Merge 'fixes' branch.
[git] / ls-files.c
1 /*
2  * This merges the file listing in the directory cache index
3  * with the actual working directory list, and shows different
4  * combinations of the two.
5  *
6  * Copyright (C) Linus Torvalds, 2005
7  */
8 #include <dirent.h>
9 #include <fnmatch.h>
10
11 #include "cache.h"
12
13 static int show_deleted = 0;
14 static int show_cached = 0;
15 static int show_others = 0;
16 static int show_ignored = 0;
17 static int show_stage = 0;
18 static int show_unmerged = 0;
19 static int show_modified = 0;
20 static int show_killed = 0;
21 static int line_terminator = '\n';
22
23 static int prefix_len = 0, prefix_offset = 0;
24 static const char *prefix = NULL;
25 static const char **pathspec = NULL;
26
27 static const char *tag_cached = "";
28 static const char *tag_unmerged = "";
29 static const char *tag_removed = "";
30 static const char *tag_other = "";
31 static const char *tag_killed = "";
32 static const char *tag_modified = "";
33
34 static char *exclude_per_dir = NULL;
35
36 /* We maintain three exclude pattern lists:
37  * EXC_CMDL lists patterns explicitly given on the command line.
38  * EXC_DIRS lists patterns obtained from per-directory ignore files.
39  * EXC_FILE lists patterns from fallback ignore files.
40  */
41 #define EXC_CMDL 0
42 #define EXC_DIRS 1
43 #define EXC_FILE 2
44 static struct exclude_list {
45         int nr;
46         int alloc;
47         struct exclude {
48                 const char *pattern;
49                 const char *base;
50                 int baselen;
51         } **excludes;
52 } exclude_list[3];
53
54 static void add_exclude(const char *string, const char *base,
55                         int baselen, struct exclude_list *which)
56 {
57         struct exclude *x = xmalloc(sizeof (*x));
58
59         x->pattern = string;
60         x->base = base;
61         x->baselen = baselen;
62         if (which->nr == which->alloc) {
63                 which->alloc = alloc_nr(which->alloc);
64                 which->excludes = realloc(which->excludes,
65                                           which->alloc * sizeof(x));
66         }
67         which->excludes[which->nr++] = x;
68 }
69
70 static int add_excludes_from_file_1(const char *fname,
71                                     const char *base,
72                                     int baselen,
73                                     struct exclude_list *which)
74 {
75         int fd, i;
76         long size;
77         char *buf, *entry;
78
79         fd = open(fname, O_RDONLY);
80         if (fd < 0)
81                 goto err;
82         size = lseek(fd, 0, SEEK_END);
83         if (size < 0)
84                 goto err;
85         lseek(fd, 0, SEEK_SET);
86         if (size == 0) {
87                 close(fd);
88                 return 0;
89         }
90         buf = xmalloc(size);
91         if (read(fd, buf, size) != size)
92                 goto err;
93         close(fd);
94
95         entry = buf;
96         for (i = 0; i < size; i++) {
97                 if (buf[i] == '\n') {
98                         if (entry != buf + i && entry[0] != '#') {
99                                 buf[i] = 0;
100                                 add_exclude(entry, base, baselen, which);
101                         }
102                         entry = buf + i + 1;
103                 }
104         }
105         return 0;
106
107  err:
108         if (0 <= fd)
109                 close(fd);
110         return -1;
111 }
112
113 static void add_excludes_from_file(const char *fname)
114 {
115         if (add_excludes_from_file_1(fname, "", 0,
116                                      &exclude_list[EXC_FILE]) < 0)
117                 die("cannot use %s as an exclude file", fname);
118 }
119
120 static int push_exclude_per_directory(const char *base, int baselen)
121 {
122         char exclude_file[PATH_MAX];
123         struct exclude_list *el = &exclude_list[EXC_DIRS];
124         int current_nr = el->nr;
125
126         if (exclude_per_dir) {
127                 memcpy(exclude_file, base, baselen);
128                 strcpy(exclude_file + baselen, exclude_per_dir);
129                 add_excludes_from_file_1(exclude_file, base, baselen, el);
130         }
131         return current_nr;
132 }
133
134 static void pop_exclude_per_directory(int stk)
135 {
136         struct exclude_list *el = &exclude_list[EXC_DIRS];
137
138         while (stk < el->nr)
139                 free(el->excludes[--el->nr]);
140 }
141
142 /* Scan the list and let the last match determines the fate.
143  * Return 1 for exclude, 0 for include and -1 for undecided.
