Merge branch 'lt/dirwalk' into next
[git] / 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
12 /*
13  * Default to not allowing changes to the list of files. The
14  * tool doesn't actually care, but this makes it harder to add
15  * files to the revision control by mistake by doing something
16  * like "git-update-index *" and suddenly having all the object
17  * files be revision controlled.
18  */
19 static int allow_add;
20 static int allow_remove;
21 static int allow_replace;
22 static int allow_unmerged; /* --refresh needing merge is not error */
23 static int not_new; /* --refresh not having working tree files is not error */
24 static int quiet; /* --refresh needing update is not error */
25 static int info_only;
26 static int force_remove;
27 static int verbose;
28 static int mark_valid_only = 0;
29 #define MARK_VALID 1
30 #define UNMARK_VALID 2
31
32
33 /* Three functions to allow overloaded pointer return; see linux/err.h */
34 static inline void *ERR_PTR(long error)
35 {
36         return (void *) error;
37 }
38
39 static inline long PTR_ERR(const void *ptr)
40 {
41         return (long) ptr;
42 }
43
44 static inline long IS_ERR(const void *ptr)
45 {
46         return (unsigned long)ptr > (unsigned long)-1000L;
47 }
48
49 static void report(const char *fmt, ...)
50 {
51         va_list vp;
52
53         if (!verbose)
54                 return;
55
56         va_start(vp, fmt);
57         vprintf(fmt, vp);
58         putchar('\n');
59         va_end(vp);
60 }
61
62 static int mark_valid(const char *path)
63 {
64         int namelen = strlen(path);
65         int pos = cache_name_pos(path, namelen);
66         if (0 <= pos) {
67                 switch (mark_valid_only) {
68                 case MARK_VALID:
69                         active_cache[pos]->ce_flags |= htons(CE_VALID);
70                         break;
71                 case UNMARK_VALID:
72                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
73                         break;
74                 }
75                 cache_tree_invalidate_path(active_cache_tree, path);
76                 active_cache_changed = 1;
77                 return 0;
78         }
79         return -1;
80 }
81
82 static int add_file_to_cache(const char *path)
83 {
84         int size, namelen, option, status;
85         struct cache_entry *ce;
86         struct stat st;
87
88         status = lstat(path, &st);
89
90         /* We probably want to do this in remove_file_from_cache() and
91          * add_cache_entry() instead...
92          */
93         cache_tree_invalidate_path(active_cache_tree, path);
94
95         if (status < 0 || S_ISDIR(st.st_mode)) {
96                 /* When we used to have "path" and now we want to add
97                  * "path/file", we need a way to remove "path" before
98                  * being able to add "path/file".  However,
99                  * "git-update-index --remove path" would not work.
100                  * --force-remove can be used but this is more user
101                  * friendly, especially since we can do the opposite
102                  * case just fine without --force-remove.
103                  */
104                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
105                         if (allow_remove) {
106                                 if (remove_file_from_cache(path))
107                                         return error("%s: cannot remove from the index",
108                                                      path);
109                                 else
110                                         return 0;
111                         } else if (status < 0) {
112                                 return error("%s: does not exist and --remove not passed",
113                                              path);
114                         }
115                 }
116                 if (0 == status)
117                         return error("%s: is a directory - add files inside instead",
118                                      path);
119                 else
120                         return error("lstat(\"%s\"): %s", path,
121                                      strerror(errno));
122         }
123
124         namelen = strlen(path);
125         size = cache_entry_size(namelen);
126         ce = xcalloc(1, size);
127         memcpy(ce->name, path, namelen);
128         ce->ce_flags = htons(namelen);
129         fill_stat_cache_info(ce, &st);
130
131         ce->ce_mode = create_ce_mode(st.st_mode);
132         if (!trust_executable_bit) {
133                 /* If there is an existing entry, pick the mode bits
134                  * from it.
