Merge branch 'pb/maint-use-custom-perl'
[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 "quote.h"
8 #include "cache-tree.h"
9 #include "tree-walk.h"
10 #include "builtin.h"
11 #include "refs.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;
27 #define MARK_VALID 1
28 #define UNMARK_VALID 2
29
30 __attribute__((format (printf, 1, 2)))
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 |= CE_VALID;
52                         break;
53                 case UNMARK_VALID:
54                         active_cache[pos]->ce_flags &= ~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 = 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(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(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         len = strlen(path);
199         if (has_symlink_leading_path(path, len))
200                 return error("'%s' is beyond a symbolic link", path);
201
202         /*
203          * First things first: get the stat information, to decide
204          * what to do about the pathname!
205          */
206         if (lstat(path, &st) < 0)
207                 return process_lstat_error(path, errno);
208
209         if (S_ISDIR(st.st_mode))
210                 return process_directory(path, len, &st);
211
212         return process_file(path, len, &st);
213 }
214
215 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
216                          const char *path, int stage)
217 {
218         int size, len, option;
219         struct cache_entry *ce;
220
221         if (!verify_path(path))
222                 return error("Invalid path '%s'", path);
223
224         len = strlen(path);
225         size = cache_entry_size(len);
226         ce = xcalloc(1, size);
227
228         hashcpy(ce->sha1, sha1);
229         memcpy(ce->name, path, len);
230         ce->ce_flags = create_ce_flags(len, stage);
231         ce->ce_mode = create_ce_mode(mode);
232         if (assume_unchanged)
233                 ce->ce_flags |= CE_VALID;
234         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
235         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
236         if (add_cache_entry(ce, option))
237                 return error("%s: cannot add to the index - missing --add option?",
238                              path);
239         report("add '%s'", path);
240         return 0;
241 }
242
243 static void chmod_path(int flip, const char *path)
244 {
245         int pos;
246         struct cache_entry *ce;
247         unsigned int mode;
248
249         pos = cache_name_pos(path, strlen(path));
250         if (pos < 0)
251                 goto fail;
252         ce = active_cache[pos];
253         mode = ce->ce_mode;
254         if (!S_ISREG(mode))
255                 goto fail;
256         switch (flip) {
257         case '+':
258                 ce->ce_mode |= 0111; break;
259         case '-':
260                 ce->ce_mode &= ~0111; break;
261         default:
262                 goto fail;
263         }
264         cache_tree_invalidate_path(active_cache_tree, path);
265         active_cache_changed = 1;
266         report("chmod %cx '%s'", flip, path);
267         return;
268  fail:
269         die("git update-index: cannot chmod %cx '%s'", flip, path);
270 }
271
272 static void update_one(const char *path, const char *prefix, int prefix_length)
273 {
274         const char *p = prefix_path(prefix, prefix_length, path);
275         if (!verify_path(p)) {
276                 fprintf(stderr, "Ignoring path %s\n", path);
277                 goto free_return;
278         }
279         if (mark_valid_only) {
280                 if (mark_valid(p))
281                         die("Unable to mark file %s", path);
282                 goto free_return;
283         }
284
285         if (force_remove) {
286                 if (remove_file_from_cache(p))
287                         die("git update-index: unable to remove %s", path);
288                 report("remove '%s'", path);
289                 goto free_return;
290         }
291         if (process_path(p))
292                 die("Unable to process path %s", path);
293         report("add '%s'", path);
294  free_return:
295         if (p < path || p > path + strlen(path))
296                 free((char *)p);
297 }
298
299 static void read_index_info(int line_termination)
300 {
301         struct strbuf buf = STRBUF_INIT;
302         struct strbuf uq = STRBUF_INIT;
303
304         while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
305                 char *ptr, *tab;
306                 char *path_name;
307                 unsigned char sha1[20];
308                 unsigned int mode;
309                 unsigned long ul;
310                 int stage;
311
312                 /* This reads lines formatted in one of three formats:
313                  *
314                  * (1) mode         SP sha1          TAB path
315                  * The first format is what "git apply --index-info"
316                  * reports, and used to reconstruct a partial tree
317                  * that is used for phony merge base tree when falling
318                  * back on 3-way merge.
319                  *
320                  * (2) mode SP type SP sha1          TAB path
321                  * The second format is to stuff "git ls-tree" output
322                  * into the index file.
323                  *
324                  * (3) mode         SP sha1 SP stage TAB path
325                  * This format is to put higher order stages into the
326                  * index file and matches "git ls-files --stage" output.
