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Commit | Line | Data |
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1 | /* | |
2 | * Utilities for paths and pathnames | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "strbuf.h" | |
6 | #include "string-list.h" | |
7 | #include "dir.h" | |
8 | ||
9 | static int get_st_mode_bits(const char *path, int *mode) | |
10 | { | |
11 | struct stat st; | |
12 | if (lstat(path, &st) < 0) | |
13 | return -1; | |
14 | *mode = st.st_mode; | |
15 | return 0; | |
16 | } | |
17 | ||
18 | static char bad_path[] = "/bad-path/"; | |
19 | ||
20 | static struct strbuf *get_pathname(void) | |
21 | { | |
22 | static struct strbuf pathname_array[4] = { | |
23 | STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT | |
24 | }; | |
25 | static int index; | |
26 | struct strbuf *sb = &pathname_array[3 & ++index]; | |
27 | strbuf_reset(sb); | |
28 | return sb; | |
29 | } | |
30 | ||
31 | static char *cleanup_path(char *path) | |
32 | { | |
33 | /* Clean it up */ | |
34 | if (!memcmp(path, "./", 2)) { | |
35 | path += 2; | |
36 | while (*path == '/') | |
37 | path++; | |
38 | } | |
39 | return path; | |
40 | } | |
41 | ||
42 | static void strbuf_cleanup_path(struct strbuf *sb) | |
43 | { | |
44 | char *path = cleanup_path(sb->buf); | |
45 | if (path > sb->buf) | |
46 | strbuf_remove(sb, 0, path - sb->buf); | |
47 | } | |
48 | ||
49 | char *mksnpath(char *buf, size_t n, const char *fmt, ...) | |
50 | { | |
51 | va_list args; | |
52 | unsigned len; | |
53 | ||
54 | va_start(args, fmt); | |
55 | len = vsnprintf(buf, n, fmt, args); | |
56 | va_end(args); | |
57 | if (len >= n) { | |
58 | strlcpy(buf, bad_path, n); | |
59 | return buf; | |
60 | } | |
61 | return cleanup_path(buf); | |
62 | } | |
63 | ||
64 | static int dir_prefix(const char *buf, const char *dir) | |
65 | { | |
66 | int len = strlen(dir); | |
67 | return !strncmp(buf, dir, len) && | |
68 | (is_dir_sep(buf[len]) || buf[len] == '\0'); | |
69 | } | |
70 | ||
71 | /* $buf =~ m|$dir/+$file| but without regex */ | |
72 | static int is_dir_file(const char *buf, const char *dir, const char *file) | |
73 | { | |
74 | int len = strlen(dir); | |
75 | if (strncmp(buf, dir, len) || !is_dir_sep(buf[len])) | |
76 | return 0; | |
77 | while (is_dir_sep(buf[len])) | |
78 | len++; | |
79 | return !strcmp(buf + len, file); | |
80 | } | |
81 | ||
82 | static void replace_dir(struct strbuf *buf, int len, const char *newdir) | |
83 | { | |
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]); | |
87 | if (need_sep) | |
88 | len--; /* keep one char, to be replaced with '/' */ | |
89 | strbuf_splice(buf, 0, len, newdir, newlen); | |
90 | if (need_sep) | |
91 | buf->buf[newlen] = '/'; | |
92 | } | |
93 | ||
94 | struct common_dir { | |
95 | /* Not considered garbage for report_linked_checkout_garbage */ | |
96 | unsigned ignore_garbage:1; | |
97 | unsigned is_dir:1; | |
98 | /* Not common even though its parent is */ | |
99 | unsigned exclude:1; | |
100 | const char *dirname; | |
101 | }; | |
102 | ||
103 | static struct common_dir common_list[] = { | |
104 | { 0, 1, 0, "branches" }, | |
105 | { 0, 1, 0, "hooks" }, | |
106 | { 0, 1, 0, "info" }, | |
107 | { 0, 0, 1, "info/sparse-checkout" }, | |
108 | { 1, 1, 0, "logs" }, | |
109 | { 1, 1, 1, "logs/HEAD" }, | |
110 | { 0, 1, 0, "lost-found" }, | |
111 | { 0, 1, 0, "objects" }, | |
112 | { 0, 1, 0, "refs" }, | |
113 | { 0, 1, 0, "remotes" }, | |
114 | { 0, 1, 0, "worktrees" }, | |
115 | { 0, 1, 0, "rr-cache" }, | |
116 | { 0, 1, 0, "svn" }, | |
117 | { 0, 0, 0, "config" }, | |
118 | { 1, 0, 0, "gc.pid" }, | |
119 | { 0, 0, 0, "packed-refs" }, | |
120 | { 0, 0, 0, "shallow" }, | |
121 | { 0, 0, 0, NULL } | |
122 | }; | |
123 | ||
124 | static void update_common_dir(struct strbuf *buf, int git_dir_len) | |
