')
729 len
= 0; /* root matches anything, with length 0 */
730 else if (!strncmp(path
, ceil
, len
) && path
[len
] == '/')
731 ; /* match of length len */
733 continue; /* no match */
742 /* strip arbitrary amount of directory separators at end of path */
743 static inline int chomp_trailing_dir_sep(const char *path
, int len
)
745 while (len
&& is_dir_sep(path
[len
- 1]))
751 * If path ends with suffix (complete path components), returns the
752 * part before suffix (sans trailing directory separators).
753 * Otherwise returns NULL.
755 char *strip_path_suffix(const char *path
, const char *suffix
)
757 int path_len
= strlen(path
), suffix_len
= strlen(suffix
);
763 if (is_dir_sep(path
[path_len
- 1])) {
764 if (!is_dir_sep(suffix
[suffix_len
- 1]))
766 path_len
= chomp_trailing_dir_sep(path
, path_len
);
767 suffix_len
= chomp_trailing_dir_sep(suffix
, suffix_len
);
769 else if (path
[--path_len
] != suffix
[--suffix_len
])
773 if (path_len
&& !is_dir_sep(path
[path_len
- 1]))
775 return xstrndup(path
, chomp_trailing_dir_sep(path
, path_len
));
778 int daemon_avoid_alias(const char *p
)
783 * This resurrects the belts and suspenders paranoia check by HPA
784 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
785 * does not do getcwd() based path canonicalization.
787 * sl becomes true immediately after seeing '/' and continues to
788 * be true as long as dots continue after that without intervening
791 if (!p
|| (*p
!= '/' && *p
!= '~'))
801 else if (ch
== '/') {
803 /* reject //, /./ and /../ */
808 if (0 < ndot
&& ndot
< 3)
809 /* reject /.$ and /..$ */
818 else if (ch
== '/') {