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                 path_name = ptr;
353                 if (line_termination && path_name[0] == '"') {
354                         strbuf_reset(&uq);
355                         if (unquote_c_style(&uq, path_name, NULL)) {
356                                 die("git update-index: bad quoting of path name");
357                         }
358                         path_name = uq.buf;
359                 }
360
361                 if (!verify_path(path_name)) {
362                         fprintf(stderr, "Ignoring path %s\n", path_name);
363                         continue;
364                 }
365
366                 if (!mode) {
367                         /* mode == 0 means there is no such path -- remove */
368                         if (remove_file_from_cache(path_name))
369                                 die("git update-index: unable to remove %s",
370                                     ptr);
371                 }
372                 else {
373                         /* mode ' ' sha1 '\t' name
374                          * ptr[-1] points at tab,
375                          * ptr[-41] is at the beginning of sha1
376                          */
377                         ptr[-42] = ptr[-1] = 0;
378                         if (add_cacheinfo(mode, sha1, path_name, stage))
379                                 die("git update-index: unable to update %s",
380                                     path_name);
381                 }
382                 continue;
383
384         bad_line:
385                 die("malformed index info %s", buf.buf);
386         }
387         strbuf_release(&buf);
388         strbuf_release(&uq);
389 }
390
391 static const char update_index_usage[] =
392 "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>...";
393
394 static unsigned char head_sha1[20];
395 static unsigned char merge_head_sha1[20];
396
397 static struct cache_entry *read_one_ent(const char *which,
398                                         unsigned char *ent, const char *path,
399                                         int namelen, int stage)
400 {
401         unsigned mode;
402         unsigned char sha1[20];
403         int size;
404         struct cache_entry *ce;
405
406         if (get_tree_entry(ent, path, sha1, &mode)) {
407                 if (which)
408                         error("%s: not in %s branch.", path, which);
409                 return NULL;
410         }
411         if (mode == S_IFDIR) {
412                 if (which)
413                         error("%s: not a blob in %s branch.", path, which);
414                 return NULL;
415         }
416         size = cache_entry_size(namelen);
417         ce = xcalloc(1, size);
418
419         hashcpy(ce->sha1, sha1);
420         memcpy(ce->name, path, namelen);
421         ce->ce_flags = create_ce_flags(namelen, stage);
422         ce->ce_mode = create_ce_mode(mode);
423         return ce;
424 }
425
426 static int unresolve_one(const char *path)
427 {
428         int namelen = strlen(path);
429         int pos;
430         int ret = 0;
431         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
432
433         /* See if there is such entry in the index. */
434         pos = cache_name_pos(path, namelen);
435         if (pos < 0) {
436                 /* If there isn't, either it is unmerged, or
437                  * resolved as "removed" by mistake.  We do not
438                  * want to do anything in the former case.
439                  */
440                 pos = -pos-1;
441                 if (pos < active_nr) {
442                         struct cache_entry *ce = active_cache[pos];
443                         if (ce_namelen(ce) == namelen &&
444                             !memcmp(ce->name, path, namelen)) {
445                                 fprintf(stderr,
446                                         "%s: skipping still unmerged path.\n",
447                                         path);
448                                 goto free_return;
449                         }
450                 }
451         }
452
453         /* Grab blobs from given path from HEAD and MERGE_HEAD,
454          * stuff HEAD version in stage #2,
455          * stuff MERGE_HEAD version in stage #3.
456          */
457         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
458         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
459
460         if (!ce_2 || !ce_3) {
461                 ret = -1;
462                 goto free_return;
463         }
464         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
465             ce_2->ce_mode == ce_3->ce_mode) {
466                 fprintf(stderr, "%s: identical in both, skipping.\n",
467                         path);
468                 goto free_return;
469         }
470
471         remove_file_from_cache(path);
472         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
473                 error("%s: cannot add our version to the index.", path);
474                 ret = -1;
475                 goto free_return;
476         }
477         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
478                 return 0;
479         error("%s: cannot add their version to the index.", path);
480         ret = -1;
481  free_return:
482         free(ce_2);
483         free(ce_3);
484         return ret;
485 }
486
487 static void read_head_pointers(void)
488 {
489         if (read_ref("HEAD", head_sha1))
490                 die("No HEAD -- no initial commit yet?");
491         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
492                 fprintf(stderr, "Not in the middle of a merge.\n");
493                 exit(0);
494         }
495 }
496
497 static int do_unresolve(int ac, const char **av,
498                         const char *prefix, int prefix_length)
499 {
500         int i;
501         int err = 0;
502
503         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
504          * are not doing a merge, so exit with success status.
