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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" | |
395de250 | 14 | #include "strbuf.h" |
26c8a533 | 15 | |
26c8a533 LT |
16 | static char bad_path[] = "/bad-path/"; |
17 | ||
e7676d2f LT |
18 | static char *get_pathname(void) |
19 | { | |
20 | static char pathname_array[4][PATH_MAX]; | |
21 | static int index; | |
22 | return pathname_array[3 & ++index]; | |
23 | } | |
24 | ||
26c8a533 LT |
25 | static char *cleanup_path(char *path) |
26 | { | |
27 | /* Clean it up */ | |
28 | if (!memcmp(path, "./", 2)) { | |
29 | path += 2; | |
30 | while (*path == '/') | |
31 | path++; | |
32 | } | |
33 | return path; | |
34 | } | |
35 | ||
108bebea AR |
36 | char *mksnpath(char *buf, size_t n, const char *fmt, ...) |
37 | { | |
38 | va_list args; | |
39 | unsigned len; | |
40 | ||
41 | va_start(args, fmt); | |
42 | len = vsnprintf(buf, n, fmt, args); | |
43 | va_end(args); | |
44 | if (len >= n) { | |
9db56f71 | 45 | strlcpy(buf, bad_path, n); |
108bebea AR |
46 | return buf; |
47 | } | |
48 | return cleanup_path(buf); | |
49 | } | |
50 | ||
5b3b8fa2 | 51 | static char *vsnpath(char *buf, size_t n, const char *fmt, va_list args) |
fe2d7776 AR |
52 | { |
53 | const char *git_dir = get_git_dir(); | |
fe2d7776 AR |
54 | size_t len; |
55 | ||
56 | len = strlen(git_dir); | |
57 | if (n < len + 1) | |
58 | goto bad; | |
59 | memcpy(buf, git_dir, len); | |
60 | if (len && !is_dir_sep(git_dir[len-1])) | |
61 | buf[len++] = '/'; | |
fe2d7776 | 62 | len += vsnprintf(buf + len, n - len, fmt, args); |
fe2d7776 AR |
63 | if (len >= n) |
64 | goto bad; | |
65 | return cleanup_path(buf); | |
66 | bad: | |
9db56f71 | 67 | strlcpy(buf, bad_path, n); |
fe2d7776 AR |
68 | return buf; |
69 | } | |
70 | ||
aba13e7c AR |
71 | char *git_snpath(char *buf, size_t n, const char *fmt, ...) |
72 | { | |
66a51a9a | 73 | char *ret; |
aba13e7c AR |
74 | va_list args; |
75 | va_start(args, fmt); | |
66a51a9a | 76 | ret = vsnpath(buf, n, fmt, args); |
aba13e7c | 77 | va_end(args); |
66a51a9a | 78 | return ret; |
aba13e7c AR |
79 | } |
80 | ||
81 | char *git_pathdup(const char *fmt, ...) | |
82 | { | |
66a51a9a | 83 | char path[PATH_MAX], *ret; |
aba13e7c AR |
84 | va_list args; |
85 | va_start(args, fmt); | |
66a51a9a | 86 | ret = vsnpath(path, sizeof(path), fmt, args); |
aba13e7c | 87 | va_end(args); |
66a51a9a | 88 | return xstrdup(ret); |
aba13e7c AR |
89 | } |
90 | ||
21cf3227 HKNN |
91 | char *mkpathdup(const char *fmt, ...) |
92 | { | |
93 | char *path; | |
94 | struct strbuf sb = STRBUF_INIT; | |
95 | va_list args; | |
96 | ||
97 | va_start(args, fmt); | |
98 | strbuf_vaddf(&sb, fmt, args); | |
99 | va_end(args); | |
100 | path = xstrdup(cleanup_path(sb.buf)); | |
101 | ||
102 | strbuf_release(&sb); | |
103 | return path; | |
104 | } | |
105 | ||
26c8a533 LT |
106 | char *mkpath(const char *fmt, ...) |
107 | { | |
108 | va_list args; | |
109 | unsigned len; | |
e7676d2f | 110 | char *pathname = get_pathname(); |
26c8a533 LT |
111 | |
112 | va_start(args, fmt); | |
113 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
114 | va_end(args); | |
115 | if (len >= PATH_MAX) | |
116 | return bad_path; | |
117 | return cleanup_path(pathname); | |
118 | } | |
119 | ||
120 | char *git_path(const char *fmt, ...) | |
