Use sensible domain name (the DNS one) when guessing ident information
[git.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 #include "quote.h"
13
14 static int show_deleted = 0;
15 static int show_cached = 0;
16 static int show_others = 0;
17 static int show_ignored = 0;
18 static int show_stage = 0;
19 static int show_unmerged = 0;
20 static int show_modified = 0;
21 static int show_killed = 0;
22 static int line_terminator = '\n';
23
24 static int prefix_len = 0, prefix_offset = 0;
25 static const char *prefix = NULL;
26 static const char **pathspec = NULL;
27
28 static const char *tag_cached = "";
29 static const char *tag_unmerged = "";
30 static const char *tag_removed = "";
31 static const char *tag_other = "";
32 static const char *tag_killed = "";
33 static const char *tag_modified = "";
34
35 static const char *exclude_per_dir = NULL;
36
37 /* We maintain three exclude pattern lists:
38  * EXC_CMDL lists patterns explicitly given on the command line.
39  * EXC_DIRS lists patterns obtained from per-directory ignore files.
40  * EXC_FILE lists patterns from fallback ignore files.
41  */
42 #define EXC_CMDL 0
43 #define EXC_DIRS 1
44 #define EXC_FILE 2
45 static struct exclude_list {
46         int nr;
47         int alloc;
48         struct exclude {
49                 const char *pattern;
50                 const char *base;
51                 int baselen;
52         } **excludes;
53 } exclude_list[3];
54
55 static void add_exclude(const char *string, const char *base,
56                         int baselen, struct exclude_list *which)
57 {
58         struct exclude *x = xmalloc(sizeof (*x));
59
60         x->pattern = string;
61         x->base = base;
62         x->baselen = baselen;
63         if (which->nr == which->alloc) {
64                 which->alloc = alloc_nr(which->alloc);
65                 which->excludes = realloc(which->excludes,
66                                           which->alloc * sizeof(x));
67         }
68         which->excludes[which->nr++] = x;
69 }
70
71 static int add_excludes_from_file_1(const char *fname,
72                                     const char *base,
73                                     int baselen,
74                                     struct exclude_list *which)
75 {
76         int fd, i;
77         long size;
78         char *buf, *entry;
79
80         fd = open(fname, O_RDONLY);
81         if (fd < 0)
82                 goto err;
83         size = lseek(fd, 0, SEEK_END);
84         if (size < 0)
85                 goto err;
86         lseek(fd, 0, SEEK_SET);
87         if (size == 0) {
88                 close(fd);
89                 return 0;
90         }
91         buf = xmalloc(size);
92         if (read(fd, buf, size) != size)
93                 goto err;
94         close(fd);
95
96         entry = buf;
97         for (i = 0; i < size; i++) {
98                 if (buf[i] == '\n') {
99                         if (entry != buf + i && entry[0] != '#') {
100                                 buf[i] = 0;
101                                 add_exclude(entry, base, baselen, which);
102                         }
103                         entry = buf + i + 1;
104                 }
105         }
106         return 0;
107
108  err:
109         if (0 <= fd)
110                 close(fd);
111         return -1;
112 }
113
114 static void add_excludes_from_file(const char *fname)
115 {
116         if (add_excludes_from_file_1(fname, "", 0,
117                                      &exclude_list[EXC_FILE]) < 0)
118                 die("cannot use %s as an exclude file", fname);
119 }
120
121 static int push_exclude_per_directory(const char *base, int baselen)
122 {
123         char exclude_file[PATH_MAX];
124         struct exclude_list *el = &exclude_list[EXC_DIRS];
125         int current_nr = el->nr;
126
127         if (exclude_per_dir) {
128                 memcpy(exclude_file, base, baselen);
129                 strcpy(exclude_file + baselen, exclude_per_dir);
130                 add_excludes_from_file_1(exclude_file, base, baselen, el);
131         }
132         return current_nr;
133 }
134
135 static void pop_exclude_per_directory(int stk)
136 {
137         struct exclude_list *el = &exclude_list[EXC_DIRS];
138
139         while (stk < el->nr)
140                 free(el->excludes[--el->nr]);
141 }
142
143 /* Scan the list and let the last match determines the fate.
144  * Return 1 for exclude, 0 for include and -1 for undecided.
145  */
146 static int excluded_1(const char *pathname,
147                       int pathlen,
148                       struct exclude_list *el)
149 {
150         int i;
151
152         if (el->nr) {
153                 for (i = el->nr - 1; 0 <= i; i--) {
154                         struct exclude *x = el->excludes[i];
155                         const char *exclude = x->pattern;
156                         int to_exclude = 1;
157
158                         if (*exclude == '!') {
159                                 to_exclude = 0;
160                                 exclude++;
161                         }
162
163                         if (!strchr(exclude, '/')) {
164                                 /* match basename */
165                                 const char *basename = strrchr(pathname, '/');
166                                 basename = (basename) ? basename+1 : pathname;
167                                 if (fnmatch(exclude, basename, 0) == 0)
168                                         return to_exclude;
169                         }
170                         else {
171                                 /* match with FNM_PATHNAME:
172                                  * exclude has base (baselen long) inplicitly
173                                  * in front of it.
