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/*
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 */
20static int allow_add;
21static int allow_remove;
22static int allow_replace;
23static int info_only;
24static int force_remove;
25static int verbose;
26static int mark_valid_only;
27#define MARK_VALID 1
28#define UNMARK_VALID 2
29static void report(const char *fmt, ...)
31{
32 va_list vp;
33 if (!verbose)
35 return;
36 va_start(vp, fmt);
38 vprintf(fmt, vp);
39 putchar('\n');
40 va_end(vp);
41}
42static int mark_valid(const char *path)
44{
45 int namelen = strlen(path);
46 int pos = cache_name_pos(path, namelen);
47 if (0 <= pos) {
48 switch (mark_valid_only) {
49 case MARK_VALID:
50 active_cache[pos]->ce_flags |= CE_VALID;
51 break;
52 case UNMARK_VALID:
53 active_cache[pos]->ce_flags &= ~CE_VALID;
54 break;
55 }
56 cache_tree_invalidate_path(active_cache_tree, path);
57 active_cache_changed = 1;
58 return 0;
59 }
60 return -1;
61}
62static int remove_one_path(const char *path)
64{
65 if (!allow_remove)
66 return error("%s: does not exist and --remove not passed", path);
67 if (remove_file_from_cache(path))
68 return error("%s: cannot remove from the index", path);
69 return 0;
70}
71/*
73 * Handle a path that couldn't be lstat'ed. It's either:
74 * - missing file (ENOENT or ENOTDIR). That's ok if we're
75 * supposed to be removing it and the removal actually
76 * succeeds.
77 * - permission error. That's never ok.
78 */
79static int process_lstat_error(const char *path, int err)
80{
81 if (err == ENOENT || err == ENOTDIR)
82 return remove_one_path(path);
83 return error("lstat(\"%s\"): %s", path, strerror(errno));
84}
85static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
87{
88 int option, size;
89 struct cache_entry *ce;
90 /* Was the old index entry already up-to-date? */
92 if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
93 return 0;
94 size = cache_entry_size(len);
96 ce = xcalloc(1, size);
97 memcpy(ce->name, path, len);
98 ce->ce_flags = len;
99 fill_stat_cache_info(ce, st);
100 ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
101 if (index_path(ce->sha1, path, st, !info_only))
103 return -1;
104 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
105 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
106 if (add_cache_entry(ce, option))
107 return error("%s: cannot add to the index - missing --add option?", path);
108 return 0;
109}
110/*
112 * Handle a path that was a directory. Four cases:
113 *
114 * - it's already a gitlink in the index, and we keep it that
115 * way, and update it if we can (if we cannot find the HEAD,
116 * we're going to keep it unchanged in the index!)
117 *
118 * - it's a *file* in the index, in which case it should be
119 * removed as a file if removal is allowed, since it doesn't
120 * exist as such any more. If removal isn't allowed, it's
121 * an error.
122 *
123 * (NOTE! This is old and arguably fairly strange behaviour.
124 * We might want to make this an error unconditionally, and
125 * use "--force-remove" if you actually want to force removal).
126 *
127 * - it used to exist as a subdirectory (ie multiple files with
128 * this particular prefix) in the index, in which case it's wrong
129 * to try to update it as a directory.
130 *
131 * - it doesn't exist at all in the index, but it is a valid
132 * git directory, and it should be *added* as a gitlink.
133 */
134static int process_directory(const char *path, int len, struct stat *st)
135{
136 unsigned char sha1[20];
137 int pos = cache_name_pos(path, len);
138 /* Exact match: file or existing gitlink */
140 if (pos >= 0) {
141 struct cache_entry *ce = active_cache[pos];
142 if (S_ISGITLINK(ce->ce_mode)) {
143 /* Do nothing to the index if there is no HEAD! */
145 if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
146 return 0;
147 return add_one_path(ce, path, len, st);
149 }
150 /* Should this be an unconditional error? */
151 return remove_one_path(path);
152 }
153 /* Inexact match: is there perhaps a subdirectory match? */
155 pos = -pos-1;
156 while (pos < active_nr) {
157 struct cache_entry *ce = active_cache[pos++];
158 if (strncmp(ce->name, path, len))
160 break;
161 if (ce->name[len] > '/')
162 break;
163 if (ce->name[len] < '/')
164 continue;
165 /* Subdirectory match - error out */
167 return error("%s: is a directory - add individual files instead", path);
168 }
169 /* No match - should we add it as a gitlink? */
171 if (!resolve_gitlink_ref(path, "HEAD", sha1))
172 return add_one_path(NULL, path, len, st);
173 /* Error out. */
175 return error("%s: is a directory - add files inside instead", path);
176}
177/*
179 * Process a regular file
180 */
181static int process_file(const char *path, int len, struct stat *st)
182{
183 int pos = cache_name_pos(path, len);
184 struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
185 if (ce && S_ISGITLINK(ce->ce_mode))
187 return error("%s is already a gitlink, not replacing", path);
188 return add_one_path(ce, path, len, st);
190}
191static int process_path(const char *path)
193{
194 int len;
195 struct stat st;
196 len = strlen(path);
198 if (has_symlink_leading_path(len, path))
199 return error("'%s' is beyond a symbolic link", path);
200 /*
202 * First things first: get the stat information, to decide
203 * what to do about the pathname!
