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 ce->ce_mode = create_ce_mode(st.st_mode);
113 if (!trust_executable_bit) {
114 /* If there is an existing entry, pick the mode bits
115 * from it, otherwise assume unexecutable.
116 */
117 int pos = cache_name_pos(path, namelen);
118 if (0 <= pos)
119 ce->ce_mode = active_cache[pos]->ce_mode;
120 else if (S_ISREG(st.st_mode))
121 ce->ce_mode = create_ce_mode(S_IFREG | 0666);
122 }
123 if (index_path(ce->sha1, path, &st, !info_only))
125 return -1;
126 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
127 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
128 if (add_cache_entry(ce, option))
129 return error("%s: cannot add to the index - missing --add option?",
130 path);
131 return 0;
132}
133static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
135 const char *path, int stage)
136{
137 int size, len, option;
138 struct cache_entry *ce;
139 if (!verify_path(path))
141 return -1;
142 len = strlen(path);
144 size = cache_entry_size(len);
145 ce = xcalloc(1, size);
146 hashcpy(ce->sha1, sha1);
148 memcpy(ce->name, path, len);
149 ce->ce_flags = create_ce_flags(len, stage);
150 ce->ce_mode = create_ce_mode(mode);
151 if (assume_unchanged)
152 ce->ce_flags |= htons(CE_VALID);
153 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
154 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
155 if (add_cache_entry(ce, option))
156 return error("%s: cannot add to the index - missing --add option?",
157 path);
158 report("add '%s'", path);
159 cache_tree_invalidate_path(active_cache_tree, path);
160 return 0;
161}
162static void chmod_path(int flip, const char *path)
164{
165 int pos;
166 struct cache_entry *ce;
167 unsigned int mode;
168 pos = cache_name_pos(path, strlen(path));
170 if (pos < 0)
171 goto fail;
172 ce = active_cache[pos];
173 mode = ntohl(ce->ce_mode);
174 if (!S_ISREG(mode))
175 goto fail;
176 switch (flip) {
177 case '+':
178 ce->ce_mode |= htonl(0111); break;
179 case '-':
180 ce->ce_mode &= htonl(~0111); break;
181 default:
182 goto fail;
183 }
184 cache_tree_invalidate_path(active_cache_tree, path);
185 active_cache_changed = 1;
186 report("chmod %cx '%s'", flip, path);
187 return;
188 fail:
189 die("git-update-index: cannot chmod %cx '%s'", flip, path);
190}
191static void update_one(const char *path, const char *prefix, int prefix_length)
193{
194 const char *p = prefix_path(prefix, prefix_length, path);
195 if (!verify_path(p)) {
196 fprintf(stderr, "Ignoring path %s\n", path);
197 goto free_return;
198 }
199 if (mark_valid_only) {
200 if (mark_valid(p))
201 die("Unable to mark file %s", path);
202 goto free_return;
203 }
204 cache_tree_invalidate_path(active_cache_tree, path);
205 if (force_remove) {
207 if (remove_file_from_cache(p))
208 die("git-update-index: unable to remove %s", path);
209 report("remove '%s'", path);
210 goto free_return;
211 }
212 if (add_file_to_cache(p))
213 die("Unable to process file %s", path);
214 report("add '%s'", path);
215 free_return:
216 if (p < path || p > path + strlen(path))
217 free((char*)p);
218}
219static void read_index_info(int line_termination)
221{
222 struct strbuf buf;
223 strbuf_init(&buf);
224 while (1) {
225 char *ptr, *tab;
226 char *path_name;
227 unsigned char sha1[20];
228 unsigned int mode;
229 int stage;
230 /* This reads lines formatted in one of three formats:
232 *
233 * (1) mode SP sha1 TAB path
234 * The first format is what "git-apply --index-info"
235 * reports, and used to reconstruct a partial tree
236 * that is used for phony merge base tree when falling
237 * back on 3-way merge.
238 *
239 * (2) mode SP type SP sha1 TAB path
240 * The second format is to stuff git-ls-tree output
241 * into the index file.
242 *
243 * (3) mode SP sha1 SP stage TAB path
244 * This format is to put higher order stages into the
245 * index file and matches git-ls-files --stage output.
