Simplify cache API
[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 #include "refs.h"
13
14 /*
15  * Default to not allowing changes to the list of files. The
16  * tool doesn't actually care, but this makes it harder to add
17  * files to the revision control by mistake by doing something
18  * like "git-update-index *" and suddenly having all the object
19  * files be revision controlled.
20  */
21 static int allow_add;
22 static int allow_remove;
23 static int allow_replace;
24 static int info_only;
25 static int force_remove;
26 static int verbose;
27 static int mark_valid_only;
28 #define MARK_VALID 1
29 #define UNMARK_VALID 2
30
31 static void report(const char *fmt, ...)
32 {
33         va_list vp;
34
35         if (!verbose)
36                 return;
37
38         va_start(vp, fmt);
39         vprintf(fmt, vp);
40         putchar('\n');
41         va_end(vp);
42 }
43
44 static int mark_valid(const char *path)
45 {
46         int namelen = strlen(path);
47         int pos = cache_name_pos(path, namelen);
48         if (0 <= pos) {
49                 switch (mark_valid_only) {
50                 case MARK_VALID:
51                         active_cache[pos]->ce_flags |= htons(CE_VALID);
52                         break;
53                 case UNMARK_VALID:
54                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
55                         break;
56                 }
57                 cache_tree_invalidate_path(active_cache_tree, path);
58                 active_cache_changed = 1;
59                 return 0;
60         }
61         return -1;
62 }
63
64 static int remove_one_path(const char *path)
65 {
66         if (!allow_remove)
67                 return error("%s: does not exist and --remove not passed", path);
68         if (remove_file_from_cache(path))
69                 return error("%s: cannot remove from the index", path);
70         return 0;
71 }
72
73 /*
74  * Handle a path that couldn't be lstat'ed. It's either:
75  *  - missing file (ENOENT or ENOTDIR). That's ok if we're
76  *    supposed to be removing it and the removal actually
77  *    succeeds.
78  *  - permission error. That's never ok.
79  */
80 static int process_lstat_error(const char *path, int err)
81 {
82         if (err == ENOENT || err == ENOTDIR)
83                 return remove_one_path(path);
84         return error("lstat(\"%s\"): %s", path, strerror(errno));
85 }
86
87 static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
88 {
89         int option, size;
90         struct cache_entry *ce;
91
92         /* Was the old index entry already up-to-date? */
93         if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
94                 return 0;
95
96         size = cache_entry_size(len);
97         ce = xcalloc(1, size);
98         memcpy(ce->name, path, len);
99         ce->ce_flags = htons(len);
100         fill_stat_cache_info(ce, st);
101         ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
102
103         if (index_path(ce->sha1, path, st, !info_only))
104                 return -1;
105         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
106         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
107         if (add_cache_entry(ce, option))
108                 return error("%s: cannot add to the index - missing --add option?", path);
109         return 0;
110 }
111
112 /*
113  * Handle a path that was a directory. Four cases:
114  *
115  *  - it's already a gitlink in the index, and we keep it that
116  *    way, and update it if we can (if we cannot find the HEAD,
117  *    we're going to keep it unchanged in the index!)
118  *
119  *  - it's a *file* in the index, in which case it should be
120  *    removed as a file if removal is allowed, since it doesn't
121  *    exist as such any more. If removal isn't allowed, it's
122  *    an error.
123  *
124  *    (NOTE! This is old and arguably fairly strange behaviour.
125  *    We might want to make this an error unconditionally, and
126  *    use "--force-remove" if you actually want to force removal).
127  *
128  *  - it used to exist as a subdirectory (ie multiple files with
129  *    this particular prefix) in the index, in which case it's wrong
130  *    to try to update it as a directory.
131  *
132  *  - it doesn't exist at all in the index, but it is a valid
133  *    git directory, and it should be *added* as a gitlink.