125 | { | |
126 | char *base = buf->buf + git_dir_len; | |
127 | const struct common_dir *p; | |
128 | ||
129 | if (is_dir_file(base, "logs", "HEAD") || | |
130 | is_dir_file(base, "info", "sparse-checkout")) | |
131 | return; /* keep this in $GIT_DIR */ | |
132 | for (p = common_list; p->dirname; p++) { | |
133 | const char *path = p->dirname; | |
134 | if (p->is_dir && dir_prefix(base, path)) { | |
135 | replace_dir(buf, git_dir_len, get_git_common_dir()); | |
136 | return; | |
137 | } | |
138 | if (!p->is_dir && !strcmp(base, path)) { | |
139 | replace_dir(buf, git_dir_len, get_git_common_dir()); | |
140 | return; | |
141 | } | |
142 | } | |
143 | } | |
144 | ||
145 | void report_linked_checkout_garbage(void) | |
146 | { | |
147 | struct strbuf sb = STRBUF_INIT; | |
148 | const struct common_dir *p; | |
149 | int len; | |
150 | ||
151 | if (!git_common_dir_env) | |
152 | return; | |
153 | strbuf_addf(&sb, "%s/", get_git_dir()); | |
154 | len = sb.len; | |
155 | for (p = common_list; p->dirname; p++) { | |
156 | const char *path = p->dirname; | |
157 | if (p->ignore_garbage) | |
158 | continue; | |
159 | strbuf_setlen(&sb, len); | |
160 | strbuf_addstr(&sb, path); | |
161 | if (file_exists(sb.buf)) | |
162 | report_garbage("unused in linked checkout", sb.buf); | |
163 | } | |
164 | strbuf_release(&sb); | |
165 | } | |
166 | ||
167 | static void adjust_git_path(struct strbuf *buf, int git_dir_len) | |
168 | { | |
169 | const char *base = buf->buf + git_dir_len; | |
170 | if (git_graft_env && is_dir_file(base, "info", "grafts")) | |
171 | strbuf_splice(buf, 0, buf->len, | |
172 | get_graft_file(), strlen(get_graft_file())); | |
173 | else if (git_index_env && !strcmp(base, "index")) | |
174 | strbuf_splice(buf, 0, buf->len, | |
175 | get_index_file(), strlen(get_index_file())); | |
176 | else if (git_db_env && dir_prefix(base, "objects")) | |
177 | replace_dir(buf, git_dir_len + 7, get_object_directory()); | |
178 | else if (git_common_dir_env) | |
179 | update_common_dir(buf, git_dir_len); | |
180 | } | |
181 | ||
182 | static void do_git_path(struct strbuf *buf, const char *fmt, va_list args) | |
183 | { | |
184 | int gitdir_len; | |
185 | strbuf_addstr(buf, get_git_dir()); | |
186 | if (buf->len && !is_dir_sep(buf->buf[buf->len - 1])) | |
187 | strbuf_addch(buf, '/'); | |
188 | gitdir_len = buf->len; | |
189 | strbuf_vaddf(buf, fmt, args); | |
190 | adjust_git_path(buf, gitdir_len); | |
191 | strbuf_cleanup_path(buf); | |
192 | } | |
193 | ||
194 | void strbuf_git_path(struct strbuf *sb, const char *fmt, ...) | |
195 | { | |
196 | va_list args; | |
197 | va_start(args, fmt); | |
198 | do_git_path(sb, fmt, args); | |
199 | va_end(args); | |
200 | } | |
201 | ||
202 | const char *git_path(const char *fmt, ...) | |
203 | { | |
204 | struct strbuf *pathname = get_pathname(); | |
205 | va_list args; | |
206 | va_start(args, fmt); | |
207 | do_git_path(pathname, fmt, args); | |
208 | va_end(args); | |
209 | return pathname->buf; | |
210 | } | |
211 | ||
212 | char *git_pathdup(const char *fmt, ...) | |
213 | { | |
214 | struct strbuf path = STRBUF_INIT; | |
215 | va_list args; | |
216 | va_start(args, fmt); | |
217 | do_git_path(&path, fmt, args); | |
218 | va_end(args); | |
219 | return strbuf_detach(&path, NULL); | |
220 | } | |
221 | ||
222 | char *mkpathdup(const char *fmt, ...) | |
223 | { | |
224 | struct strbuf sb = STRBUF_INIT; | |
225 | va_list args; | |
226 | va_start(args, fmt); | |
227 | strbuf_vaddf(&sb, fmt, args); | |
228 | va_end(args); | |
229 | strbuf_cleanup_path(&sb); | |
230 | return strbuf_detach(&sb, NULL); | |
231 | } | |
232 | ||
233 | const char *mkpath(const char *fmt, ...) | |
234 | { | |
235 | va_list args; | |
236 | struct strbuf *pathname = get_pathname(); | |
237 | va_start(args, fmt); | |
