read_directory_recursive(): refactor handling of a single path into a separate function
[git/git.git] / dir.c
1 /*
2 * This handles recursive filename detection with exclude
3 * files, index knowledge etc..
4 *
5 * Copyright (C) Linus Torvalds, 2005-2006
6 * Junio Hamano, 2005-2006
7 */
8 #include "cache.h"
9 #include "dir.h"
10 #include "refs.h"
11
12 struct path_simplify {
13 int len;
14 const char *path;
15 };
16
17 static int read_directory_recursive(struct dir_struct *dir, const char *path, int len,
18 int check_only, const struct path_simplify *simplify);
19 static int get_dtype(struct dirent *de, const char *path, int len);
20
21 static int common_prefix(const char **pathspec)
22 {
23 const char *path, *slash, *next;
24 int prefix;
25
26 if (!pathspec)
27 return 0;
28
29 path = *pathspec;
30 slash = strrchr(path, '/');
31 if (!slash)
32 return 0;
33
34 prefix = slash - path + 1;
35 while ((next = *++pathspec) != NULL) {
36 int len = strlen(next);
37 if (len >= prefix && !memcmp(path, next, prefix))
38 continue;
39 len = prefix - 1;
40 for (;;) {
41 if (!len)
42 return 0;
43 if (next[--len] != '/')
44 continue;
45 if (memcmp(path, next, len+1))
46 continue;
47 prefix = len + 1;
48 break;
49 }
50 }
51 return prefix;
52 }
53
54 int fill_directory(struct dir_struct *dir, const char **pathspec)
55 {
56 const char *path;
57 int len;
58
59 /*
60 * Calculate common prefix for the pathspec, and
61 * use that to optimize the directory walk
62 */
63 len = common_prefix(pathspec);
64 path = "";
65
66 if (len)
67 path = xmemdupz(*pathspec, len);
68
69 /* Read the directory and prune it */
70 read_directory(dir, path, len, pathspec);
71 return len;
72 }
73
74 /*
75 * Does 'match' match the given name?
76 * A match is found if
77 *
78 * (1) the 'match' string is leading directory of 'name', or
79 * (2) the 'match' string is a wildcard and matches 'name', or
80 * (3) the 'match' string is exactly the same as 'name'.
81 *
82 * and the return value tells which case it was.
83 *
84 * It returns 0 when there is no match.
85 */
86 static int match_one(const char *match, const char *name, int namelen)
87 {
88 int matchlen;
89
90 /* If the match was just the prefix, we matched */
91 if (!*match)
92 return MATCHED_RECURSIVELY;
93
94 for (;;) {
95 unsigned char c1 = *match;
96 unsigned char c2 = *name;
97 if (c1 == '\0' || is_glob_special(c1))
98 break;
99 if (c1 != c2)
100 return 0;
101 match++;
102 name++;
103 namelen--;
104 }
105
106
107 /*
108 * If we don't match the matchstring exactly,
109 * we need to match by fnmatch
110 */
111 matchlen = strlen(match);
112 if (strncmp(match, name, matchlen))
113 return !fnmatch(match, name, 0) ? MATCHED_FNMATCH : 0;
114
115 if (namelen == matchlen)
116 return MATCHED_EXACTLY;
117 if (match[matchlen-1] == '/' || name[matchlen] == '/')
118 return MATCHED_RECURSIVELY;
119 return 0;
120 }
121
122 /*
123 * Given a name and a list of pathspecs, see if the name matches
124 * any of the pathspecs. The caller is also interested in seeing
125 * all pathspec matches some names it calls this function with
126 * (otherwise the user could have mistyped the unmatched pathspec),
127 * and a mark is left in seen[] array for pathspec element that
128 * actually matched anything.