134  */
135 static int process_directory(const char *path, int len, struct stat *st)
136 {
137         unsigned char sha1[20];
138         int pos = cache_name_pos(path, len);
139
140         /* Exact match: file or existing gitlink */
141         if (pos >= 0) {
142                 struct cache_entry *ce = active_cache[pos];
143                 if (S_ISGITLINK(ntohl(ce->ce_mode))) {
144
145                         /* Do nothing to the index if there is no HEAD! */
146                         if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
147                                 return 0;
148
149                         return add_one_path(ce, path, len, st);
150                 }
151                 /* Should this be an unconditional error? */
152                 return remove_one_path(path);
153         }
154
155         /* Inexact match: is there perhaps a subdirectory match? */
156         pos = -pos-1;
157         while (pos < active_nr) {
158                 struct cache_entry *ce = active_cache[pos++];
159
160                 if (strncmp(ce->name, path, len))
161                         break;
162                 if (ce->name[len] > '/')
163                         break;
164                 if (ce->name[len] < '/')
165                         continue;
166
167                 /* Subdirectory match - error out */
168                 return error("%s: is a directory - add individual files instead", path);
169         }
170
171         /* No match - should we add it as a gitlink? */
172         if (!resolve_gitlink_ref(path, "HEAD", sha1))
173                 return add_one_path(NULL, path, len, st);
174
175         /* Error out. */
176         return error("%s: is a directory - add files inside instead", path);
177 }
178
179 /*
180  * Process a regular file
181  */
182 static int process_file(const char *path, int len, struct stat *st)
183 {
184         int pos = cache_name_pos(path, len);
185         struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
186
187         if (ce && S_ISGITLINK(ntohl(ce->ce_mode)))
188                 return error("%s is already a gitlink, not replacing", path);
189
190         return add_one_path(ce, path, len, st);
191 }
192
193 static int process_path(const char *path)
194 {
195         int len;
196         struct stat st;
197
198         /*
199          * First things first: get the stat information, to decide
200          * what to do about the pathname!
201          */
202         if (lstat(path, &st) < 0)
203                 return process_lstat_error(path, errno);
204
205         len = strlen(path);
206         if (S_ISDIR(st.st_mode))
207                 return process_directory(path, len, &st);
208
209         return process_file(path, len, &st);
210 }
211
212 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
213                          const char *path, int stage)
214 {
215         int size, len, option;
216         struct cache_entry *ce;
217
218         if (!verify_path(path))
219                 return -1;
220
221         len = strlen(path);
222         size = cache_entry_size(len);
223         ce = xcalloc(1, size);
224
225         hashcpy(ce->sha1, sha1);
226         memcpy(ce->name, path, len);
227         ce->ce_flags = create_ce_flags(len, stage);
228         ce->ce_mode = create_ce_mode(mode);
229         if (assume_unchanged)
230                 ce->ce_flags |= htons(CE_VALID);
231         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
232         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
233         if (add_cache_entry(ce, option))
234                 return error("%s: cannot add to the index - missing --add option?",
235                              path);
236         report("add '%s'", path);
237         return 0;
238 }
239
240 static void chmod_path(int flip, const char *path)
241 {
242         int pos;
243         struct cache_entry *ce;
244         unsigned int mode;
245
246         pos = cache_name_pos(path, strlen(path));
247         if (pos < 0)
248                 goto fail;
249         ce = active_cache[pos];
250         mode = ntohl(ce->ce_mode);
251         if (!S_ISREG(mode))
252                 goto fail;
253         switch (flip) {
254         case '+':
255                 ce->ce_mode |= htonl(0111); break;
256         case '-':
257                 ce->ce_mode &= htonl(~0111); break;
258         default:
259                 goto fail;
260         }
261         cache_tree_invalidate_path(active_cache_tree, path);
262         active_cache_changed = 1;
263         report("chmod %cx '%s'", flip, path);
264         return;
265  fail:
266         die("git-update-index: cannot chmod %cx '%s'", flip, path);
267 }
268
269 static void update_one(const char *path, const char *prefix, int prefix_length)
270 {
271         const char *p = prefix_path(prefix, prefix_length, path);
272         if (!verify_path(p)) {