144  */
145 static int excluded_1(const char *pathname,
146                       int pathlen,
147                       struct exclude_list *el)
148 {
149         int i;
150
151         if (el->nr) {
152                 for (i = el->nr - 1; 0 <= i; i--) {
153                         struct exclude *x = el->excludes[i];
154                         const char *exclude = x->pattern;
155                         int to_exclude = 1;
156
157                         if (*exclude == '!') {
158                                 to_exclude = 0;
159                                 exclude++;
160                         }
161
162                         if (!strchr(exclude, '/')) {
163                                 /* match basename */
164                                 const char *basename = strrchr(pathname, '/');
165                                 basename = (basename) ? basename+1 : pathname;
166                                 if (fnmatch(exclude, basename, 0) == 0)
167                                         return to_exclude;
168                         }
169                         else {
170                                 /* match with FNM_PATHNAME:
171                                  * exclude has base (baselen long) inplicitly
172                                  * in front of it.
173                                  */
174                                 int baselen = x->baselen;
175                                 if (*exclude == '/')
176                                         exclude++;
177
178                                 if (pathlen < baselen ||
179                                     (baselen && pathname[baselen-1] != '/') ||
180                                     strncmp(pathname, x->base, baselen))
181                                     continue;
182
183                                 if (fnmatch(exclude, pathname+baselen,
184                                             FNM_PATHNAME) == 0)
185                                         return to_exclude;
186                         }
187                 }
188         }
189         return -1; /* undecided */
190 }
191
192 static int excluded(const char *pathname)
193 {
194         int pathlen = strlen(pathname);
195         int st;
196
197         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
198                 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
199                 case 0:
200                         return 0;
201                 case 1:
202                         return 1;
203                 }
204         }
205         return 0;
206 }
207
208 struct nond_on_fs {
209         int len;
210         char name[0];
211 };
212
213 static struct nond_on_fs **dir;
214 static int nr_dir;
215 static int dir_alloc;
216
217 static void add_name(const char *pathname, int len)
218 {
219         struct nond_on_fs *ent;
220
221         if (cache_name_pos(pathname, len) >= 0)
222                 return;
223
224         if (nr_dir == dir_alloc) {
225                 dir_alloc = alloc_nr(dir_alloc);
226                 dir = xrealloc(dir, dir_alloc*sizeof(ent));
227         }
228         ent = xmalloc(sizeof(*ent) + len + 1);
229         ent->len = len;
230         memcpy(ent->name, pathname, len);
231         ent->name[len] = 0;
232         dir[nr_dir++] = ent;
233 }
234
235 /*
236  * Read a directory tree. We currently ignore anything but
237  * directories, regular files and symlinks. That's because git
238  * doesn't handle them at all yet. Maybe that will change some
239  * day.
240  *
241  * Also, we ignore the name ".git" (even if it is not a directory).
242  * That likely will not change.
243  */
244 static void read_directory(const char *path, const char *base, int baselen)
245 {
246         DIR *dir = opendir(path);
247
248         if (dir) {
249                 int exclude_stk;
250                 struct dirent *de;
251                 char fullname[MAXPATHLEN + 1];
252                 memcpy(fullname, base, baselen);
253
254                 exclude_stk = push_exclude_per_directory(base, baselen);
255
256                 while ((de = readdir(dir)) != NULL) {
257                         int len;
258
259                         if ((de->d_name[0] == '.') &&
260                             (de->d_name[1] == 0 ||
261                              !strcmp(de->d_name + 1, ".") ||
262                              !strcmp(de->d_name + 1, "git")))
263                                 continue;
264                         len = strlen(de->d_name);
265                         memcpy(fullname + baselen, de->d_name, len+1);
266                         if (excluded(fullname) != show_ignored)
267                                 continue;
268
269                         switch (DTYPE(de)) {
270                         struct stat st;
271                         default:
272                                 continue;
273                         case DT_UNKNOWN:
274                                 if (lstat(fullname, &st))
275                                         continue;
276                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
277                                         break;
278                                 if (!S_ISDIR(st.st_mode))
279                                         continue;
280                                 /* fallthrough */
281                         case DT_DIR:
282                                 memcpy(fullname + baselen + len, "/", 2);
283                                 read_directory(fullname, fullname,
284                                                baselen + len + 1);
285                                 continue;
286                         case DT_REG:
287                         case DT_LNK:
288                                 break;
289                         }
290                         add_name(fullname, baselen + len);
291                 }
292                 closedir(dir);
293
294                 pop_exclude_per_directory(exclude_stk);
295         }
296 }
297
298 static int cmp_name(const void *p1, const void *p2)
299 {
300         const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
301         const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
302
303         return cache_name_compare(e1->name, e1->len,
304                                   e2->name, e2->len);
305 }
306
307 /*
308  * Match a pathspec against a filename. The first "len" characters
309  * are the common prefix
310  */
311 static int match(const char **spec, const char *filename, int len)
312 {
313         const char *m;
314
315         while ((m = *spec++) != NULL) {
316                 int matchlen = strlen(m + len);
317
318                 if (!matchlen)
319                         return 1;
320                 if (!strncmp(m + len, filename + len, matchlen)) {
321                         if (m[len + matchlen - 1] == '/')
322                                 return 1;
323                         switch (filename[len + matchlen]) {
324                         case '/': case '\0':
325                                 return 1;
326                         }
327                 }
328                 if (!fnmatch(m + len, filename + len, 0))
329                         return 1;
330         }
331         return 0;
332 }
333
334 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
335 {
336         int len = prefix_len;
337         int offset = prefix_offset;
338
339         if (len >= ent->len)
340                 die("git-ls-files: internal error - directory entry not superset of prefix");
341
342         if (pathspec && !match(pathspec, ent->name, len))
343                 return;
344
345         printf("%s%s%c", tag, ent->name + offset, line_terminator);
346 }
347
348 static void show_killed_files(void)
349 {
350         int i;
351         for (i = 0; i < nr_dir; i++) {
352                 struct nond_on_fs *ent = dir[i];
353                 char *cp, *sp;
354                 int pos, len, killed = 0;
355
356                 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
357                         sp = strchr(cp, '/');
358                         if (!sp) {
359                                 /* If ent->name is prefix of an entry in the
360                                  * cache, it will be killed.