121 | { | |
e7676d2f | 122 | char *pathname = get_pathname(); |
26c8a533 | 123 | va_list args; |
5c44252e | 124 | char *ret; |
26c8a533 | 125 | |
26c8a533 | 126 | va_start(args, fmt); |
5c44252e | 127 | ret = vsnpath(pathname, PATH_MAX, fmt, args); |
26c8a533 | 128 | va_end(args); |
5c44252e | 129 | return ret; |
26c8a533 | 130 | } |
f2db68ed | 131 | |
21cf3227 HKNN |
132 | void home_config_paths(char **global, char **xdg, char *file) |
133 | { | |
134 | char *xdg_home = getenv("XDG_CONFIG_HOME"); | |
135 | char *home = getenv("HOME"); | |
136 | char *to_free = NULL; | |
137 | ||
138 | if (!home) { | |
139 | if (global) | |
140 | *global = NULL; | |
141 | } else { | |
142 | if (!xdg_home) { | |
143 | to_free = mkpathdup("%s/.config", home); | |
144 | xdg_home = to_free; | |
145 | } | |
146 | if (global) | |
147 | *global = mkpathdup("%s/.gitconfig", home); | |
148 | } | |
149 | ||
150 | if (!xdg_home) | |
151 | *xdg = NULL; | |
152 | else | |
153 | *xdg = mkpathdup("%s/git/%s", xdg_home, file); | |
154 | ||
155 | free(to_free); | |
156 | } | |
157 | ||
0bad611b HV |
158 | char *git_path_submodule(const char *path, const char *fmt, ...) |
159 | { | |
160 | char *pathname = get_pathname(); | |
161 | struct strbuf buf = STRBUF_INIT; | |
162 | const char *git_dir; | |
163 | va_list args; | |
164 | unsigned len; | |
165 | ||
166 | len = strlen(path); | |
167 | if (len > PATH_MAX-100) | |
168 | return bad_path; | |
169 | ||
170 | strbuf_addstr(&buf, path); | |
171 | if (len && path[len-1] != '/') | |
172 | strbuf_addch(&buf, '/'); | |
173 | strbuf_addstr(&buf, ".git"); | |
174 | ||
13d6ec91 | 175 | git_dir = read_gitfile(buf.buf); |
0bad611b HV |
176 | if (git_dir) { |
177 | strbuf_reset(&buf); | |
178 | strbuf_addstr(&buf, git_dir); | |
179 | } | |
180 | strbuf_addch(&buf, '/'); | |
181 | ||
182 | if (buf.len >= PATH_MAX) | |
183 | return bad_path; | |
184 | memcpy(pathname, buf.buf, buf.len + 1); | |
185 | ||
186 | strbuf_release(&buf); | |
187 | len = strlen(pathname); | |
188 | ||
189 | va_start(args, fmt); | |
190 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); | |
191 | va_end(args); | |
192 | if (len >= PATH_MAX) | |
193 | return bad_path; | |
194 | return cleanup_path(pathname); | |
195 | } | |
f2db68ed | 196 | |
c847f537 | 197 | int validate_headref(const char *path) |
0870ca7f JH |
198 | { |
199 | struct stat st; | |
200 | char *buf, buffer[256]; | |
c847f537 | 201 | unsigned char sha1[20]; |
0104ca09 HO |
202 | int fd; |
203 | ssize_t len; | |
0870ca7f JH |
204 | |
205 | if (lstat(path, &st) < 0) | |
206 | return -1; | |
207 | ||
208 | /* Make sure it is a "refs/.." symlink */ | |
209 | if (S_ISLNK(st.st_mode)) { | |
210 | len = readlink(path, buffer, sizeof(buffer)-1); | |
222b1673 | 211 | if (len >= 5 && !memcmp("refs/", buffer, 5)) |
0870ca7f JH |
212 | return 0; |
213 | return -1; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Anything else, just open it and try to see if it is a symbolic ref. | |
218 | */ | |
219 | fd = open(path, O_RDONLY); | |
220 | if (fd < 0) | |
221 | return -1; | |
93d26e4c | 222 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
0870ca7f JH |
223 | close(fd); |
224 | ||
225 | /* | |
226 | * Is it a symbolic ref? | |
227 | */ | |
c847f537 | 228 | if (len < 4) |
