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/*
11 * Default to not allowing changes to the list of files. The
12 * tool doesn't actually care, but this makes it harder to add
13 * files to the revision control by mistake by doing something
14 * like "git-update-index *" and suddenly having all the object
15 * files be revision controlled.
16 */
17static int allow_add;
18static int allow_remove;
19static int allow_replace;
20static int allow_unmerged; /* --refresh needing merge is not error */
21static int not_new; /* --refresh not having working tree files is not error */
22static int quiet; /* --refresh needing update is not error */
23static int info_only;
24static int force_remove;
25static int verbose;
26static int mark_valid_only = 0;
27#define MARK_VALID 1
28#define UNMARK_VALID 2
29/* Three functions to allow overloaded pointer return; see linux/err.h */
32static inline void *ERR_PTR(long error)
33{
34 return (void *) error;
35}
36static inline long PTR_ERR(const void *ptr)
38{
39 return (long) ptr;
40}
41static inline long IS_ERR(const void *ptr)
43{
44 return (unsigned long)ptr > (unsigned long)-1000L;
45}
46static void report(const char *fmt, ...)
48{
49 va_list vp;
50 if (!verbose)
52 return;
53 va_start(vp, fmt);
55 vprintf(fmt, vp);
56 putchar('\n');
57 va_end(vp);
58}
59static int mark_valid(const char *path)
61{
62 int namelen = strlen(path);
63 int pos = cache_name_pos(path, namelen);
64 if (0 <= pos) {
65 switch (mark_valid_only) {
66 case MARK_VALID:
67 active_cache[pos]->ce_flags |= htons(CE_VALID);
68 break;
69 case UNMARK_VALID:
70 active_cache[pos]->ce_flags &= ~htons(CE_VALID);
71 break;
72 }
73 active_cache_changed = 1;
74 return 0;
75 }
76 return -1;
77}
78static int add_file_to_cache(const char *path)
80{
81 int size, namelen, option, status;
82 struct cache_entry *ce;
83 struct stat st;
84 status = lstat(path, &st);
86 if (status < 0 || S_ISDIR(st.st_mode)) {
87 /* When we used to have "path" and now we want to add
88 * "path/file", we need a way to remove "path" before
89 * being able to add "path/file". However,
90 * "git-update-index --remove path" would not work.
91 * --force-remove can be used but this is more user
92 * friendly, especially since we can do the opposite
93 * case just fine without --force-remove.
94 */
95 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
96 if (allow_remove) {
97 if (remove_file_from_cache(path))
98 return error("%s: cannot remove from the index",
99 path);
100 else
101 return 0;
102 } else if (status < 0) {
103 return error("%s: does not exist and --remove not passed",
104 path);
105 }
106 }
107 if (0 == status)
108 return error("%s: is a directory - add files inside instead",
109 path);
110 else
111 return error("lstat(\"%s\"): %s", path,
112 strerror(errno));
113 }
114 namelen = strlen(path);
116 size = cache_entry_size(namelen);
117 ce = xcalloc(1, size);
118 memcpy(ce->name, path, namelen);
119 ce->ce_flags = htons(namelen);
120 fill_stat_cache_info(ce, &st);
121 ce->ce_mode = create_ce_mode(st.st_mode);
123 if (!trust_executable_bit) {
124 /* If there is an existing entry, pick the mode bits
125 * from it.
126 */
127 int pos = cache_name_pos(path, namelen);
128 if (0 <= pos)
129 ce->ce_mode = active_cache[pos]->ce_mode;
130 }
131 if (index_path(ce->sha1, path, &st, !info_only))
133 return -1;
134 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
135 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
136 if (add_cache_entry(ce, option))
137 return error("%s: cannot add to the index - missing --add option?",
138 path);
139 return 0;
140}
141/*
143 * "refresh" does not calculate a new sha1 file or bring the
144 * cache up-to-date for mode/content changes. But what it
145 * _does_ do is to "re-match" the stat information of a file
146 * with the cache, so that you can refresh the cache for a
147 * file that hasn't been changed but where the stat entry is
148 * out of date.
149 *
150 * For example, you'd want to do this after doing a "git-read-tree",
151 * to link up the stat cache details with the proper files.