273                 fprintf(stderr, "Ignoring path %s\n", path);
274                 goto free_return;
275         }
276         if (mark_valid_only) {
277                 if (mark_valid(p))
278                         die("Unable to mark file %s", path);
279                 goto free_return;
280         }
281
282         if (force_remove) {
283                 if (remove_file_from_cache(p))
284                         die("git-update-index: unable to remove %s", path);
285                 report("remove '%s'", path);
286                 goto free_return;
287         }
288         if (process_path(p))
289                 die("Unable to process path %s", path);
290         report("add '%s'", path);
291  free_return:
292         if (p < path || p > path + strlen(path))
293                 free((char*)p);
294 }
295
296 static void read_index_info(int line_termination)
297 {
298         struct strbuf buf;
299         strbuf_init(&buf);
300         while (1) {
301                 char *ptr, *tab;
302                 char *path_name;
303                 unsigned char sha1[20];
304                 unsigned int mode;
305                 unsigned long ul;
306                 int stage;
307
308                 /* This reads lines formatted in one of three formats:
309                  *
310                  * (1) mode         SP sha1          TAB path
311                  * The first format is what "git-apply --index-info"
312                  * reports, and used to reconstruct a partial tree
313                  * that is used for phony merge base tree when falling
314                  * back on 3-way merge.
315                  *
316                  * (2) mode SP type SP sha1          TAB path
317                  * The second format is to stuff git-ls-tree output
318                  * into the index file.
319                  *
320                  * (3) mode         SP sha1 SP stage TAB path
321                  * This format is to put higher order stages into the
322                  * index file and matches git-ls-files --stage output.
323                  */
324                 read_line(&buf, stdin, line_termination);
325                 if (buf.eof)
326                         break;
327
328                 errno = 0;
329                 ul = strtoul(buf.buf, &ptr, 8);
330                 if (ptr == buf.buf || *ptr != ' '
331                     || errno || (unsigned int) ul != ul)
332                         goto bad_line;
333                 mode = ul;
334
335                 tab = strchr(ptr, '\t');
336                 if (!tab || tab - ptr < 41)
337                         goto bad_line;
338
339                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
340                         stage = tab[-1] - '0';
341                         ptr = tab + 1; /* point at the head of path */
342                         tab = tab - 2; /* point at tail of sha1 */
343                 }
344                 else {
345                         stage = 0;
346                         ptr = tab + 1; /* point at the head of path */
347                 }
348
349                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
350                         goto bad_line;
351
352                 if (line_termination && ptr[0] == '"')
353                         path_name = unquote_c_style(ptr, NULL);
354                 else
355                         path_name = ptr;
356
357                 if (!verify_path(path_name)) {
358                         fprintf(stderr, "Ignoring path %s\n", path_name);
359                         if (path_name != ptr)
360                                 free(path_name);
361                         continue;
362                 }
363
364                 if (!mode) {
365                         /* mode == 0 means there is no such path -- remove */
366                         if (remove_file_from_cache(path_name))
367                                 die("git-update-index: unable to remove %s",
368                                     ptr);
369                 }
370                 else {
371                         /* mode ' ' sha1 '\t' name
372                          * ptr[-1] points at tab,
373                          * ptr[-41] is at the beginning of sha1
374                          */
375                         ptr[-42] = ptr[-1] = 0;
376                         if (add_cacheinfo(mode, sha1, path_name, stage))
377                                 die("git-update-index: unable to update %s",
378                                     path_name);
379                 }
380                 if (path_name != ptr)
381                         free(path_name);
382                 continue;
383
384         bad_line:
385                 die("malformed index info %s", buf.buf);
386         }
387 }
388
389 static const char update_index_usage[] =
390 "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 | -g] [--ignore-missing] [-z] [--verbose] [--] <file>...";