238 | strbuf_vaddf(pathname, fmt, args); | |
239 | va_end(args); | |
240 | return cleanup_path(pathname->buf); | |
241 | } | |
242 | ||
243 | static void do_submodule_path(struct strbuf *buf, const char *path, | |
244 | const char *fmt, va_list args) | |
245 | { | |
246 | const char *git_dir; | |
247 | ||
248 | strbuf_addstr(buf, path); | |
249 | if (buf->len && buf->buf[buf->len - 1] != '/') | |
250 | strbuf_addch(buf, '/'); | |
251 | strbuf_addstr(buf, ".git"); | |
252 | ||
253 | git_dir = read_gitfile(buf->buf); | |
254 | if (git_dir) { | |
255 | strbuf_reset(buf); | |
256 | strbuf_addstr(buf, git_dir); | |
257 | } | |
258 | strbuf_addch(buf, '/'); | |
259 | ||
260 | strbuf_vaddf(buf, fmt, args); | |
261 | strbuf_cleanup_path(buf); | |
262 | } | |
263 | ||
264 | char *git_pathdup_submodule(const char *path, const char *fmt, ...) | |
265 | { | |
266 | va_list args; | |
267 | struct strbuf buf = STRBUF_INIT; | |
268 | va_start(args, fmt); | |
269 | do_submodule_path(&buf, path, fmt, args); | |
270 | va_end(args); | |
271 | return strbuf_detach(&buf, NULL); | |
272 | } | |
273 | ||
274 | void strbuf_git_path_submodule(struct strbuf *buf, const char *path, | |
275 | const char *fmt, ...) | |
276 | { | |
277 | va_list args; | |
278 | va_start(args, fmt); | |
279 | do_submodule_path(buf, path, fmt, args); | |
280 | va_end(args); | |
281 | } | |
282 | ||
283 | int validate_headref(const char *path) | |
284 | { | |
285 | struct stat st; | |
286 | char *buf, buffer[256]; | |
287 | unsigned char sha1[20]; | |
288 | int fd; | |
289 | ssize_t len; | |
290 | ||
291 | if (lstat(path, &st) < 0) | |
292 | return -1; | |
293 | ||
294 | /* Make sure it is a "refs/.." symlink */ | |
295 | if (S_ISLNK(st.st_mode)) { | |
296 | len = readlink(path, buffer, sizeof(buffer)-1); | |
297 | if (len >= 5 && !memcmp("refs/", buffer, 5)) | |
298 | return 0; | |
299 | return -1; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Anything else, just open it and try to see if it is a symbolic ref. | |
304 | */ | |
305 | fd = open(path, O_RDONLY); | |
306 | if (fd < 0) | |
307 | return -1; | |
308 | len = read_in_full(fd, buffer, sizeof(buffer)-1); | |
309 | close(fd); | |
310 | ||
311 | /* | |
312 | * Is it a symbolic ref? | |
313 | */ | |
314 | if (len < 4) | |
315 | return -1; | |
316 | if (!memcmp("ref:", buffer, 4)) { | |
317 | buf = buffer + 4; | |
318 | len -= 4; | |
319 | while (len && isspace(*buf)) | |
320 | buf++, len--; | |
321 | if (len >= 5 && !memcmp("refs/", buf, 5)) | |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Is this a detached HEAD? | |
327 | */ | |
328 | if (!get_sha1_hex(buffer, sha1)) | |
329 | return 0; | |
330 | ||
331 | return -1; | |
332 | } | |
333 | ||
334 | static struct passwd *getpw_str(const char *username, size_t len) | |
335 | { | |
336 | struct passwd *pw; | |
337 | char *username_z = xmemdupz(username, len); | |
338 | pw = getpwnam(username_z); | |
339 | free(username_z); | |
340 | return pw; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Return a string with ~ and ~user expanded via getpw*. If buf != NULL, | |
345 | * then it is a newly allocated string. Returns NULL on getpw failure or | |
346 | * if path is NULL. | |
347 | */ | |
348 | char *expand_user_path(const char *path) | |
349 | { | |
350 | struct strbuf user_path = STRBUF_INIT; | |
351 | const char *to_copy = path; | |
352 | ||
353 | if (path == NULL) | |
354 | goto return_null; | |
355 | if (path[0] == '~') { | |
356 | const char *first_slash = strchrnul(path, '/'); | |
357 | const char *username = path + 1; | |
358 | size_t username_len = first_slash - username; | |
359 | if (username_len == 0) { | |
360 | const char *home = getenv("HOME"); | |
361 | if (!home) | |
362 | goto return_null; | |
363 | strbuf_addstr(&user_path, home); | |