0870ca7f | 229 | return -1; |
c847f537 JH |
230 | if (!memcmp("ref:", buffer, 4)) { |
231 | buf = buffer + 4; | |
232 | len -= 4; | |
233 | while (len && isspace(*buf)) | |
234 | buf++, len--; | |
222b1673 | 235 | if (len >= 5 && !memcmp("refs/", buf, 5)) |
c847f537 JH |
236 | return 0; |
237 | } | |
238 | ||
239 | /* | |
240 | * Is this a detached HEAD? | |
241 | */ | |
242 | if (!get_sha1_hex(buffer, sha1)) | |
0870ca7f | 243 | return 0; |
c847f537 | 244 | |
0870ca7f JH |
245 | return -1; |
246 | } | |
247 | ||
395de250 | 248 | static struct passwd *getpw_str(const char *username, size_t len) |
54f4b874 | 249 | { |
d79374c7 | 250 | struct passwd *pw; |
395de250 MM |
251 | char *username_z = xmalloc(len + 1); |
252 | memcpy(username_z, username, len); | |
253 | username_z[len] = '\0'; | |
254 | pw = getpwnam(username_z); | |
255 | free(username_z); | |
256 | return pw; | |
257 | } | |
54f4b874 | 258 | |
395de250 MM |
259 | /* |
260 | * Return a string with ~ and ~user expanded via getpw*. If buf != NULL, | |
261 | * then it is a newly allocated string. Returns NULL on getpw failure or | |
262 | * if path is NULL. | |
263 | */ | |
264 | char *expand_user_path(const char *path) | |
265 | { | |
266 | struct strbuf user_path = STRBUF_INIT; | |
267 | const char *first_slash = strchrnul(path, '/'); | |
268 | const char *to_copy = path; | |
269 | ||
270 | if (path == NULL) | |
271 | goto return_null; | |
272 | if (path[0] == '~') { | |
273 | const char *username = path + 1; | |
274 | size_t username_len = first_slash - username; | |
df2a79f4 MM |
275 | if (username_len == 0) { |
276 | const char *home = getenv("HOME"); | |
79bf1490 JN |
277 | if (!home) |
278 | goto return_null; | |
df2a79f4 MM |
279 | strbuf_add(&user_path, home, strlen(home)); |
280 | } else { | |
281 | struct passwd *pw = getpw_str(username, username_len); | |
282 | if (!pw) | |
283 | goto return_null; | |
284 | strbuf_add(&user_path, pw->pw_dir, strlen(pw->pw_dir)); | |
54f4b874 | 285 | } |
395de250 | 286 | to_copy = first_slash; |
d79374c7 | 287 | } |
395de250 MM |
288 | strbuf_add(&user_path, to_copy, strlen(to_copy)); |
289 | return strbuf_detach(&user_path, NULL); | |
290 | return_null: | |
291 | strbuf_release(&user_path); | |
292 | return NULL; | |
54f4b874 AE |
293 | } |
294 | ||
d79374c7 JH |
295 | /* |
296 | * First, one directory to try is determined by the following algorithm. | |
297 | * | |
298 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
299 | * done. Otherwise: | |
300 | * (1) "~/path" to mean path under the running user's home directory; | |
301 | * (2) "~user/path" to mean path under named user's home directory; | |
302 | * (3) "relative/path" to mean cwd relative directory; or | |
303 | * (4) "/absolute/path" to mean absolute directory. | |
304 | * | |
305 | * Unless "strict" is given, we try access() for existence of "%s.git/.git", | |
306 | * "%s/.git", "%s.git", "%s" in this order. The first one that exists is | |
307 | * what we try. | |
308 | * | |
309 | * Second, we try chdir() to that. Upon failure, we return NULL. | |
310 | * | |
311 | * Then, we try if the current directory is a valid git repository. | |
312 | * Upon failure, we return NULL. | |
313 | * | |
314 | * If all goes well, we return the directory we used to chdir() (but | |