135                  */
136                 int pos = cache_name_pos(path, namelen);
137                 if (0 <= pos)
138                         ce->ce_mode = active_cache[pos]->ce_mode;
139         }
140
141         if (index_path(ce->sha1, path, &st, !info_only))
142                 return -1;
143         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
144         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
145         if (add_cache_entry(ce, option))
146                 return error("%s: cannot add to the index - missing --add option?",
147                              path);
148         return 0;
149 }
150
151 /*
152  * "refresh" does not calculate a new sha1 file or bring the
153  * cache up-to-date for mode/content changes. But what it
154  * _does_ do is to "re-match" the stat information of a file
155  * with the cache, so that you can refresh the cache for a
156  * file that hasn't been changed but where the stat entry is
157  * out of date.
158  *
159  * For example, you'd want to do this after doing a "git-read-tree",
160  * to link up the stat cache details with the proper files.
161  */
162 static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
163 {
164         struct stat st;
165         struct cache_entry *updated;
166         int changed, size;
167
168         if (lstat(ce->name, &st) < 0)
169                 return ERR_PTR(-errno);
170
171         changed = ce_match_stat(ce, &st, really);
172         if (!changed) {
173                 if (really && assume_unchanged &&
174                     !(ce->ce_flags & htons(CE_VALID)))
175                         ; /* mark this one VALID again */
176                 else
177                         return NULL;
178         }
179
180         if (ce_modified(ce, &st, really))
181                 return ERR_PTR(-EINVAL);
182
183         size = ce_size(ce);
184         updated = xmalloc(size);
185         memcpy(updated, ce, size);
186         fill_stat_cache_info(updated, &st);
187
188         /* In this case, if really is not set, we should leave
189          * CE_VALID bit alone.  Otherwise, paths marked with
190          * --no-assume-unchanged (i.e. things to be edited) will
191          * reacquire CE_VALID bit automatically, which is not
192          * really what we want.
193          */
194         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
195                 updated->ce_flags &= ~htons(CE_VALID);
196
197         return updated;
198 }
199
200 static int refresh_cache(int really)
201 {
202         int i;
203         int has_errors = 0;
204
205         for (i = 0; i < active_nr; i++) {
206                 struct cache_entry *ce, *new;
207                 ce = active_cache[i];
208                 if (ce_stage(ce)) {
209                         while ((i < active_nr) &&
210                                ! strcmp(active_cache[i]->name, ce->name))
211                                 i++;
212                         i--;
213                         if (allow_unmerged)
214                                 continue;
215                         printf("%s: needs merge\n", ce->name);
216                         has_errors = 1;
217                         continue;
218                 }
219
220                 new = refresh_entry(ce, really);
221                 if (!new)
222                         continue;
223                 if (IS_ERR(new)) {
224                         if (not_new && PTR_ERR(new) == -ENOENT)
225                                 continue;
226                         if (really && PTR_ERR(new) == -EINVAL) {
227                                 /* If we are doing --really-refresh that
228                                  * means the index is not valid anymore.
