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[git] / builtin-update-index.c
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "strbuf.h"
8 #include "quote.h"
9 #include "cache-tree.h"
10 #include "tree-walk.h"
11 #include "builtin.h"
12
13 /*
14  * Default to not allowing changes to the list of files. The
15  * tool doesn't actually care, but this makes it harder to add
16  * files to the revision control by mistake by doing something
17  * like "git-update-index *" and suddenly having all the object
18  * files be revision controlled.
19  */
20 static int allow_add;
21 static int allow_remove;
22 static int allow_replace;
23 static int info_only;
24 static int force_remove;
25 static int verbose;
26 static int mark_valid_only = 0;
27 #define MARK_VALID 1
28 #define UNMARK_VALID 2
29
30 static void report(const char *fmt, ...)
31 {
32         va_list vp;
33
34         if (!verbose)
35                 return;
36
37         va_start(vp, fmt);
38         vprintf(fmt, vp);
39         putchar('\n');
40         va_end(vp);
41 }
42
43 static int mark_valid(const char *path)
44 {
45         int namelen = strlen(path);
46         int pos = cache_name_pos(path, namelen);
47         if (0 <= pos) {
48                 switch (mark_valid_only) {
49                 case MARK_VALID:
50                         active_cache[pos]->ce_flags |= htons(CE_VALID);
51                         break;
52                 case UNMARK_VALID:
53                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
54                         break;
55                 }
56                 cache_tree_invalidate_path(active_cache_tree, path);
57                 active_cache_changed = 1;
58                 return 0;
59         }
60         return -1;
61 }
62
63 static int add_file_to_cache(const char *path)
64 {
65         int size, namelen, option, status;
66         struct cache_entry *ce;
67         struct stat st;
68
69         status = lstat(path, &st);
70
71         /* We probably want to do this in remove_file_from_cache() and
72          * add_cache_entry() instead...
73          */
74         cache_tree_invalidate_path(active_cache_tree, path);
75
76         if (status < 0 || S_ISDIR(st.st_mode)) {
77                 /* When we used to have "path" and now we want to add
78                  * "path/file", we need a way to remove "path" before
79                  * being able to add "path/file".  However,
80                  * "git-update-index --remove path" would not work.
81                  * --force-remove can be used but this is more user
82                  * friendly, especially since we can do the opposite
83                  * case just fine without --force-remove.
84                  */
85                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
86                         if (allow_remove) {
87                                 if (remove_file_from_cache(path))
88                                         return error("%s: cannot remove from the index",
89                                                      path);
90                                 else
91                                         return 0;
92                         } else if (status < 0) {
93                                 return error("%s: does not exist and --remove not passed",
94                                              path);
95                         }
96                 }
97                 if (0 == status)
98                         return error("%s: is a directory - add files inside instead",
99                                      path);
100                 else
101                         return error("lstat(\"%s\"): %s", path,
102                                      strerror(errno));
103         }
104
105         namelen = strlen(path);
106         size = cache_entry_size(namelen);
107         ce = xcalloc(1, size);
108         memcpy(ce->name, path, namelen);
109         ce->ce_flags = htons(namelen);
110         fill_stat_cache_info(ce, &st);
111
112         ce->ce_mode = create_ce_mode(st.st_mode);
113         if (!trust_executable_bit) {
114                 /* If there is an existing entry, pick the mode bits
115                  * from it.