391
392 static unsigned char head_sha1[20];
393 static unsigned char merge_head_sha1[20];
394
395 static struct cache_entry *read_one_ent(const char *which,
396                                         unsigned char *ent, const char *path,
397                                         int namelen, int stage)
398 {
399         unsigned mode;
400         unsigned char sha1[20];
401         int size;
402         struct cache_entry *ce;
403
404         if (get_tree_entry(ent, path, sha1, &mode)) {
405                 if (which)
406                         error("%s: not in %s branch.", path, which);
407                 return NULL;
408         }
409         if (mode == S_IFDIR) {
410                 if (which)
411                         error("%s: not a blob in %s branch.", path, which);
412                 return NULL;
413         }
414         size = cache_entry_size(namelen);
415         ce = xcalloc(1, size);
416
417         hashcpy(ce->sha1, sha1);
418         memcpy(ce->name, path, namelen);
419         ce->ce_flags = create_ce_flags(namelen, stage);
420         ce->ce_mode = create_ce_mode(mode);
421         return ce;
422 }
423
424 static int unresolve_one(const char *path)
425 {
426         int namelen = strlen(path);
427         int pos;
428         int ret = 0;
429         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
430
431         /* See if there is such entry in the index. */
432         pos = cache_name_pos(path, namelen);
433         if (pos < 0) {
434                 /* If there isn't, either it is unmerged, or
435                  * resolved as "removed" by mistake.  We do not
436                  * want to do anything in the former case.
437                  */
438                 pos = -pos-1;
439                 if (pos < active_nr) {
440                         struct cache_entry *ce = active_cache[pos];
441                         if (ce_namelen(ce) == namelen &&
442                             !memcmp(ce->name, path, namelen)) {
443                                 fprintf(stderr,
444                                         "%s: skipping still unmerged path.\n",
445                                         path);
446                                 goto free_return;
447                         }
448                 }
449         }
450
451         /* Grab blobs from given path from HEAD and MERGE_HEAD,
452          * stuff HEAD version in stage #2,
453          * stuff MERGE_HEAD version in stage #3.
454          */
455         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
456         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
457
458         if (!ce_2 || !ce_3) {
459                 ret = -1;
460                 goto free_return;
461         }
462         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
463             ce_2->ce_mode == ce_3->ce_mode) {
464                 fprintf(stderr, "%s: identical in both, skipping.\n",
465                         path);
466                 goto free_return;
467         }
468
469         remove_file_from_cache(path);
470         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
471                 error("%s: cannot add our version to the index.", path);
472                 ret = -1;
473                 goto free_return;
474         }
475         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
476                 return 0;
477         error("%s: cannot add their version to the index.", path);
478         ret = -1;
479  free_return:
480         free(ce_2);
481         free(ce_3);
482         return ret;
483 }
484
485 static void read_head_pointers(void)
486 {
487         if (read_ref("HEAD", head_sha1))
488                 die("No HEAD -- no initial commit yet?\n");
489         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
490                 fprintf(stderr, "Not in the middle of a merge.\n");
491                 exit(0);
492         }
493 }
494
495 static int do_unresolve(int ac, const char **av,
496                         const char *prefix, int prefix_length)
497 {
498         int i;
499         int err = 0;
500
501         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
502          * are not doing a merge, so exit with success status.
503          */
504         read_head_pointers();
505
506         for (i = 1; i < ac; i++) {
507                 const char *arg = av[i];
508                 const char *p = prefix_path(prefix, prefix_length, arg);
509                 err |= unresolve_one(p);
510                 if (p < arg || p > arg + strlen(arg))
511                         free((char*)p);
512         }
513         return err;
514 }
515
516 static int do_reupdate(int ac, const char **av,
517                        const char *prefix, int prefix_length)
518 {
519         /* Read HEAD and run update-index on paths that are
520          * merged and already different between index and HEAD.