152 */
153static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
154{
155 struct stat st;
156 struct cache_entry *updated;
157 int changed, size;
158 if (lstat(ce->name, &st) < 0)
160 return ERR_PTR(-errno);
161 changed = ce_match_stat(ce, &st, really);
163 if (!changed) {
164 if (really && assume_unchanged &&
165 !(ce->ce_flags & htons(CE_VALID)))
166 ; /* mark this one VALID again */
167 else
168 return NULL;
169 }
170 if (ce_modified(ce, &st, really))
172 return ERR_PTR(-EINVAL);
173 size = ce_size(ce);
175 updated = xmalloc(size);
176 memcpy(updated, ce, size);
177 fill_stat_cache_info(updated, &st);
178 /* In this case, if really is not set, we should leave
180 * CE_VALID bit alone. Otherwise, paths marked with
181 * --no-assume-unchanged (i.e. things to be edited) will
182 * reacquire CE_VALID bit automatically, which is not
183 * really what we want.
184 */
185 if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
186 updated->ce_flags &= ~htons(CE_VALID);
187 return updated;
189}
190static int refresh_cache(int really)
192{
193 int i;
194 int has_errors = 0;
195 for (i = 0; i < active_nr; i++) {
197 struct cache_entry *ce, *new;
198 ce = active_cache[i];
199 if (ce_stage(ce)) {
200 while ((i < active_nr) &&
201 ! strcmp(active_cache[i]->name, ce->name))
202 i++;
203 i--;
204 if (allow_unmerged)
205 continue;
206 printf("%s: needs merge\n", ce->name);
207 has_errors = 1;
208 continue;
209 }
210 new = refresh_entry(ce, really);
212 if (!new)
213 continue;
214 if (IS_ERR(new)) {
215 if (not_new && PTR_ERR(new) == -ENOENT)
216 continue;
217 if (really && PTR_ERR(new) == -EINVAL) {
218 /* If we are doing --really-refresh that
219 * means the index is not valid anymore.
220 */
221 ce->ce_flags &= ~htons(CE_VALID);
222 active_cache_changed = 1;
223 }
224 if (quiet)
225 continue;
226 printf("%s: needs update\n", ce->name);
227 has_errors = 1;
228 continue;
229 }
230 active_cache_changed = 1;
231 /* You can NOT just free active_cache[i] here, since it
232 * might not be necessarily malloc()ed but can also come
233 * from mmap(). */
234 active_cache[i] = new;
235 }
236 return has_errors;
237}
238/*
240 * We fundamentally don't like some paths: we don't want
241 * dot or dot-dot anywhere, and for obvious reasons don't
242 * want to recurse into ".git" either.
243 *
244 * Also, we don't want double slashes or slashes at the
245 * end that can make pathnames ambiguous.
246 */
247static int verify_dotfile(const char *rest)
248{
249 /*
250 * The first character was '.', but that
251 * has already been discarded, we now test
252 * the rest.
253 */
254 switch (*rest) {
255 /* "." is not allowed */
256 case '\0': case '/':
257 return 0;
258 /*
260 * ".git" followed by NUL or slash is bad. This
261 * shares the path end test with the ".." case.
262 */
263 case 'g':
264 if (rest[1] != 'i')
265 break;
266 if (rest[2] != 't')
267 break;
268 rest += 2;
269 /* fallthrough */
270 case '.':
271 if (rest[1] == '\0' || rest[1] == '/')
272 return 0;
273 }
274 return 1;
275}
276static int verify_path(const char *path)
278{
279 char c;
280 goto inside;
282 for (;;) {
283 if (!c)
284 return 1;
285 if (c == '/') {
286inside:
287 c = *path++;
288 switch (c) {
289 default:
290 continue;
291 case '/': case '\0':
292 break;
293 case '.':
294 if (verify_dotfile(path))
295 continue;
296 }
297 return 0;
298 }
299 c = *path++;
300 }
301}
302static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
304 const char *path, int stage)
305{
306 int size, len, option;
307 struct cache_entry *ce;
308 if (!verify_path(path))
310 return -1;
311 len = strlen(path);
313 size = cache_entry_size(len);
314 ce = xcalloc(1, size);
315 memcpy(ce->sha1, sha1, 20);
317 memcpy(ce->name, path, len);
318 ce->ce_flags = create_ce_flags(len, stage);
319 ce->ce_mode = create_ce_mode(mode);
320 if (assume_unchanged)
321 ce->ce_flags |= htons(CE_VALID);
322 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
323 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
324 if (add_cache_entry(ce, option))
325 return error("%s: cannot add to the index - missing --add option?",
326 path);
327 report("add '%s'", path);
328 return 0;
329}
330static void chmod_path(int flip, const char *path)
332{
333 int pos;
334 struct cache_entry *ce;
335 unsigned int mode;
