86f53948fceaa93fb928323e6fba737510cec86a
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.h"
10#include "cache-tree.h"
11static unsigned char active_cache_sha1[20];
13static struct cache_tree *active_cache_tree;
14/*
16 * Default to not allowing changes to the list of files. The
17 * tool doesn't actually care, but this makes it harder to add
18 * files to the revision control by mistake by doing something
19 * like "git-update-index *" and suddenly having all the object
20 * files be revision controlled.
21 */
22static int allow_add;
23static int allow_remove;
24static int allow_replace;
25static int allow_unmerged; /* --refresh needing merge is not error */
26static int not_new; /* --refresh not having working tree files is not error */
27static int quiet; /* --refresh needing update is not error */
28static int info_only;
29static int force_remove;
30static int verbose;
31static int mark_valid_only = 0;
32#define MARK_VALID 1
33#define UNMARK_VALID 2
34/* Three functions to allow overloaded pointer return; see linux/err.h */
37static inline void *ERR_PTR(long error)
38{
39 return (void *) error;
40}
41static inline long PTR_ERR(const void *ptr)
43{
44 return (long) ptr;
45}
46static inline long IS_ERR(const void *ptr)
48{
49 return (unsigned long)ptr > (unsigned long)-1000L;
50}
51static void report(const char *fmt, ...)
53{
54 va_list vp;
55 if (!verbose)
57 return;
58 va_start(vp, fmt);
60 vprintf(fmt, vp);
61 putchar('\n');
62 va_end(vp);
63}
64static int mark_valid(const char *path)
66{
67 int namelen = strlen(path);
68 int pos = cache_name_pos(path, namelen);
69 if (0 <= pos) {
70 switch (mark_valid_only) {
71 case MARK_VALID:
72 active_cache[pos]->ce_flags |= htons(CE_VALID);
73 break;
74 case UNMARK_VALID:
75 active_cache[pos]->ce_flags &= ~htons(CE_VALID);
76 break;
77 }
78 cache_tree_invalidate_path(active_cache_tree, path);
79 active_cache_changed = 1;
80 return 0;
81 }
82 return -1;
83}
84static int add_file_to_cache(const char *path)
86{
87 int size, namelen, option, status;
88 struct cache_entry *ce;
89 struct stat st;
90 status = lstat(path, &st);
92 /* We probably want to do this in remove_file_from_cache() and
94 * add_cache_entry() instead...
95 */
96 cache_tree_invalidate_path(active_cache_tree, path);
97 if (status < 0 || S_ISDIR(st.st_mode)) {
99 /* When we used to have "path" and now we want to add
100 * "path/file", we need a way to remove "path" before
101 * being able to add "path/file". However,
102 * "git-update-index --remove path" would not work.
103 * --force-remove can be used but this is more user
104 * friendly, especially since we can do the opposite
105 * case just fine without --force-remove.
106 */
107 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
108 if (allow_remove) {
109 if (remove_file_from_cache(path))
110 return error("%s: cannot remove from the index",
111 path);
112 else
113 return 0;
114 } else if (status < 0) {
115 return error("%s: does not exist and --remove not passed",
116 path);
117 }
118 }
119 if (0 == status)
120 return error("%s: is a directory - add files inside instead",
121 path);
122 else
123 return error("lstat(\"%s\"): %s", path,
124 strerror(errno));
125 }
126 namelen = strlen(path);
128 size = cache_entry_size(namelen);
129 ce = xcalloc(1, size);
130 memcpy(ce->name, path, namelen);
131 ce->ce_flags = htons(namelen);
132 fill_stat_cache_info(ce, &st);
133 ce->ce_mode = create_ce_mode(st.st_mode);
135 if (!trust_executable_bit) {
136 /* If there is an existing entry, pick the mode bits
137 * from it.
138 */
139 int pos = cache_name_pos(path, namelen);
140 if (0 <= pos)
141 ce->ce_mode = active_cache[pos]->ce_mode;
142 }
143 if (index_path(ce->sha1, path, &st, !info_only))
145 return -1;
146 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
147 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
148 if (add_cache_entry(ce, option))
149 return error("%s: cannot add to the index - missing --add option?",
150 path);
151 return 0;
152}
153/*
155 * "refresh" does not calculate a new sha1 file or bring the
156 * cache up-to-date for mode/content changes. But what it
157 * _does_ do is to "re-match" the stat information of a file
158 * with the cache, so that you can refresh the cache for a
159 * file that hasn't been changed but where the stat entry is
160 * out of date.
161 *
162 * For example, you'd want to do this after doing a "git-read-tree",
163 * to link up the stat cache details with the proper files.
