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 *git_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
, ...)
75 (void)git_vsnpath(buf
, n
, fmt
, args
);
80 char *git_pathdup(const char *fmt
, ...)
85 (void)git_vsnpath(path
, sizeof(path
), fmt
, args
);
90 char *mkpath(const char *fmt
, ...)
94 char *pathname
= get_pathname();
97 len
= vsnprintf(pathname
, PATH_MAX
, fmt
, args
);
101 return cleanup_path(pathname
);
104 char *git_path(const char *fmt
, ...)
106 const char *git_dir
= get_git_dir();
107 char *pathname
= get_pathname();
111 len
= strlen(git_dir
);
112 if (len
> PATH_MAX
-100)
114 memcpy(pathname
, git_dir
, len
);
115 if (len
&& git_dir
[len
-1] != '/')
116 pathname
[len
++] = '/';
118 len
+= vsnprintf(pathname
+ len
, PATH_MAX
- len
, fmt
, args
);
122 return cleanup_path(pathname
);
126 /* git_mkstemp() - create tmp file honoring TMPDIR variable */
127 int git_mkstemp(char *path
, size_t len
, const char *template)
132 tmp
= getenv("TMPDIR");
135 n
= snprintf(path
, len
, "%s/%s", tmp
, template);
137 errno
= ENAMETOOLONG
;
140 return mkstemp(path
);
143 /* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
144 int git_mkstemps(char *path
, size_t len
, const char *template, int suffix_len
)
149 tmp
= getenv("TMPDIR");
152 n
= snprintf(path
, len
, "%s/%s", tmp
, template);
154 errno
= ENAMETOOLONG
;
157 return mkstemps(path
, suffix_len
);
160 int validate_headref(const char *path
)
163 char *buf
, buffer
[256];
164 unsigned char sha1
[20];
168 if (lstat(path
, &st
) < 0)
171 /* Make sure it is a "refs/.." symlink */
172 if (S_ISLNK(st
.st_mode
)) {
173 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
174 if (len
>= 5 && !memcmp("refs/", buffer
, 5))
180 * Anything else, just open it and try to see if it is a symbolic ref.
182 fd
= open(path
, O_RDONLY
);
185 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
189 * Is it a symbolic ref?
193 if (!memcmp("ref:", buffer
, 4)) {
196 while (len
&& isspace(*buf
))
198 if (len
>= 5 && !memcmp("refs/", buf
, 5))
203 * Is this a detached HEAD?
205 if (!get_sha1_hex(buffer
, sha1
))
211 static struct passwd
*getpw_str(const char *username
, size_t len
)
214 char *username_z
= xmalloc(len
+ 1);
215 memcpy(username_z
, username
, len
);
216 username_z
[len
] = '\0';
217 pw
= getpwnam(username_z
);
223 * Return a string with ~ and ~user expanded via getpw*. If buf != NULL,
224 * then it is a newly allocated string. Returns NULL on getpw failure or
227 char *expand_user_path(const char *path
)
229 struct strbuf user_path
= STRBUF_INIT
;
230 const char *first_slash
= strchrnul(path
, '/');
231 const char *to_copy
= path
;
235 if (path
[0] == '~') {
236 const char *username
= path
+ 1;
237 size_t username_len
= first_slash
- username
;
238 struct passwd
*pw
= getpw_str(username
, username_len
);
241 strbuf_add(&user_path
, pw
->pw_dir
, strlen(pw
->pw_dir
));
242 to_copy
= first_slash
;
244 strbuf_add(&user_path
, to_copy
, strlen(to_copy
));
245 return strbuf_detach(&user_path
, NULL
);
247 strbuf_release(&user_path
);
252 * First, one directory to try is determined by the following algorithm.
254 * (0) If "strict" is given, the path is used as given and no DWIM is
256 * (1) "~/path" to mean path under the running user's home directory;
257 * (2) "~user/path" to mean path under named user's home directory;
258 * (3) "relative/path" to mean cwd relative directory; or
259 * (4) "/absolute/path" to mean absolute directory.