174                                  */
175                                 int baselen = x->baselen;
176                                 if (*exclude == '/')
177                                         exclude++;
178
179                                 if (pathlen < baselen ||
180                                     (baselen && pathname[baselen-1] != '/') ||
181                                     strncmp(pathname, x->base, baselen))
182                                     continue;
183
184                                 if (fnmatch(exclude, pathname+baselen,
185                                             FNM_PATHNAME) == 0)
186                                         return to_exclude;
187                         }
188                 }
189         }
190         return -1; /* undecided */
191 }
192
193 static int excluded(const char *pathname)
194 {
195         int pathlen = strlen(pathname);
196         int st;
197
198         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
199                 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
200                 case 0:
201                         return 0;
202                 case 1:
203                         return 1;
204                 }
205         }
206         return 0;
207 }
208
209 struct nond_on_fs {
210         int len;
211         char name[0];
212 };
213
214 static struct nond_on_fs **dir;
215 static int nr_dir;
216 static int dir_alloc;
217
218 static void add_name(const char *pathname, int len)
219 {
220         struct nond_on_fs *ent;
221
222         if (cache_name_pos(pathname, len) >= 0)
223                 return;
224
225         if (nr_dir == dir_alloc) {
226                 dir_alloc = alloc_nr(dir_alloc);
227                 dir = xrealloc(dir, dir_alloc*sizeof(ent));
228         }
229         ent = xmalloc(sizeof(*ent) + len + 1);
230         ent->len = len;
231         memcpy(ent->name, pathname, len);
232         ent->name[len] = 0;
233         dir[nr_dir++] = ent;
234 }
235
236 /*
237  * Read a directory tree. We currently ignore anything but
238  * directories, regular files and symlinks. That's because git
239  * doesn't handle them at all yet. Maybe that will change some
240  * day.
241  *
242  * Also, we ignore the name ".git" (even if it is not a directory).
243  * That likely will not change.
244  */
245 static void read_directory(const char *path, const char *base, int baselen)
246 {
247         DIR *dir = opendir(path);
248
249         if (dir) {
250                 int exclude_stk;
251                 struct dirent *de;
252                 char fullname[MAXPATHLEN + 1];
253                 memcpy(fullname, base, baselen);
254
255                 exclude_stk = push_exclude_per_directory(base, baselen);
256
257                 while ((de = readdir(dir)) != NULL) {
258                         int len;
259
260                         if ((de->d_name[0] == '.') &&
261                             (de->d_name[1] == 0 ||
262                              !strcmp(de->d_name + 1, ".") ||
263                              !strcmp(de->d_name + 1, "git")))
264                                 continue;
265                         len = strlen(de->d_name);
266                         memcpy(fullname + baselen, de->d_name, len+1);
267                         if (excluded(fullname) != show_ignored)
268                                 continue;
269
270                         switch (DTYPE(de)) {
271                         struct stat st;
272                         default:
273                                 continue;
274                         case DT_UNKNOWN:
275                                 if (lstat(fullname, &st))
276                                         continue;
277                                 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
278                                         break;
279                                 if (!S_ISDIR(st.st_mode))
280                                         continue;
281                                 /* fallthrough */
282                         case DT_DIR:
283                                 memcpy(fullname + baselen + len, "/", 2);
284                                 read_directory(fullname, fullname,
285                                                baselen + len + 1);
286                                 continue;
287                         case DT_REG:
288                         case DT_LNK:
289                                 break;
290                         }
291                         add_name(fullname, baselen + len);
292                 }
293                 closedir(dir);
294
295                 pop_exclude_per_directory(exclude_stk);
296         }
297 }
298
299 static int cmp_name(const void *p1, const void *p2)
300 {
301         const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
302         const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
303
304         return cache_name_compare(e1->name, e1->len,
305                                   e2->name, e2->len);
306 }
307
308 /*
309  * Match a pathspec against a filename. The first "len" characters
310  * are the common prefix
311  */
312 static int match(const char **spec, const char *filename, int len)
313 {
314         const char *m;
315
316         while ((m = *spec++) != NULL) {
317                 int matchlen = strlen(m + len);
318
319                 if (!matchlen)
320                         return 1;
321                 if (!strncmp(m + len, filename + len, matchlen)) {
322                         if (m[len + matchlen - 1] == '/')
323                                 return 1;
324                         switch (filename[len + matchlen]) {
325                         case '/': case '\0':
326                                 return 1;
327                         }
328                 }
329                 if (!fnmatch(m + len, filename + len, 0))
330                         return 1;
331         }
332         return 0;
333 }
334
335 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
336 {
337         int len = prefix_len;
338         int offset = prefix_offset;
339
340         if (len >= ent->len)
341                 die("git-ls-files: internal error - directory entry not superset of prefix");
342
343         if (pathspec && !match(pathspec, ent->name, len))
344                 return;
345
346         fputs(tag, stdout);
347         write_name_quoted("", ent->name + offset, line_terminator, stdout);
348         putchar(line_terminator);
349 }
350
351 static void show_killed_files(void)
352 {
353         int i;
354         for (i = 0; i < nr_dir; i++) {
355                 struct nond_on_fs *ent = dir[i];
356                 char *cp, *sp;
357                 int pos, len, killed = 0;
358
359                 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
360                         sp = strchr(cp, '/');
361                         if (!sp) {
362                                 /* If ent->name is prefix of an entry in the
363                                  * cache, it will be killed.