315 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
316 | * links. User relative paths are also returned as they are given, | |
317 | * except DWIM suffixing. | |
318 | */ | |
1c64b48e | 319 | const char *enter_repo(const char *path, int strict) |
54f4b874 | 320 | { |
d79374c7 JH |
321 | static char used_path[PATH_MAX]; |
322 | static char validated_path[PATH_MAX]; | |
323 | ||
324 | if (!path) | |
54f4b874 AE |
325 | return NULL; |
326 | ||
d79374c7 JH |
327 | if (!strict) { |
328 | static const char *suffix[] = { | |
b3256eb8 | 329 | "/.git", "", ".git/.git", ".git", NULL, |
d79374c7 | 330 | }; |
03106768 | 331 | const char *gitfile; |
d79374c7 JH |
332 | int len = strlen(path); |
333 | int i; | |
1c64b48e | 334 | while ((1 < len) && (path[len-1] == '/')) |
d79374c7 | 335 | len--; |
1c64b48e | 336 | |
d79374c7 | 337 | if (PATH_MAX <= len) |
54f4b874 | 338 | return NULL; |
1c64b48e EFL |
339 | strncpy(used_path, path, len); used_path[len] = 0 ; |
340 | strcpy(validated_path, used_path); | |
341 | ||
342 | if (used_path[0] == '~') { | |
343 | char *newpath = expand_user_path(used_path); | |
395de250 MM |
344 | if (!newpath || (PATH_MAX - 10 < strlen(newpath))) { |
345 | free(newpath); | |
d79374c7 | 346 | return NULL; |
395de250 MM |
347 | } |
348 | /* | |
349 | * Copy back into the static buffer. A pity | |
350 | * since newpath was not bounded, but other | |
351 | * branches of the if are limited by PATH_MAX | |
352 | * anyway. | |
353 | */ | |
354 | strcpy(used_path, newpath); free(newpath); | |
d79374c7 JH |
355 | } |
356 | else if (PATH_MAX - 10 < len) | |
357 | return NULL; | |
1c64b48e | 358 | len = strlen(used_path); |
d79374c7 | 359 | for (i = 0; suffix[i]; i++) { |
b3256eb8 | 360 | struct stat st; |
1c64b48e | 361 | strcpy(used_path + len, suffix[i]); |
b3256eb8 JK |
362 | if (!stat(used_path, &st) && |
363 | (S_ISREG(st.st_mode) || | |
364 | (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) { | |
d79374c7 JH |
365 | strcat(validated_path, suffix[i]); |
366 | break; | |
367 | } | |
368 | } | |
03106768 PH |
369 | if (!suffix[i]) |
370 | return NULL; | |
371 | gitfile = read_gitfile(used_path) ; | |
372 | if (gitfile) | |
373 | strcpy(used_path, gitfile); | |
374 | if (chdir(used_path)) | |
0870ca7f | 375 | return NULL; |
d79374c7 | 376 | path = validated_path; |
0870ca7f | 377 | } |
d79374c7 JH |
378 | else if (chdir(path)) |
379 | return NULL; | |
54f4b874 | 380 | |
d79374c7 | 381 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && |
c847f537 | 382 | validate_headref("HEAD") == 0) { |
717c3972 | 383 | set_git_dir("."); |
1644162a | 384 | check_repository_format(); |
d79374c7 | 385 | return path; |
54f4b874 AE |
386 | } |
387 | ||
388 | return NULL; | |
389 | } | |
138086a7 | 390 | |
17e61b82 | 391 | int set_shared_perm(const char *path, int mode) |
138086a7 JH |
392 | { |
393 | struct stat st; | |
17e61b82 | 394 | int tweak, shared, orig_mode; |
138086a7 | 395 | |
17e61b82 JH |
396 | if (!shared_repository) { |
397 | if (mode) | |
398 | return chmod(path, mode & ~S_IFMT); | |
138086a7 | 399 | return 0; |
17e61b82 JH |
400 | } |
401 | if (!mode) { | |
402 | if (lstat(path, &st) < 0) | |
403 | return -1; | |
404 | mode = st.st_mode; | |
405 | orig_mode = mode; | |
406 | } else | |
407 | orig_mode = 0; | |