246 */
247 read_line(&buf, stdin, line_termination);
248 if (buf.eof)
249 break;
250 mode = strtoul(buf.buf, &ptr, 8);
252 if (ptr == buf.buf || *ptr != ' ')
253 goto bad_line;
254 tab = strchr(ptr, '\t');
256 if (!tab || tab - ptr < 41)
257 goto bad_line;
258 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
260 stage = tab[-1] - '0';
261 ptr = tab + 1; /* point at the head of path */
262 tab = tab - 2; /* point at tail of sha1 */
263 }
264 else {
265 stage = 0;
266 ptr = tab + 1; /* point at the head of path */
267 }
268 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
270 goto bad_line;
271 if (line_termination && ptr[0] == '"')
273 path_name = unquote_c_style(ptr, NULL);
274 else
275 path_name = ptr;
276 if (!verify_path(path_name)) {
278 fprintf(stderr, "Ignoring path %s\n", path_name);
279 if (path_name != ptr)
280 free(path_name);
281 continue;
282 }
283 cache_tree_invalidate_path(active_cache_tree, path_name);
284 if (!mode) {
286 /* mode == 0 means there is no such path -- remove */
287 if (remove_file_from_cache(path_name))
288 die("git-update-index: unable to remove %s",
289 ptr);
290 }
291 else {
292 /* mode ' ' sha1 '\t' name
293 * ptr[-1] points at tab,
294 * ptr[-41] is at the beginning of sha1
295 */
296 ptr[-42] = ptr[-1] = 0;
297 if (add_cacheinfo(mode, sha1, path_name, stage))
298 die("git-update-index: unable to update %s",
299 path_name);
300 }
301 if (path_name != ptr)
302 free(path_name);
303 continue;
304 bad_line:
306 die("malformed index info %s", buf.buf);
307 }
308}
309static const char update_index_usage[] =
311"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>...";
312static unsigned char head_sha1[20];
314static unsigned char merge_head_sha1[20];
315static struct cache_entry *read_one_ent(const char *which,
317 unsigned char *ent, const char *path,
318 int namelen, int stage)
319{
320 unsigned mode;
321 unsigned char sha1[20];
322 int size;
323 struct cache_entry *ce;
324 if (get_tree_entry(ent, path, sha1, &mode)) {
326 if (which)
327 error("%s: not in %s branch.", path, which);
328 return NULL;
329 }
330 if (mode == S_IFDIR) {
331 if (which)
332 error("%s: not a blob in %s branch.", path, which);
333 return NULL;
334 }
335 size = cache_entry_size(namelen);
336 ce = xcalloc(1, size);
337 hashcpy(ce->sha1, sha1);
339 memcpy(ce->name, path, namelen);
340 ce->ce_flags = create_ce_flags(namelen, stage);
341 ce->ce_mode = create_ce_mode(mode);
342 return ce;
343}
344static int unresolve_one(const char *path)
346{
347 int namelen = strlen(path);
348 int pos;
349 int ret = 0;
350 struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
351 /* See if there is such entry in the index. */
353 pos = cache_name_pos(path, namelen);
354 if (pos < 0) {
355 /* If there isn't, either it is unmerged, or
356 * resolved as "removed" by mistake. We do not
357 * want to do anything in the former case.
358 */
359 pos = -pos-1;
360 if (pos < active_nr) {
361 struct cache_entry *ce = active_cache[pos];
362 if (ce_namelen(ce) == namelen &&
363 !memcmp(ce->name, path, namelen)) {
364 fprintf(stderr,
365 "%s: skipping still unmerged path.\n",
366 path);
367 goto free_return;
368 }
369 }
370 }
371 /* Grab blobs from given path from HEAD and MERGE_HEAD,
373 * stuff HEAD version in stage #2,
374 * stuff MERGE_HEAD version in stage #3.