364                                  */
365                                 pos = cache_name_pos(ent->name, ent->len);
366                                 if (0 <= pos)
367                                         die("bug in show-killed-files");
368                                 pos = -pos - 1;
369                                 while (pos < active_nr &&
370                                        ce_stage(active_cache[pos]))
371                                         pos++; /* skip unmerged */
372                                 if (active_nr <= pos)
373                                         break;
374                                 /* pos points at a name immediately after
375                                  * ent->name in the cache.  Does it expect
376                                  * ent->name to be a directory?
377                                  */
378                                 len = ce_namelen(active_cache[pos]);
379                                 if ((ent->len < len) &&
380                                     !strncmp(active_cache[pos]->name,
381                                              ent->name, ent->len) &&
382                                     active_cache[pos]->name[ent->len] == '/')
383                                         killed = 1;
384                                 break;
385                         }
386                         if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
387                                 /* If any of the leading directories in
388                                  * ent->name is registered in the cache,
389                                  * ent->name will be killed.
390                                  */
391                                 killed = 1;
392                                 break;
393                         }
394                 }
395                 if (killed)
396                         show_dir_entry(tag_killed, dir[i]);
397         }
398 }
399
400 static void show_ce_entry(const char *tag, struct cache_entry *ce)
401 {
402         int len = prefix_len;
403         int offset = prefix_offset;
404
405         if (len >= ce_namelen(ce))
406                 die("git-ls-files: internal error - cache entry not superset of prefix");
407
408         if (pathspec && !match(pathspec, ce->name, len))
409                 return;
410
411         if (!show_stage) {
412                 fputs(tag, stdout);
413                 write_name_quoted("", ce->name + offset, line_terminator, stdout);
414                 putchar(line_terminator);
415         }
416         else {
417                 printf("%s%06o %s %d\t",
418                        tag,
419                        ntohl(ce->ce_mode),
420                        sha1_to_hex(ce->sha1),
421                        ce_stage(ce));
422                 write_name_quoted("", ce->name + offset, line_terminator, stdout);
423                 putchar(line_terminator);
424         }
425 }
426
427 static void show_files(void)
428 {
429         int i;
430
431         /* For cached/deleted files we don't need to even do the readdir */
432         if (show_others || show_killed) {
433                 const char *path = ".", *base = "";
434                 int baselen = prefix_len;
435
436                 if (baselen)
437                         path = base = prefix;
438                 read_directory(path, base, baselen);
439                 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
440                 if (show_others)
441                         for (i = 0; i < nr_dir; i++)
442                                 show_dir_entry(tag_other, dir[i]);
443                 if (show_killed)
444                         show_killed_files();
445         }
446         if (show_cached | show_stage) {
447                 for (i = 0; i < active_nr; i++) {
448                         struct cache_entry *ce = active_cache[i];
449                         if (excluded(ce->name) != show_ignored)
450                                 continue;
451                         if (show_unmerged && !ce_stage(ce))
452                                 continue;
453                         show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
454                 }
455         }
456         if (show_deleted | show_modified) {
457                 for (i = 0; i < active_nr; i++) {
458                         struct cache_entry *ce = active_cache[i];
459                         struct stat st;
460                         int err;
461                         if (excluded(ce->name) != show_ignored)
462                                 continue;
463                         err = lstat(ce->name, &st);
464                         if (show_deleted && err)
465                                 show_ce_entry(tag_removed, ce);
466                         if (show_modified && ce_modified(ce, &st))
467                                 show_ce_entry(tag_modified, ce);
468                 }
469         }
470 }
471
472 /*
473  * Prune the index to only contain stuff starting with "prefix"
474  */
475 static void prune_cache(void)
476 {
477         int pos = cache_name_pos(prefix, prefix_len);
478         unsigned int first, last;
479
480         if (pos < 0)
481                 pos = -pos-1;
482         active_cache += pos;
483         active_nr -= pos;
484         first = 0;
485         last = active_nr;
486         while (last > first) {
487                 int next = (last + first) >> 1;
488                 struct cache_entry *ce = active_cache[next];
489                 if (!strncmp(ce->name, prefix, prefix_len)) {
490                         first = next+1;
491                         continue;
492                 }
493                 last = next;
494         }
495         active_nr = last;
496 }
497
498 static void verify_pathspec(void)
499 {
500         const char **p, *n, *prev;
501         char *real_prefix;
502         unsigned long max;
503
504         prev = NULL;
505         max = PATH_MAX;
506         for (p = pathspec; (n = *p) != NULL; p++) {
507                 int i, len = 0;
508                 for (i = 0; i < max; i++) {
509                         char c = n[i];
510                         if (prev && prev[i] != c)
511                                 break;
512                         if (!c || c == '*' || c == '?')