164 */
165static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
166{
167 struct stat st;
168 struct cache_entry *updated;
169 int changed, size;
170 if (lstat(ce->name, &st) < 0)
172 return ERR_PTR(-errno);
173 changed = ce_match_stat(ce, &st, really);
175 if (!changed) {
176 if (really && assume_unchanged &&
177 !(ce->ce_flags & htons(CE_VALID)))
178 ; /* mark this one VALID again */
179 else
180 return NULL;
181 }
182 if (ce_modified(ce, &st, really))
184 return ERR_PTR(-EINVAL);
185 size = ce_size(ce);
187 updated = xmalloc(size);
188 memcpy(updated, ce, size);
189 fill_stat_cache_info(updated, &st);
190 /* In this case, if really is not set, we should leave
192 * CE_VALID bit alone. Otherwise, paths marked with
193 * --no-assume-unchanged (i.e. things to be edited) will
194 * reacquire CE_VALID bit automatically, which is not
195 * really what we want.
196 */
197 if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
198 updated->ce_flags &= ~htons(CE_VALID);
199 return updated;
201}
202static int refresh_cache(int really)
204{
205 int i;
206 int has_errors = 0;
207 for (i = 0; i < active_nr; i++) {
209 struct cache_entry *ce, *new;
210 ce = active_cache[i];
211 if (ce_stage(ce)) {
212 while ((i < active_nr) &&
213 ! strcmp(active_cache[i]->name, ce->name))
214 i++;
215 i--;
216 if (allow_unmerged)
217 continue;
218 printf("%s: needs merge\n", ce->name);
219 has_errors = 1;
220 continue;
221 }
222 new = refresh_entry(ce, really);
224 if (!new)
225 continue;
226 if (IS_ERR(new)) {
227 if (not_new && PTR_ERR(new) == -ENOENT)
228 continue;
229 if (really && PTR_ERR(new) == -EINVAL) {
230 /* If we are doing --really-refresh that
231 * means the index is not valid anymore.
232 */
233 ce->ce_flags &= ~htons(CE_VALID);
234 active_cache_changed = 1;
235 }
236 if (quiet)
237 continue;
238 printf("%s: needs update\n", ce->name);
239 has_errors = 1;
240 continue;
241 }
242 active_cache_changed = 1;
243 /* You can NOT just free active_cache[i] here, since it
244 * might not be necessarily malloc()ed but can also come
245 * from mmap(). */
246 active_cache[i] = new;
247 }
248 return has_errors;
249}
250/*
252 * We fundamentally don't like some paths: we don't want
253 * dot or dot-dot anywhere, and for obvious reasons don't
254 * want to recurse into ".git" either.
255 *
256 * Also, we don't want double slashes or slashes at the
257 * end that can make pathnames ambiguous.
258 */
259static int verify_dotfile(const char *rest)
260{
261 /*
262 * The first character was '.', but that
263 * has already been discarded, we now test
264 * the rest.
265 */
266 switch (*rest) {
267 /* "." is not allowed */
268 case '\0': case '/':
269 return 0;
270 /*
272 * ".git" followed by NUL or slash is bad. This
273 * shares the path end test with the ".." case.
274 */
275 case 'g':
276 if (rest[1] != 'i')
277 break;
278 if (rest[2] != 't')
279 break;
280 rest += 2;
281 /* fallthrough */
282 case '.':
283 if (rest[1] == '\0' || rest[1] == '/')
284 return 0;
285 }
286 return 1;
287}
288static int verify_path(const char *path)
290{
291 char c;
292 goto inside;
294 for (;;) {
295 if (!c)
296 return 1;
297 if (c == '/') {
298inside:
299 c = *path++;
300 switch (c) {
301 default:
302 continue;
303 case '/': case '\0':
304 break;
305 case '.':
306 if (verify_dotfile(path))
307 continue;
308 }
309 return 0;
310 }
311 c = *path++;
312 }
313}
314static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
316 const char *path, int stage)
317{
318 int size, len, option;
319 struct cache_entry *ce;
320 if (!verify_path(path))
322 return -1;
323 len = strlen(path);
325 size = cache_entry_size(len);
326 ce = xcalloc(1, size);
327 memcpy(ce->sha1, sha1, 20);
329 memcpy(ce->name, path, len);
330 ce->ce_flags = create_ce_flags(len, stage);
331 ce->ce_mode = create_ce_mode(mode);
332 if (assume_unchanged)
333 ce->ce_flags |= htons(CE_VALID);
334 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
