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 "tree-walk.h"
10/*
12 * Default to not allowing changes to the list of files. The
13 * tool doesn't actually care, but this makes it harder to add
14 * files to the revision control by mistake by doing something
15 * like "git-update-index *" and suddenly having all the object
16 * files be revision controlled.
17 */
18static int allow_add;
19static int allow_remove;
20static int allow_replace;
21static int allow_unmerged; /* --refresh needing merge is not error */
22static int not_new; /* --refresh not having working tree files is not error */
23static int quiet; /* --refresh needing update is not error */
24static int info_only;
25static int force_remove;
26static int verbose;
27static int mark_valid_only = 0;
28#define MARK_VALID 1
29#define UNMARK_VALID 2
30/* Three functions to allow overloaded pointer return; see linux/err.h */
33static inline void *ERR_PTR(long error)
34{
35 return (void *) error;
36}
37static inline long PTR_ERR(const void *ptr)
39{
40 return (long) ptr;
41}
42static inline long IS_ERR(const void *ptr)
44{
45 return (unsigned long)ptr > (unsigned long)-1000L;
46}
47static void report(const char *fmt, ...)
49{
50 va_list vp;
51 if (!verbose)
53 return;
54 va_start(vp, fmt);
56 vprintf(fmt, vp);
57 putchar('\n');
58 va_end(vp);
59}
60static int mark_valid(const char *path)
62{
63 int namelen = strlen(path);
64 int pos = cache_name_pos(path, namelen);
65 if (0 <= pos) {
66 switch (mark_valid_only) {
67 case MARK_VALID:
68 active_cache[pos]->ce_flags |= htons(CE_VALID);
69 break;
70 case UNMARK_VALID:
71 active_cache[pos]->ce_flags &= ~htons(CE_VALID);
72 break;
73 }
74 active_cache_changed = 1;
75 return 0;
76 }
77 return -1;
78}
79static int add_file_to_cache(const char *path)
81{
82 int size, namelen, option, status;
83 struct cache_entry *ce;
84 struct stat st;
85 status = lstat(path, &st);
87 if (status < 0 || S_ISDIR(st.st_mode)) {
88 /* When we used to have "path" and now we want to add
89 * "path/file", we need a way to remove "path" before
90 * being able to add "path/file". However,
91 * "git-update-index --remove path" would not work.
92 * --force-remove can be used but this is more user
93 * friendly, especially since we can do the opposite
94 * case just fine without --force-remove.
95 */
96 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
97 if (allow_remove) {
98 if (remove_file_from_cache(path))
99 return error("%s: cannot remove from the index",
100 path);
101 else
102 return 0;
103 } else if (status < 0) {
104 return error("%s: does not exist and --remove not passed",
105 path);
106 }
107 }
108 if (0 == status)
109 return error("%s: is a directory - add files inside instead",
110 path);
111 else
112 return error("lstat(\"%s\"): %s", path,
113 strerror(errno));
114 }
115 namelen = strlen(path);
117 size = cache_entry_size(namelen);
118 ce = xcalloc(1, size);
119 memcpy(ce->name, path, namelen);
120 ce->ce_flags = htons(namelen);
121 fill_stat_cache_info(ce, &st);
122 ce->ce_mode = create_ce_mode(st.st_mode);
124 if (!trust_executable_bit) {
125 /* If there is an existing entry, pick the mode bits
126 * from it.
127 */
128 int pos = cache_name_pos(path, namelen);
129 if (0 <= pos)
130 ce->ce_mode = active_cache[pos]->ce_mode;
131 }
132 if (index_path(ce->sha1, path, &st, !info_only))
134 return -1;
135 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
136 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
137 if (add_cache_entry(ce, option))
138 return error("%s: cannot add to the index - missing --add option?",
139 path);
140 return 0;
141}
142/*
144 * "refresh" does not calculate a new sha1 file or bring the
145 * cache up-to-date for mode/content changes. But what it
146 * _does_ do is to "re-match" the stat information of a file
147 * with the cache, so that you can refresh the cache for a
148 * file that hasn't been changed but where the stat entry is
149 * out of date.
150 *
151 * For example, you'd want to do this after doing a "git-read-tree",
152 * to link up the stat cache details with the proper files.