521          */
522         int pos;
523         int has_head = 1;
524         const char **pathspec = get_pathspec(prefix, av + 1);
525
526         if (read_ref("HEAD", head_sha1))
527                 /* If there is no HEAD, that means it is an initial
528                  * commit.  Update everything in the index.
529                  */
530                 has_head = 0;
531  redo:
532         for (pos = 0; pos < active_nr; pos++) {
533                 struct cache_entry *ce = active_cache[pos];
534                 struct cache_entry *old = NULL;
535                 int save_nr;
536
537                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
538                         continue;
539                 if (has_head)
540                         old = read_one_ent(NULL, head_sha1,
541                                            ce->name, ce_namelen(ce), 0);
542                 if (old && ce->ce_mode == old->ce_mode &&
543                     !hashcmp(ce->sha1, old->sha1)) {
544                         free(old);
545                         continue; /* unchanged */
546                 }
547                 /* Be careful.  The working tree may not have the
548                  * path anymore, in which case, under 'allow_remove',
549                  * or worse yet 'allow_replace', active_nr may decrease.
550                  */
551                 save_nr = active_nr;
552                 update_one(ce->name + prefix_length, prefix, prefix_length);
553                 if (save_nr != active_nr)
554                         goto redo;
555         }
556         return 0;
557 }
558
559 int cmd_update_index(int argc, const char **argv, const char *prefix)
560 {
561         int i, newfd, entries, has_errors = 0, line_termination = '\n';
562         int allow_options = 1;
563         int read_from_stdin = 0;
564         int prefix_length = prefix ? strlen(prefix) : 0;
565         char set_executable_bit = 0;
566         unsigned int refresh_flags = 0;
567         int lock_error = 0;
568         struct lock_file *lock_file;
569
570         git_config(git_default_config);
571
572         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
573         lock_file = xcalloc(1, sizeof(struct lock_file));
574
575         newfd = hold_locked_index(lock_file, 0);
576         if (newfd < 0)
577                 lock_error = errno;
578
579         entries = read_cache();
580         if (entries < 0)
581                 die("cache corrupted");
582
583         for (i = 1 ; i < argc; i++) {
584                 const char *path = argv[i];
585                 const char *p;
586
587                 if (allow_options && *path == '-') {
588                         if (!strcmp(path, "--")) {
589                                 allow_options = 0;
590                                 continue;
591                         }
592                         if (!strcmp(path, "-q")) {
593                                 refresh_flags |= REFRESH_QUIET;
594                                 continue;
595                         }
596                         if (!strcmp(path, "--add")) {
597                                 allow_add = 1;
598                                 continue;
599                         }
600                         if (!strcmp(path, "--replace")) {
601                                 allow_replace = 1;
602                                 continue;
603                         }
604                         if (!strcmp(path, "--remove")) {
605                                 allow_remove = 1;
606                                 continue;
607                         }
608                         if (!strcmp(path, "--unmerged")) {
609                                 refresh_flags |= REFRESH_UNMERGED;
610                                 continue;
611                         }
612                         if (!strcmp(path, "--refresh")) {
613                                 has_errors |= refresh_cache(refresh_flags);
614                                 continue;
615                         }
616                         if (!strcmp(path, "--really-refresh")) {
617                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
618                                 continue;
619                         }
620                         if (!strcmp(path, "--cacheinfo")) {
621                                 unsigned char sha1[20];
622                                 unsigned int mode;
623
624                                 if (i+3 >= argc)
625                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
626
627                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
628                                     get_sha1_hex(argv[i+2], sha1) ||
629                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
630                                         die("git-update-index: --cacheinfo"
631                                             " cannot add %s", argv[i+3]);
632                                 i += 3;
633                                 continue;
634                         }
635                         if (!strcmp(path, "--chmod=-x") ||
636                             !strcmp(path, "--chmod=+x")) {
637                                 if (argc <= i+1)
638                                         die("git-update-index: %s <path>", path);
639                                 set_executable_bit = path[8];
640                                 continue;