364 | } else { | |
365 | struct passwd *pw = getpw_str(username, username_len); | |
366 | if (!pw) | |
367 | goto return_null; | |
368 | strbuf_addstr(&user_path, pw->pw_dir); | |
369 | } | |
370 | to_copy = first_slash; | |
371 | } | |
372 | strbuf_addstr(&user_path, to_copy); | |
373 | return strbuf_detach(&user_path, NULL); | |
374 | return_null: | |
375 | strbuf_release(&user_path); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* | |
380 | * First, one directory to try is determined by the following algorithm. | |
381 | * | |
382 | * (0) If "strict" is given, the path is used as given and no DWIM is | |
383 | * done. Otherwise: | |
384 | * (1) "~/path" to mean path under the running user's home directory; | |
385 | * (2) "~user/path" to mean path under named user's home directory; | |
386 | * (3) "relative/path" to mean cwd relative directory; or | |
387 | * (4) "/absolute/path" to mean absolute directory. | |
388 | * | |
389 | * Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git" | |
390 | * in this order. We select the first one that is a valid git repository, and | |
391 | * chdir() to it. If none match, or we fail to chdir, we return NULL. | |
392 | * | |
393 | * If all goes well, we return the directory we used to chdir() (but | |
394 | * before ~user is expanded), avoiding getcwd() resolving symbolic | |
395 | * links. User relative paths are also returned as they are given, | |
396 | * except DWIM suffixing. | |
397 | */ | |
398 | const char *enter_repo(const char *path, int strict) | |
399 | { | |
400 | static char used_path[PATH_MAX]; | |
401 | static char validated_path[PATH_MAX]; | |
402 | ||
403 | if (!path) | |
404 | return NULL; | |
405 | ||
406 | if (!strict) { | |
407 | static const char *suffix[] = { | |
408 | "/.git", "", ".git/.git", ".git", NULL, | |
409 | }; | |
410 | const char *gitfile; | |
411 | int len = strlen(path); | |
412 | int i; | |
413 | while ((1 < len) && (path[len-1] == '/')) | |
414 | len--; | |
415 | ||
416 | if (PATH_MAX <= len) | |
417 | return NULL; | |
418 | strncpy(used_path, path, len); used_path[len] = 0 ; | |
419 | strcpy(validated_path, used_path); | |
420 | ||
421 | if (used_path[0] == '~') { | |
422 | char *newpath = expand_user_path(used_path); | |
423 | if (!newpath || (PATH_MAX - 10 < strlen(newpath))) { | |
424 | free(newpath); | |
425 | return NULL; | |
426 | } | |
427 | /* | |
428 | * Copy back into the static buffer. A pity | |
429 | * since newpath was not bounded, but other | |
430 | * branches of the if are limited by PATH_MAX | |
431 | * anyway. | |
432 | */ | |
433 | strcpy(used_path, newpath); free(newpath); | |
434 | } | |
435 | else if (PATH_MAX - 10 < len) | |
436 | return NULL; | |
437 | len = strlen(used_path); | |
438 | for (i = 0; suffix[i]; i++) { | |
439 | struct stat st; | |
440 | strcpy(used_path + len, suffix[i]); | |
441 | if (!stat(used_path, &st) && | |
442 | (S_ISREG(st.st_mode) || | |
443 | (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) { | |
444 | strcat(validated_path, suffix[i]); | |
445 | break; | |
446 | } | |
447 | } | |
448 | if (!suffix[i]) | |
449 | return NULL; | |
450 | gitfile = read_gitfile(used_path) ; | |
451 | if (gitfile) | |
452 | strcpy(used_path, gitfile); | |
453 | if (chdir(used_path)) | |
454 | return NULL; | |
455 | path = validated_path; | |
456 | } | |
457 | else if (chdir(path)) | |
458 | return NULL; | |
459 | ||
460 | if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && | |
461 | validate_headref("HEAD") == 0) { | |
462 | set_git_dir("."); | |
463 | check_repository_format(); | |
464 | return path; | |
465 | } | |
466 | ||
467 | return NULL; | |
468 | } | |
469 | ||
470 | static int calc_shared_perm(int mode) | |
471 | { | |
472 | int tweak; | |
473 | ||