153 */
154static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
155{
156 struct stat st;
157 struct cache_entry *updated;
158 int changed, size;
159 if (lstat(ce->name, &st) < 0)
161 return ERR_PTR(-errno);
162 changed = ce_match_stat(ce, &st, really);
164 if (!changed) {
165 if (really && assume_unchanged &&
166 !(ce->ce_flags & htons(CE_VALID)))
167 ; /* mark this one VALID again */
168 else
169 return NULL;
170 }
171 if (ce_modified(ce, &st, really))
173 return ERR_PTR(-EINVAL);
174 size = ce_size(ce);
176 updated = xmalloc(size);
177 memcpy(updated, ce, size);
178 fill_stat_cache_info(updated, &st);
179 /* In this case, if really is not set, we should leave
181 * CE_VALID bit alone. Otherwise, paths marked with
182 * --no-assume-unchanged (i.e. things to be edited) will
183 * reacquire CE_VALID bit automatically, which is not
184 * really what we want.
185 */
186 if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
187 updated->ce_flags &= ~htons(CE_VALID);
188 return updated;
190}
191static int refresh_cache(int really)
193{
194 int i;
195 int has_errors = 0;
196 for (i = 0; i < active_nr; i++) {
198 struct cache_entry *ce, *new;
199 ce = active_cache[i];
200 if (ce_stage(ce)) {
201 while ((i < active_nr) &&
202 ! strcmp(active_cache[i]->name, ce->name))
203 i++;
204 i--;
205 if (allow_unmerged)
206 continue;
207 printf("%s: needs merge\n", ce->name);
208 has_errors = 1;
209 continue;
210 }
211 new = refresh_entry(ce, really);
213 if (!new)
214 continue;
215 if (IS_ERR(new)) {
216 if (not_new && PTR_ERR(new) == -ENOENT)
217 continue;
218 if (really && PTR_ERR(new) == -EINVAL) {
219 /* If we are doing --really-refresh that
220 * means the index is not valid anymore.
221 */
222 ce->ce_flags &= ~htons(CE_VALID);
223 active_cache_changed = 1;
224 }
225 if (quiet)
226 continue;
227 printf("%s: needs update\n", ce->name);
228 has_errors = 1;
229 continue;
230 }
231 active_cache_changed = 1;
232 /* You can NOT just free active_cache[i] here, since it
233 * might not be necessarily malloc()ed but can also come
234 * from mmap(). */
235 active_cache[i] = new;
236 }
237 return has_errors;
238}
239/*
241 * We fundamentally don't like some paths: we don't want
242 * dot or dot-dot anywhere, and for obvious reasons don't
243 * want to recurse into ".git" either.
244 *
245 * Also, we don't want double slashes or slashes at the
246 * end that can make pathnames ambiguous.
247 */
248static int verify_dotfile(const char *rest)
249{
250 /*
251 * The first character was '.', but that
252 * has already been discarded, we now test
253 * the rest.
254 */
255 switch (*rest) {
256 /* "." is not allowed */
257 case '\0': case '/':
258 return 0;
259 /*
261 * ".git" followed by NUL or slash is bad. This
262 * shares the path end test with the ".." case.