129 */
130 int match_pathspec(const char **pathspec, const char *name, int namelen,
131 int prefix, char *seen)
132 {
133 int i, retval = 0;
134
135 if (!pathspec)
136 return 1;
137
138 name += prefix;
139 namelen -= prefix;
140
141 for (i = 0; pathspec[i] != NULL; i++) {
142 int how;
143 const char *match = pathspec[i] + prefix;
144 if (seen && seen[i] == MATCHED_EXACTLY)
145 continue;
146 how = match_one(match, name, namelen);
147 if (how) {
148 if (retval < how)
149 retval = how;
150 if (seen && seen[i] < how)
151 seen[i] = how;
152 }
153 }
154 return retval;
155 }
156
157 static int no_wildcard(const char *string)
158 {
159 return string[strcspn(string, "*?[{\\")] == '\0';
160 }
161
162 void add_exclude(const char *string, const char *base,
163 int baselen, struct exclude_list *which)
164 {
165 struct exclude *x;
166 size_t len;
167 int to_exclude = 1;
168 int flags = 0;
169
170 if (*string == '!') {
171 to_exclude = 0;
172 string++;
173 }
174 len = strlen(string);
175 if (len && string[len - 1] == '/') {
176 char *s;
177 x = xmalloc(sizeof(*x) + len);
178 s = (char *)(x+1);
179 memcpy(s, string, len - 1);
180 s[len - 1] = '\0';
181 string = s;
182 x->pattern = s;
183 flags = EXC_FLAG_MUSTBEDIR;
184 } else {
185 x = xmalloc(sizeof(*x));
186 x->pattern = string;
187 }
188 x->to_exclude = to_exclude;
189 x->patternlen = strlen(string);
190 x->base = base;
191 x->baselen = baselen;
192 x->flags = flags;
193 if (!strchr(string, '/'))
194 x->flags |= EXC_FLAG_NODIR;
195 if (no_wildcard(string))
196 x->flags |= EXC_FLAG_NOWILDCARD;
197 if (*string == '*' && no_wildcard(string+1))
198 x->flags |= EXC_FLAG_ENDSWITH;
199 ALLOC_GROW(which->excludes, which->nr + 1, which->alloc);
200 which->excludes[which->nr++] = x;
201 }
202
203 static int add_excludes_from_file_1(const char *fname,
204 const char *base,
205 int baselen,
206 char **buf_p,
207 struct exclude_list *which)
208 {
209 struct stat st;
210 int fd, i;
211 size_t size;
212 char *buf, *entry;
213
214 fd = open(fname, O_RDONLY);
215 if (fd < 0 || fstat(fd, &st) < 0)
216 goto err;
217 size = xsize_t(st.st_size);
218 if (size == 0) {
219 close(fd);
220 return 0;
221 }
222 buf = xmalloc(size+1);
223 if (read_in_full(fd, buf, size) != size)
224 {
225 free(buf);
226 goto err;
227 }
228 close(fd);
229
230 if (buf_p)
231 *buf_p = buf;
232 buf[size++] = '\n';
233 entry = buf;
234 for (i = 0; i < size; i++) {
235 if (buf[i] == '\n') {
236 if (entry != buf + i && entry[0] != '#') {
237 buf[i - (i && buf[i-1] == '\r')] = 0;
238 add_exclude(entry, base, baselen, which);
239 }
240 entry = buf + i + 1;
241 }
242 }
243 return 0;
244
245 err:
246 if (0 <= fd)
247 close(fd);
248 return -1;
249 }
250
251 void add_excludes_from_file(struct dir_struct *dir, const char *fname)
252 {
253 if (add_excludes_from_file_1(fname, "", 0, NULL,
254 &dir->exclude_list[EXC_FILE]) < 0)
255 die("cannot use %s as an exclude file", fname);
256 }
257
258 static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
259 {
260 struct exclude_list *el;
261 struct exclude_stack *stk = NULL;
262 int current;
263
264 if ((!dir->exclude_per_dir) ||
265 (baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
266 return; /* too long a path -- ignore */
267
268 /* Pop the ones that are not the prefix of the path being checked. */
269 el = &dir->exclude_list[EXC_DIRS];
270 while ((stk = dir->exclude_stack) != NULL) {
271 if (stk->baselen <= baselen &&
272 !strncmp(dir->basebuf, base, stk->baselen))
273 break;
274 dir->exclude_stack = stk->prev;
275 while (stk->exclude_ix < el->nr)
276 free(el->excludes[--el->nr]);
277 free(stk->filebuf);
278 free(stk);
279 }
280
281 /* Read from the parent directories and push them down. */
282 current = stk ? stk->baselen : -1;
283 while (current < baselen) {
284 struct exclude_stack *stk = xcalloc(1, sizeof(*stk));
285 const char *cp;
286
287 if (current < 0) {
288 cp = base;
289 current = 0;
290 }
291 else {
292 cp = strchr(base + current + 1, '/');
293 if (!cp)
294 die("oops in prep_exclude");
295 cp++;
296 }
297 stk->prev = dir->exclude_stack;
298 stk->baselen = cp - base;
299 stk->exclude_ix = el->nr;
300 memcpy(dir->basebuf + current, base + current,
301 stk->baselen - current);
302 strcpy(dir->basebuf + stk->baselen, dir->exclude_per_dir);
303 add_excludes_from_file_1(dir->basebuf,
304 dir->basebuf, stk->baselen,
305 &stk->filebuf, el);
306 dir->exclude_stack = stk;
307 current = stk->baselen;
308 }
309 dir->basebuf[baselen] = '\0';
310 }
311
312 /* Scan the list and let the last match determine the fate.
