1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7#include "strbuf.h"
8#include "quote.h"
9#include "cache-tree.h"
10#include "tree-walk.h"
11#include "builtin.h"
12/*
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 |= htons(CE_VALID);
51 break;
52 case UNMARK_VALID:
53 active_cache[pos]->ce_flags &= ~htons(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 add_file_to_cache(const char *path)
64{
65 int size, namelen, option, status;
66 struct cache_entry *ce;
67 struct stat st;
68 status = lstat(path, &st);
70 /* We probably want to do this in remove_file_from_cache() and
72 * add_cache_entry() instead...
73 */
74 cache_tree_invalidate_path(active_cache_tree, path);
75 if (status < 0 || S_ISDIR(st.st_mode)) {
77 /* When we used to have "path" and now we want to add
78 * "path/file", we need a way to remove "path" before
79 * being able to add "path/file". However,
80 * "git-update-index --remove path" would not work.
81 * --force-remove can be used but this is more user
82 * friendly, especially since we can do the opposite
83 * case just fine without --force-remove.
84 */
85 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
86 if (allow_remove) {
87 if (remove_file_from_cache(path))
88 return error("%s: cannot remove from the index",
89 path);
90 else
91 return 0;
92 } else if (status < 0) {
93 return error("%s: does not exist and --remove not passed",
94 path);
95 }
96 }
97 if (0 == status)
98 return error("%s: is a directory - add files inside instead",
99 path);
100 else
101 return error("lstat(\"%s\"): %s", path,
102 strerror(errno));
103 }
104 namelen = strlen(path);
106 size = cache_entry_size(namelen);
107 ce = xcalloc(1, size);
108 memcpy(ce->name, path, namelen);
109 ce->ce_flags = htons(namelen);
110 fill_stat_cache_info(ce, &st);
111 if (trust_executable_bit && has_symlinks)
113 ce->ce_mode = create_ce_mode(st.st_mode);
114 else {
115 /* If there is an existing entry, pick the mode bits and type
116 * from it, otherwise assume unexecutable regular file.
117 */
118 struct cache_entry *ent;
119 int pos = cache_name_pos(path, namelen);
120 ent = (0 <= pos) ? active_cache[pos] : NULL;
122 ce->ce_mode = ce_mode_from_stat(ent, st.st_mode);
123 }
124 if (index_path(ce->sha1, path, &st, !info_only))
126 return -1;
127 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
128 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
129 if (add_cache_entry(ce, option))
130 return error("%s: cannot add to the index - missing --add option?",
131 path);
132 return 0;
133}
134static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
136 const char *path, int stage)
137{
138 int size, len, option;
139 struct cache_entry *ce;
140 if (!verify_path(path))
142 return -1;
143 len = strlen(path);
145 size = cache_entry_size(len);
146 ce = xcalloc(1, size);
147 hashcpy(ce->sha1, sha1);
149 memcpy(ce->name, path, len);
150 ce->ce_flags = create_ce_flags(len, stage);
151 ce->ce_mode = create_ce_mode(mode);
152 if (assume_unchanged)
153 ce->ce_flags |= htons(CE_VALID);
154 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
155 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
156 if (add_cache_entry(ce, option))
157 return error("%s: cannot add to the index - missing --add option?",
158 path);
159 report("add '%s'", path);
160 cache_tree_invalidate_path(active_cache_tree, path);
161 return 0;
162}
163static void chmod_path(int flip, const char *path)
165{
166 int pos;
167 struct cache_entry *ce;
168 unsigned int mode;
169 pos = cache_name_pos(path, strlen(path));
171 if (pos < 0)
172 goto fail;
173 ce = active_cache[pos];
174 mode = ntohl(ce->ce_mode);
175 if (!S_ISREG(mode))
176 goto fail;
177 switch (flip) {
178 case '+':
179 ce->ce_mode |= htonl(0111); break;
180 case '-':
181 ce->ce_mode &= htonl(~0111); break;
182 default:
183 goto fail;
184 }
185 cache_tree_invalidate_path(active_cache_tree, path);
186 active_cache_changed = 1;
187 report("chmod %cx '%s'", flip, path);
188 return;
189 fail:
190 die("git-update-index: cannot chmod %cx '%s'", flip, path);
191}
192static void update_one(const char *path, const char *prefix, int prefix_length)
194{
195 const char *p = prefix_path(prefix, prefix_length, path);
196 if (!verify_path(p)) {
197 fprintf(stderr, "Ignoring path %s\n", path);
198 goto free_return;
199 }
200 if (mark_valid_only) {
201 if (mark_valid(p))
202 die("Unable to mark file %s", path);
203 goto free_return;
204 }
205 cache_tree_invalidate_path(active_cache_tree, path);
206 if (force_remove) {
208 if (remove_file_from_cache(p))
209 die("git-update-index: unable to remove %s", path);
210 report("remove '%s'", path);
211 goto free_return;
212 }
213 if (add_file_to_cache(p))
214 die("Unable to process file %s", path);
215 report("add '%s'", path);
216 free_return:
217 if (p < path || p > path + strlen(path))
218 free((char*)p);
219}
220static void read_index_info(int line_termination)
222{
223 struct strbuf buf;
224 strbuf_init(&buf);
225 while (1) {
226 char *ptr, *tab;
227 char *path_name;
228 unsigned char sha1[20];
229 unsigned int mode;
230 int stage;
231 /* This reads lines formatted in one of three formats:
233 *
234 * (1) mode SP sha1 TAB path
235 * The first format is what "git-apply --index-info"
236 * reports, and used to reconstruct a partial tree
237 * that is used for phony merge base tree when falling
238 * back on 3-way merge.