263 */
264 case 'g':
265 if (rest[1] != 'i')
266 break;
267 if (rest[2] != 't')
268 break;
269 rest += 2;
270 /* fallthrough */
271 case '.':
272 if (rest[1] == '\0' || rest[1] == '/')
273 return 0;
274 }
275 return 1;
276}
277static int verify_path(const char *path)
279{
280 char c;
281 goto inside;
283 for (;;) {
284 if (!c)
285 return 1;
286 if (c == '/') {
287inside:
288 c = *path++;
289 switch (c) {
290 default:
291 continue;
292 case '/': case '\0':
293 break;
294 case '.':
295 if (verify_dotfile(path))
296 continue;
297 }
298 return 0;
299 }
300 c = *path++;
301 }
302}
303static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
305 const char *path, int stage)
306{
307 int size, len, option;
308 struct cache_entry *ce;
309 if (!verify_path(path))
311 return -1;
312 len = strlen(path);
314 size = cache_entry_size(len);
315 ce = xcalloc(1, size);
316 memcpy(ce->sha1, sha1, 20);
318 memcpy(ce->name, path, len);
319 ce->ce_flags = create_ce_flags(len, stage);
320 ce->ce_mode = create_ce_mode(mode);
321 if (assume_unchanged)
322 ce->ce_flags |= htons(CE_VALID);
323 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
324 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
325 if (add_cache_entry(ce, option))
326 return error("%s: cannot add to the index - missing --add option?",
327 path);
328 report("add '%s'", path);
329 return 0;
330}
331static void chmod_path(int flip, const char *path)
333{
334 int pos;
335 struct cache_entry *ce;
336 unsigned int mode;
337 pos = cache_name_pos(path, strlen(path));
339 if (pos < 0)
340 goto fail;
341 ce = active_cache[pos];
342 mode = ntohl(ce->ce_mode);
343 if (!S_ISREG(mode))
344 goto fail;
345 switch (flip) {
346 case '+':
347 ce->ce_mode |= htonl(0111); break;
348 case '-':
349 ce->ce_mode &= htonl(~0111); break;
350 default:
351 goto fail;
352 }
353 active_cache_changed = 1;
354 report("chmod %cx '%s'", flip, path);
355 return;
356 fail:
357 die("git-update-index: cannot chmod %cx '%s'", flip, path);
358}
359static struct cache_file cache_file;
361static void update_one(const char *path, const char *prefix, int prefix_length)
363{
364 const char *p = prefix_path(prefix, prefix_length, path);
365 if (!verify_path(p)) {
366 fprintf(stderr, "Ignoring path %s\n", path);
367 return;
368 }
369 if (mark_valid_only) {
370 if (mark_valid(p))
371 die("Unable to mark file %s", path);
372 return;
373 }
374 if (force_remove) {
376 if (remove_file_from_cache(p))
377 die("git-update-index: unable to remove %s", path);
378 report("remove '%s'", path);
379 return;
380 }
381 if (add_file_to_cache(p))
382 die("Unable to process file %s", path);
383 report("add '%s'", path);
384}
385static void read_index_info(int line_termination)
387{
388 struct strbuf buf;
389 strbuf_init(&buf);
390 while (1) {
391 char *ptr, *tab;
392 char *path_name;
393 unsigned char sha1[20];
394 unsigned int mode;
395 int stage;
396 /* This reads lines formatted in one of three formats:
398 *
399 * (1) mode SP sha1 TAB path
400 * The first format is what "git-apply --index-info"
401 * reports, and used to reconstruct a partial tree
402 * that is used for phony merge base tree when falling
403 * back on 3-way merge.
404 *
405 * (2) mode SP type SP sha1 TAB path
406 * The second format is to stuff git-ls-tree output
407 * into the index file.
408 *
409 * (3) mode SP sha1 SP stage TAB path
410 * This format is to put higher order stages into the
411 * index file and matches git-ls-files --stage output.
412 */
413 read_line(&buf, stdin, line_termination);
414 if (buf.eof)
415 break;
416 mode = strtoul(buf.buf, &ptr, 8);
418 if (ptr == buf.buf || *ptr != ' ')
419 goto bad_line;
420 tab = strchr(ptr, '\t');
422 if (!tab || tab - ptr < 41)
423 goto bad_line;
424 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
426 stage = tab[-1] - '0';
427 ptr = tab + 1; /* point at the head of path */
428 tab = tab - 2; /* point at tail of sha1 */
429 }
430 else {
431 stage = 0;
432 ptr = tab + 1; /* point at the head of path */