361                                  */
362                                 pos = cache_name_pos(ent->name, ent->len);
363                                 if (0 <= pos)
364                                         die("bug in show-killed-files");
365                                 pos = -pos - 1;
366                                 while (pos < active_nr &&
367                                        ce_stage(active_cache[pos]))
368                                         pos++; /* skip unmerged */
369                                 if (active_nr <= pos)
370                                         break;
371                                 /* pos points at a name immediately after
372                                  * ent->name in the cache.  Does it expect
373                                  * ent->name to be a directory?
374                                  */
375                                 len = ce_namelen(active_cache[pos]);
376                                 if ((ent->len < len) &&
377                                     !strncmp(active_cache[pos]->name,
378                                              ent->name, ent->len) &&
379                                     active_cache[pos]->name[ent->len] == '/')
380                                         killed = 1;
381                                 break;
382                         }
383                         if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
384                                 /* If any of the leading directories in
385                                  * ent->name is registered in the cache,
386                                  * ent->name will be killed.
387                                  */
388                                 killed = 1;
389                                 break;
390                         }
391                 }
392                 if (killed)
393                         show_dir_entry(tag_killed, dir[i]);
394         }
395 }
396
397 static void show_ce_entry(const char *tag, struct cache_entry *ce)
398 {
399         int len = prefix_len;
400         int offset = prefix_offset;
401
402         if (len >= ce_namelen(ce))
403                 die("git-ls-files: internal error - cache entry not superset of prefix");
404
405         if (pathspec && !match(pathspec, ce->name, len))
406                 return;
407
408         if (!show_stage)
409                 printf("%s%s%c", tag, ce->name + offset, line_terminator);
410         else
411                 printf("%s%06o %s %d\t%s%c",
412                        tag,
413                        ntohl(ce->ce_mode),
414                        sha1_to_hex(ce->sha1),
415                        ce_stage(ce),
416                        ce->name + offset, line_terminator); 
417 }
418
419 static void show_files(void)
420 {
421         int i;
422
423         /* For cached/deleted files we don't need to even do the readdir */
424         if (show_others || show_killed) {
425                 const char *path = ".", *base = "";
426                 int baselen = prefix_len;
427
428                 if (baselen)
429                         path = base = prefix;
430                 read_directory(path, base, baselen);
431                 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
432                 if (show_others)
433                         for (i = 0; i < nr_dir; i++)
434                                 show_dir_entry(tag_other, dir[i]);
435                 if (show_killed)
436                         show_killed_files();
437         }
438         if (show_cached | show_stage) {
439                 for (i = 0; i < active_nr; i++) {
440                         struct cache_entry *ce = active_cache[i];
441                         if (excluded(ce->name) != show_ignored)
442                                 continue;
443                         if (show_unmerged && !ce_stage(ce))
444                                 continue;
445                         show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
446                 }
447         }
448         if (show_deleted | show_modified) {
449                 for (i = 0; i < active_nr; i++) {
450                         struct cache_entry *ce = active_cache[i];
451                         struct stat st;
452                         int err;
453                         if (excluded(ce->name) != show_ignored)
454                                 continue;
455                         err = lstat(ce->name, &st);
456                         if (show_deleted && err)
457                                 show_ce_entry(tag_removed, ce);
458                         if (show_modified && ce_modified(ce, &st))
459                                 show_ce_entry(tag_modified, ce);
460                 }
461         }
462 }
463
464 /*
465  * Prune the index to only contain stuff starting with "prefix"
466  */
467 static void prune_cache(void)
468 {
469         int pos = cache_name_pos(prefix, prefix_len);
470         unsigned int first, last;
471
472         if (pos < 0)
473                 pos = -pos-1;
474         active_cache += pos;
475         active_nr -= pos;
476         first = 0;
477         last = active_nr;
478         while (last > first) {
479                 int next = (last + first) >> 1;
480                 struct cache_entry *ce = active_cache[next];
481                 if (!strncmp(ce->name, prefix, prefix_len)) {
482                         first = next+1;
483                         continue;
484                 }
485                 last = next;
486         }
487         active_nr = last;
488 }
489
490 static void verify_pathspec(void)
491 {
492         const char **p, *n, *prev;
493         char *real_prefix;
494         unsigned long max;
495
496         prev = NULL;
497         max = PATH_MAX;
498         for (p = pathspec; (n = *p) != NULL; p++) {
499                 int i, len = 0;
500                 for (i = 0; i < max; i++) {
501                         char c = n[i];
502                         if (prev && prev[i] != c)
503                                 break;
504                         if (!c || c == '*' || c == '?')
