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Commit | Line | Data |
---|---|---|
26c8a533 LT |
1 | /* |
2 | * I'm tired of doing "vsnprintf()" etc just to open a | |
3 | * file, so here's a "return static buffer with printf" | |
4 | * interface for paths. | |
5 | * | |
6 | * It's obviously not thread-safe. Sue me. But it's quite | |
7 | * useful for doing things like | |
8 | * | |
9 | * f = open(mkpath("%s/%s.git", base, name), O_RDONLY); | |
10 | * | |
11 | * which is what it's designed for. | |
12 | */ | |
13 | #include "cache.h" | |
14 | ||
26c8a533 LT |
15 | static char bad_path[] = "/bad-path/"; |
16 | ||
e7676d2f LT |
17 | static char *get_pathname(void) |
18 | { | |
19 | static char pathname_array[4][PATH_MAX]; | |
20 | static int index; | |
21 | return pathname_array[3 & ++index]; | |
22 | } | |
23 | ||
26c8a533 LT |
24 | static char *cleanup_path(char *path) |
25 | { | |
26 | /* Clean it up */ | |
27 | if (!memcmp(path, "./", 2)) { | |
28 | path += 2; | |
29 | while (*path == '/') | |
30 | path++; | |
31 | } | |
32 | return path; | |
33 | } | |
34 | ||
108bebea AR |
35 | char *mksnpath(char *buf, size_t n, const char *fmt, ...) |
36 | { | |
37 | va_list args; | |
38 | unsigned len; | |
39 | ||
40 | va_start(args, fmt); | |
41 | len = vsnprintf(buf, n, fmt, args); | |
42 | va_end(args); | |
43 | if (len >= n) { | |
9db56f71 | 44 | strlcpy(buf, bad_path, n); |
108bebea AR |
45 | return buf; |
46 | } | |
47 | return cleanup_path(buf); | |
48 | } | |
49 | ||
aba13e7c | 50 | static char *git_vsnpath(char *buf, size_t n, const char *fmt, va_list args) |
fe2d7776 AR |
51 | { |
52 | const char *git_dir = get_git_dir(); | |
fe2d7776 AR |
53 | size_t len; |
54 | ||
55 | len = strlen(git_dir); | |
56 | if (n < len + 1) | |
57 | goto bad; | |
58 | memcpy(buf, git_dir, len); | |
59 | if (len && !is_dir_sep(git_dir[len-1])) | |
60 | buf[len++] = '/'; | |
fe2d7776 | 61 | len += vsnprintf(buf + len, n - len, fmt, args); |
fe2d7776 AR |
62 | if (len >= n) |
63 | goto bad; | |
64 | return cleanup_path(buf); | |
65 | bad: | |
9db56f71 | 66 | strlcpy(buf, bad_path, n); |
fe2d7776 AR |
67 | return buf; |
68 | } | |
69 | ||
aba13e7c AR |
70 | char *git_snpath(char *buf, size_t n, const char *fmt, ...) |
71 | { | |
72 | va_list args; | |
73 | va_start(args, fmt); | |
74 | (void)git_vsnpath(buf, n, fmt, args); | |
75 | va_end(args); | |
76 | return buf; | |
77 | } | |
78 | ||
79 | char *git_pathdup(const char *fmt, ...) | |
80 | { | |
81 | char path[PATH_MAX]; | |
82 | va_list args; | |
83 | va_start(args, fmt); | |
84 | (void)git_vsnpath(path, sizeof(path), fmt, args); | |
85 | va_end(args); | |
86 | return xstrdup(path); | |
87 | } | |
88 | ||
26c8a533 LT |
89 | char *mkpath(const char *fmt, ...) |
90 | { | |
91 | va_list args; | |
92 | unsigned len; | |
e7676d2f | 93 | char *pathname = get_pathname(); |
26c8a533 LT |
94 | |
95 | va_start(args, fmt); | |
96 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
97 | va_end(args); | |
98 | if (len >= PATH_MAX) | |
99 | return bad_path; | |
100 | return cleanup_path(pathname); | |
101 | } | |
102 | ||
103 | char *git_path(const char *fmt, ...) | |