433 }
434 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
436 goto bad_line;
437 if (line_termination && ptr[0] == '"')
439 path_name = unquote_c_style(ptr, NULL);
440 else
441 path_name = ptr;
442 if (!verify_path(path_name)) {
444 fprintf(stderr, "Ignoring path %s\n", path_name);
445 if (path_name != ptr)
446 free(path_name);
447 continue;
448 }
449 if (!mode) {
451 /* mode == 0 means there is no such path -- remove */
452 if (remove_file_from_cache(path_name))
453 die("git-update-index: unable to remove %s",
454 ptr);
455 }
456 else {
457 /* mode ' ' sha1 '\t' name
458 * ptr[-1] points at tab,
459 * ptr[-41] is at the beginning of sha1
460 */
461 ptr[-42] = ptr[-1] = 0;
462 if (add_cacheinfo(mode, sha1, path_name, stage))
463 die("git-update-index: unable to update %s",
464 path_name);
465 }
466 if (path_name != ptr)
467 free(path_name);
468 continue;
469 bad_line:
471 die("malformed index info %s", buf.buf);
472 }
473}
474static const char update_index_usage[] =
476"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
477static unsigned char head_sha1[20];
479static unsigned char merge_head_sha1[20];
480static struct cache_entry *read_one_ent(const char *which,
482 unsigned char *ent, const char *path,
483 int namelen, int stage)
484{
485 unsigned mode;
486 unsigned char sha1[20];
487 int size;
488 struct cache_entry *ce;
489 if (get_tree_entry(ent, path, sha1, &mode)) {
491 error("%s: not in %s branch.", path, which);
492 return NULL;
493 }
494 if (mode == S_IFDIR) {
495 error("%s: not a blob in %s branch.", path, which);
496 return NULL;
497 }
498 size = cache_entry_size(namelen);
499 ce = xcalloc(1, size);
500 memcpy(ce->sha1, sha1, 20);
502 memcpy(ce->name, path, namelen);
503 ce->ce_flags = create_ce_flags(namelen, stage);
504 ce->ce_mode = create_ce_mode(mode);
505 return ce;
506}
507static int unresolve_one(const char *path)
509{
510 int namelen = strlen(path);
511 int pos;
512 int ret = 0;
513 struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
514 /* See if there is such entry in the index. */
516 pos = cache_name_pos(path, namelen);
517 if (pos < 0) {
518 /* If there isn't, either it is unmerged, or
519 * resolved as "removed" by mistake. We do not
520 * want to do anything in the former case.
521 */
522 pos = -pos-1;
523 if (pos < active_nr) {
524 struct cache_entry *ce = active_cache[pos];
525 if (ce_namelen(ce) == namelen &&
526 !memcmp(ce->name, path, namelen)) {
527 fprintf(stderr,
528 "%s: skipping still unmerged path.\n",
529 path);
530 goto free_return;
531 }
532 }
533 }
534 /* Grab blobs from given path from HEAD and MERGE_HEAD,
536 * stuff HEAD version in stage #2,
537 * stuff MERGE_HEAD version in stage #3.
538 */
539 ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
540 ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
541 if (!ce_2 || !ce_3) {
543 ret = -1;
544 goto free_return;
545 }
546 if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
547 ce_2->ce_mode == ce_3->ce_mode) {
548 fprintf(stderr, "%s: identical in both, skipping.\n",
549 path);
550 goto free_return;
551 }
552 remove_file_from_cache(path);
554 if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
555 error("%s: cannot add our version to the index.", path);
556 ret = -1;
557 goto free_return;
558 }
559 if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
560 return 0;
561 error("%s: cannot add their version to the index.", path);
562 ret = -1;
563 free_return:
564 free(ce_2);
565 free(ce_3);
566 return ret;
567}
568static void read_head_pointers(void)
570{
571 if (read_ref(git_path("HEAD"), head_sha1))
572 die("No HEAD -- no initial commit yet?\n");
573 if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
574 fprintf(stderr, "Not in the middle of a merge.\n");
575 exit(0);
576 }
577}
578static int do_unresolve(int ac, const char **av)
580{
581 int i;
582 int err = 0;
583 /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
585 * are not doing a merge, so exit with success status.