335 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
336 if (add_cache_entry(ce, option))
337 return error("%s: cannot add to the index - missing --add option?",
338 path);
339 report("add '%s'", path);
340 cache_tree_invalidate_path(active_cache_tree, path);
341 return 0;
342}
343static int chmod_path(int flip, const char *path)
345{
346 int pos;
347 struct cache_entry *ce;
348 unsigned int mode;
349 pos = cache_name_pos(path, strlen(path));
351 if (pos < 0)
352 return -1;
353 ce = active_cache[pos];
354 mode = ntohl(ce->ce_mode);
355 if (!S_ISREG(mode))
356 return -1;
357 switch (flip) {
358 case '+':
359 ce->ce_mode |= htonl(0111); break;
360 case '-':
361 ce->ce_mode &= htonl(~0111); break;
362 default:
363 return -1;
364 }
365 cache_tree_invalidate_path(active_cache_tree, path);
366 active_cache_changed = 1;
367 return 0;
368}
369static struct cache_file cache_file;
371static void update_one(const char *path, const char *prefix, int prefix_length)
373{
374 const char *p = prefix_path(prefix, prefix_length, path);
375 if (!verify_path(p)) {
376 fprintf(stderr, "Ignoring path %s\n", path);
377 return;
378 }
379 if (mark_valid_only) {
380 if (mark_valid(p))
381 die("Unable to mark file %s", path);
382 return;
383 }
384 cache_tree_invalidate_path(active_cache_tree, path);
385 if (force_remove) {
387 if (remove_file_from_cache(p))
388 die("git-update-index: unable to remove %s", path);
389 report("remove '%s'", path);
390 return;
391 }
392 if (add_file_to_cache(p))
393 die("Unable to process file %s", path);
394 report("add '%s'", path);
395}
396static void read_index_info(int line_termination)
398{
399 struct strbuf buf;
400 strbuf_init(&buf);
401 while (1) {
402 char *ptr, *tab;
403 char *path_name;
404 unsigned char sha1[20];
405 unsigned int mode;
406 int stage;
407 /* This reads lines formatted in one of three formats:
409 *
410 * (1) mode SP sha1 TAB path
411 * The first format is what "git-apply --index-info"
412 * reports, and used to reconstruct a partial tree
413 * that is used for phony merge base tree when falling
414 * back on 3-way merge.
415 *
416 * (2) mode SP type SP sha1 TAB path
417 * The second format is to stuff git-ls-tree output
418 * into the index file.
419 *
420 * (3) mode SP sha1 SP stage TAB path
421 * This format is to put higher order stages into the
422 * index file and matches git-ls-files --stage output.
423 */
424 read_line(&buf, stdin, line_termination);
425 if (buf.eof)
426 break;
427 mode = strtoul(buf.buf, &ptr, 8);
429 if (ptr == buf.buf || *ptr != ' ')
430 goto bad_line;
431 tab = strchr(ptr, '\t');
433 if (!tab || tab - ptr < 41)
434 goto bad_line;
435 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
437 stage = tab[-1] - '0';
438 ptr = tab + 1; /* point at the head of path */
439 tab = tab - 2; /* point at tail of sha1 */
440 }
441 else {
442 stage = 0;
443 ptr = tab + 1; /* point at the head of path */
444 }
445 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
447 goto bad_line;
448 if (line_termination && ptr[0] == '"')
450 path_name = unquote_c_style(ptr, NULL);
451 else
452 path_name = ptr;
453 if (!verify_path(path_name)) {
455 fprintf(stderr, "Ignoring path %s\n", path_name);
456 if (path_name != ptr)
457 free(path_name);
458 continue;
459 }
460 cache_tree_invalidate_path(active_cache_tree, path_name);
461 if (!mode) {
463 /* mode == 0 means there is no such path -- remove */
464 if (remove_file_from_cache(path_name))
465 die("git-update-index: unable to remove %s",
466 ptr);
467 }
468 else {
469 /* mode ' ' sha1 '\t' name
470 * ptr[-1] points at tab,
471 * ptr[-41] is at the beginning of sha1
472 */
473 ptr[-42] = ptr[-1] = 0;
474 if (add_cacheinfo(mode, sha1, path_name, stage))
475 die("git-update-index: unable to update %s",
476 path_name);
477 }
478 if (path_name != ptr)
479 free(path_name);
480 continue;
481 bad_line:
483 die("malformed index info %s", buf.buf);
484 }
485}
486static const char update_index_usage[] =