5a688fe4 JH |
408 | if (shared_repository < 0) |
409 | shared = -shared_repository; | |
410 | else | |
411 | shared = shared_repository; | |
412 | tweak = shared; | |
413 | ||
414 | if (!(mode & S_IWUSR)) | |
415 | tweak &= ~0222; | |
416 | if (mode & S_IXUSR) | |
417 | /* Copy read bits to execute bits */ | |
418 | tweak |= (tweak & 0444) >> 2; | |
419 | if (shared_repository < 0) | |
420 | mode = (mode & ~0777) | tweak; | |
421 | else | |
8c6202d8 | 422 | mode |= tweak; |
06cbe855 HO |
423 | |
424 | if (S_ISDIR(mode)) { | |
06cbe855 | 425 | /* Copy read bits to execute bits */ |
5a688fe4 JH |
426 | mode |= (shared & 0444) >> 2; |
427 | mode |= FORCE_DIR_SET_GID; | |
06cbe855 HO |
428 | } |
429 | ||
5a688fe4 | 430 | if (((shared_repository < 0 |
17e61b82 JH |
431 | ? (orig_mode & (FORCE_DIR_SET_GID | 0777)) |
432 | : (orig_mode & mode)) != mode) && | |
433 | chmod(path, (mode & ~S_IFMT)) < 0) | |
138086a7 JH |
434 | return -2; |
435 | return 0; | |
436 | } | |
e5392c51 | 437 | |
e2a57aac | 438 | const char *relative_path(const char *abs, const char *base) |
044bbbcb LT |
439 | { |
440 | static char buf[PATH_MAX + 1]; | |
288123f0 JH |
441 | int i = 0, j = 0; |
442 | ||
443 | if (!base || !base[0]) | |
044bbbcb | 444 | return abs; |
288123f0 JH |
445 | while (base[i]) { |
446 | if (is_dir_sep(base[i])) { | |
447 | if (!is_dir_sep(abs[j])) | |
448 | return abs; | |
449 | while (is_dir_sep(base[i])) | |
450 | i++; | |
451 | while (is_dir_sep(abs[j])) | |
452 | j++; | |
453 | continue; | |
454 | } else if (abs[j] != base[i]) { | |
455 | return abs; | |
456 | } | |
457 | i++; | |
458 | j++; | |
459 | } | |
460 | if ( | |
461 | /* "/foo" is a prefix of "/foo" */ | |
462 | abs[j] && | |
463 | /* "/foo" is not a prefix of "/foobar" */ | |
464 | !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j]) | |
465 | ) | |
044bbbcb | 466 | return abs; |
288123f0 JH |
467 | while (is_dir_sep(abs[j])) |
468 | j++; | |
469 | if (!abs[j]) | |
470 | strcpy(buf, "."); | |
471 | else | |
472 | strcpy(buf, abs + j); | |
044bbbcb LT |
473 | return buf; |
474 | } | |
ae299be0 DR |
475 | |
476 | /* | |
f2a782b8 | 477 | * It is okay if dst == src, but they should not overlap otherwise. |
ae299be0 | 478 | * |
f2a782b8 JS |
479 | * Performs the following normalizations on src, storing the result in dst: |
480 | * - Ensures that components are separated by '/' (Windows only) | |
481 | * - Squashes sequences of '/'. | |
ae299be0 DR |
482 | * - Removes "." components. |
483 | * - Removes ".." components, and the components the precede them. | |
f2a782b8 JS |
484 | * Returns failure (non-zero) if a ".." component appears as first path |
485 | * component anytime during the normalization. Otherwise, returns success (0). | |
ae299be0 DR |
486 | * |
487 | * Note that this function is purely textual. It does not follow symlinks, | |
488 | * verify the existence of the path, or make any system calls. | |
489 | */ | |
f3cad0ad | 490 | int normalize_path_copy(char *dst, const char *src) |
ae299be0 | 491 | { |
f3cad0ad | 492 | char *dst0; |
ae299be0 | 493 | |
f3cad0ad JS |
494 | if (has_dos_drive_prefix(src)) { |
495 | *dst++ = *src++; | |
496 | *dst++ = *src++; | |
ae299be0 | 497 | } |
f3cad0ad | 498 | dst0 = dst; |
ae299be0 | 499 | |
f3cad0ad | 500 | if (is_dir_sep(*src)) { |