229                                  */
230                                 ce->ce_flags &= ~htons(CE_VALID);
231                                 active_cache_changed = 1;
232                         }
233                         if (quiet)
234                                 continue;
235                         printf("%s: needs update\n", ce->name);
236                         has_errors = 1;
237                         continue;
238                 }
239                 active_cache_changed = 1;
240                 /* You can NOT just free active_cache[i] here, since it
241                  * might not be necessarily malloc()ed but can also come
242                  * from mmap(). */
243                 active_cache[i] = new;
244         }
245         return has_errors;
246 }
247
248 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
249                          const char *path, int stage)
250 {
251         int size, len, option;
252         struct cache_entry *ce;
253
254         if (!verify_path(path))
255                 return -1;
256
257         len = strlen(path);
258         size = cache_entry_size(len);
259         ce = xcalloc(1, size);
260
261         memcpy(ce->sha1, sha1, 20);
262         memcpy(ce->name, path, len);
263         ce->ce_flags = create_ce_flags(len, stage);
264         ce->ce_mode = create_ce_mode(mode);
265         if (assume_unchanged)
266                 ce->ce_flags |= htons(CE_VALID);
267         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
268         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
269         if (add_cache_entry(ce, option))
270                 return error("%s: cannot add to the index - missing --add option?",
271                              path);
272         report("add '%s'", path);
273         cache_tree_invalidate_path(active_cache_tree, path);
274         return 0;
275 }
276
277 static void chmod_path(int flip, const char *path)
278 {
279         int pos;
280         struct cache_entry *ce;
281         unsigned int mode;
282
283         pos = cache_name_pos(path, strlen(path));
284         if (pos < 0)
285                 goto fail;
286         ce = active_cache[pos];
287         mode = ntohl(ce->ce_mode);
288         if (!S_ISREG(mode))
289                 goto fail;
290         switch (flip) {
291         case '+':
292                 ce->ce_mode |= htonl(0111); break;
293         case '-':
294                 ce->ce_mode &= htonl(~0111); break;
295         default:
296                 goto fail;
297         }
298         cache_tree_invalidate_path(active_cache_tree, path);
299         active_cache_changed = 1;
300         report("chmod %cx '%s'", flip, path);
301         return;
302  fail:
303         die("git-update-index: cannot chmod %cx '%s'", flip, path);
304 }
305
306 static struct cache_file cache_file;
307
308 static void update_one(const char *path, const char *prefix, int prefix_length)
309 {
310         const char *p = prefix_path(prefix, prefix_length, path);
311         if (!verify_path(p)) {
312                 fprintf(stderr, "Ignoring path %s\n", path);
313                 goto free_return;
314         }
315         if (mark_valid_only) {
316                 if (mark_valid(p))
317                         die("Unable to mark file %s", path);
318                 goto free_return;
319         }
320         cache_tree_invalidate_path(active_cache_tree, path);
321
322         if (force_remove) {
323                 if (remove_file_from_cache(p))
324                         die("git-update-index: unable to remove %s", path);
325                 report("remove '%s'", path);
326                 goto free_return;
327         }
328         if (add_file_to_cache(p))
329                 die("Unable to process file %s", path);
330         report("add '%s'", path);
331  free_return:
332         if (p < path || p > path + strlen(path))
333                 free((char*)p);
334 }
335
336 static void read_index_info(int line_termination)
337 {
338         struct strbuf buf;
339         strbuf_init(&buf);
340         while (1) {
341                 char *ptr, *tab;
342                 char *path_name;
343                 unsigned char sha1[20];
344                 unsigned int mode;
345                 int stage;
346
347                 /* This reads lines formatted in one of three formats:
348                  *
349                  * (1) mode         SP sha1          TAB path
350                  * The first format is what "git-apply --index-info"
351                  * reports, and used to reconstruct a partial tree
352                  * that is used for phony merge base tree when falling
353                  * back on 3-way merge.
354                  *
355                  * (2) mode SP type SP sha1          TAB path
356                  * The second format is to stuff git-ls-tree output
357                  * into the index file.
358                  * 
359                  * (3) mode         SP sha1 SP stage TAB path
360                  * This format is to put higher order stages into the
361                  * index file and matches git-ls-files --stage output.