116                  */
117                 int pos = cache_name_pos(path, namelen);
118                 if (0 <= pos)
119                         ce->ce_mode = active_cache[pos]->ce_mode;
120         }
121
122         if (index_path(ce->sha1, path, &st, !info_only))
123                 return -1;
124         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
125         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
126         if (add_cache_entry(ce, option))
127                 return error("%s: cannot add to the index - missing --add option?",
128                              path);
129         return 0;
130 }
131
132 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
133                          const char *path, int stage)
134 {
135         int size, len, option;
136         struct cache_entry *ce;
137
138         if (!verify_path(path))
139                 return -1;
140
141         len = strlen(path);
142         size = cache_entry_size(len);
143         ce = xcalloc(1, size);
144
145         memcpy(ce->sha1, sha1, 20);
146         memcpy(ce->name, path, len);
147         ce->ce_flags = create_ce_flags(len, stage);
148         ce->ce_mode = create_ce_mode(mode);
149         if (assume_unchanged)
150                 ce->ce_flags |= htons(CE_VALID);
151         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
152         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
153         if (add_cache_entry(ce, option))
154                 return error("%s: cannot add to the index - missing --add option?",
155                              path);
156         report("add '%s'", path);
157         cache_tree_invalidate_path(active_cache_tree, path);
158         return 0;
159 }
160
161 static void chmod_path(int flip, const char *path)
162 {
163         int pos;
164         struct cache_entry *ce;
165         unsigned int mode;
166
167         pos = cache_name_pos(path, strlen(path));
168         if (pos < 0)
169                 goto fail;
170         ce = active_cache[pos];
171         mode = ntohl(ce->ce_mode);
172         if (!S_ISREG(mode))
173                 goto fail;
174         switch (flip) {
175         case '+':
176                 ce->ce_mode |= htonl(0111); break;
177         case '-':
178                 ce->ce_mode &= htonl(~0111); break;
179         default:
180                 goto fail;
181         }
182         cache_tree_invalidate_path(active_cache_tree, path);
183         active_cache_changed = 1;
184         report("chmod %cx '%s'", flip, path);
185         return;
186  fail:
187         die("git-update-index: cannot chmod %cx '%s'", flip, path);
188 }
189
190 static void update_one(const char *path, const char *prefix, int prefix_length)
191 {
192         const char *p = prefix_path(prefix, prefix_length, path);
193         if (!verify_path(p)) {
194                 fprintf(stderr, "Ignoring path %s\n", path);
195                 goto free_return;
196         }
197         if (mark_valid_only) {
198                 if (mark_valid(p))
199                         die("Unable to mark file %s", path);
200                 goto free_return;
201         }
202         cache_tree_invalidate_path(active_cache_tree, path);
203
204         if (force_remove) {
205                 if (remove_file_from_cache(p))
206                         die("git-update-index: unable to remove %s", path);
207                 report("remove '%s'", path);
208                 goto free_return;
209         }
210         if (add_file_to_cache(p))
211                 die("Unable to process file %s", path);
212         report("add '%s'", path);
213  free_return:
214         if (p < path || p > path + strlen(path))
215                 free((char*)p);
216 }
217
218 static void read_index_info(int line_termination)
219 {
220         struct strbuf buf;
221         strbuf_init(&buf);
222         while (1) {
223                 char *ptr, *tab;
224                 char *path_name;
225                 unsigned char sha1[20];
226                 unsigned int mode;
227                 int stage;
228
229                 /* This reads lines formatted in one of three formats:
230                  *
231                  * (1) mode         SP sha1          TAB path
232                  * The first format is what "git-apply --index-info"
233                  * reports, and used to reconstruct a partial tree
234                  * that is used for phony merge base tree when falling
235                  * back on 3-way merge.
236                  *
237                  * (2) mode SP type SP sha1          TAB path
238                  * The second format is to stuff git-ls-tree output
239                  * into the index file.
240                  *
241                  * (3) mode         SP sha1 SP stage TAB path
242                  * This format is to put higher order stages into the
243                  * index file and matches git-ls-files --stage output.