513                                 break;
514                         if (c == '/')
515                                 len = i+1;
516                 }
517                 prev = n;
518                 if (len < max) {
519                         max = len;
520                         if (!max)
521                                 break;
522                 }
523         }
524
525         if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
526                 die("git-ls-files: cannot generate relative filenames containing '..'");
527
528         real_prefix = NULL;
529         prefix_len = max;
530         if (max) {
531                 real_prefix = xmalloc(max + 1);
532                 memcpy(real_prefix, prev, max);
533                 real_prefix[max] = 0;
534         }
535         prefix = real_prefix;
536 }
537
538 static const char ls_files_usage[] =
539         "git-ls-files [-z] [-t] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
540         "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
541         "[ --exclude-per-directory=<filename> ] [--] [<file>]*";
542
543 int main(int argc, const char **argv)
544 {
545         int i;
546         int exc_given = 0;
547
548         prefix = setup_git_directory();
549         if (prefix)
550                 prefix_offset = strlen(prefix);
551
552         for (i = 1; i < argc; i++) {
553                 const char *arg = argv[i];
554
555                 if (!strcmp(arg, "--")) {
556                         i++;
557                         break;
558                 }
559                 if (!strcmp(arg, "-z")) {
560                         line_terminator = 0;
561                         continue;
562                 }
563                 if (!strcmp(arg, "-t")) {
564                         tag_cached = "H ";
565                         tag_unmerged = "M ";
566                         tag_removed = "R ";
567                         tag_modified = "C ";
568                         tag_other = "? ";
569                         tag_killed = "K ";
570                         continue;
571                 }
572                 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
573                         show_cached = 1;
574                         continue;
575                 }
576                 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
577                         show_deleted = 1;
578                         continue;
579                 }
580                 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
581                         show_modified = 1;
582                         continue;
583                 }
584                 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
585                         show_others = 1;
586                         continue;
587                 }
588                 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
589                         show_ignored = 1;
590                         continue;
591                 }
592                 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
593                         show_stage = 1;
594                         continue;
595                 }
596                 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
597                         show_killed = 1;
598                         continue;
599                 }
600                 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
601                         /* There's no point in showing unmerged unless
602                          * you also show the stage information.
603                          */
604                         show_stage = 1;
605                         show_unmerged = 1;
606                         continue;
607                 }
608                 if (!strcmp(arg, "-x") && i+1 < argc) {
609                         exc_given = 1;
610                         add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
611                         continue;
612                 }
613                 if (!strncmp(arg, "--exclude=", 10)) {
614                         exc_given = 1;
615                         add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
616                         continue;
617                 }
618                 if (!strcmp(arg, "-X") && i+1 < argc) {
619                         exc_given = 1;
620                         add_excludes_from_file(argv[++i]);
621                         continue;
622                 }
623                 if (!strncmp(arg, "--exclude-from=", 15)) {
624                         exc_given = 1;
625                         add_excludes_from_file(arg+15);
626                         continue;
627                 }
628                 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
629                         exc_given = 1;
630                         exclude_per_dir = arg + 24;
631                         continue;
632                 }
633                 if (!strcmp(arg, "--full-name")) {
634                         prefix_offset = 0;
635                         continue;
636                 }
637                 if (*arg == '-')
638                         usage(ls_files_usage);
639                 break;
640         }
641
642         pathspec = get_pathspec(prefix, argv + i);
643
644         /* Verify that the pathspec matches the prefix */
645         if (pathspec)
646                 verify_pathspec();
647
648         if (show_ignored && !exc_given) {
649                 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
650                         argv[0]);
651                 exit(1);
652         }
653
654         /* With no flags, we default to showing the cached files */
655         if (!(show_stage | show_deleted | show_others | show_unmerged |
656               show_killed | show_modified))
657                 show_cached = 1;
658
659         read_cache();
660         if (prefix)
661                 prune_cache();
662         show_files();
663         return 0;
664 }