104 | { | |
5da1606d | 105 | const char *git_dir = get_git_dir(); |
e7676d2f | 106 | char *pathname = get_pathname(); |
26c8a533 LT |
107 | va_list args; |
108 | unsigned len; | |
109 | ||
110 | len = strlen(git_dir); | |
111 | if (len > PATH_MAX-100) | |
112 | return bad_path; | |
113 | memcpy(pathname, git_dir, len); | |
114 | if (len && git_dir[len-1] != '/') | |
115 | pathname[len++] = '/'; | |
116 | va_start(args, fmt); | |
117 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); | |
118 | va_end(args); | |
119 | if (len >= PATH_MAX) | |
120 | return bad_path; | |
121 | return cleanup_path(pathname); | |
122 | } | |
f2db68ed HE |
123 | |
124 | ||
125 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ | |
126 | int git_mkstemp(char *path, size_t len, const char *template) | |
127 | { | |
e7a7be88 JH |
128 | const char *tmp; |
129 | size_t n; | |
130 | ||
131 | tmp = getenv("TMPDIR"); | |
132 | if (!tmp) | |
133 | tmp = "/tmp"; | |
134 | n = snprintf(path, len, "%s/%s", tmp, template); | |
135 | if (len <= n) { | |
136 | errno = ENAMETOOLONG; | |
137 | return -1; | |
35c3c629 | 138 | } |
f2db68ed HE |
139 | return mkstemp(path); |
140 | } | |
141 | ||
003b33a8 DA |
142 | /* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */ |
143 | int git_mkstemps(char *path, size_t len, const char *template, int suffix_len) | |
144 | { | |
145 | const char *tmp; | |
146 | size_t n; | |
147 | ||
148 | tmp = getenv("TMPDIR"); | |
149 | if (!tmp) | |
150 | tmp = "/tmp"; | |
151 | n = snprintf(path, len, "%s/%s", tmp, template); | |
152 | if (len <= n) { | |
153 | errno = ENAMETOOLONG; | |
154 | return -1; | |
155 | } | |
156 | return mkstemps(path, suffix_len); | |
157 | } | |
f2db68ed | 158 | |
c847f537 | 159 | int validate_headref(const char *path) |
0870ca7f JH |
160 | { |
161 | struct stat st; | |
162 | char *buf, buffer[256]; | |
c847f537 | 163 | unsigned char sha1[20]; |
0104ca09 HO |
164 | int fd; |
165 | ssize_t len; | |
0870ca7f JH |
166 | |
167 | if (lstat(path, &st) < 0) | |
168 | return -1; | |
169 | ||
170 | /* Make sure it is a "refs/.." symlink */ | |
171 | if (S_ISLNK(st.st_mode)) { | |
172 | len = readlink(path, buffer, sizeof(buffer)-1); | |
222b1673 | 173 | if (len >= 5 && !memcmp("refs/", buffer, 5)) |
0870ca7f JH |
174 | return 0; |
175 | return -1; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Anything else, just open it and try to see if it is a symbolic ref. | |
180 | */ | |
181 | fd = open(path, O_RDONLY); | |
182 | if (fd < 0) | |
183 | return -1; | |
93d26e4c | 184 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
0870ca7f JH |
185 | close(fd); |
186 | ||
187 | /* | |
188 | * Is it a symbolic ref? | |
189 | */ | |
c847f537 | 190 | if (len < 4) |
0870ca7f | 191 | return -1; |
c847f537 JH |
192 | if (!memcmp("ref:", buffer, 4)) { |
193 | buf = buffer + 4; | |
194 | len -= 4; | |
195 | while (len && isspace(*buf)) | |
196 | buf++, len--; | |
222b1673 | 197 | if (len >= 5 && !memcmp("refs/", buf, 5)) |
c847f537 JH |
198 | return 0; |
199 | } | |
200 | ||
201 | /* | |
202 | * Is this a detached HEAD? | |
203 | */ | |
204 | if (!get_sha1_hex(buffer, sha1)) | |