474 | if (shared_repository < 0) | |
475 | tweak = -shared_repository; | |
476 | else | |
477 | tweak = shared_repository; | |
478 | ||
479 | if (!(mode & S_IWUSR)) | |
480 | tweak &= ~0222; | |
481 | if (mode & S_IXUSR) | |
482 | /* Copy read bits to execute bits */ | |
483 | tweak |= (tweak & 0444) >> 2; | |
484 | if (shared_repository < 0) | |
485 | mode = (mode & ~0777) | tweak; | |
486 | else | |
487 | mode |= tweak; | |
488 | ||
489 | return mode; | |
490 | } | |
491 | ||
492 | ||
493 | int adjust_shared_perm(const char *path) | |
494 | { | |
495 | int old_mode, new_mode; | |
496 | ||
497 | if (!shared_repository) | |
498 | return 0; | |
499 | if (get_st_mode_bits(path, &old_mode) < 0) | |
500 | return -1; | |
501 | ||
502 | new_mode = calc_shared_perm(old_mode); | |
503 | if (S_ISDIR(old_mode)) { | |
504 | /* Copy read bits to execute bits */ | |
505 | new_mode |= (new_mode & 0444) >> 2; | |
506 | new_mode |= FORCE_DIR_SET_GID; | |
507 | } | |
508 | ||
509 | if (((old_mode ^ new_mode) & ~S_IFMT) && | |
510 | chmod(path, (new_mode & ~S_IFMT)) < 0) | |
511 | return -2; | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int have_same_root(const char *path1, const char *path2) | |
516 | { | |
517 | int is_abs1, is_abs2; | |
518 | ||
519 | is_abs1 = is_absolute_path(path1); | |
520 | is_abs2 = is_absolute_path(path2); | |
521 | return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) || | |
522 | (!is_abs1 && !is_abs2); | |
523 | } | |
524 | ||
525 | /* | |
526 | * Give path as relative to prefix. | |
527 | * | |
528 | * The strbuf may or may not be used, so do not assume it contains the | |
529 | * returned path. | |
530 | */ | |
531 | const char *relative_path(const char *in, const char *prefix, | |
532 | struct strbuf *sb) | |
533 | { | |
534 | int in_len = in ? strlen(in) : 0; | |
535 | int prefix_len = prefix ? strlen(prefix) : 0; | |
536 | int in_off = 0; | |
537 | int prefix_off = 0; | |
538 | int i = 0, j = 0; | |
539 | ||
540 | if (!in_len) | |
541 | return "./"; | |
542 | else if (!prefix_len) | |
543 | return in; | |
544 | ||
545 | if (have_same_root(in, prefix)) { | |
546 | /* bypass dos_drive, for "c:" is identical to "C:" */ | |
547 | if (has_dos_drive_prefix(in)) { | |
548 | i = 2; | |
549 | j = 2; | |
550 | } | |
551 | } else { | |
552 | return in; | |
553 | } | |
554 | ||
555 | while (i < prefix_len && j < in_len && prefix[i] == in[j]) { | |
556 | if (is_dir_sep(prefix[i])) { | |
557 | while (is_dir_sep(prefix[i])) | |
558 | i++; | |
559 | while (is_dir_sep(in[j])) | |
560 | j++; | |
561 | prefix_off = i; | |
562 | in_off = j; | |
563 | } else { | |
564 | i++; | |
565 | j++; | |
566 | } | |
567 | } | |
568 | ||
569 | if ( | |
570 | /* "prefix" seems like prefix of "in" */ | |
571 | i >= prefix_len && | |
572 | /* | |
573 | * but "/foo" is not a prefix of "/foobar" | |
574 | * (i.e. prefix not end with '/') | |
575 | */ | |
576 | prefix_off < prefix_len) { | |
577 | if (j >= in_len) { | |
578 | /* in="/a/b", prefix="/a/b" */ | |
579 | in_off = in_len; | |
580 | } else if (is_dir_sep(in[j])) { | |
581 | /* in="/a/b/c", prefix="/a/b" */ | |
582 | while (is_dir_sep(in[j])) | |
583 | j++; | |
584 | in_off = j; | |
585 | } else { | |
586 | /* in="/a/bbb/c", prefix="/a/b" */ | |
587 | i = prefix_off; | |
588 | } | |
589 | } else if ( | |
590 | /* "in" is short than "prefix" */ | |
591 | j >= in_len && | |
592 | /* "in" not end with '/' */ | |
593 | in_off < in_len) { | |
594 | if (is_dir_sep(prefix[i])) { | |
595 | /* in="/a/b", prefix="/a/b/c/" */ | |
596 | while (is_dir_sep(prefix[i])) | |
597 | i++; | |
598 | in_off = in_len; | |
599 | } | |
600 | } | |
601 | in += in_off; | |
602 | in_len -= in_off; | |
603 | ||
604 | if (i >= prefix_len) { | |
605 | if (!in_len) | |
606 | return "./"; | |
607 | else | |