204 */
205 if (lstat(path, &st) < 0)
206 return process_lstat_error(path, errno);
207 if (S_ISDIR(st.st_mode))
209 return process_directory(path, len, &st);
210 return process_file(path, len, &st);
212}
213static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
215 const char *path, int stage)
216{
217 int size, len, option;
218 struct cache_entry *ce;
219 if (!verify_path(path))
221 return -1;
222 len = strlen(path);
224 size = cache_entry_size(len);
225 ce = xcalloc(1, size);
226 hashcpy(ce->sha1, sha1);
228 memcpy(ce->name, path, len);
229 ce->ce_flags = create_ce_flags(len, stage);
230 ce->ce_mode = create_ce_mode(mode);
231 if (assume_unchanged)
232 ce->ce_flags |= CE_VALID;
233 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
234 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
235 if (add_cache_entry(ce, option))
236 return error("%s: cannot add to the index - missing --add option?",
237 path);
238 report("add '%s'", path);
239 return 0;
240}
241static void chmod_path(int flip, const char *path)
243{
244 int pos;
245 struct cache_entry *ce;
246 unsigned int mode;
247 pos = cache_name_pos(path, strlen(path));
249 if (pos < 0)
250 goto fail;
251 ce = active_cache[pos];
252 mode = ce->ce_mode;
253 if (!S_ISREG(mode))
254 goto fail;
255 switch (flip) {
256 case '+':
257 ce->ce_mode |= 0111; break;
258 case '-':
259 ce->ce_mode &= ~0111; break;
260 default:
261 goto fail;
262 }
263 cache_tree_invalidate_path(active_cache_tree, path);
264 active_cache_changed = 1;
265 report("chmod %cx '%s'", flip, path);
266 return;
267 fail:
268 die("git update-index: cannot chmod %cx '%s'", flip, path);
269}
270static void update_one(const char *path, const char *prefix, int prefix_length)
272{
273 const char *p = prefix_path(prefix, prefix_length, path);
274 if (!verify_path(p)) {
275 fprintf(stderr, "Ignoring path %s\n", path);
276 goto free_return;
277 }
278 if (mark_valid_only) {
279 if (mark_valid(p))
280 die("Unable to mark file %s", path);
281 goto free_return;
282 }
283 if (force_remove) {
285 if (remove_file_from_cache(p))
286 die("git update-index: unable to remove %s", path);
287 report("remove '%s'", path);
288 goto free_return;
289 }
290 if (process_path(p))
291 die("Unable to process path %s", path);
292 report("add '%s'", path);
293 free_return:
294 if (p < path || p > path + strlen(path))
295 free((char*)p);
296}
297static void read_index_info(int line_termination)
299{
300 struct strbuf buf;
301 struct strbuf uq;
302 strbuf_init(&buf, 0);
304 strbuf_init(&uq, 0);
305 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
306 char *ptr, *tab;
307 char *path_name;
308 unsigned char sha1[20];
309 unsigned int mode;
310 unsigned long ul;
311 int stage;
312 /* This reads lines formatted in one of three formats:
314 *
315 * (1) mode SP sha1 TAB path
316 * The first format is what "git apply --index-info"
317 * reports, and used to reconstruct a partial tree
318 * that is used for phony merge base tree when falling
319 * back on 3-way merge.
320 *
321 * (2) mode SP type SP sha1 TAB path
322 * The second format is to stuff "git ls-tree" output
323 * into the index file.
324 *
325 * (3) mode SP sha1 SP stage TAB path
326 * This format is to put higher order stages into the
327 * index file and matches "git ls-files --stage" output.