0870ca7f | 205 | return 0; |
c847f537 | 206 | |
0870ca7f JH |
207 | return -1; |
208 | } | |
209 | ||
d79374c7 | 210 | static char *user_path(char *buf, char *path, int sz) |
54f4b874 | 211 | { |
d79374c7 JH |
212 | struct passwd *pw; |
213 | char *slash; | |
214 | int len, baselen; | |
54f4b874 | 215 | |
d79374c7 JH |
216 | if (!path || path[0] != '~') |
217 | return NULL; | |
218 | path++; | |
219 | slash = strchr(path, '/'); | |
220 | if (path[0] == '/' || !path[0]) { | |
221 | pw = getpwuid(getuid()); | |
222 | } | |
223 | else { | |
224 | if (slash) { | |
225 | *slash = 0; | |
226 | pw = getpwnam(path); | |
227 | *slash = '/'; | |
54f4b874 | 228 | } |
d79374c7 JH |
229 | else |
230 | pw = getpwnam(path); | |
54f4b874 | 231 | } |
d79374c7 JH |
232 | if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir)) |
233 | return NULL; | |
234 | baselen = strlen(pw->pw_dir); | |
235 | memcpy(buf, pw->pw_dir, baselen); | |
236 | while ((1 < baselen) && (buf[baselen-1] == '/')) { | |
237 | buf[baselen-1] = 0; | |
238 | baselen--; | |
239 | } | |
240 | if (slash && slash[1]) { | |
241 | len = strlen(slash); | |
242 | if (sz <= baselen + len) | |
243 | return NULL; | |
244 | memcpy(buf + baselen, slash, len + 1); | |
245 | } | |
246 | return buf; | |
54f4b874 AE |
247 | } |
248 | ||
d79374c7 JH |
249 | /* |
250 | * First, one directory to try is determined by the following algorithm. | |
251 | * | |
252 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
253 | * done. Otherwise: | |
254 | * (1) "~/path" to mean path under the running user's home directory; | |
255 | * (2) "~user/path" to mean path under named user's home directory; | |
256 | * (3) "relative/path" to mean cwd relative directory; or | |
257 | * (4) "/absolute/path" to mean absolute directory. | |
258 | * | |
259 | * Unless "strict" is given, we try access() for existence of "%s.git/.git", | |
260 | * "%s/.git", "%s.git", "%s" in this order. The first one that exists is | |
261 | * what we try. | |
262 | * | |
263 | * Second, we try chdir() to that. Upon failure, we return NULL. | |
264 | * | |
265 | * Then, we try if the current directory is a valid git repository. | |
266 | * Upon failure, we return NULL. | |
267 | * | |
268 | * If all goes well, we return the directory we used to chdir() (but | |
269 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
270 | * links. User relative paths are also returned as they are given, | |
271 | * except DWIM suffixing. | |
272 | */ | |
54f4b874 AE |
273 | char *enter_repo(char *path, int strict) |
274 | { | |
d79374c7 JH |
275 | static char used_path[PATH_MAX]; |
276 | static char validated_path[PATH_MAX]; | |
277 | ||
278 | if (!path) | |
54f4b874 AE |
279 | return NULL; |
280 | ||
d79374c7 JH |
281 | if (!strict) { |
282 | static const char *suffix[] = { | |
283 | ".git/.git", "/.git", ".git", "", NULL, | |
284 | }; | |
285 | int len = strlen(path); | |
286 | int i; | |
287 | while ((1 < len) && (path[len-1] == '/')) { | |
288 | path[len-1] = 0; | |
289 | len--; | |
290 | } | |
291 | if (PATH_MAX <= len) | |
54f4b874 | 292 | return NULL; |
d79374c7 JH |
293 | if (path[0] == '~') { |