362                  */
363                 read_line(&buf, stdin, line_termination);
364                 if (buf.eof)
365                         break;
366
367                 mode = strtoul(buf.buf, &ptr, 8);
368                 if (ptr == buf.buf || *ptr != ' ')
369                         goto bad_line;
370
371                 tab = strchr(ptr, '\t');
372                 if (!tab || tab - ptr < 41)
373                         goto bad_line;
374
375                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
376                         stage = tab[-1] - '0';
377                         ptr = tab + 1; /* point at the head of path */
378                         tab = tab - 2; /* point at tail of sha1 */
379                 }
380                 else {
381                         stage = 0;
382                         ptr = tab + 1; /* point at the head of path */
383                 }
384
385                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
386                         goto bad_line;
387
388                 if (line_termination && ptr[0] == '"')
389                         path_name = unquote_c_style(ptr, NULL);
390                 else
391                         path_name = ptr;
392
393                 if (!verify_path(path_name)) {
394                         fprintf(stderr, "Ignoring path %s\n", path_name);
395                         if (path_name != ptr)
396                                 free(path_name);
397                         continue;
398                 }
399                 cache_tree_invalidate_path(active_cache_tree, path_name);
400
401                 if (!mode) {
402                         /* mode == 0 means there is no such path -- remove */
403                         if (remove_file_from_cache(path_name))
404                                 die("git-update-index: unable to remove %s",
405                                     ptr);
406                 }
407                 else {
408                         /* mode ' ' sha1 '\t' name
409                          * ptr[-1] points at tab,
410                          * ptr[-41] is at the beginning of sha1
411                          */
412                         ptr[-42] = ptr[-1] = 0;
413                         if (add_cacheinfo(mode, sha1, path_name, stage))
414                                 die("git-update-index: unable to update %s",
415                                     path_name);
416                 }
417                 if (path_name != ptr)
418                         free(path_name);
419                 continue;
420
421         bad_line:
422                 die("malformed index info %s", buf.buf);
423         }
424 }
425
426 static const char update_index_usage[] =
427 "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>...";
428
429 static unsigned char head_sha1[20];
430 static unsigned char merge_head_sha1[20];
431
432 static struct cache_entry *read_one_ent(const char *which,
433                                         unsigned char *ent, const char *path,
434                                         int namelen, int stage)
435 {
436         unsigned mode;
437         unsigned char sha1[20];
438         int size;
439         struct cache_entry *ce;
440
441         if (get_tree_entry(ent, path, sha1, &mode)) {
442                 if (which)
443                         error("%s: not in %s branch.", path, which);
444                 return NULL;
445         }
446         if (mode == S_IFDIR) {
447                 if (which)
448                         error("%s: not a blob in %s branch.", path, which);
449                 return NULL;
450         }
451         size = cache_entry_size(namelen);
452         ce = xcalloc(1, size);
453
454         memcpy(ce->sha1, sha1, 20);
455         memcpy(ce->name, path, namelen);
456         ce->ce_flags = create_ce_flags(namelen, stage);
457         ce->ce_mode = create_ce_mode(mode);
458         return ce;
459 }
460
461 static int unresolve_one(const char *path)
462 {
463         int namelen = strlen(path);
464         int pos;
465         int ret = 0;
466         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
467
468         /* See if there is such entry in the index. */
469         pos = cache_name_pos(path, namelen);
470         if (pos < 0) {
471                 /* If there isn't, either it is unmerged, or
472                  * resolved as "removed" by mistake.  We do not
473                  * want to do anything in the former case.
474                  */
475                 pos = -pos-1;
476                 if (pos < active_nr) {
477                         struct cache_entry *ce = active_cache[pos];
478                         if (ce_namelen(ce) == namelen &&
479                             !memcmp(ce->name, path, namelen)) {
480                                 fprintf(stderr,
481                                         "%s: skipping still unmerged path.\n",
482                                         path);
483                                 goto free_return;
484                         }
485                 }
486         }
487
488         /* Grab blobs from given path from HEAD and MERGE_HEAD,
489          * stuff HEAD version in stage #2,
490          * stuff MERGE_HEAD version in stage #3.
491          */
492         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
493         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
494
495         if (!ce_2 || !ce_3) {
496                 ret = -1;
497                 goto free_return;
498         }
499         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
500             ce_2->ce_mode == ce_3->ce_mode) {
501                 fprintf(stderr, "%s: identical in both, skipping.\n",
502                         path);
503                 goto free_return;
504         }
505
506         cache_tree_invalidate_path(active_cache_tree, path);
507         remove_file_from_cache(path);
508         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
509                 error("%s: cannot add our version to the index.", path);
510                 ret = -1;
511                 goto free_return;
512         }
513         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
514                 return 0;
515         error("%s: cannot add their version to the index.", path);
516         ret = -1;
517  free_return:
518         free(ce_2);
519         free(ce_3);
520         return ret;
521 }
522
523 static void read_head_pointers(void)
524 {
525         if (read_ref(git_path("HEAD"), head_sha1))
526                 die("No HEAD -- no initial commit yet?\n");
527         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
528                 fprintf(stderr, "Not in the middle of a merge.\n");
529                 exit(0);
530         }
531 }
532
533 static int do_unresolve(int ac, const char **av,
534                         const char *prefix, int prefix_length)
535 {
536         int i;
537         int err = 0;
538
539         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
540          * are not doing a merge, so exit with success status.