586 */
587 read_head_pointers();
588 for (i = 1; i < ac; i++) {
590 const char *arg = av[i];
591 err |= unresolve_one(arg);
592 }
593 return err;
594}
595int main(int argc, const char **argv)
597{
598 int i, newfd, entries, has_errors = 0, line_termination = '\n';
599 int allow_options = 1;
600 int read_from_stdin = 0;
601 const char *prefix = setup_git_directory();
602 int prefix_length = prefix ? strlen(prefix) : 0;
603 char set_executable_bit = 0;
604 git_config(git_default_config);
606 newfd = hold_index_file_for_update(&cache_file, get_index_file());
608 if (newfd < 0)
609 die("unable to create new cachefile");
610 entries = read_cache();
612 if (entries < 0)
613 die("cache corrupted");
614 for (i = 1 ; i < argc; i++) {
616 const char *path = argv[i];
617 if (allow_options && *path == '-') {
619 if (!strcmp(path, "--")) {
620 allow_options = 0;
621 continue;
622 }
623 if (!strcmp(path, "-q")) {
624 quiet = 1;
625 continue;
626 }
627 if (!strcmp(path, "--add")) {
628 allow_add = 1;
629 continue;
630 }
631 if (!strcmp(path, "--replace")) {
632 allow_replace = 1;
633 continue;
634 }
635 if (!strcmp(path, "--remove")) {
636 allow_remove = 1;
637 continue;
638 }
639 if (!strcmp(path, "--unmerged")) {
640 allow_unmerged = 1;
641 continue;
642 }
643 if (!strcmp(path, "--refresh")) {
644 has_errors |= refresh_cache(0);
645 continue;
646 }
647 if (!strcmp(path, "--really-refresh")) {
648 has_errors |= refresh_cache(1);
649 continue;
650 }
651 if (!strcmp(path, "--cacheinfo")) {
652 unsigned char sha1[20];
653 unsigned int mode;
654 if (i+3 >= argc)
656 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
657 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
659 get_sha1_hex(argv[i+2], sha1) ||
660 add_cacheinfo(mode, sha1, argv[i+3], 0))
661 die("git-update-index: --cacheinfo"
662 " cannot add %s", argv[i+3]);
663 i += 3;
664 continue;
665 }
666 if (!strcmp(path, "--chmod=-x") ||
667 !strcmp(path, "--chmod=+x")) {
668 if (argc <= i+1)
669 die("git-update-index: %s <path>", path);
670 set_executable_bit = path[8];
671 continue;
672 }
673 if (!strcmp(path, "--assume-unchanged")) {
674 mark_valid_only = MARK_VALID;
675 continue;
676 }
677 if (!strcmp(path, "--no-assume-unchanged")) {
678 mark_valid_only = UNMARK_VALID;
679 continue;
680 }
681 if (!strcmp(path, "--info-only")) {
682 info_only = 1;
683 continue;
684 }
685 if (!strcmp(path, "--force-remove")) {
686 force_remove = 1;
687 continue;
688 }
689 if (!strcmp(path, "-z")) {
690 line_termination = 0;
691 continue;
692 }
693 if (!strcmp(path, "--stdin")) {
694 if (i != argc - 1)
695 die("--stdin must be at the end");
696 read_from_stdin = 1;
697 break;
698 }
699 if (!strcmp(path, "--index-info")) {
700 if (i != argc - 1)
701 die("--index-info must be at the end");
702 allow_add = allow_replace = allow_remove = 1;
703 read_index_info(line_termination);
704 break;
705 }
706 if (!strcmp(path, "--unresolve")) {
707 has_errors = do_unresolve(argc - i, argv + i);
708 if (has_errors)
709 active_cache_changed = 0;
710 goto finish;
711 }
712 if (!strcmp(path, "--ignore-missing")) {
713 not_new = 1;
714 continue;
715 }
716 if (!strcmp(path, "--verbose")) {
717 verbose = 1;
718 continue;
719 }
720 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
721 usage(update_index_usage);
722 die("unknown option %s", path);
723 }
724 update_one(path, prefix, prefix_length);
725 if (set_executable_bit)
726 chmod_path(set_executable_bit, path);
727 }
728 if (read_from_stdin) {
729 struct strbuf buf;
730 strbuf_init(&buf);
731 while (1) {
732 char *path_name;
733 read_line(&buf, stdin, line_termination);
734 if (buf.eof)
735 break;
736 if (line_termination && buf.buf[0] == '"')
737 path_name = unquote_c_style(buf.buf, NULL);
738 else
739 path_name = buf.buf;
740 update_one(path_name, prefix, prefix_length);
741 if (set_executable_bit) {
742 const char *p = prefix_path(prefix, prefix_length, path_name);
743 chmod_path(set_executable_bit, p);
744 }
745 if (path_name != buf.buf)
746 free(path_name);
747 }
748 }
749 finish:
751 if (active_cache_changed) {
752 if (write_cache(newfd, active_cache, active_nr) ||
753 commit_index_file(&cache_file))
754 die("Unable to write new cachefile");
755 }
756 return has_errors ? 1 : 0;
758}