505                                 break;
506                         if (c == '/')
507                                 len = i+1;
508                 }
509                 prev = n;
510                 if (len < max) {
511                         max = len;
512                         if (!max)
513                                 break;
514                 }
515         }
516
517         if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
518                 die("git-ls-files: cannot generate relative filenames containing '..'");
519
520         real_prefix = NULL;
521         prefix_len = max;
522         if (max) {
523                 real_prefix = xmalloc(max + 1);
524                 memcpy(real_prefix, prev, max);
525                 real_prefix[max] = 0;
526         }
527         prefix = real_prefix;
528 }
529
530 static const char ls_files_usage[] =
531         "git-ls-files [-z] [-t] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
532         "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
533         "[ --exclude-per-directory=<filename> ]";
534
535 int main(int argc, char **argv)
536 {
537         int i;
538         int exc_given = 0;
539
540         prefix = setup_git_directory();
541         if (prefix)
542                 prefix_offset = strlen(prefix);
543
544         for (i = 1; i < argc; i++) {
545                 char *arg = argv[i];
546
547                 if (!strcmp(arg, "-z")) {
548                         line_terminator = 0;
549                         continue;
550                 }
551                 if (!strcmp(arg, "-t")) {
552                         tag_cached = "H ";
553                         tag_unmerged = "M ";
554                         tag_removed = "R ";
555                         tag_modified = "C ";
556                         tag_other = "? ";
557                         tag_killed = "K ";
558                         continue;
559                 }
560                 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
561                         show_cached = 1;
562                         continue;
563                 }
564                 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
565                         show_deleted = 1;
566                         continue;
567                 }
568                 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
569                         show_modified = 1;
570                         continue;
571                 }
572                 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
573                         show_others = 1;
574                         continue;
575                 }
576                 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
577                         show_ignored = 1;
578                         continue;
579                 }
580                 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
581                         show_stage = 1;
582                         continue;
583                 }
584                 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
585                         show_killed = 1;
586                         continue;
587                 }
588                 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
589                         /* There's no point in showing unmerged unless
590                          * you also show the stage information.
591                          */
592                         show_stage = 1;
593                         show_unmerged = 1;
594                         continue;
595                 }
596                 if (!strcmp(arg, "-x") && i+1 < argc) {
597                         exc_given = 1;
598                         add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
599                         continue;
600                 }
601                 if (!strncmp(arg, "--exclude=", 10)) {
602                         exc_given = 1;
603                         add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
604                         continue;
605                 }
606                 if (!strcmp(arg, "-X") && i+1 < argc) {
607                         exc_given = 1;
608                         add_excludes_from_file(argv[++i]);
609                         continue;
610                 }
611                 if (!strncmp(arg, "--exclude-from=", 15)) {
612                         exc_given = 1;
613                         add_excludes_from_file(arg+15);
614                         continue;
615                 }
616                 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
617                         exc_given = 1;
618                         exclude_per_dir = arg + 24;
619                         continue;
620                 }
621                 if (!strcmp(arg, "--full-name")) {
622                         prefix_offset = 0;
623                         continue;
624                 }
625                 if (*arg == '-')
626                         usage(ls_files_usage);
627                 break;
628         }
629
630         pathspec = get_pathspec(prefix, argv + i);
631
632         /* Verify that the pathspec matches the prefix */
633         if (pathspec)
634                 verify_pathspec();
635
636         if (show_ignored && !exc_given) {
637                 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
638                         argv[0]);
639                 exit(1);
640         }
641
642         /* With no flags, we default to showing the cached files */
643         if (!(show_stage | show_deleted | show_others | show_unmerged |
644               show_killed | show_modified))
645                 show_cached = 1;
646
647         read_cache();
648         if (prefix)
649                 prune_cache();
650         show_files();
651         return 0;
652 }