608 | return in; | |
609 | } | |
610 | ||
611 | strbuf_reset(sb); | |
612 | strbuf_grow(sb, in_len); | |
613 | ||
614 | while (i < prefix_len) { | |
615 | if (is_dir_sep(prefix[i])) { | |
616 | strbuf_addstr(sb, "../"); | |
617 | while (is_dir_sep(prefix[i])) | |
618 | i++; | |
619 | continue; | |
620 | } | |
621 | i++; | |
622 | } | |
623 | if (!is_dir_sep(prefix[prefix_len - 1])) | |
624 | strbuf_addstr(sb, "../"); | |
625 | ||
626 | strbuf_addstr(sb, in); | |
627 | ||
628 | return sb->buf; | |
629 | } | |
630 | ||
631 | /* | |
632 | * A simpler implementation of relative_path | |
633 | * | |
634 | * Get relative path by removing "prefix" from "in". This function | |
635 | * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter | |
636 | * to increase performance when traversing the path to work_tree. | |
637 | */ | |
638 | const char *remove_leading_path(const char *in, const char *prefix) | |
639 | { | |
640 | static char buf[PATH_MAX + 1]; | |
641 | int i = 0, j = 0; | |
642 | ||
643 | if (!prefix || !prefix[0]) | |
644 | return in; | |
645 | while (prefix[i]) { | |
646 | if (is_dir_sep(prefix[i])) { | |
647 | if (!is_dir_sep(in[j])) | |
648 | return in; | |
649 | while (is_dir_sep(prefix[i])) | |
650 | i++; | |
651 | while (is_dir_sep(in[j])) | |
652 | j++; | |
653 | continue; | |
654 | } else if (in[j] != prefix[i]) { | |
655 | return in; | |
656 | } | |
657 | i++; | |
658 | j++; | |
659 | } | |
660 | if ( | |
661 | /* "/foo" is a prefix of "/foo" */ | |
662 | in[j] && | |
663 | /* "/foo" is not a prefix of "/foobar" */ | |
664 | !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j]) | |
665 | ) | |
666 | return in; | |
667 | while (is_dir_sep(in[j])) | |
668 | j++; | |
669 | if (!in[j]) | |
670 | strcpy(buf, "."); | |
671 | else | |
672 | strcpy(buf, in + j); | |
673 | return buf; | |
674 | } | |
675 | ||
676 | /* | |
677 | * It is okay if dst == src, but they should not overlap otherwise. | |
678 | * | |
679 | * Performs the following normalizations on src, storing the result in dst: | |
680 | * - Ensures that components are separated by '/' (Windows only) | |
681 | * - Squashes sequences of '/'. | |
682 | * - Removes "." components. | |
683 | * - Removes ".." components, and the components the precede them. | |
684 | * Returns failure (non-zero) if a ".." component appears as first path | |
685 | * component anytime during the normalization. Otherwise, returns success (0). | |
686 | * | |
687 | * Note that this function is purely textual. It does not follow symlinks, | |
688 | * verify the existence of the path, or make any system calls. | |
689 | * | |
690 | * prefix_len != NULL is for a specific case of prefix_pathspec(): | |
691 | * assume that src == dst and src[0..prefix_len-1] is already | |
692 | * normalized, any time "../" eats up to the prefix_len part, | |
693 | * prefix_len is reduced. In the end prefix_len is the remaining | |
694 | * prefix that has not been overridden by user pathspec. | |
695 | */ | |
696 | int normalize_path_copy_len(char *dst, const char *src, int *prefix_len) | |
697 | { | |
698 | char *dst0; | |
699 | ||
700 | if (has_dos_drive_prefix(src)) { | |
701 | *dst++ = *src++; | |
702 | *dst++ = *src++; | |
703 | } | |
704 | dst0 = dst; | |
705 | ||
706 | if (is_dir_sep(*src)) { | |
707 | *dst++ = '/'; | |
708 | while (is_dir_sep(*src)) | |
709 | src++; | |
710 | } | |
711 | ||
712 | for (;;) { | |
713 | char c = *src; | |
714 | ||
715 | /* | |
716 | * A path component that begins with . could be | |
717 | * special: | |
718 | * (1) "." and ends -- ignore and terminate. | |
719 | * (2) "./" -- ignore them, eat slash and continue. | |
720 | * (3) ".." and ends -- strip one and terminate. | |
721 | * (4) "../" -- strip one, eat slash and continue. | |
722 | */ | |
723 | if (c == '.') { | |