313 * Return 1 for exclude, 0 for include and -1 for undecided.
314 */
315 static int excluded_1(const char *pathname,
316 int pathlen, const char *basename, int *dtype,
317 struct exclude_list *el)
318 {
319 int i;
320
321 if (el->nr) {
322 for (i = el->nr - 1; 0 <= i; i--) {
323 struct exclude *x = el->excludes[i];
324 const char *exclude = x->pattern;
325 int to_exclude = x->to_exclude;
326
327 if (x->flags & EXC_FLAG_MUSTBEDIR) {
328 if (*dtype == DT_UNKNOWN)
329 *dtype = get_dtype(NULL, pathname, pathlen);
330 if (*dtype != DT_DIR)
331 continue;
332 }
333
334 if (x->flags & EXC_FLAG_NODIR) {
335 /* match basename */
336 if (x->flags & EXC_FLAG_NOWILDCARD) {
337 if (!strcmp(exclude, basename))
338 return to_exclude;
339 } else if (x->flags & EXC_FLAG_ENDSWITH) {
340 if (x->patternlen - 1 <= pathlen &&
341 !strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
342 return to_exclude;
343 } else {
344 if (fnmatch(exclude, basename, 0) == 0)
345 return to_exclude;
346 }
347 }
348 else {
349 /* match with FNM_PATHNAME:
350 * exclude has base (baselen long) implicitly
351 * in front of it.
352 */
353 int baselen = x->baselen;
354 if (*exclude == '/')
355 exclude++;
356
357 if (pathlen < baselen ||
358 (baselen && pathname[baselen-1] != '/') ||
359 strncmp(pathname, x->base, baselen))
360 continue;
361
362 if (x->flags & EXC_FLAG_NOWILDCARD) {
363 if (!strcmp(exclude, pathname + baselen))
364 return to_exclude;
365 } else {
366 if (fnmatch(exclude, pathname+baselen,
367 FNM_PATHNAME) == 0)
368 return to_exclude;
369 }
370 }
371 }
372 }
373 return -1; /* undecided */
374 }
375
376 int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
377 {
378 int pathlen = strlen(pathname);
379 int st;
380 const char *basename = strrchr(pathname, '/');
381 basename = (basename) ? basename+1 : pathname;
382
383 prep_exclude(dir, pathname, basename-pathname);
384 for (st = EXC_CMDL; st <= EXC_FILE; st++) {
385 switch (excluded_1(pathname, pathlen, basename,
386 dtype_p, &dir->exclude_list[st])) {
387 case 0:
388 return 0;
389 case 1:
390 return 1;
391 }
392 }
393 return 0;
394 }
395
396 static struct dir_entry *dir_entry_new(const char *pathname, int len)
397 {
398 struct dir_entry *ent;
399
400 ent = xmalloc(sizeof(*ent) + len + 1);
401 ent->len = len;
402 memcpy(ent->name, pathname, len);
403 ent->name[len] = 0;
404 return ent;
405 }
406
407 static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
408 {
409 if (cache_name_exists(pathname, len, ignore_case))
410 return NULL;
411
412 ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
413 return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
414 }
415
416 static struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
417 {
418 if (!cache_name_is_other(pathname, len))
419 return NULL;
420
421 ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
422 return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
423 }
424
425 enum exist_status {
426 index_nonexistent = 0,
427 index_directory,
428 index_gitdir,
429 };
430
431 /*
432 * The index sorts alphabetically by entry name, which
433 * means that a gitlink sorts as '\0' at the end, while
434 * a directory (which is defined not as an entry, but as
435 * the files it contains) will sort with the '/' at the
436 * end.