261 * Unless "strict" is given, we try access() for existence of "%s.git/.git",
262 * "%s/.git", "%s.git", "%s" in this order. The first one that exists is
265 * Second, we try chdir() to that. Upon failure, we return NULL.
267 * Then, we try if the current directory is a valid git repository.
268 * Upon failure, we return NULL.
270 * If all goes well, we return the directory we used to chdir() (but
271 * before ~user is expanded), avoiding getcwd() resolving symbolic
272 * links. User relative paths are also returned as they are given,
273 * except DWIM suffixing.
275 char *enter_repo(char *path
, int strict
)
277 static char used_path
[PATH_MAX
];
278 static char validated_path
[PATH_MAX
];
284 static const char *suffix
[] = {
285 ".git/.git", "/.git", ".git", "", NULL
,
287 int len
= strlen(path
);
289 while ((1 < len
) && (path
[len
-1] == '/')) {
295 if (path
[0] == '~') {
296 char *newpath
= expand_user_path(path
);
297 if (!newpath
|| (PATH_MAX
- 10 < strlen(newpath
))) {
302 * Copy back into the static buffer. A pity
303 * since newpath was not bounded, but other
304 * branches of the if are limited by PATH_MAX
307 strcpy(used_path
, newpath
); free(newpath
);
308 strcpy(validated_path
, path
);
311 else if (PATH_MAX
- 10 < len
)
314 path
= strcpy(used_path
, path
);
315 strcpy(validated_path
, path
);
318 for (i
= 0; suffix
[i
]; i
++) {
319 strcpy(path
+ len
, suffix
[i
]);
320 if (!access(path
, F_OK
)) {
321 strcat(validated_path
, suffix
[i
]);
325 if (!suffix
[i
] || chdir(path
))
327 path
= validated_path
;
329 else if (chdir(path
))
332 if (access("objects", X_OK
) == 0 && access("refs", X_OK
) == 0 &&
333 validate_headref("HEAD") == 0) {
334 setenv(GIT_DIR_ENVIRONMENT
, ".", 1);
335 check_repository_format();
342 int set_shared_perm(const char *path
, int mode
)
345 int tweak
, shared
, orig_mode
;
347 if (!shared_repository
) {
349 return chmod(path
, mode
& ~S_IFMT
);
353 if (lstat(path
, &st
) < 0)
359 if (shared_repository
< 0)
360 shared
= -shared_repository
;
362 shared
= shared_repository
;
365 if (!(mode
& S_IWUSR
))
368 /* Copy read bits to execute bits */
369 tweak
|= (tweak
& 0444) >> 2;
370 if (shared_repository
< 0)
371 mode
= (mode
& ~0777) | tweak
;
376 /* Copy read bits to execute bits */
377 mode
|= (shared
& 0444) >> 2;
378 mode
|= FORCE_DIR_SET_GID
;
381 if (((shared_repository
< 0
382 ? (orig_mode
& (FORCE_DIR_SET_GID
| 0777))
383 : (orig_mode
& mode
)) != mode
) &&
384 chmod(path
, (mode
& ~S_IFMT
)) < 0)
389 const char *make_relative_path(const char *abs
, const char *base
)
391 static char buf
[PATH_MAX
+ 1];
395 baselen
= strlen(base
);
396 if (prefixcmp(abs
, base
))
398 if (abs
[baselen
] == '/')
400 else if (base
[baselen
- 1] != '/')
402 strcpy(buf
, abs
+ baselen
);
407 * It is okay if dst == src, but they should not overlap otherwise.
409 * Performs the following normalizations on src, storing the result in dst:
410 * - Ensures that components are separated by '/' (Windows only)
411 * - Squashes sequences of '/'.
412 * - Removes "." components.
413 * - Removes ".." components, and the components the precede them.