724 | if (!src[1]) { | |
725 | /* (1) */ | |
726 | src++; | |
727 | } else if (is_dir_sep(src[1])) { | |
728 | /* (2) */ | |
729 | src += 2; | |
730 | while (is_dir_sep(*src)) | |
731 | src++; | |
732 | continue; | |
733 | } else if (src[1] == '.') { | |
734 | if (!src[2]) { | |
735 | /* (3) */ | |
736 | src += 2; | |
737 | goto up_one; | |
738 | } else if (is_dir_sep(src[2])) { | |
739 | /* (4) */ | |
740 | src += 3; | |
741 | while (is_dir_sep(*src)) | |
742 | src++; | |
743 | goto up_one; | |
744 | } | |
745 | } | |
746 | } | |
747 | ||
748 | /* copy up to the next '/', and eat all '/' */ | |
749 | while ((c = *src++) != '\0' && !is_dir_sep(c)) | |
750 | *dst++ = c; | |
751 | if (is_dir_sep(c)) { | |
752 | *dst++ = '/'; | |
753 | while (is_dir_sep(c)) | |
754 | c = *src++; | |
755 | src--; | |
756 | } else if (!c) | |
757 | break; | |
758 | continue; | |
759 | ||
760 | up_one: | |
761 | /* | |
762 | * dst0..dst is prefix portion, and dst[-1] is '/'; | |
763 | * go up one level. | |
764 | */ | |
765 | dst--; /* go to trailing '/' */ | |
766 | if (dst <= dst0) | |
767 | return -1; | |
768 | /* Windows: dst[-1] cannot be backslash anymore */ | |
769 | while (dst0 < dst && dst[-1] != '/') | |
770 | dst--; | |
771 | if (prefix_len && *prefix_len > dst - dst0) | |
772 | *prefix_len = dst - dst0; | |
773 | } | |
774 | *dst = '\0'; | |
775 | return 0; | |
776 | } | |
777 | ||
778 | int normalize_path_copy(char *dst, const char *src) | |
779 | { | |
780 | return normalize_path_copy_len(dst, src, NULL); | |
781 | } | |
782 | ||
783 | /* | |
784 | * path = Canonical absolute path | |
785 | * prefixes = string_list containing normalized, absolute paths without | |
786 | * trailing slashes (except for the root directory, which is denoted by "/"). | |
787 | * | |
788 | * Determines, for each path in prefixes, whether the "prefix" | |
789 | * is an ancestor directory of path. Returns the length of the longest | |
790 | * ancestor directory, excluding any trailing slashes, or -1 if no prefix | |
791 | * is an ancestor. (Note that this means 0 is returned if prefixes is | |
792 | * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories | |
793 | * are not considered to be their own ancestors. path must be in a | |
794 | * canonical form: empty components, or "." or ".." components are not | |
795 | * allowed. | |
796 | */ | |
797 | int longest_ancestor_length(const char *path, struct string_list *prefixes) | |
798 | { | |
799 | int i, max_len = -1; | |
800 | ||
801 | if (!strcmp(path, "/")) | |
802 | return -1; | |
803 | ||
804 | for (i = 0; i < prefixes->nr; i++) { | |
805 | const char *ceil = prefixes->items[i].string; | |
806 | int len = strlen(ceil); | |
807 | ||
808 | if (len == 1 && ceil[0] == '/') | |
809 | len = 0; /* root matches anything, with length 0 */ | |
810 | else if (!strncmp(path, ceil, len) && path[len] == '/') | |
811 | ; /* match of length len */ | |
812 | else | |
813 | continue; /* no match */ | |
814 | ||
815 | if (len > max_len) | |
816 | max_len = len; | |
817 | } | |
818 | ||
819 | return max_len; | |
820 | } | |
821 | ||
822 | /* strip arbitrary amount of directory separators at end of path */ | |
823 | static inline int chomp_trailing_dir_sep(const char *path, int len) | |
824 | { | |
825 | while (len && is_dir_sep(path[len - 1])) | |
826 | len--; | |
827 | return len; | |
828 | } | |
829 | ||
830 | /* | |
831 | * If path ends with suffix (complete path components), returns the | |
832 | * part before suffix (sans trailing directory separators). | |
833 | * Otherwise returns NULL. | |
834 | */ | |
835 | char *strip_path_suffix(const char *path, const char *suffix) | |
836 | { | |
837 | int path_len = strlen(path), suffix_len = strlen(suffix); | |
838 | ||
839 | while (suffix_len) { | |