375 */
376 ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
377 ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
378 if (!ce_2 || !ce_3) {
380 ret = -1;
381 goto free_return;
382 }
383 if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
384 ce_2->ce_mode == ce_3->ce_mode) {
385 fprintf(stderr, "%s: identical in both, skipping.\n",
386 path);
387 goto free_return;
388 }
389 cache_tree_invalidate_path(active_cache_tree, path);
391 remove_file_from_cache(path);
392 if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
393 error("%s: cannot add our version to the index.", path);
394 ret = -1;
395 goto free_return;
396 }
397 if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
398 return 0;
399 error("%s: cannot add their version to the index.", path);
400 ret = -1;
401 free_return:
402 free(ce_2);
403 free(ce_3);
404 return ret;
405}
406static void read_head_pointers(void)
408{
409 if (read_ref("HEAD", head_sha1))
410 die("No HEAD -- no initial commit yet?\n");
411 if (read_ref("MERGE_HEAD", merge_head_sha1)) {
412 fprintf(stderr, "Not in the middle of a merge.\n");
413 exit(0);
414 }
415}
416static int do_unresolve(int ac, const char **av,
418 const char *prefix, int prefix_length)
419{
420 int i;
421 int err = 0;
422 /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
424 * are not doing a merge, so exit with success status.
425 */
426 read_head_pointers();
427 for (i = 1; i < ac; i++) {
429 const char *arg = av[i];
430 const char *p = prefix_path(prefix, prefix_length, arg);
431 err |= unresolve_one(p);
432 if (p < arg || p > arg + strlen(arg))
433 free((char*)p);
434 }
435 return err;
436}
437static int do_reupdate(int ac, const char **av,
439 const char *prefix, int prefix_length)
440{
441 /* Read HEAD and run update-index on paths that are
442 * merged and already different between index and HEAD.
443 */
444 int pos;
445 int has_head = 1;
446 const char **pathspec = get_pathspec(prefix, av + 1);
447 if (read_ref("HEAD", head_sha1))
449 /* If there is no HEAD, that means it is an initial
450 * commit. Update everything in the index.
451 */
452 has_head = 0;
453 redo:
454 for (pos = 0; pos < active_nr; pos++) {
455 struct cache_entry *ce = active_cache[pos];
456 struct cache_entry *old = NULL;
457 int save_nr;
458 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
460 continue;
461 if (has_head)
462 old = read_one_ent(NULL, head_sha1,
463 ce->name, ce_namelen(ce), 0);
464 if (old && ce->ce_mode == old->ce_mode &&
465 !hashcmp(ce->sha1, old->sha1)) {
466 free(old);
467 continue; /* unchanged */
468 }
469 /* Be careful. The working tree may not have the
470 * path anymore, in which case, under 'allow_remove',
471 * or worse yet 'allow_replace', active_nr may decrease.
472 */
473 save_nr = active_nr;
474 update_one(ce->name + prefix_length, prefix, prefix_length);
475 if (save_nr != active_nr)
476 goto redo;
477 }
478 return 0;
479}
480int cmd_update_index(int argc, const char **argv, const char *prefix)
482{
483 int i, newfd, entries, has_errors = 0, line_termination = '\n';
484 int allow_options = 1;
485 int read_from_stdin = 0;
486 int prefix_length = prefix ? strlen(prefix) : 0;
487 char set_executable_bit = 0;
488 unsigned int refresh_flags = 0;
489 struct lock_file *lock_file;
490 git_config(git_default_config);
492 /* We can't free this memory, it becomes part of a linked list parsed atexit() */
494 lock_file = xcalloc(1, sizeof(struct lock_file));
495 newfd = hold_lock_file_for_update(lock_file, get_index_file(), 1);
497 entries = read_cache();
499 if (entries < 0)
500 die("cache corrupted");
501 for (i = 1 ; i < argc; i++) {
503 const char *path = argv[i];
504 const char *p;
505 if (allow_options && *path == '-') {
507 if (!strcmp(path, "--")) {
508 allow_options = 0;
509 continue;
510 }
511 if (!strcmp(path, "-q")) {