505          */
506         read_head_pointers();
507
508         for (i = 1; i < ac; i++) {
509                 const char *arg = av[i];
510                 const char *p = prefix_path(prefix, prefix_length, arg);
511                 err |= unresolve_one(p);
512                 if (p < arg || p > arg + strlen(arg))
513                         free((char *)p);
514         }
515         return err;
516 }
517
518 static int do_reupdate(int ac, const char **av,
519                        const char *prefix, int prefix_length)
520 {
521         /* Read HEAD and run update-index on paths that are
522          * merged and already different between index and HEAD.
523          */
524         int pos;
525         int has_head = 1;
526         const char **pathspec = get_pathspec(prefix, av + 1);
527
528         if (read_ref("HEAD", head_sha1))
529                 /* If there is no HEAD, that means it is an initial
530                  * commit.  Update everything in the index.
531                  */
532                 has_head = 0;
533  redo:
534         for (pos = 0; pos < active_nr; pos++) {
535                 struct cache_entry *ce = active_cache[pos];
536                 struct cache_entry *old = NULL;
537                 int save_nr;
538
539                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
540                         continue;
541                 if (has_head)
542                         old = read_one_ent(NULL, head_sha1,
543                                            ce->name, ce_namelen(ce), 0);
544                 if (old && ce->ce_mode == old->ce_mode &&
545                     !hashcmp(ce->sha1, old->sha1)) {
546                         free(old);
547                         continue; /* unchanged */
548                 }
549                 /* Be careful.  The working tree may not have the
550                  * path anymore, in which case, under 'allow_remove',
551                  * or worse yet 'allow_replace', active_nr may decrease.
552                  */
553                 save_nr = active_nr;
554                 update_one(ce->name + prefix_length, prefix, prefix_length);
555                 if (save_nr != active_nr)
556                         goto redo;
557         }
558         return 0;
559 }
560
561 int cmd_update_index(int argc, const char **argv, const char *prefix)
562 {
563         int i, newfd, entries, has_errors = 0, line_termination = '\n';
564         int allow_options = 1;
565         int read_from_stdin = 0;
566         int prefix_length = prefix ? strlen(prefix) : 0;
567         char set_executable_bit = 0;
568         unsigned int refresh_flags = 0;
569         int lock_error = 0;
570         struct lock_file *lock_file;
571
572         git_config(git_default_config, NULL);
573
574         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
575         lock_file = xcalloc(1, sizeof(struct lock_file));
576
577         newfd = hold_locked_index(lock_file, 0);
578         if (newfd < 0)
579                 lock_error = errno;
580
581         entries = read_cache();
582         if (entries < 0)
583                 die("cache corrupted");
584
585         for (i = 1 ; i < argc; i++) {
586                 const char *path = argv[i];
587                 const char *p;
588
589                 if (allow_options && *path == '-') {
590                         if (!strcmp(path, "--")) {
591                                 allow_options = 0;
592                                 continue;
593                         }
594                         if (!strcmp(path, "-q")) {
595                                 refresh_flags |= REFRESH_QUIET;
596                                 continue;
597                         }
598                         if (!strcmp(path, "--ignore-submodules")) {
599                                 refresh_flags |= REFRESH_IGNORE_SUBMODULES;
600                                 continue;
601                         }
602                         if (!strcmp(path, "--add")) {
603                                 allow_add = 1;
604                                 continue;
605                         }
606                         if (!strcmp(path, "--replace")) {
607                                 allow_replace = 1;
608                                 continue;
609                         }
610                         if (!strcmp(path, "--remove")) {
611                                 allow_remove = 1;
612                                 continue;
613                         }
614                         if (!strcmp(path, "--unmerged")) {
615                                 refresh_flags |= REFRESH_UNMERGED;
616                                 continue;
617                         }
618                         if (!strcmp(path, "--refresh")) {
619                                 setup_work_tree();
620                                 has_errors |= refresh_cache(refresh_flags);
621                                 continue;
622                         }
623                         if (!strcmp(path, "--really-refresh")) {
624                                 setup_work_tree();
625                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
626                                 continue;
627                         }
628                         if (!strcmp(path, "--cacheinfo")) {
629                                 unsigned char sha1[20];
630                                 unsigned int mode;
631
632                                 if (i+3 >= argc)
633                                         die("git update-index: --cacheinfo <mode> <sha1> <path>");
634
635                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
636                                     get_sha1_hex(argv[i+2], sha1) ||
637                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
638                                         die("git update-index: --cacheinfo"
639                                             " cannot add %s", argv[i+3]);