294 | if (!user_path(used_path, path, PATH_MAX)) | |
295 | return NULL; | |
296 | strcpy(validated_path, path); | |
297 | path = used_path; | |
298 | } | |
299 | else if (PATH_MAX - 10 < len) | |
300 | return NULL; | |
301 | else { | |
302 | path = strcpy(used_path, path); | |
303 | strcpy(validated_path, path); | |
304 | } | |
305 | len = strlen(path); | |
306 | for (i = 0; suffix[i]; i++) { | |
307 | strcpy(path + len, suffix[i]); | |
308 | if (!access(path, F_OK)) { | |
309 | strcat(validated_path, suffix[i]); | |
310 | break; | |
311 | } | |
312 | } | |
313 | if (!suffix[i] || chdir(path)) | |
0870ca7f | 314 | return NULL; |
d79374c7 | 315 | path = validated_path; |
0870ca7f | 316 | } |
d79374c7 JH |
317 | else if (chdir(path)) |
318 | return NULL; | |
54f4b874 | 319 | |
d79374c7 | 320 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && |
c847f537 | 321 | validate_headref("HEAD") == 0) { |
7627943a | 322 | setenv(GIT_DIR_ENVIRONMENT, ".", 1); |
1644162a | 323 | check_repository_format(); |
d79374c7 | 324 | return path; |
54f4b874 AE |
325 | } |
326 | ||
327 | return NULL; | |
328 | } | |
138086a7 | 329 | |
17e61b82 | 330 | int set_shared_perm(const char *path, int mode) |
138086a7 JH |
331 | { |
332 | struct stat st; | |
17e61b82 | 333 | int tweak, shared, orig_mode; |
138086a7 | 334 | |
17e61b82 JH |
335 | if (!shared_repository) { |
336 | if (mode) | |
337 | return chmod(path, mode & ~S_IFMT); | |
138086a7 | 338 | return 0; |
17e61b82 JH |
339 | } |
340 | if (!mode) { | |
341 | if (lstat(path, &st) < 0) | |
342 | return -1; | |
343 | mode = st.st_mode; | |
344 | orig_mode = mode; | |
345 | } else | |
346 | orig_mode = 0; | |
5a688fe4 JH |
347 | if (shared_repository < 0) |
348 | shared = -shared_repository; | |
349 | else | |
350 | shared = shared_repository; | |
351 | tweak = shared; | |
352 | ||
353 | if (!(mode & S_IWUSR)) | |
354 | tweak &= ~0222; | |
355 | if (mode & S_IXUSR) | |
356 | /* Copy read bits to execute bits */ | |
357 | tweak |= (tweak & 0444) >> 2; | |
358 | if (shared_repository < 0) | |
359 | mode = (mode & ~0777) | tweak; | |
360 | else | |
8c6202d8 | 361 | mode |= tweak; |
06cbe855 HO |
362 | |
363 | if (S_ISDIR(mode)) { | |
06cbe855 | 364 | /* Copy read bits to execute bits */ |
5a688fe4 JH |
365 | mode |= (shared & 0444) >> 2; |
366 | mode |= FORCE_DIR_SET_GID; | |
06cbe855 HO |
367 | } |
368 | ||
5a688fe4 | 369 | if (((shared_repository < 0 |
17e61b82 JH |
370 | ? (orig_mode & (FORCE_DIR_SET_GID | 0777)) |
371 | : (orig_mode & mode)) != mode) && | |
372 | chmod(path, (mode & ~S_IFMT)) < 0) | |
138086a7 JH |
373 | return -2; |
374 | return 0; | |
375 | } | |
e5392c51 | 376 | |
044bbbcb LT |
377 | const char *make_relative_path(const char *abs, const char *base) |
378 | { | |
379 | static char buf[PATH_MAX + 1]; | |
380 | int baselen; | |
381 | if (!base) | |
382 | return abs; | |
383 | baselen = strlen(base); | |
384 | if (prefixcmp(abs, base)) | |
385 | return abs; | |
386 | if (abs[baselen] == '/') | |
387 | baselen++; | |
388 | else if (base[baselen - 1] != '/') | |
389 | return abs; | |
390 | strcpy(buf, abs + baselen); | |