437 */
438 static enum exist_status directory_exists_in_index(const char *dirname, int len)
439 {
440 int pos = cache_name_pos(dirname, len);
441 if (pos < 0)
442 pos = -pos-1;
443 while (pos < active_nr) {
444 struct cache_entry *ce = active_cache[pos++];
445 unsigned char endchar;
446
447 if (strncmp(ce->name, dirname, len))
448 break;
449 endchar = ce->name[len];
450 if (endchar > '/')
451 break;
452 if (endchar == '/')
453 return index_directory;
454 if (!endchar && S_ISGITLINK(ce->ce_mode))
455 return index_gitdir;
456 }
457 return index_nonexistent;
458 }
459
460 /*
461 * When we find a directory when traversing the filesystem, we
462 * have three distinct cases:
463 *
464 * - ignore it
465 * - see it as a directory
466 * - recurse into it
467 *
468 * and which one we choose depends on a combination of existing
469 * git index contents and the flags passed into the directory
470 * traversal routine.
471 *
472 * Case 1: If we *already* have entries in the index under that
473 * directory name, we always recurse into the directory to see
474 * all the files.
475 *
476 * Case 2: If we *already* have that directory name as a gitlink,
477 * we always continue to see it as a gitlink, regardless of whether
478 * there is an actual git directory there or not (it might not
479 * be checked out as a subproject!)
480 *
481 * Case 3: if we didn't have it in the index previously, we
482 * have a few sub-cases:
483 *
484 * (a) if "show_other_directories" is true, we show it as
485 * just a directory, unless "hide_empty_directories" is
486 * also true and the directory is empty, in which case
487 * we just ignore it entirely.
488 * (b) if it looks like a git directory, and we don't have
489 * 'no_gitlinks' set we treat it as a gitlink, and show it
490 * as a directory.
491 * (c) otherwise, we recurse into it.
492 */
493 enum directory_treatment {
494 show_directory,
495 ignore_directory,
496 recurse_into_directory,
497 };
498
499 static enum directory_treatment treat_directory(struct dir_struct *dir,
500 const char *dirname, int len,
501 const struct path_simplify *simplify)
502 {
503 /* The "len-1" is to strip the final '/' */
504 switch (directory_exists_in_index(dirname, len-1)) {
505 case index_directory:
506 return recurse_into_directory;
507
508 case index_gitdir:
509 if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
510 return ignore_directory;
511 return show_directory;
512
513 case index_nonexistent:
514 if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
515 break;
516 if (!(dir->flags & DIR_NO_GITLINKS)) {
517 unsigned char sha1[20];
518 if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
519 return show_directory;
520 }
521 return recurse_into_directory;
522 }
523
524 /* This is the "show_other_directories" case */
525 if (!(dir->flags & DIR_HIDE_EMPTY_DIRECTORIES))
526 return show_directory;
527 if (!read_directory_recursive(dir, dirname, len, 1, simplify))
528 return ignore_directory;
529 return show_directory;
530 }
531
532 /*
533 * This is an inexact early pruning of any recursive directory
534 * reading - if the path cannot possibly be in the pathspec,
535 * return true, and we'll skip it early.