328 */
329 errno = 0;
330 ul = strtoul(buf.buf, &ptr, 8);
331 if (ptr == buf.buf || *ptr != ' '
332 || errno || (unsigned int) ul != ul)
333 goto bad_line;
334 mode = ul;
335 tab = strchr(ptr, '\t');
337 if (!tab || tab - ptr < 41)
338 goto bad_line;
339 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
341 stage = tab[-1] - '0';
342 ptr = tab + 1; /* point at the head of path */
343 tab = tab - 2; /* point at tail of sha1 */
344 }
345 else {
346 stage = 0;
347 ptr = tab + 1; /* point at the head of path */
348 }
349 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
351 goto bad_line;
352 path_name = ptr;
354 if (line_termination && path_name[0] == '"') {
355 strbuf_reset(&uq);
356 if (unquote_c_style(&uq, path_name, NULL)) {
357 die("git update-index: bad quoting of path name");
358 }
359 path_name = uq.buf;
360 }
361 if (!verify_path(path_name)) {
363 fprintf(stderr, "Ignoring path %s\n", path_name);
364 continue;
365 }
366 if (!mode) {
368 /* mode == 0 means there is no such path -- remove */
369 if (remove_file_from_cache(path_name))
370 die("git update-index: unable to remove %s",
371 ptr);
372 }
373 else {
374 /* mode ' ' sha1 '\t' name
375 * ptr[-1] points at tab,
376 * ptr[-41] is at the beginning of sha1
377 */
378 ptr[-42] = ptr[-1] = 0;
379 if (add_cacheinfo(mode, sha1, path_name, stage))
380 die("git update-index: unable to update %s",
381 path_name);
382 }
383 continue;
384 bad_line:
386 die("malformed index info %s", buf.buf);
387 }
388 strbuf_release(&buf);
389 strbuf_release(&uq);
390}
391static const char update_index_usage[] =
393"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>...";
394static unsigned char head_sha1[20];
396static unsigned char merge_head_sha1[20];
397static struct cache_entry *read_one_ent(const char *which,
399 unsigned char *ent, const char *path,
400 int namelen, int stage)
401{
402 unsigned mode;
403 unsigned char sha1[20];
404 int size;
405 struct cache_entry *ce;
406 if (get_tree_entry(ent, path, sha1, &mode)) {
408 if (which)
409 error("%s: not in %s branch.", path, which);
410 return NULL;
411 }
412 if (mode == S_IFDIR) {
413 if (which)
414 error("%s: not a blob in %s branch.", path, which);
415 return NULL;
416 }
417 size = cache_entry_size(namelen);
418 ce = xcalloc(1, size);
419 hashcpy(ce->sha1, sha1);
421 memcpy(ce->name, path, namelen);
422 ce->ce_flags = create_ce_flags(namelen, stage);
423 ce->ce_mode = create_ce_mode(mode);
424 return ce;
425}
426static int unresolve_one(const char *path)
428{
429 int namelen = strlen(path);
430 int pos;
431 int ret = 0;
432 struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
433 /* See if there is such entry in the index. */
435 pos = cache_name_pos(path, namelen);
436 if (pos < 0) {
437 /* If there isn't, either it is unmerged, or
438 * resolved as "removed" by mistake. We do not
439 * want to do anything in the former case.
440 */
441 pos = -pos-1;
442 if (pos < active_nr) {
443 struct cache_entry *ce = active_cache[pos];
444 if (ce_namelen(ce) == namelen &&
445 !memcmp(ce->name, path, namelen)) {
446 fprintf(stderr,
447 "%s: skipping still unmerged path.\n",
448 path);
449 goto free_return;
450 }
451 }
452 }
453 /* Grab blobs from given path from HEAD and MERGE_HEAD,
455 * stuff HEAD version in stage #2,
456 * stuff MERGE_HEAD version in stage #3.