641                         }
642                         if (!strcmp(path, "--assume-unchanged")) {
643                                 mark_valid_only = MARK_VALID;
644                                 continue;
645                         }
646                         if (!strcmp(path, "--no-assume-unchanged")) {
647                                 mark_valid_only = UNMARK_VALID;
648                                 continue;
649                         }
650                         if (!strcmp(path, "--info-only")) {
651                                 info_only = 1;
652                                 continue;
653                         }
654                         if (!strcmp(path, "--force-remove")) {
655                                 force_remove = 1;
656                                 continue;
657                         }
658                         if (!strcmp(path, "-z")) {
659                                 line_termination = 0;
660                                 continue;
661                         }
662                         if (!strcmp(path, "--stdin")) {
663                                 if (i != argc - 1)
664                                         die("--stdin must be at the end");
665                                 read_from_stdin = 1;
666                                 break;
667                         }
668                         if (!strcmp(path, "--index-info")) {
669                                 if (i != argc - 1)
670                                         die("--index-info must be at the end");
671                                 allow_add = allow_replace = allow_remove = 1;
672                                 read_index_info(line_termination);
673                                 break;
674                         }
675                         if (!strcmp(path, "--unresolve")) {
676                                 has_errors = do_unresolve(argc - i, argv + i,
677                                                           prefix, prefix_length);
678                                 if (has_errors)
679                                         active_cache_changed = 0;
680                                 goto finish;
681                         }
682                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
683                                 has_errors = do_reupdate(argc - i, argv + i,
684                                                          prefix, prefix_length);
685                                 if (has_errors)
686                                         active_cache_changed = 0;
687                                 goto finish;
688                         }
689                         if (!strcmp(path, "--ignore-missing")) {
690                                 refresh_flags |= REFRESH_IGNORE_MISSING;
691                                 continue;
692                         }
693                         if (!strcmp(path, "--verbose")) {
694                                 verbose = 1;
695                                 continue;
696                         }
697                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
698                                 usage(update_index_usage);
699                         die("unknown option %s", path);
700                 }
701                 p = prefix_path(prefix, prefix_length, path);
702                 update_one(p, NULL, 0);
703                 if (set_executable_bit)
704                         chmod_path(set_executable_bit, p);
705                 if (p < path || p > path + strlen(path))
706                         free((char*)p);
707         }
708         if (read_from_stdin) {
709                 struct strbuf buf;
710                 strbuf_init(&buf);
711                 while (1) {
712                         char *path_name;
713                         const char *p;
714                         read_line(&buf, stdin, line_termination);
715                         if (buf.eof)
716                                 break;
717                         if (line_termination && buf.buf[0] == '"')
718                                 path_name = unquote_c_style(buf.buf, NULL);
719                         else
720                                 path_name = buf.buf;
721                         p = prefix_path(prefix, prefix_length, path_name);
722                         update_one(p, NULL, 0);
723                         if (set_executable_bit)
724                                 chmod_path(set_executable_bit, p);
725                         if (p < path_name || p > path_name + strlen(path_name))
726                                 free((char*) p);
727                         if (path_name != buf.buf)
728                                 free(path_name);
729                 }
730         }
731
732  finish:
733         if (active_cache_changed) {
734                 if (newfd < 0) {
735                         if (refresh_flags & REFRESH_QUIET)
736                                 exit(128);
737                         die("unable to create '%s.lock': %s",
738                             get_index_file(), strerror(lock_error));
739                 }
740                 if (write_cache(newfd, active_cache, active_nr) ||
741                     close(newfd) || commit_locked_index(lock_file))
742                         die("Unable to write new index file");
743         }
744
745         rollback_lock_file(lock_file);
746
747         return has_errors ? 1 : 0;
748 }