512 refresh_flags |= REFRESH_QUIET;
513 continue;
514 }
515 if (!strcmp(path, "--add")) {
516 allow_add = 1;
517 continue;
518 }
519 if (!strcmp(path, "--replace")) {
520 allow_replace = 1;
521 continue;
522 }
523 if (!strcmp(path, "--remove")) {
524 allow_remove = 1;
525 continue;
526 }
527 if (!strcmp(path, "--unmerged")) {
528 refresh_flags |= REFRESH_UNMERGED;
529 continue;
530 }
531 if (!strcmp(path, "--refresh")) {
532 has_errors |= refresh_cache(refresh_flags);
533 continue;
534 }
535 if (!strcmp(path, "--really-refresh")) {
536 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
537 continue;
538 }
539 if (!strcmp(path, "--cacheinfo")) {
540 unsigned char sha1[20];
541 unsigned int mode;
542 if (i+3 >= argc)
544 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
545 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
547 get_sha1_hex(argv[i+2], sha1) ||
548 add_cacheinfo(mode, sha1, argv[i+3], 0))
549 die("git-update-index: --cacheinfo"
550 " cannot add %s", argv[i+3]);
551 i += 3;
552 continue;
553 }
554 if (!strcmp(path, "--chmod=-x") ||
555 !strcmp(path, "--chmod=+x")) {
556 if (argc <= i+1)
557 die("git-update-index: %s <path>", path);
558 set_executable_bit = path[8];
559 continue;
560 }
561 if (!strcmp(path, "--assume-unchanged")) {
562 mark_valid_only = MARK_VALID;
563 continue;
564 }
565 if (!strcmp(path, "--no-assume-unchanged")) {
566 mark_valid_only = UNMARK_VALID;
567 continue;
568 }
569 if (!strcmp(path, "--info-only")) {
570 info_only = 1;
571 continue;
572 }
573 if (!strcmp(path, "--force-remove")) {
574 force_remove = 1;
575 continue;
576 }
577 if (!strcmp(path, "-z")) {
578 line_termination = 0;
579 continue;
580 }
581 if (!strcmp(path, "--stdin")) {
582 if (i != argc - 1)
583 die("--stdin must be at the end");
584 read_from_stdin = 1;
585 break;
586 }
587 if (!strcmp(path, "--index-info")) {
588 if (i != argc - 1)
589 die("--index-info must be at the end");
590 allow_add = allow_replace = allow_remove = 1;
591 read_index_info(line_termination);
592 break;
593 }
594 if (!strcmp(path, "--unresolve")) {
595 has_errors = do_unresolve(argc - i, argv + i,
596 prefix, prefix_length);
597 if (has_errors)
598 active_cache_changed = 0;
599 goto finish;
600 }
601 if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
602 has_errors = do_reupdate(argc - i, argv + i,
603 prefix, prefix_length);
604 if (has_errors)
605 active_cache_changed = 0;
606 goto finish;
607 }
608 if (!strcmp(path, "--ignore-missing")) {
609 refresh_flags |= REFRESH_IGNORE_MISSING;
610 continue;
611 }
612 if (!strcmp(path, "--verbose")) {
613 verbose = 1;
614 continue;
615 }
616 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
617 usage(update_index_usage);
618 die("unknown option %s", path);
619 }
620 p = prefix_path(prefix, prefix_length, path);
621 update_one(p, NULL, 0);
622 if (set_executable_bit)
623 chmod_path(set_executable_bit, p);
624 if (p < path || p > path + strlen(path))
625 free((char*)p);
626 }
627 if (read_from_stdin) {
628 struct strbuf buf;
629 strbuf_init(&buf);
630 while (1) {
631 char *path_name;
632 const char *p;
633 read_line(&buf, stdin, line_termination);
634 if (buf.eof)
635 break;
636 if (line_termination && buf.buf[0] == '"')
637 path_name = unquote_c_style(buf.buf, NULL);
638 else
639 path_name = buf.buf;
640 p = prefix_path(prefix, prefix_length, path_name);
641 update_one(p, NULL, 0);
642 if (set_executable_bit)
643 chmod_path(set_executable_bit, p);
644 if (p < path_name || p > path_name + strlen(path_name))
645 free((char*) p);
646 if (path_name != buf.buf)
647 free(path_name);
648 }
649 }
650 finish:
652 if (active_cache_changed) {
653 if (write_cache(newfd, active_cache, active_nr) ||
654 close(newfd) || commit_lock_file(lock_file))
655 die("Unable to write new index file");
656 }
657 rollback_lock_file(lock_file);
659 return has_errors ? 1 : 0;
661}