536 */
537 static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify)
538 {
539 if (simplify) {
540 for (;;) {
541 const char *match = simplify->path;
542 int len = simplify->len;
543
544 if (!match)
545 break;
546 if (len > pathlen)
547 len = pathlen;
548 if (!memcmp(path, match, len))
549 return 0;
550 simplify++;
551 }
552 return 1;
553 }
554 return 0;
555 }
556
557 static int in_pathspec(const char *path, int len, const struct path_simplify *simplify)
558 {
559 if (simplify) {
560 for (; simplify->path; simplify++) {
561 if (len == simplify->len
562 && !memcmp(path, simplify->path, len))
563 return 1;
564 }
565 }
566 return 0;
567 }
568
569 static int get_index_dtype(const char *path, int len)
570 {
571 int pos;
572 struct cache_entry *ce;
573
574 ce = cache_name_exists(path, len, 0);
575 if (ce) {
576 if (!ce_uptodate(ce))
577 return DT_UNKNOWN;
578 if (S_ISGITLINK(ce->ce_mode))
579 return DT_DIR;
580 /*
581 * Nobody actually cares about the
582 * difference between DT_LNK and DT_REG
583 */
584 return DT_REG;
585 }
586
587 /* Try to look it up as a directory */
588 pos = cache_name_pos(path, len);
589 if (pos >= 0)
590 return DT_UNKNOWN;
591 pos = -pos-1;
592 while (pos < active_nr) {
593 ce = active_cache[pos++];
594 if (strncmp(ce->name, path, len))
595 break;
596 if (ce->name[len] > '/')
597 break;
598 if (ce->name[len] < '/')
599 continue;
600 if (!ce_uptodate(ce))
601 break; /* continue? */
602 return DT_DIR;
603 }
604 return DT_UNKNOWN;
605 }
606
607 static int get_dtype(struct dirent *de, const char *path, int len)
608 {
609 int dtype = de ? DTYPE(de) : DT_UNKNOWN;
610 struct stat st;
611
612 if (dtype != DT_UNKNOWN)
613 return dtype;
614 dtype = get_index_dtype(path, len);
615 if (dtype != DT_UNKNOWN)
616 return dtype;
617 if (lstat(path, &st))
618 return dtype;
619 if (S_ISREG(st.st_mode))
620 return DT_REG;
621 if (S_ISDIR(st.st_mode))
622 return DT_DIR;
623 if (S_ISLNK(st.st_mode))
624 return DT_LNK;
625 return dtype;
626 }
627
628 enum path_treatment {
629 path_ignored,
630 path_handled,
631 path_recurse,
632 };
633
634 static enum path_treatment treat_path(struct dir_struct *dir,
635 struct dirent *de,
636 char *path, int path_max,
637 int baselen,
638 const struct path_simplify *simplify,
639 int *len)
640 {
641 int dtype, exclude;
642
643 if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git"))
644 return path_ignored;
645 *len = strlen(de->d_name);
646 /* Ignore overly long pathnames! */
647 if (*len + baselen + 8 > path_max)
648 return path_ignored;
649 memcpy(path + baselen, de->d_name, *len + 1);
650 *len += baselen;
651 if (simplify_away(path, *len, simplify))
652 return path_ignored;
653
654 dtype = DTYPE(de);
655 exclude = excluded(dir, path, &dtype);
656 if (exclude && (dir->flags & DIR_COLLECT_IGNORED)
657 && in_pathspec(path, *len, simplify))
658 dir_add_ignored(dir, path, *len);
659
660 /*
661 * Excluded? If we don't explicitly want to show
662 * ignored files, ignore it
663 */
664 if (exclude && !(dir->flags & DIR_SHOW_IGNORED))
665 return path_ignored;
666
667 if (dtype == DT_UNKNOWN)
668 dtype = get_dtype(de, path, *len);
669
670 /*
671 * Do we want to see just the ignored files?
672 * We still need to recurse into directories,
673 * even if we don't ignore them, since the
674 * directory may contain files that we do..