239 *
240 * (2) mode SP type SP sha1 TAB path
241 * The second format is to stuff git-ls-tree output
242 * into the index file.
243 *
244 * (3) mode SP sha1 SP stage TAB path
245 * This format is to put higher order stages into the
246 * index file and matches git-ls-files --stage output.
247 */
248 read_line(&buf, stdin, line_termination);
249 if (buf.eof)
250 break;
251 mode = strtoul(buf.buf, &ptr, 8);
253 if (ptr == buf.buf || *ptr != ' ')
254 goto bad_line;
255 tab = strchr(ptr, '\t');
257 if (!tab || tab - ptr < 41)
258 goto bad_line;
259 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
261 stage = tab[-1] - '0';
262 ptr = tab + 1; /* point at the head of path */
263 tab = tab - 2; /* point at tail of sha1 */
264 }
265 else {
266 stage = 0;
267 ptr = tab + 1; /* point at the head of path */
268 }
269 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
271 goto bad_line;
272 if (line_termination && ptr[0] == '"')
274 path_name = unquote_c_style(ptr, NULL);
275 else
276 path_name = ptr;
277 if (!verify_path(path_name)) {
279 fprintf(stderr, "Ignoring path %s\n", path_name);
280 if (path_name != ptr)
281 free(path_name);
282 continue;
283 }
284 cache_tree_invalidate_path(active_cache_tree, path_name);
285 if (!mode) {
287 /* mode == 0 means there is no such path -- remove */
288 if (remove_file_from_cache(path_name))
289 die("git-update-index: unable to remove %s",
290 ptr);
291 }
292 else {
293 /* mode ' ' sha1 '\t' name
294 * ptr[-1] points at tab,
295 * ptr[-41] is at the beginning of sha1
296 */
297 ptr[-42] = ptr[-1] = 0;
298 if (add_cacheinfo(mode, sha1, path_name, stage))
299 die("git-update-index: unable to update %s",
300 path_name);
301 }
302 if (path_name != ptr)
303 free(path_name);
304 continue;
305 bad_line:
307 die("malformed index info %s", buf.buf);
308 }
309}
310static const char update_index_usage[] =
312"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>...";
313static unsigned char head_sha1[20];
315static unsigned char merge_head_sha1[20];
316static struct cache_entry *read_one_ent(const char *which,
318 unsigned char *ent, const char *path,
319 int namelen, int stage)
320{
321 unsigned mode;
322 unsigned char sha1[20];
323 int size;
324 struct cache_entry *ce;
325 if (get_tree_entry(ent, path, sha1, &mode)) {
327 if (which)
328 error("%s: not in %s branch.", path, which);
329 return NULL;
330 }
331 if (mode == S_IFDIR) {
332 if (which)
333 error("%s: not a blob in %s branch.", path, which);
334 return NULL;
335 }
336 size = cache_entry_size(namelen);
337 ce = xcalloc(1, size);
338 hashcpy(ce->sha1, sha1);
340 memcpy(ce->name, path, namelen);
341 ce->ce_flags = create_ce_flags(namelen, stage);
342 ce->ce_mode = create_ce_mode(mode);
343 return ce;
344}
345static int unresolve_one(const char *path)
347{
348 int namelen = strlen(path);
349 int pos;
350 int ret = 0;
351 struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
352 /* See if there is such entry in the index. */
354 pos = cache_name_pos(path, namelen);
355 if (pos < 0) {
356 /* If there isn't, either it is unmerged, or
357 * resolved as "removed" by mistake. We do not
358 * want to do anything in the former case.