457 */
458 ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
459 ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
460 if (!ce_2 || !ce_3) {
462 ret = -1;
463 goto free_return;
464 }
465 if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
466 ce_2->ce_mode == ce_3->ce_mode) {
467 fprintf(stderr, "%s: identical in both, skipping.\n",
468 path);
469 goto free_return;
470 }
471 remove_file_from_cache(path);
473 if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
474 error("%s: cannot add our version to the index.", path);
475 ret = -1;
476 goto free_return;
477 }
478 if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
479 return 0;
480 error("%s: cannot add their version to the index.", path);
481 ret = -1;
482 free_return:
483 free(ce_2);
484 free(ce_3);
485 return ret;
486}
487static void read_head_pointers(void)
489{
490 if (read_ref("HEAD", head_sha1))
491 die("No HEAD -- no initial commit yet?\n");
492 if (read_ref("MERGE_HEAD", merge_head_sha1)) {
493 fprintf(stderr, "Not in the middle of a merge.\n");
494 exit(0);
495 }
496}
497static int do_unresolve(int ac, const char **av,
499 const char *prefix, int prefix_length)
500{
501 int i;
502 int err = 0;
503 /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
505 * are not doing a merge, so exit with success status.
506 */
507 read_head_pointers();
508 for (i = 1; i < ac; i++) {
510 const char *arg = av[i];
511 const char *p = prefix_path(prefix, prefix_length, arg);
512 err |= unresolve_one(p);
513 if (p < arg || p > arg + strlen(arg))
514 free((char*)p);
515 }
516 return err;
517}
518static int do_reupdate(int ac, const char **av,
520 const char *prefix, int prefix_length)
521{
522 /* Read HEAD and run update-index on paths that are
523 * merged and already different between index and HEAD.
524 */
525 int pos;
526 int has_head = 1;
527 const char **pathspec = get_pathspec(prefix, av + 1);
528 if (read_ref("HEAD", head_sha1))
530 /* If there is no HEAD, that means it is an initial
531 * commit. Update everything in the index.
532 */
533 has_head = 0;
534 redo:
535 for (pos = 0; pos < active_nr; pos++) {
536 struct cache_entry *ce = active_cache[pos];
537 struct cache_entry *old = NULL;
538 int save_nr;
539 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
541 continue;
542 if (has_head)
543 old = read_one_ent(NULL, head_sha1,
544 ce->name, ce_namelen(ce), 0);
545 if (old && ce->ce_mode == old->ce_mode &&
546 !hashcmp(ce->sha1, old->sha1)) {
547 free(old);
548 continue; /* unchanged */
549 }
550 /* Be careful. The working tree may not have the
551 * path anymore, in which case, under 'allow_remove',
552 * or worse yet 'allow_replace', active_nr may decrease.
553 */
554 save_nr = active_nr;
555 update_one(ce->name + prefix_length, prefix, prefix_length);
556 if (save_nr != active_nr)
557 goto redo;
558 }
559 return 0;
560}
561int cmd_update_index(int argc, const char **argv, const char *prefix)
563{
564 int i, newfd, entries, has_errors = 0, line_termination = '\n';
565 int allow_options = 1;
566 int read_from_stdin = 0;
567 int prefix_length = prefix ? strlen(prefix) : 0;
568 char set_executable_bit = 0;
569 unsigned int refresh_flags = 0;
570 int lock_error = 0;
571 struct lock_file *lock_file;
572 git_config(git_default_config, NULL);
574 /* We can't free this memory, it becomes part of a linked list parsed atexit() */
576 lock_file = xcalloc(1, sizeof(struct lock_file));
577 newfd = hold_locked_index(lock_file, 0);
579 if (newfd < 0)
580 lock_error = errno;
581 entries = read_cache();
583 if (entries < 0)
584 die("cache corrupted");
585 for (i = 1 ; i < argc; i++) {
587 const char *path = argv[i];
588 const char *p;
589 if (allow_options && *path == '-') {
591 if (!strcmp(path, "--")) {
592 allow_options = 0;
593 continue;
594 }
595 if (!strcmp(path, "-q")) {
596 refresh_flags |= REFRESH_QUIET;
597 continue;
598 }
599 if (!strcmp(path, "--ignore-submodules")) {
600 refresh_flags |= REFRESH_IGNORE_SUBMODULES;
601 continue;
602 }
603 if (!strcmp(path, "--add")) {
604 allow_add = 1;