675 */
676 if (!exclude && (dir->flags & DIR_SHOW_IGNORED)) {
677 if (dtype != DT_DIR)
678 return path_ignored;
679 }
680
681 switch (dtype) {
682 default:
683 return path_ignored;
684 case DT_DIR:
685 memcpy(path + *len, "/", 2);
686 (*len)++;
687 switch (treat_directory(dir, path, *len, simplify)) {
688 case show_directory:
689 if (exclude != !!(dir->flags
690 & DIR_SHOW_IGNORED))
691 return path_ignored;
692 break;
693 case recurse_into_directory:
694 return path_recurse;
695 case ignore_directory:
696 return path_ignored;
697 }
698 break;
699 case DT_REG:
700 case DT_LNK:
701 break;
702 }
703 return path_handled;
704 }
705
706 /*
707 * Read a directory tree. We currently ignore anything but
708 * directories, regular files and symlinks. That's because git
709 * doesn't handle them at all yet. Maybe that will change some
710 * day.
711 *
712 * Also, we ignore the name ".git" (even if it is not a directory).
713 * That likely will not change.
714 */
715 static int read_directory_recursive(struct dir_struct *dir,
716 const char *base, int baselen,
717 int check_only,
718 const struct path_simplify *simplify)
719 {
720 DIR *fdir = opendir(*base ? base : ".");
721 int contents = 0;
722
723 if (fdir) {
724 struct dirent *de;
725 char path[PATH_MAX + 1];
726 memcpy(path, base, baselen);
727
728 while ((de = readdir(fdir)) != NULL) {
729 int len;
730 switch (treat_path(dir, de, path, sizeof(path),
731 baselen, simplify, &len)) {
732 case path_recurse:
733 contents += read_directory_recursive
734 (dir, path, len, 0, simplify);
735 continue;
736 case path_ignored:
737 continue;
738 case path_handled:
739 break;
740 }
741 contents++;
742 if (check_only)
743 goto exit_early;
744 else
745 dir_add_name(dir, path, len);
746 }
747 exit_early:
748 closedir(fdir);
749 }
750
751 return contents;
752 }
753
754 static int cmp_name(const void *p1, const void *p2)
755 {
756 const struct dir_entry *e1 = *(const struct dir_entry **)p1;
757 const struct dir_entry *e2 = *(const struct dir_entry **)p2;
758
759 return cache_name_compare(e1->name, e1->len,
760 e2->name, e2->len);
761 }
762
763 /*
764 * Return the length of the "simple" part of a path match limiter.
765 */
766 static int simple_length(const char *match)
767 {
768 int len = -1;
769
770 for (;;) {
771 unsigned char c = *match++;
772 len++;
773 if (c == '\0' || is_glob_special(c))
774 return len;
775 }
776 }
777
778 static struct path_simplify *create_simplify(const char **pathspec)
779 {
780 int nr, alloc = 0;
781 struct path_simplify *simplify = NULL;
782
783 if (!pathspec)
784 return NULL;
785
786 for (nr = 0 ; ; nr++) {
787 const char *match;
788 if (nr >= alloc) {
789 alloc = alloc_nr(alloc);
790 simplify = xrealloc(simplify, alloc * sizeof(*simplify));
791 }
792 match = *pathspec++;
793 if (!match)
794 break;
795 simplify[nr].path = match;
796 simplify[nr].len = simple_length(match);
797 }
798 simplify[nr].path = NULL;
799 simplify[nr].len = 0;
800 return simplify;
801 }
802
803 static void free_simplify(struct path_simplify *simplify)
804 {
805 free(simplify);
806 }
807
808 int read_directory(struct dir_struct *dir, const char *path, int len, const char **pathspec)
809 {
810 struct path_simplify *simplify;
811
812 if (has_symlink_leading_path(path, len))
813 return dir->nr;
814
815 simplify = create_simplify(pathspec);
816 read_directory_recursive(dir, path, len, 0, simplify);
817 free_simplify(simplify);
818 qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
819 qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
820 return dir->nr;
821 }
822
823 int file_exists(const char *f)
824 {
825 struct stat sb;
826 return lstat(f, &sb) == 0;
827 }
828
829 /*
830 * get_relative_cwd() gets the prefix of the current working directory
831 * relative to 'dir'. If we are not inside 'dir', it returns NULL.