359 */
360 pos = -pos-1;
361 if (pos < active_nr) {
362 struct cache_entry *ce = active_cache[pos];
363 if (ce_namelen(ce) == namelen &&
364 !memcmp(ce->name, path, namelen)) {
365 fprintf(stderr,
366 "%s: skipping still unmerged path.\n",
367 path);
368 goto free_return;
369 }
370 }
371 }
372 /* Grab blobs from given path from HEAD and MERGE_HEAD,
374 * stuff HEAD version in stage #2,
375 * stuff MERGE_HEAD version in stage #3.
376 */
377 ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
378 ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
379 if (!ce_2 || !ce_3) {
381 ret = -1;
382 goto free_return;
383 }
384 if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
385 ce_2->ce_mode == ce_3->ce_mode) {
386 fprintf(stderr, "%s: identical in both, skipping.\n",
387 path);
388 goto free_return;
389 }
390 cache_tree_invalidate_path(active_cache_tree, path);
392 remove_file_from_cache(path);
393 if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
394 error("%s: cannot add our version to the index.", path);
395 ret = -1;
396 goto free_return;
397 }
398 if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
399 return 0;
400 error("%s: cannot add their version to the index.", path);
401 ret = -1;
402 free_return:
403 free(ce_2);
404 free(ce_3);
405 return ret;
406}
407static void read_head_pointers(void)
409{
410 if (read_ref("HEAD", head_sha1))
411 die("No HEAD -- no initial commit yet?\n");
412 if (read_ref("MERGE_HEAD", merge_head_sha1)) {
413 fprintf(stderr, "Not in the middle of a merge.\n");
414 exit(0);
415 }
416}
417static int do_unresolve(int ac, const char **av,
419 const char *prefix, int prefix_length)
420{
421 int i;
422 int err = 0;
423 /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
425 * are not doing a merge, so exit with success status.
426 */
427 read_head_pointers();
428 for (i = 1; i < ac; i++) {
430 const char *arg = av[i];
431 const char *p = prefix_path(prefix, prefix_length, arg);
432 err |= unresolve_one(p);
433 if (p < arg || p > arg + strlen(arg))
434 free((char*)p);
435 }
436 return err;
437}
438static int do_reupdate(int ac, const char **av,
440 const char *prefix, int prefix_length)
441{
442 /* Read HEAD and run update-index on paths that are
443 * merged and already different between index and HEAD.
444 */
445 int pos;
446 int has_head = 1;
447 const char **pathspec = get_pathspec(prefix, av + 1);
448 if (read_ref("HEAD", head_sha1))
450 /* If there is no HEAD, that means it is an initial
451 * commit. Update everything in the index.
452 */
453 has_head = 0;
454 redo:
455 for (pos = 0; pos < active_nr; pos++) {
456 struct cache_entry *ce = active_cache[pos];
457 struct cache_entry *old = NULL;
458 int save_nr;
459 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
461 continue;
462 if (has_head)
463 old = read_one_ent(NULL, head_sha1,
464 ce->name, ce_namelen(ce), 0);
465 if (old && ce->ce_mode == old->ce_mode &&
466 !hashcmp(ce->sha1, old->sha1)) {
467 free(old);
468 continue; /* unchanged */
469 }
470 /* Be careful. The working tree may not have the
471 * path anymore, in which case, under 'allow_remove',
472 * or worse yet 'allow_replace', active_nr may decrease.
473 */
474 save_nr = active_nr;
475 update_one(ce->name + prefix_length, prefix, prefix_length);
476 if (save_nr != active_nr)
477 goto redo;
478 }
479 return 0;
480}
481int cmd_update_index(int argc, const char **argv, const char *prefix)
483{
484 int i, newfd, entries, has_errors = 0, line_termination = '\n';
485 int allow_options = 1;
486 int read_from_stdin = 0;
487 int prefix_length = prefix ? strlen(prefix) : 0;
488 char set_executable_bit = 0;
489 unsigned int refresh_flags = 0;
490 int lock_error = 0;
491 struct lock_file *lock_file;
492 git_config(git_default_config);
494 /* We can't free this memory, it becomes part of a linked list parsed atexit() */
496 lock_file = xcalloc(1, sizeof(struct lock_file));
497 newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
499 if (newfd < 0)
500 lock_error = errno;
501 entries = read_cache();
503 if (entries < 0)
504 die("cache corrupted");
505 for (i = 1 ; i < argc; i++) {
507 const char *path = argv[i];
508 const char *p;