488"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
489int main(int argc, const char **argv)
491{
492 int i, newfd, entries, has_errors = 0, line_termination = '\n';
493 int allow_options = 1;
494 int read_from_stdin = 0;
495 const char *prefix = setup_git_directory();
496 int prefix_length = prefix ? strlen(prefix) : 0;
497 git_config(git_default_config);
499 newfd = hold_index_file_for_update(&cache_file, get_index_file());
501 if (newfd < 0)
502 die("unable to create new cachefile");
503 entries = read_cache_1(active_cache_sha1);
505 if (entries < 0)
506 die("cache corrupted");
507 active_cache_tree = read_cache_tree(active_cache_sha1);
508 for (i = 1 ; i < argc; i++) {
510 const char *path = argv[i];
511 if (allow_options && *path == '-') {
513 if (!strcmp(path, "--")) {
514 allow_options = 0;
515 continue;
516 }
517 if (!strcmp(path, "-q")) {
518 quiet = 1;
519 continue;
520 }
521 if (!strcmp(path, "--add")) {
522 allow_add = 1;
523 continue;
524 }
525 if (!strcmp(path, "--replace")) {
526 allow_replace = 1;
527 continue;
528 }
529 if (!strcmp(path, "--remove")) {
530 allow_remove = 1;
531 continue;
532 }
533 if (!strcmp(path, "--unmerged")) {
534 allow_unmerged = 1;
535 continue;
536 }
537 if (!strcmp(path, "--refresh")) {
538 has_errors |= refresh_cache(0);
539 continue;
540 }
541 if (!strcmp(path, "--really-refresh")) {
542 has_errors |= refresh_cache(1);
543 continue;
544 }
545 if (!strcmp(path, "--cacheinfo")) {
546 unsigned char sha1[20];
547 unsigned int mode;
548 if (i+3 >= argc)
550 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
551 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
553 get_sha1_hex(argv[i+2], sha1) ||
554 add_cacheinfo(mode, sha1, argv[i+3], 0))
555 die("git-update-index: --cacheinfo"
556 " cannot add %s", argv[i+3]);
557 i += 3;
558 continue;
559 }
560 if (!strcmp(path, "--chmod=-x") ||
561 !strcmp(path, "--chmod=+x")) {
562 if (argc <= i+1)
563 die("git-update-index: %s <path>", path);
564 if (chmod_path(path[8], argv[++i]))
565 die("git-update-index: %s cannot chmod %s", path, argv[i]);
566 continue;
567 }
568 if (!strcmp(path, "--assume-unchanged")) {
569 mark_valid_only = MARK_VALID;
570 continue;
571 }
572 if (!strcmp(path, "--no-assume-unchanged")) {
573 mark_valid_only = UNMARK_VALID;
574 continue;
575 }
576 if (!strcmp(path, "--info-only")) {
577 info_only = 1;
578 continue;
579 }
580 if (!strcmp(path, "--force-remove")) {
581 force_remove = 1;
582 continue;
583 }
584 if (!strcmp(path, "-z")) {
585 line_termination = 0;
586 continue;
587 }
588 if (!strcmp(path, "--stdin")) {
589 if (i != argc - 1)
590 die("--stdin must be at the end");
591 read_from_stdin = 1;
592 break;
593 }
594 if (!strcmp(path, "--index-info")) {
595 if (i != argc - 1)
596 die("--index-info must be at the end");
597 allow_add = allow_replace = allow_remove = 1;
598 read_index_info(line_termination);
599 break;
600 }
601 if (!strcmp(path, "--ignore-missing")) {
602 not_new = 1;
603 continue;
604 }
605 if (!strcmp(path, "--verbose")) {
606 verbose = 1;
607 continue;
608 }
609 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
610 usage(update_index_usage);
611 die("unknown option %s", path);
612 }
613 update_one(path, prefix, prefix_length);
614 }
615 if (read_from_stdin) {
616 struct strbuf buf;
617 strbuf_init(&buf);
618 while (1) {
619 char *path_name;
620 read_line(&buf, stdin, line_termination);
621 if (buf.eof)
622 break;
623 if (line_termination && buf.buf[0] == '"')
624 path_name = unquote_c_style(buf.buf, NULL);
625 else
626 path_name = buf.buf;
627 update_one(path_name, prefix, prefix_length);
628 if (path_name != buf.buf)
629 free(path_name);
630 }
631 }
632 if (active_cache_changed) {
633 if (write_cache_1(newfd, active_cache, active_nr,
634 active_cache_sha1) ||
635 commit_index_file(&cache_file))
636 die("Unable to write new cachefile");
637 write_cache_tree(active_cache_sha1, active_cache_tree);
638 }
639 return has_errors ? 1 : 0;
641}