ae299be0 | 501 | *dst++ = '/'; |
f3cad0ad JS |
502 | while (is_dir_sep(*src)) |
503 | src++; | |
504 | } | |
505 | ||
506 | for (;;) { | |
507 | char c = *src; | |
508 | ||
509 | /* | |
510 | * A path component that begins with . could be | |
511 | * special: | |
512 | * (1) "." and ends -- ignore and terminate. | |
513 | * (2) "./" -- ignore them, eat slash and continue. | |
514 | * (3) ".." and ends -- strip one and terminate. | |
515 | * (4) "../" -- strip one, eat slash and continue. | |
516 | */ | |
517 | if (c == '.') { | |
518 | if (!src[1]) { | |
519 | /* (1) */ | |
520 | src++; | |
521 | } else if (is_dir_sep(src[1])) { | |
522 | /* (2) */ | |
523 | src += 2; | |
524 | while (is_dir_sep(*src)) | |
525 | src++; | |
526 | continue; | |
527 | } else if (src[1] == '.') { | |
528 | if (!src[2]) { | |
529 | /* (3) */ | |
530 | src += 2; | |
531 | goto up_one; | |
532 | } else if (is_dir_sep(src[2])) { | |
533 | /* (4) */ | |
534 | src += 3; | |
535 | while (is_dir_sep(*src)) | |
536 | src++; | |
537 | goto up_one; | |
538 | } | |
539 | } | |
540 | } | |
ae299be0 | 541 | |
f3cad0ad JS |
542 | /* copy up to the next '/', and eat all '/' */ |
543 | while ((c = *src++) != '\0' && !is_dir_sep(c)) | |
544 | *dst++ = c; | |
545 | if (is_dir_sep(c)) { | |
546 | *dst++ = '/'; | |
547 | while (is_dir_sep(c)) | |
548 | c = *src++; | |
549 | src--; | |
550 | } else if (!c) | |
551 | break; | |
552 | continue; | |
553 | ||
554 | up_one: | |
555 | /* | |
556 | * dst0..dst is prefix portion, and dst[-1] is '/'; | |
557 | * go up one level. | |
558 | */ | |
f42302b4 JS |
559 | dst--; /* go to trailing '/' */ |
560 | if (dst <= dst0) | |
f3cad0ad | 561 | return -1; |
f42302b4 JS |
562 | /* Windows: dst[-1] cannot be backslash anymore */ |
563 | while (dst0 < dst && dst[-1] != '/') | |
564 | dst--; | |
f3cad0ad | 565 | } |
ae299be0 | 566 | *dst = '\0'; |
f3cad0ad | 567 | return 0; |
ae299be0 | 568 | } |
0454dd93 DR |
569 | |
570 | /* | |
571 | * path = Canonical absolute path | |
572 | * prefix_list = Colon-separated list of absolute paths | |
573 | * | |
2860b57a | 574 | * Determines, for each path in prefix_list, whether the "prefix" really |
0454dd93 DR |
575 | * is an ancestor directory of path. Returns the length of the longest |
576 | * ancestor directory, excluding any trailing slashes, or -1 if no prefix | |
577 | * is an ancestor. (Note that this means 0 is returned if prefix_list is | |
578 | * "/".) "/foo" is not considered an ancestor of "/foobar". Directories | |
579 | * are not considered to be their own ancestors. path must be in a | |
580 | * canonical form: empty components, or "." or ".." components are not | |
581 | * allowed. prefix_list may be null, which is like "". | |
582 | */ | |
583 | int longest_ancestor_length(const char *path, const char *prefix_list) | |
584 | { | |
585 | char buf[PATH_MAX+1]; | |
586 | const char *ceil, *colon; | |
587 | int len, max_len = -1; | |
588 | ||
589 | if (prefix_list == NULL || !strcmp(path, "/")) | |
590 | return -1; | |
591 | ||
592 | for (colon = ceil = prefix_list; *colon; ceil = colon+1) { | |
43a7ddb5 | 593 | for (colon = ceil; *colon && *colon != PATH_SEP; colon++); |
0454dd93 DR |
594 | len = colon - ceil; |
595 | if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil)) | |