832 *
833 * As a convenience, it also returns NULL if 'dir' is already NULL. The
834 * reason for this behaviour is that it is natural for functions returning
835 * directory names to return NULL to say "this directory does not exist"
836 * or "this directory is invalid". These cases are usually handled the
837 * same as if the cwd is not inside 'dir' at all, so get_relative_cwd()
838 * returns NULL for both of them.
839 *
840 * Most notably, get_relative_cwd(buffer, size, get_git_work_tree())
841 * unifies the handling of "outside work tree" with "no work tree at all".
842 */
843 char *get_relative_cwd(char *buffer, int size, const char *dir)
844 {
845 char *cwd = buffer;
846
847 if (!dir)
848 return NULL;
849 if (!getcwd(buffer, size))
850 die_errno("can't find the current directory");
851
852 if (!is_absolute_path(dir))
853 dir = make_absolute_path(dir);
854
855 while (*dir && *dir == *cwd) {
856 dir++;
857 cwd++;
858 }
859 if (*dir)
860 return NULL;
861 if (*cwd == '/')
862 return cwd + 1;
863 return cwd;
864 }
865
866 int is_inside_dir(const char *dir)
867 {
868 char buffer[PATH_MAX];
869 return get_relative_cwd(buffer, sizeof(buffer), dir) != NULL;
870 }
871
872 int is_empty_dir(const char *path)
873 {
874 DIR *dir = opendir(path);
875 struct dirent *e;
876 int ret = 1;
877
878 if (!dir)
879 return 0;
880
881 while ((e = readdir(dir)) != NULL)
882 if (!is_dot_or_dotdot(e->d_name)) {
883 ret = 0;
884 break;
885 }
886
887 closedir(dir);
888 return ret;
889 }
890
891 int remove_dir_recursively(struct strbuf *path, int flag)
892 {
893 DIR *dir;
894 struct dirent *e;
895 int ret = 0, original_len = path->len, len;
896 int only_empty = (flag & REMOVE_DIR_EMPTY_ONLY);
897 unsigned char submodule_head[20];
898
899 if ((flag & REMOVE_DIR_KEEP_NESTED_GIT) &&
900 !resolve_gitlink_ref(path->buf, "HEAD", submodule_head))
901 /* Do not descend and nuke a nested git work tree. */
902 return 0;
903
904 dir = opendir(path->buf);
905 if (!dir)
906 return -1;
907 if (path->buf[original_len - 1] != '/')
908 strbuf_addch(path, '/');
909
910 len = path->len;
911 while ((e = readdir(dir)) != NULL) {
912 struct stat st;
913 if (is_dot_or_dotdot(e->d_name))
914 continue;
915
916 strbuf_setlen(path, len);
917 strbuf_addstr(path, e->d_name);
918 if (lstat(path->buf, &st))
919 ; /* fall thru */
920 else if (S_ISDIR(st.st_mode)) {
921 if (!remove_dir_recursively(path, only_empty))
922 continue; /* happy */
923 } else if (!only_empty && !unlink(path->buf))
924 continue; /* happy, too */
925
926 /* path too long, stat fails, or non-directory still exists */
927 ret = -1;
928 break;
929 }
930 closedir(dir);
931
932 strbuf_setlen(path, original_len);
933 if (!ret)
934 ret = rmdir(path->buf);
935 return ret;
936 }
937
938 void setup_standard_excludes(struct dir_struct *dir)
939 {
940 const char *path;
941
942 dir->exclude_per_dir = ".gitignore";
943 path = git_path("info/exclude");
944 if (!access(path, R_OK))
945 add_excludes_from_file(dir, path);
946 if (excludes_file && !access(excludes_file, R_OK))
947 add_excludes_from_file(dir, excludes_file);
948 }
949
950 int remove_path(const char *name)
951 {
952 char *slash;
953
954 if (unlink(name) && errno != ENOENT)
955 return -1;
956
957 slash = strrchr(name, '/');
958 if (slash) {
959 char *dirs = xstrdup(name);
960 slash = dirs + (slash - name);
961 do {
962 *slash = '\0';
963 } while (rmdir(dirs) && (slash = strrchr(dirs, '/')));
964 free(dirs);
965 }
966 return 0;
967 }
968