244                  */
245                 read_line(&buf, stdin, line_termination);
246                 if (buf.eof)
247                         break;
248
249                 mode = strtoul(buf.buf, &ptr, 8);
250                 if (ptr == buf.buf || *ptr != ' ')
251                         goto bad_line;
252
253                 tab = strchr(ptr, '\t');
254                 if (!tab || tab - ptr < 41)
255                         goto bad_line;
256
257                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
258                         stage = tab[-1] - '0';
259                         ptr = tab + 1; /* point at the head of path */
260                         tab = tab - 2; /* point at tail of sha1 */
261                 }
262                 else {
263                         stage = 0;
264                         ptr = tab + 1; /* point at the head of path */
265                 }
266
267                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
268                         goto bad_line;
269
270                 if (line_termination && ptr[0] == '"')
271                         path_name = unquote_c_style(ptr, NULL);
272                 else
273                         path_name = ptr;
274
275                 if (!verify_path(path_name)) {
276                         fprintf(stderr, "Ignoring path %s\n", path_name);
277                         if (path_name != ptr)
278                                 free(path_name);
279                         continue;
280                 }
281                 cache_tree_invalidate_path(active_cache_tree, path_name);
282
283                 if (!mode) {
284                         /* mode == 0 means there is no such path -- remove */
285                         if (remove_file_from_cache(path_name))
286                                 die("git-update-index: unable to remove %s",
287                                     ptr);
288                 }
289                 else {
290                         /* mode ' ' sha1 '\t' name
291                          * ptr[-1] points at tab,
292                          * ptr[-41] is at the beginning of sha1
293                          */
294                         ptr[-42] = ptr[-1] = 0;
295                         if (add_cacheinfo(mode, sha1, path_name, stage))
296                                 die("git-update-index: unable to update %s",
297                                     path_name);
298                 }
299                 if (path_name != ptr)
300                         free(path_name);
301                 continue;
302
303         bad_line:
304                 die("malformed index info %s", buf.buf);
305         }
306 }
307
308 static const char update_index_usage[] =
309 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--again] [--ignore-missing] [-z] [--verbose] [--] <file>...";
310
311 static unsigned char head_sha1[20];
312 static unsigned char merge_head_sha1[20];
313
314 static struct cache_entry *read_one_ent(const char *which,
315                                         unsigned char *ent, const char *path,
316                                         int namelen, int stage)
317 {
318         unsigned mode;
319         unsigned char sha1[20];
320         int size;
321         struct cache_entry *ce;
322
323         if (get_tree_entry(ent, path, sha1, &mode)) {
324                 if (which)
325                         error("%s: not in %s branch.", path, which);
326                 return NULL;
327         }
328         if (mode == S_IFDIR) {
329                 if (which)
330                         error("%s: not a blob in %s branch.", path, which);
331                 return NULL;
332         }
333         size = cache_entry_size(namelen);
334         ce = xcalloc(1, size);
335
336         memcpy(ce->sha1, sha1, 20);
337         memcpy(ce->name, path, namelen);
338         ce->ce_flags = create_ce_flags(namelen, stage);
339         ce->ce_mode = create_ce_mode(mode);
340         return ce;
341 }
342
343 static int unresolve_one(const char *path)
344 {
345         int namelen = strlen(path);
346         int pos;
347         int ret = 0;
348         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
349
350         /* See if there is such entry in the index. */
351         pos = cache_name_pos(path, namelen);
352         if (pos < 0) {
353                 /* If there isn't, either it is unmerged, or
354                  * resolved as "removed" by mistake.  We do not
355                  * want to do anything in the former case.
356                  */
357                 pos = -pos-1;
358                 if (pos < active_nr) {
359                         struct cache_entry *ce = active_cache[pos];
360                         if (ce_namelen(ce) == namelen &&
361                             !memcmp(ce->name, path, namelen)) {
362                                 fprintf(stderr,
363                                         "%s: skipping still unmerged path.\n",
364                                         path);
365                                 goto free_return;
366                         }
367                 }
368         }
369
370         /* Grab blobs from given path from HEAD and MERGE_HEAD,
371          * stuff HEAD version in stage #2,
372          * stuff MERGE_HEAD version in stage #3.
373          */
374         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
375         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
376
377         if (!ce_2 || !ce_3) {
378                 ret = -1;
379                 goto free_return;
380         }
381         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
382             ce_2->ce_mode == ce_3->ce_mode) {
383                 fprintf(stderr, "%s: identical in both, skipping.\n",
384                         path);
385                 goto free_return;
386         }
387
388         cache_tree_invalidate_path(active_cache_tree, path);
389         remove_file_from_cache(path);
390         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
391                 error("%s: cannot add our version to the index.", path);
392                 ret = -1;
393                 goto free_return;
394         }
395         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
396                 return 0;
397         error("%s: cannot add their version to the index.", path);
398         ret = -1;
399  free_return:
400         free(ce_2);
401         free(ce_3);
402         return ret;
403 }
404
405 static void read_head_pointers(void)
406 {
407         if (read_ref(git_path("HEAD"), head_sha1))
408                 die("No HEAD -- no initial commit yet?\n");
409         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
410                 fprintf(stderr, "Not in the middle of a merge.\n");
411                 exit(0);
412         }
413 }
414
415 static int do_unresolve(int ac, const char **av,
416                         const char *prefix, int prefix_length)
417 {
418         int i;
419         int err = 0;
420
421         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
422          * are not doing a merge, so exit with success status.