541          */
542         read_head_pointers();
543
544         for (i = 1; i < ac; i++) {
545                 const char *arg = av[i];
546                 const char *p = prefix_path(prefix, prefix_length, arg);
547                 err |= unresolve_one(p);
548                 if (p < arg || p > arg + strlen(arg))
549                         free((char*)p);
550         }
551         return err;
552 }
553
554 static int do_reupdate(int ac, const char **av,
555                        const char *prefix, int prefix_length)
556 {
557         /* Read HEAD and run update-index on paths that are
558          * merged and already different between index and HEAD.
559          */
560         int pos;
561         int has_head = 1;
562         const char **pathspec = get_pathspec(prefix, av + 1);
563
564         if (read_ref(git_path("HEAD"), head_sha1))
565                 /* If there is no HEAD, that means it is an initial
566                  * commit.  Update everything in the index.
567                  */
568                 has_head = 0;
569  redo:
570         for (pos = 0; pos < active_nr; pos++) {
571                 struct cache_entry *ce = active_cache[pos];
572                 struct cache_entry *old = NULL;
573                 int save_nr;
574
575                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
576                         continue;
577                 if (has_head)
578                         old = read_one_ent(NULL, head_sha1,
579                                            ce->name, ce_namelen(ce), 0);
580                 if (old && ce->ce_mode == old->ce_mode &&
581                     !memcmp(ce->sha1, old->sha1, 20)) {
582                         free(old);
583                         continue; /* unchanged */
584                 }
585                 /* Be careful.  The working tree may not have the
586                  * path anymore, in which case, under 'allow_remove',
587                  * or worse yet 'allow_replace', active_nr may decrease.
588                  */
589                 save_nr = active_nr;
590                 update_one(ce->name + prefix_length, prefix, prefix_length);
591                 if (save_nr != active_nr)
592                         goto redo;
593         }
594         return 0;
595 }
596
597 int main(int argc, const char **argv)
598 {
599         int i, newfd, entries, has_errors = 0, line_termination = '\n';
600         int allow_options = 1;
601         int read_from_stdin = 0;
602         const char *prefix = setup_git_directory();
603         int prefix_length = prefix ? strlen(prefix) : 0;
604         char set_executable_bit = 0;
605
606         git_config(git_default_config);
607
608         newfd = hold_index_file_for_update(&cache_file, get_index_file());
609         if (newfd < 0)
610                 die("unable to create new cachefile");
611
612         entries = read_cache();
613         if (entries < 0)
614                 die("cache corrupted");
615
616         for (i = 1 ; i < argc; i++) {
617                 const char *path = argv[i];
618
619                 if (allow_options && *path == '-') {
620                         if (!strcmp(path, "--")) {
621                                 allow_options = 0;
622                                 continue;
623                         }
624                         if (!strcmp(path, "-q")) {
625                                 quiet = 1;
626                                 continue;
627                         }
628                         if (!strcmp(path, "--add")) {
629                                 allow_add = 1;
630                                 continue;
631                         }
632                         if (!strcmp(path, "--replace")) {
633                                 allow_replace = 1;
634                                 continue;
635                         }
636                         if (!strcmp(path, "--remove")) {
637                                 allow_remove = 1;
638                                 continue;
639                         }
640                         if (!strcmp(path, "--unmerged")) {
641                                 allow_unmerged = 1;
642                                 continue;
643                         }
644                         if (!strcmp(path, "--refresh")) {
645                                 has_errors |= refresh_cache(0);
646                                 continue;
647                         }
648                         if (!strcmp(path, "--really-refresh")) {
649                                 has_errors |= refresh_cache(1);
650                                 continue;
651                         }
652                         if (!strcmp(path, "--cacheinfo")) {
653                                 unsigned char sha1[20];
654                                 unsigned int mode;
655
656                                 if (i+3 >= argc)
657                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
658
659                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
660                                     get_sha1_hex(argv[i+2], sha1) ||
661                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
662                                         die("git-update-index: --cacheinfo"
663                                             " cannot add %s", argv[i+3]);