596 | continue; | |
597 | strlcpy(buf, ceil, len+1); | |
43a7ddb5 RS |
598 | if (normalize_path_copy(buf, buf) < 0) |
599 | continue; | |
600 | len = strlen(buf); | |
601 | if (len > 0 && buf[len-1] == '/') | |
602 | buf[--len] = '\0'; | |
0454dd93 DR |
603 | |
604 | if (!strncmp(path, buf, len) && | |
605 | path[len] == '/' && | |
606 | len > max_len) { | |
607 | max_len = len; | |
608 | } | |
609 | } | |
610 | ||
611 | return max_len; | |
612 | } | |
4fcc86b0 JS |
613 | |
614 | /* strip arbitrary amount of directory separators at end of path */ | |
615 | static inline int chomp_trailing_dir_sep(const char *path, int len) | |
616 | { | |
617 | while (len && is_dir_sep(path[len - 1])) | |
618 | len--; | |
619 | return len; | |
620 | } | |
621 | ||
622 | /* | |
623 | * If path ends with suffix (complete path components), returns the | |
624 | * part before suffix (sans trailing directory separators). | |
625 | * Otherwise returns NULL. | |
626 | */ | |
627 | char *strip_path_suffix(const char *path, const char *suffix) | |
628 | { | |
629 | int path_len = strlen(path), suffix_len = strlen(suffix); | |
630 | ||
631 | while (suffix_len) { | |
632 | if (!path_len) | |
633 | return NULL; | |
634 | ||
635 | if (is_dir_sep(path[path_len - 1])) { | |
636 | if (!is_dir_sep(suffix[suffix_len - 1])) | |
637 | return NULL; | |
638 | path_len = chomp_trailing_dir_sep(path, path_len); | |
639 | suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); | |
640 | } | |
641 | else if (path[--path_len] != suffix[--suffix_len]) | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | if (path_len && !is_dir_sep(path[path_len - 1])) | |
646 | return NULL; | |
647 | return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); | |
648 | } | |
34b6cb8b SP |
649 | |
650 | int daemon_avoid_alias(const char *p) | |
651 | { | |
652 | int sl, ndot; | |
653 | ||
654 | /* | |
655 | * This resurrects the belts and suspenders paranoia check by HPA | |
656 | * done in <435560F7.4080006@zytor.com> thread, now enter_repo() | |
9517e6b8 | 657 | * does not do getcwd() based path canonicalization. |
34b6cb8b SP |
658 | * |
659 | * sl becomes true immediately after seeing '/' and continues to | |
660 | * be true as long as dots continue after that without intervening | |
661 | * non-dot character. | |
662 | */ | |
663 | if (!p || (*p != '/' && *p != '~')) | |
664 | return -1; | |
665 | sl = 1; ndot = 0; | |
666 | p++; | |
667 | ||
668 | while (1) { | |
669 | char ch = *p++; | |
670 | if (sl) { | |
671 | if (ch == '.') | |
672 | ndot++; | |
673 | else if (ch == '/') { | |
674 | if (ndot < 3) | |
675 | /* reject //, /./ and /../ */ | |
676 | return -1; | |
677 | ndot = 0; | |
678 | } | |
679 | else if (ch == 0) { | |
680 | if (0 < ndot && ndot < 3) | |
681 | /* reject /.$ and /..$ */ | |
682 | return -1; | |
683 | return 0; | |
684 | } | |
685 | else | |
686 | sl = ndot = 0; | |
687 | } | |
688 | else if (ch == 0) | |
689 | return 0; | |
690 | else if (ch == '/') { | |
691 | sl = 1; | |
692 | ndot = 0; | |
693 | } | |
694 | } | |
695 | } | |
4bb43de2 NTND |
696 | |
697 | int offset_1st_component(const char *path) | |
698 | { | |
699 | if (has_dos_drive_prefix(path)) | |
700 | return 2 + is_dir_sep(path[2]); | |
701 | return is_dir_sep(path[0]); | |
702 | } |