423          */
424         read_head_pointers();
425
426         for (i = 1; i < ac; i++) {
427                 const char *arg = av[i];
428                 const char *p = prefix_path(prefix, prefix_length, arg);
429                 err |= unresolve_one(p);
430                 if (p < arg || p > arg + strlen(arg))
431                         free((char*)p);
432         }
433         return err;
434 }
435
436 static int do_reupdate(int ac, const char **av,
437                        const char *prefix, int prefix_length)
438 {
439         /* Read HEAD and run update-index on paths that are
440          * merged and already different between index and HEAD.
441          */
442         int pos;
443         int has_head = 1;
444         const char **pathspec = get_pathspec(prefix, av + 1);
445
446         if (read_ref(git_path("HEAD"), head_sha1))
447                 /* If there is no HEAD, that means it is an initial
448                  * commit.  Update everything in the index.
449                  */
450                 has_head = 0;
451  redo:
452         for (pos = 0; pos < active_nr; pos++) {
453                 struct cache_entry *ce = active_cache[pos];
454                 struct cache_entry *old = NULL;
455                 int save_nr;
456
457                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
458                         continue;
459                 if (has_head)
460                         old = read_one_ent(NULL, head_sha1,
461                                            ce->name, ce_namelen(ce), 0);
462                 if (old && ce->ce_mode == old->ce_mode &&
463                     !memcmp(ce->sha1, old->sha1, 20)) {
464                         free(old);
465                         continue; /* unchanged */
466                 }
467                 /* Be careful.  The working tree may not have the
468                  * path anymore, in which case, under 'allow_remove',
469                  * or worse yet 'allow_replace', active_nr may decrease.
470                  */
471                 save_nr = active_nr;
472                 update_one(ce->name + prefix_length, prefix, prefix_length);
473                 if (save_nr != active_nr)
474                         goto redo;
475         }
476         return 0;
477 }
478
479 int cmd_update_index(int argc, const char **argv, const char *prefix)
480 {
481         int i, newfd, entries, has_errors = 0, line_termination = '\n';
482         int allow_options = 1;
483         int read_from_stdin = 0;
484         int prefix_length = prefix ? strlen(prefix) : 0;
485         char set_executable_bit = 0;
486         unsigned int refresh_flags = 0;
487         struct lock_file *lock_file;
488
489         git_config(git_default_config);
490
491         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
492         lock_file = xcalloc(1, sizeof(struct lock_file));
493
494         newfd = hold_lock_file_for_update(lock_file, get_index_file(), 1);
495
496         entries = read_cache();
497         if (entries < 0)
498                 die("cache corrupted");
499
500         for (i = 1 ; i < argc; i++) {
501                 const char *path = argv[i];
502
503                 if (allow_options && *path == '-') {
504                         if (!strcmp(path, "--")) {
505                                 allow_options = 0;
506                                 continue;
507                         }
508                         if (!strcmp(path, "-q")) {
509                                 refresh_flags |= REFRESH_QUIET;
510                                 continue;
511                         }
512                         if (!strcmp(path, "--add")) {
513                                 allow_add = 1;
514                                 continue;
515                         }
516                         if (!strcmp(path, "--replace")) {
517                                 allow_replace = 1;
518                                 continue;
519                         }
520                         if (!strcmp(path, "--remove")) {
521                                 allow_remove = 1;
522                                 continue;
523                         }
524                         if (!strcmp(path, "--unmerged")) {
525                                 refresh_flags |= REFRESH_UNMERGED;
526                                 continue;
527                         }
528                         if (!strcmp(path, "--refresh")) {
529                                 has_errors |= refresh_cache(refresh_flags);
530                                 continue;
531                         }
532                         if (!strcmp(path, "--really-refresh")) {
533                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
534                                 continue;
535                         }
536                         if (!strcmp(path, "--cacheinfo")) {
537                                 unsigned char sha1[20];
538                                 unsigned int mode;
539
540                                 if (i+3 >= argc)
541                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
542
543                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
544                                     get_sha1_hex(argv[i+2], sha1) ||
545                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
546                                         die("git-update-index: --cacheinfo"
547                                             " cannot add %s", argv[i+3]);