414 * Returns failure (non-zero) if a ".." component appears as first path
415 * component anytime during the normalization. Otherwise, returns success (0).
417 * Note that this function is purely textual. It does not follow symlinks,
418 * verify the existence of the path, or make any system calls.
420 int normalize_path_copy(char *dst
, const char *src
)
424 if (has_dos_drive_prefix(src
)) {
430 if (is_dir_sep(*src
)) {
432 while (is_dir_sep(*src
))
440 * A path component that begins with . could be
442 * (1) "." and ends -- ignore and terminate.
443 * (2) "./" -- ignore them, eat slash and continue.
444 * (3) ".." and ends -- strip one and terminate.
445 * (4) "../" -- strip one, eat slash and continue.
451 } else if (is_dir_sep(src
[1])) {
454 while (is_dir_sep(*src
))
457 } else if (src
[1] == '.') {
462 } else if (is_dir_sep(src
[2])) {
465 while (is_dir_sep(*src
))
472 /* copy up to the next '/', and eat all '/' */
473 while ((c
= *src
++) != '\0' && !is_dir_sep(c
))
477 while (is_dir_sep(c
))
486 * dst0..dst is prefix portion, and dst[-1] is '/';
489 dst
--; /* go to trailing '/' */
492 /* Windows: dst[-1] cannot be backslash anymore */
493 while (dst0
< dst
&& dst
[-1] != '/')
501 * path = Canonical absolute path
502 * prefix_list = Colon-separated list of absolute paths
504 * Determines, for each path in prefix_list, whether the "prefix" really
505 * is an ancestor directory of path. Returns the length of the longest
506 * ancestor directory, excluding any trailing slashes, or -1 if no prefix
507 * is an ancestor. (Note that this means 0 is returned if prefix_list is
508 * "/".) "/foo" is not considered an ancestor of "/foobar". Directories
509 * are not considered to be their own ancestors. path must be in a
510 * canonical form: empty components, or "." or ".." components are not
511 * allowed. prefix_list may be null, which is like "".
513 int longest_ancestor_length(const char *path
, const char *prefix_list
)
515 char buf
[PATH_MAX
+1];
516 const char *ceil
, *colon
;
517 int len
, max_len
= -1;
519 if (prefix_list
== NULL
|| !strcmp(path
, "/"))
522 for (colon
= ceil
= prefix_list
; *colon
; ceil
= colon
+1) {
523 for (colon
= ceil
; *colon
&& *colon
!= PATH_SEP
; colon
++);
525 if (len
== 0 || len
> PATH_MAX
|| !is_absolute_path(ceil
))
527 strlcpy(buf
, ceil
, len
+1);
528 if (normalize_path_copy(buf
, buf
) < 0)
531 if (len
> 0 && buf
[len
-1] == '/')
534 if (!strncmp(path
, buf
, len
) &&
544 /* strip arbitrary amount of directory separators at end of path */
545 static inline int chomp_trailing_dir_sep(const char *path
, int len
)
547 while (len
&& is_dir_sep(path
[len
- 1]))
553 * If path ends with suffix (complete path components), returns the
554 * part before suffix (sans trailing directory separators).
555 * Otherwise returns NULL.
557 char *strip_path_suffix(const char *path
, const char *suffix
)
559 int path_len
= strlen(path
), suffix_len
= strlen(suffix
);
565 if (is_dir_sep(path
[path_len
- 1])) {
566 if (!is_dir_sep(suffix
[suffix_len
- 1]))
568 path_len
= chomp_trailing_dir_sep(path
, path_len
);
569 suffix_len
= chomp_trailing_dir_sep(suffix
, suffix_len
);
571 else if (path
[--path_len
] != suffix
[--suffix_len
])
575 if (path_len
&& !is_dir_sep(path
[path_len
- 1]))
577 return xstrndup(path
, chomp_trailing_dir_sep(path
, path_len
));