391 | return buf; | |
392 | } | |
ae299be0 DR |
393 | |
394 | /* | |
f2a782b8 | 395 | * It is okay if dst == src, but they should not overlap otherwise. |
ae299be0 | 396 | * |
f2a782b8 JS |
397 | * Performs the following normalizations on src, storing the result in dst: |
398 | * - Ensures that components are separated by '/' (Windows only) | |
399 | * - Squashes sequences of '/'. | |
ae299be0 DR |
400 | * - Removes "." components. |
401 | * - Removes ".." components, and the components the precede them. | |
f2a782b8 JS |
402 | * Returns failure (non-zero) if a ".." component appears as first path |
403 | * component anytime during the normalization. Otherwise, returns success (0). | |
ae299be0 DR |
404 | * |
405 | * Note that this function is purely textual. It does not follow symlinks, | |
406 | * verify the existence of the path, or make any system calls. | |
407 | */ | |
f3cad0ad | 408 | int normalize_path_copy(char *dst, const char *src) |
ae299be0 | 409 | { |
f3cad0ad | 410 | char *dst0; |
ae299be0 | 411 | |
f3cad0ad JS |
412 | if (has_dos_drive_prefix(src)) { |
413 | *dst++ = *src++; | |
414 | *dst++ = *src++; | |
ae299be0 | 415 | } |
f3cad0ad | 416 | dst0 = dst; |
ae299be0 | 417 | |
f3cad0ad | 418 | if (is_dir_sep(*src)) { |
ae299be0 | 419 | *dst++ = '/'; |
f3cad0ad JS |
420 | while (is_dir_sep(*src)) |
421 | src++; | |
422 | } | |
423 | ||
424 | for (;;) { | |
425 | char c = *src; | |
426 | ||
427 | /* | |
428 | * A path component that begins with . could be | |
429 | * special: | |
430 | * (1) "." and ends -- ignore and terminate. | |
431 | * (2) "./" -- ignore them, eat slash and continue. | |
432 | * (3) ".." and ends -- strip one and terminate. | |
433 | * (4) "../" -- strip one, eat slash and continue. | |
434 | */ | |
435 | if (c == '.') { | |
436 | if (!src[1]) { | |
437 | /* (1) */ | |
438 | src++; | |
439 | } else if (is_dir_sep(src[1])) { | |
440 | /* (2) */ | |
441 | src += 2; | |
442 | while (is_dir_sep(*src)) | |
443 | src++; | |
444 | continue; | |
445 | } else if (src[1] == '.') { | |
446 | if (!src[2]) { | |
447 | /* (3) */ | |
448 | src += 2; | |
449 | goto up_one; | |
450 | } else if (is_dir_sep(src[2])) { | |
451 | /* (4) */ | |
452 | src += 3; | |
453 | while (is_dir_sep(*src)) | |
454 | src++; | |
455 | goto up_one; | |
456 | } | |
457 | } | |
458 | } | |
ae299be0 | 459 | |
f3cad0ad JS |
460 | /* copy up to the next '/', and eat all '/' */ |
461 | while ((c = *src++) != '\0' && !is_dir_sep(c)) | |
462 | *dst++ = c; | |
463 | if (is_dir_sep(c)) { | |
464 | *dst++ = '/'; | |
465 | while (is_dir_sep(c)) | |
466 | c = *src++; | |
467 | src--; | |
468 | } else if (!c) | |
469 | break; | |
470 | continue; | |
471 | ||
472 | up_one: | |
473 | /* | |
474 | * dst0..dst is prefix portion, and dst[-1] is '/'; | |
475 | * go up one level. | |
476 | */ | |
f42302b4 JS |
477 | dst--; /* go to trailing '/' */ |
478 | if (dst <= dst0) | |
f3cad0ad | 479 | return -1; |
f42302b4 JS |
480 | /* Windows: dst[-1] cannot be backslash anymore */ |
481 | while (dst0 < dst && dst[-1] != '/') | |
482 | dst--; | |
f3cad0ad | 483 | } |
ae299be0 | 484 | *dst = '\0'; |
f3cad0ad | 485 | return 0; |