664                                 i += 3;
665                                 continue;
666                         }
667                         if (!strcmp(path, "--chmod=-x") ||
668                             !strcmp(path, "--chmod=+x")) {
669                                 if (argc <= i+1)
670                                         die("git-update-index: %s <path>", path);
671                                 set_executable_bit = path[8];
672                                 continue;
673                         }
674                         if (!strcmp(path, "--assume-unchanged")) {
675                                 mark_valid_only = MARK_VALID;
676                                 continue;
677                         }
678                         if (!strcmp(path, "--no-assume-unchanged")) {
679                                 mark_valid_only = UNMARK_VALID;
680                                 continue;
681                         }
682                         if (!strcmp(path, "--info-only")) {
683                                 info_only = 1;
684                                 continue;
685                         }
686                         if (!strcmp(path, "--force-remove")) {
687                                 force_remove = 1;
688                                 continue;
689                         }
690                         if (!strcmp(path, "-z")) {
691                                 line_termination = 0;
692                                 continue;
693                         }
694                         if (!strcmp(path, "--stdin")) {
695                                 if (i != argc - 1)
696                                         die("--stdin must be at the end");
697                                 read_from_stdin = 1;
698                                 break;
699                         }
700                         if (!strcmp(path, "--index-info")) {
701                                 if (i != argc - 1)
702                                         die("--index-info must be at the end");
703                                 allow_add = allow_replace = allow_remove = 1;
704                                 read_index_info(line_termination);
705                                 break;
706                         }
707                         if (!strcmp(path, "--unresolve")) {
708                                 has_errors = do_unresolve(argc - i, argv + i,
709                                                           prefix, prefix_length);
710                                 if (has_errors)
711                                         active_cache_changed = 0;
712                                 goto finish;
713                         }
714                         if (!strcmp(path, "--again")) {
715                                 has_errors = do_reupdate(argc - i, argv + i,
716                                                          prefix, prefix_length);
717                                 if (has_errors)
718                                         active_cache_changed = 0;
719                                 goto finish;
720                         }
721                         if (!strcmp(path, "--ignore-missing")) {
722                                 not_new = 1;
723                                 continue;
724                         }
725                         if (!strcmp(path, "--verbose")) {
726                                 verbose = 1;
727                                 continue;
728                         }
729                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
730                                 usage(update_index_usage);
731                         die("unknown option %s", path);
732                 }
733                 update_one(path, prefix, prefix_length);
734                 if (set_executable_bit)
735                         chmod_path(set_executable_bit, path);
736         }
737         if (read_from_stdin) {
738                 struct strbuf buf;
739                 strbuf_init(&buf);
740                 while (1) {
741                         char *path_name;
742                         const char *p;
743                         read_line(&buf, stdin, line_termination);
744                         if (buf.eof)
745                                 break;
746                         if (line_termination && buf.buf[0] == '"')
747                                 path_name = unquote_c_style(buf.buf, NULL);
748                         else
749                                 path_name = buf.buf;
750                         p = prefix_path(prefix, prefix_length, path_name);
751                         update_one(p, NULL, 0);
752                         if (set_executable_bit)
753                                 chmod_path(set_executable_bit, p);
754                         if (p < path_name || p > path_name + strlen(path_name))
755                                 free((char*) p);
756                         if (path_name != buf.buf)
757                                 free(path_name);
758                 }
759         }
760
761  finish:
762         if (active_cache_changed) {
763                 if (write_cache(newfd, active_cache, active_nr) ||
764                     commit_index_file(&cache_file))
765                         die("Unable to write new cachefile");
766         }
767
768         return has_errors ? 1 : 0;
769 }