548                                 i += 3;
549                                 continue;
550                         }
551                         if (!strcmp(path, "--chmod=-x") ||
552                             !strcmp(path, "--chmod=+x")) {
553                                 if (argc <= i+1)
554                                         die("git-update-index: %s <path>", path);
555                                 set_executable_bit = path[8];
556                                 continue;
557                         }
558                         if (!strcmp(path, "--assume-unchanged")) {
559                                 mark_valid_only = MARK_VALID;
560                                 continue;
561                         }
562                         if (!strcmp(path, "--no-assume-unchanged")) {
563                                 mark_valid_only = UNMARK_VALID;
564                                 continue;
565                         }
566                         if (!strcmp(path, "--info-only")) {
567                                 info_only = 1;
568                                 continue;
569                         }
570                         if (!strcmp(path, "--force-remove")) {
571                                 force_remove = 1;
572                                 continue;
573                         }
574                         if (!strcmp(path, "-z")) {
575                                 line_termination = 0;
576                                 continue;
577                         }
578                         if (!strcmp(path, "--stdin")) {
579                                 if (i != argc - 1)
580                                         die("--stdin must be at the end");
581                                 read_from_stdin = 1;
582                                 break;
583                         }
584                         if (!strcmp(path, "--index-info")) {
585                                 if (i != argc - 1)
586                                         die("--index-info must be at the end");
587                                 allow_add = allow_replace = allow_remove = 1;
588                                 read_index_info(line_termination);
589                                 break;
590                         }
591                         if (!strcmp(path, "--unresolve")) {
592                                 has_errors = do_unresolve(argc - i, argv + i,
593                                                           prefix, prefix_length);
594                                 if (has_errors)
595                                         active_cache_changed = 0;
596                                 goto finish;
597                         }
598                         if (!strcmp(path, "--again")) {
599                                 has_errors = do_reupdate(argc - i, argv + i,
600                                                          prefix, prefix_length);
601                                 if (has_errors)
602                                         active_cache_changed = 0;
603                                 goto finish;
604                         }
605                         if (!strcmp(path, "--ignore-missing")) {
606                                 refresh_flags |= REFRESH_IGNORE_MISSING;
607                                 continue;
608                         }
609                         if (!strcmp(path, "--verbose")) {
610                                 verbose = 1;
611                                 continue;
612                         }
613                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
614                                 usage(update_index_usage);
615                         die("unknown option %s", path);
616                 }
617                 update_one(path, prefix, prefix_length);
618                 if (set_executable_bit)
619                         chmod_path(set_executable_bit, path);
620         }
621         if (read_from_stdin) {
622                 struct strbuf buf;
623                 strbuf_init(&buf);
624                 while (1) {
625                         char *path_name;
626                         const char *p;
627                         read_line(&buf, stdin, line_termination);
628                         if (buf.eof)
629                                 break;
630                         if (line_termination && buf.buf[0] == '"')
631                                 path_name = unquote_c_style(buf.buf, NULL);
632                         else
633                                 path_name = buf.buf;
634                         p = prefix_path(prefix, prefix_length, path_name);
635                         update_one(p, NULL, 0);
636                         if (set_executable_bit)
637                                 chmod_path(set_executable_bit, p);
638                         if (p < path_name || p > path_name + strlen(path_name))
639                                 free((char*) p);
640                         if (path_name != buf.buf)
641                                 free(path_name);
642                 }
643         }
644
645  finish:
646         if (active_cache_changed) {
647                 if (write_cache(newfd, active_cache, active_nr) ||
648                     close(newfd) || commit_lock_file(lock_file))
649                         die("Unable to write new index file");
650         }
651
652         rollback_lock_file(lock_file);
653
654         return has_errors ? 1 : 0;
655 }