ae299be0 | 486 | } |
0454dd93 DR |
487 | |
488 | /* | |
489 | * path = Canonical absolute path | |
490 | * prefix_list = Colon-separated list of absolute paths | |
491 | * | |
2860b57a | 492 | * Determines, for each path in prefix_list, whether the "prefix" really |
0454dd93 DR |
493 | * is an ancestor directory of path. Returns the length of the longest |
494 | * ancestor directory, excluding any trailing slashes, or -1 if no prefix | |
495 | * is an ancestor. (Note that this means 0 is returned if prefix_list is | |
496 | * "/".) "/foo" is not considered an ancestor of "/foobar". Directories | |
497 | * are not considered to be their own ancestors. path must be in a | |
498 | * canonical form: empty components, or "." or ".." components are not | |
499 | * allowed. prefix_list may be null, which is like "". | |
500 | */ | |
501 | int longest_ancestor_length(const char *path, const char *prefix_list) | |
502 | { | |
503 | char buf[PATH_MAX+1]; | |
504 | const char *ceil, *colon; | |
505 | int len, max_len = -1; | |
506 | ||
507 | if (prefix_list == NULL || !strcmp(path, "/")) | |
508 | return -1; | |
509 | ||
510 | for (colon = ceil = prefix_list; *colon; ceil = colon+1) { | |
43a7ddb5 | 511 | for (colon = ceil; *colon && *colon != PATH_SEP; colon++); |
0454dd93 DR |
512 | len = colon - ceil; |
513 | if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil)) | |
514 | continue; | |
515 | strlcpy(buf, ceil, len+1); | |
43a7ddb5 RS |
516 | if (normalize_path_copy(buf, buf) < 0) |
517 | continue; | |
518 | len = strlen(buf); | |
519 | if (len > 0 && buf[len-1] == '/') | |
520 | buf[--len] = '\0'; | |
0454dd93 DR |
521 | |
522 | if (!strncmp(path, buf, len) && | |
523 | path[len] == '/' && | |
524 | len > max_len) { | |
525 | max_len = len; | |
526 | } | |
527 | } | |
528 | ||
529 | return max_len; | |
530 | } | |
4fcc86b0 JS |
531 | |
532 | /* strip arbitrary amount of directory separators at end of path */ | |
533 | static inline int chomp_trailing_dir_sep(const char *path, int len) | |
534 | { | |
535 | while (len && is_dir_sep(path[len - 1])) | |
536 | len--; | |
537 | return len; | |
538 | } | |
539 | ||
540 | /* | |
541 | * If path ends with suffix (complete path components), returns the | |
542 | * part before suffix (sans trailing directory separators). | |
543 | * Otherwise returns NULL. | |
544 | */ | |
545 | char *strip_path_suffix(const char *path, const char *suffix) | |
546 | { | |
547 | int path_len = strlen(path), suffix_len = strlen(suffix); | |
548 | ||
549 | while (suffix_len) { | |
550 | if (!path_len) | |
551 | return NULL; | |
552 | ||
553 | if (is_dir_sep(path[path_len - 1])) { | |
554 | if (!is_dir_sep(suffix[suffix_len - 1])) | |
555 | return NULL; | |
556 | path_len = chomp_trailing_dir_sep(path, path_len); | |
557 | suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); | |
558 | } | |
559 | else if (path[--path_len] != suffix[--suffix_len]) | |
560 | return NULL; | |
561 | } | |
562 | ||
563 | if (path_len && !is_dir_sep(path[path_len - 1])) | |
564 | return NULL; | |
565 | return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); | |
566 | } |