509 if (allow_options && *path == '-') {
511 if (!strcmp(path, "--")) {
512 allow_options = 0;
513 continue;
514 }
515 if (!strcmp(path, "-q")) {
516 refresh_flags |= REFRESH_QUIET;
517 continue;
518 }
519 if (!strcmp(path, "--add")) {
520 allow_add = 1;
521 continue;
522 }
523 if (!strcmp(path, "--replace")) {
524 allow_replace = 1;
525 continue;
526 }
527 if (!strcmp(path, "--remove")) {
528 allow_remove = 1;
529 continue;
530 }
531 if (!strcmp(path, "--unmerged")) {
532 refresh_flags |= REFRESH_UNMERGED;
533 continue;
534 }
535 if (!strcmp(path, "--refresh")) {
536 has_errors |= refresh_cache(refresh_flags);
537 continue;
538 }
539 if (!strcmp(path, "--really-refresh")) {
540 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
541 continue;
542 }
543 if (!strcmp(path, "--cacheinfo")) {
544 unsigned char sha1[20];
545 unsigned int mode;
546 if (i+3 >= argc)
548 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
549 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
551 get_sha1_hex(argv[i+2], sha1) ||
552 add_cacheinfo(mode, sha1, argv[i+3], 0))
553 die("git-update-index: --cacheinfo"
554 " cannot add %s", argv[i+3]);
555 i += 3;
556 continue;
557 }
558 if (!strcmp(path, "--chmod=-x") ||
559 !strcmp(path, "--chmod=+x")) {
560 if (argc <= i+1)
561 die("git-update-index: %s <path>", path);
562 set_executable_bit = path[8];
563 continue;
564 }
565 if (!strcmp(path, "--assume-unchanged")) {
566 mark_valid_only = MARK_VALID;
567 continue;
568 }
569 if (!strcmp(path, "--no-assume-unchanged")) {
570 mark_valid_only = UNMARK_VALID;
571 continue;
572 }
573 if (!strcmp(path, "--info-only")) {
574 info_only = 1;
575 continue;
576 }
577 if (!strcmp(path, "--force-remove")) {
578 force_remove = 1;
579 continue;
580 }
581 if (!strcmp(path, "-z")) {
582 line_termination = 0;
583 continue;
584 }
585 if (!strcmp(path, "--stdin")) {
586 if (i != argc - 1)
587 die("--stdin must be at the end");
588 read_from_stdin = 1;
589 break;
590 }
591 if (!strcmp(path, "--index-info")) {
592 if (i != argc - 1)
593 die("--index-info must be at the end");
594 allow_add = allow_replace = allow_remove = 1;
595 read_index_info(line_termination);
596 break;
597 }
598 if (!strcmp(path, "--unresolve")) {
599 has_errors = do_unresolve(argc - i, argv + i,
600 prefix, prefix_length);
601 if (has_errors)
602 active_cache_changed = 0;
603 goto finish;
604 }
605 if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
606 has_errors = do_reupdate(argc - i, argv + i,
607 prefix, prefix_length);
608 if (has_errors)
609 active_cache_changed = 0;
610 goto finish;
611 }
612 if (!strcmp(path, "--ignore-missing")) {
613 refresh_flags |= REFRESH_IGNORE_MISSING;
614 continue;
615 }
616 if (!strcmp(path, "--verbose")) {
617 verbose = 1;
618 continue;
619 }
620 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
621 usage(update_index_usage);
622 die("unknown option %s", path);
623 }
624 p = prefix_path(prefix, prefix_length, path);
625 update_one(p, NULL, 0);
626 if (set_executable_bit)
627 chmod_path(set_executable_bit, p);
628 if (p < path || p > path + strlen(path))
629 free((char*)p);
630 }
631 if (read_from_stdin) {
632 struct strbuf buf;
633 strbuf_init(&buf);
634 while (1) {
635 char *path_name;
636 const char *p;
637 read_line(&buf, stdin, line_termination);
638 if (buf.eof)
639 break;
640 if (line_termination && buf.buf[0] == '"')
641 path_name = unquote_c_style(buf.buf, NULL);
642 else
643 path_name = buf.buf;
644 p = prefix_path(prefix, prefix_length, path_name);
645 update_one(p, NULL, 0);
646 if (set_executable_bit)
647 chmod_path(set_executable_bit, p);
648 if (p < path_name || p > path_name + strlen(path_name))
649 free((char*) p);
650 if (path_name != buf.buf)
651 free(path_name);
652 }
653 }
654 finish:
656 if (active_cache_changed) {
657 if (newfd < 0) {
658 if (refresh_flags & REFRESH_QUIET)
659 exit(128);
660 die("unable to create '%s.lock': %s",
661 get_index_file(), strerror(lock_error));
662 }
663 if (write_cache(newfd, active_cache, active_nr) ||
664 close(newfd) || commit_lock_file(lock_file))
665 die("Unable to write new index file");
666 }
667 rollback_lock_file(lock_file);
669 return has_errors ? 1 : 0;
671}