605 continue;
606 }
607 if (!strcmp(path, "--replace")) {
608 allow_replace = 1;
609 continue;
610 }
611 if (!strcmp(path, "--remove")) {
612 allow_remove = 1;
613 continue;
614 }
615 if (!strcmp(path, "--unmerged")) {
616 refresh_flags |= REFRESH_UNMERGED;
617 continue;
618 }
619 if (!strcmp(path, "--refresh")) {
620 setup_work_tree();
621 has_errors |= refresh_cache(refresh_flags);
622 continue;
623 }
624 if (!strcmp(path, "--really-refresh")) {
625 setup_work_tree();
626 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
627 continue;
628 }
629 if (!strcmp(path, "--cacheinfo")) {
630 unsigned char sha1[20];
631 unsigned int mode;
632 if (i+3 >= argc)
634 die("git update-index: --cacheinfo <mode> <sha1> <path>");
635 if (strtoul_ui(argv[i+1], 8, &mode) ||
637 get_sha1_hex(argv[i+2], sha1) ||
638 add_cacheinfo(mode, sha1, argv[i+3], 0))
639 die("git update-index: --cacheinfo"
640 " cannot add %s", argv[i+3]);
641 i += 3;
642 continue;
643 }
644 if (!strcmp(path, "--chmod=-x") ||
645 !strcmp(path, "--chmod=+x")) {
646 if (argc <= i+1)
647 die("git update-index: %s <path>", path);
648 set_executable_bit = path[8];
649 continue;
650 }
651 if (!strcmp(path, "--assume-unchanged")) {
652 mark_valid_only = MARK_VALID;
653 continue;
654 }
655 if (!strcmp(path, "--no-assume-unchanged")) {
656 mark_valid_only = UNMARK_VALID;
657 continue;
658 }
659 if (!strcmp(path, "--info-only")) {
660 info_only = 1;
661 continue;
662 }
663 if (!strcmp(path, "--force-remove")) {
664 force_remove = 1;
665 continue;
666 }
667 if (!strcmp(path, "-z")) {
668 line_termination = 0;
669 continue;
670 }
671 if (!strcmp(path, "--stdin")) {
672 if (i != argc - 1)
673 die("--stdin must be at the end");
674 read_from_stdin = 1;
675 break;
676 }
677 if (!strcmp(path, "--index-info")) {
678 if (i != argc - 1)
679 die("--index-info must be at the end");
680 allow_add = allow_replace = allow_remove = 1;
681 read_index_info(line_termination);
682 break;
683 }
684 if (!strcmp(path, "--unresolve")) {
685 has_errors = do_unresolve(argc - i, argv + i,
686 prefix, prefix_length);
687 if (has_errors)
688 active_cache_changed = 0;
689 goto finish;
690 }
691 if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
692 setup_work_tree();
693 has_errors = do_reupdate(argc - i, argv + i,
694 prefix, prefix_length);
695 if (has_errors)
696 active_cache_changed = 0;
697 goto finish;
698 }
699 if (!strcmp(path, "--ignore-missing")) {
700 refresh_flags |= REFRESH_IGNORE_MISSING;
701 continue;
702 }
703 if (!strcmp(path, "--verbose")) {
704 verbose = 1;
705 continue;
706 }
707 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
708 usage(update_index_usage);
709 die("unknown option %s", path);
710 }
711 setup_work_tree();
712 p = prefix_path(prefix, prefix_length, path);
713 update_one(p, NULL, 0);
714 if (set_executable_bit)
715 chmod_path(set_executable_bit, p);
716 if (p < path || p > path + strlen(path))
717 free((char*)p);
718 }
719 if (read_from_stdin) {
720 struct strbuf buf, nbuf;
721 strbuf_init(&buf, 0);
723 strbuf_init(&nbuf, 0);
724 setup_work_tree();
725 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
726 const char *p;
727 if (line_termination && buf.buf[0] == '"') {
728 strbuf_reset(&nbuf);
729 if (unquote_c_style(&nbuf, buf.buf, NULL))
730 die("line is badly quoted");
731 strbuf_swap(&buf, &nbuf);
732 }
733 p = prefix_path(prefix, prefix_length, buf.buf);
734 update_one(p, NULL, 0);
735 if (set_executable_bit)
736 chmod_path(set_executable_bit, p);
737 if (p < buf.buf || p > buf.buf + buf.len)
738 free((char *)p);
739 }
740 strbuf_release(&nbuf);
741 strbuf_release(&buf);
742 }
743 finish:
745 if (active_cache_changed) {
746 if (newfd < 0) {
747 if (refresh_flags & REFRESH_QUIET)
748 exit(128);
749 die("unable to create '%s.lock': %s",
750 get_index_file(), strerror(lock_error));
751 }
752 if (write_cache(newfd, active_cache, active_nr) ||
753 commit_locked_index(lock_file))
754 die("Unable to write new index file");
755 }
756 rollback_lock_file(lock_file);
758 return has_errors ? 1 : 0;
760}