640                                 i += 3;
641                                 continue;
642                         }
643                         if (!strcmp(path, "--chmod=-x") ||
644                             !strcmp(path, "--chmod=+x")) {
645                                 if (argc <= i+1)
646                                         die("git update-index: %s <path>", path);
647                                 set_executable_bit = path[8];
648                                 continue;
649                         }
650                         if (!strcmp(path, "--assume-unchanged")) {
651                                 mark_valid_only = MARK_VALID;
652                                 continue;
653                         }
654                         if (!strcmp(path, "--no-assume-unchanged")) {
655                                 mark_valid_only = UNMARK_VALID;
656                                 continue;
657                         }
658                         if (!strcmp(path, "--info-only")) {
659                                 info_only = 1;
660                                 continue;
661                         }
662                         if (!strcmp(path, "--force-remove")) {
663                                 force_remove = 1;
664                                 continue;
665                         }
666                         if (!strcmp(path, "-z")) {
667                                 line_termination = 0;
668                                 continue;
669                         }
670                         if (!strcmp(path, "--stdin")) {
671                                 if (i != argc - 1)
672                                         die("--stdin must be at the end");
673                                 read_from_stdin = 1;
674                                 break;
675                         }
676                         if (!strcmp(path, "--index-info")) {
677                                 if (i != argc - 1)
678                                         die("--index-info must be at the end");
679                                 allow_add = allow_replace = allow_remove = 1;
680                                 read_index_info(line_termination);
681                                 break;
682                         }
683                         if (!strcmp(path, "--unresolve")) {
684                                 has_errors = do_unresolve(argc - i, argv + i,
685                                                           prefix, prefix_length);
686                                 if (has_errors)
687                                         active_cache_changed = 0;
688                                 goto finish;
689                         }
690                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
691                                 setup_work_tree();
692                                 has_errors = do_reupdate(argc - i, argv + i,
693                                                          prefix, prefix_length);
694                                 if (has_errors)
695                                         active_cache_changed = 0;
696                                 goto finish;
697                         }
698                         if (!strcmp(path, "--ignore-missing")) {
699                                 refresh_flags |= REFRESH_IGNORE_MISSING;
700                                 continue;
701                         }
702                         if (!strcmp(path, "--verbose")) {
703                                 verbose = 1;
704                                 continue;
705                         }
706                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
707                                 usage(update_index_usage);
708                         die("unknown option %s", path);
709                 }
710                 setup_work_tree();
711                 p = prefix_path(prefix, prefix_length, path);
712                 update_one(p, NULL, 0);
713                 if (set_executable_bit)
714                         chmod_path(set_executable_bit, p);
715                 if (p < path || p > path + strlen(path))
716                         free((char *)p);
717         }
718         if (read_from_stdin) {
719                 struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
720
721                 setup_work_tree();
722                 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
723                         const char *p;
724                         if (line_termination && buf.buf[0] == '"') {
725                                 strbuf_reset(&nbuf);
726                                 if (unquote_c_style(&nbuf, buf.buf, NULL))
727                                         die("line is badly quoted");
728                                 strbuf_swap(&buf, &nbuf);
729                         }
730                         p = prefix_path(prefix, prefix_length, buf.buf);
731                         update_one(p, NULL, 0);
732                         if (set_executable_bit)
733                                 chmod_path(set_executable_bit, p);
734                         if (p < buf.buf || p > buf.buf + buf.len)
735                                 free((char *)p);
736                 }
737                 strbuf_release(&nbuf);
738                 strbuf_release(&buf);
739         }
740
741  finish:
742         if (active_cache_changed) {
743                 if (newfd < 0) {
744                         if (refresh_flags & REFRESH_QUIET)
745                                 exit(128);
746                         unable_to_lock_index_die(get_index_file(), lock_error);
747                 }
748                 if (write_cache(newfd, active_cache, active_nr) ||
749                     commit_locked_index(lock_file))
750                         die("Unable to write new index file");
751         }
752
753         rollback_lock_file(lock_file);
754
755         return has_errors ? 1 : 0;
756 }