840 | if (!path_len) | |
841 | return NULL; | |
842 | ||
843 | if (is_dir_sep(path[path_len - 1])) { | |
844 | if (!is_dir_sep(suffix[suffix_len - 1])) | |
845 | return NULL; | |
846 | path_len = chomp_trailing_dir_sep(path, path_len); | |
847 | suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); | |
848 | } | |
849 | else if (path[--path_len] != suffix[--suffix_len]) | |
850 | return NULL; | |
851 | } | |
852 | ||
853 | if (path_len && !is_dir_sep(path[path_len - 1])) | |
854 | return NULL; | |
855 | return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); | |
856 | } | |
857 | ||
858 | int daemon_avoid_alias(const char *p) | |
859 | { | |
860 | int sl, ndot; | |
861 | ||
862 | /* | |
863 | * This resurrects the belts and suspenders paranoia check by HPA | |
864 | * done in <435560F7.4080006@zytor.com> thread, now enter_repo() | |
865 | * does not do getcwd() based path canonicalization. | |
866 | * | |
867 | * sl becomes true immediately after seeing '/' and continues to | |
868 | * be true as long as dots continue after that without intervening | |
869 | * non-dot character. | |
870 | */ | |
871 | if (!p || (*p != '/' && *p != '~')) | |
872 | return -1; | |
873 | sl = 1; ndot = 0; | |
874 | p++; | |
875 | ||
876 | while (1) { | |
877 | char ch = *p++; | |
878 | if (sl) { | |
879 | if (ch == '.') | |
880 | ndot++; | |
881 | else if (ch == '/') { | |
882 | if (ndot < 3) | |
883 | /* reject //, /./ and /../ */ | |
884 | return -1; | |
885 | ndot = 0; | |
886 | } | |
887 | else if (ch == 0) { | |
888 | if (0 < ndot && ndot < 3) | |
889 | /* reject /.$ and /..$ */ | |
890 | return -1; | |
891 | return 0; | |
892 | } | |
893 | else | |
894 | sl = ndot = 0; | |
895 | } | |
896 | else if (ch == 0) | |
897 | return 0; | |
898 | else if (ch == '/') { | |
899 | sl = 1; | |
900 | ndot = 0; | |
901 | } | |
902 | } | |
903 | } | |
904 | ||
905 | static int only_spaces_and_periods(const char *path, size_t len, size_t skip) | |
906 | { | |
907 | if (len < skip) | |
908 | return 0; | |
909 | len -= skip; | |
910 | path += skip; | |
911 | while (len-- > 0) { | |
912 | char c = *(path++); | |
913 | if (c != ' ' && c != '.') | |
914 | return 0; | |
915 | } | |
916 | return 1; | |
917 | } | |
918 | ||
919 | int is_ntfs_dotgit(const char *name) | |
920 | { | |
921 | int len; | |
922 | ||
923 | for (len = 0; ; len++) | |
924 | if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) { | |
925 | if (only_spaces_and_periods(name, len, 4) && | |
926 | !strncasecmp(name, ".git", 4)) | |
927 | return 1; | |
928 | if (only_spaces_and_periods(name, len, 5) && | |
929 | !strncasecmp(name, "git~1", 5)) | |
930 | return 1; | |
931 | if (name[len] != '\\') | |
932 | return 0; | |
933 | name += len + 1; | |
934 | len = -1; | |
935 | } | |
936 | } | |
937 | ||
938 | char *xdg_config_home(const char *filename) | |
939 | { | |
940 | const char *home, *config_home; | |
941 | ||
942 | assert(filename); | |
943 | config_home = getenv("XDG_CONFIG_HOME"); | |
944 | if (config_home && *config_home) | |
945 | return mkpathdup("%s/git/%s", config_home, filename); | |
946 | ||
947 | home = getenv("HOME"); | |
948 | if (home) | |
949 | return mkpathdup("%s/.config/git/%s", home, filename); | |
950 | return NULL; | |
951 | } | |
952 | ||
953 | GIT_PATH_FUNC(git_path_cherry_pick_head, "CHERRY_PICK_HEAD") | |
954 | GIT_PATH_FUNC(git_path_revert_head, "REVERT_HEAD") | |
955 | GIT_PATH_FUNC(git_path_squash_msg, "SQUASH_MSG") | |
956 | GIT_PATH_FUNC(git_path_merge_msg, "MERGE_MSG") | |
957 | GIT_PATH_FUNC(git_path_merge_rr, "MERGE_RR") | |
958 | GIT_PATH_FUNC(git_path_merge_mode, "MERGE_MODE") | |
959 | GIT_PATH_FUNC(git_path_merge_head, "MERGE_HEAD") | |
960 | GIT_PATH_FUNC(git_path_fetch_head, "FETCH_HEAD") | |
961 | GIT_PATH_FUNC(git_path_shallow, "shallow") |