336 pos = cache_name_pos(path, strlen(path));
338 if (pos < 0)
339 goto fail;
340 ce = active_cache[pos];
341 mode = ntohl(ce->ce_mode);
342 if (!S_ISREG(mode))
343 goto fail;
344 switch (flip) {
345 case '+':
346 ce->ce_mode |= htonl(0111); break;
347 case '-':
348 ce->ce_mode &= htonl(~0111); break;
349 default:
350 goto fail;
351 }
352 active_cache_changed = 1;
353 report("chmod %cx '%s'", flip, path);
354 return;
355 fail:
356 die("git-update-index: cannot chmod %cx '%s'", flip, path);
357}
358static struct cache_file cache_file;
360static void update_one(const char *path, const char *prefix, int prefix_length)
362{
363 const char *p = prefix_path(prefix, prefix_length, path);
364 if (!verify_path(p)) {
365 fprintf(stderr, "Ignoring path %s\n", path);
366 return;
367 }
368 if (mark_valid_only) {
369 if (mark_valid(p))
370 die("Unable to mark file %s", path);
371 return;
372 }
373 if (force_remove) {
375 if (remove_file_from_cache(p))
376 die("git-update-index: unable to remove %s", path);
377 report("remove '%s'", path);
378 return;
379 }
380 if (add_file_to_cache(p))
381 die("Unable to process file %s", path);
382 report("add '%s'", path);
383}
384static void read_index_info(int line_termination)
386{
387 struct strbuf buf;
388 strbuf_init(&buf);
389 while (1) {
390 char *ptr, *tab;
391 char *path_name;
392 unsigned char sha1[20];
393 unsigned int mode;
394 int stage;
395 /* This reads lines formatted in one of three formats:
397 *
398 * (1) mode SP sha1 TAB path
399 * The first format is what "git-apply --index-info"
400 * reports, and used to reconstruct a partial tree
401 * that is used for phony merge base tree when falling
402 * back on 3-way merge.
403 *
404 * (2) mode SP type SP sha1 TAB path
405 * The second format is to stuff git-ls-tree output
406 * into the index file.
407 *
408 * (3) mode SP sha1 SP stage TAB path
409 * This format is to put higher order stages into the
410 * index file and matches git-ls-files --stage output.
411 */
412 read_line(&buf, stdin, line_termination);
413 if (buf.eof)
414 break;
415 mode = strtoul(buf.buf, &ptr, 8);
417 if (ptr == buf.buf || *ptr != ' ')
418 goto bad_line;
419 tab = strchr(ptr, '\t');
421 if (!tab || tab - ptr < 41)
422 goto bad_line;
423 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
425 stage = tab[-1] - '0';
426 ptr = tab + 1; /* point at the head of path */
427 tab = tab - 2; /* point at tail of sha1 */
428 }
429 else {
430 stage = 0;
431 ptr = tab + 1; /* point at the head of path */
432 }
433 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
435 goto bad_line;
436 if (line_termination && ptr[0] == '"')
438 path_name = unquote_c_style(ptr, NULL);
439 else
440 path_name = ptr;
441 if (!verify_path(path_name)) {
443 fprintf(stderr, "Ignoring path %s\n", path_name);
444 if (path_name != ptr)
445 free(path_name);
446 continue;
447 }
448 if (!mode) {
450 /* mode == 0 means there is no such path -- remove */
451 if (remove_file_from_cache(path_name))
452 die("git-update-index: unable to remove %s",
453 ptr);
454 }
455 else {
456 /* mode ' ' sha1 '\t' name
457 * ptr[-1] points at tab,
458 * ptr[-41] is at the beginning of sha1
459 */
460 ptr[-42] = ptr[-1] = 0;
461 if (add_cacheinfo(mode, sha1, path_name, stage))
462 die("git-update-index: unable to update %s",
463 path_name);
464 }
465 if (path_name != ptr)
466 free(path_name);
467 continue;
468 bad_line:
470 die("malformed index info %s", buf.buf);
471 }
472}
473static const char update_index_usage[] =
475"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
476int main(int argc, const char **argv)
478{
479 int i, newfd, entries, has_errors = 0, line_termination = '\n';
480 int allow_options = 1;
481 int read_from_stdin = 0;
482 const char *prefix = setup_git_directory();
483 int prefix_length = prefix ? strlen(prefix) : 0;
484 char set_executable_bit = 0;
485 git_config(git_default_config);
487 newfd = hold_index_file_for_update(&cache_file, get_index_file());
489 if (newfd < 0)
490 die("unable to create new cachefile");
491 entries = read_cache();
493 if (entries < 0)
494 die("cache corrupted");
495 for (i = 1 ; i < argc; i++) {
497 const char *path = argv[i];
498 if (allow_options && *path == '-') {
500 if (!strcmp(path, "--")) {
501 allow_options = 0;
502 continue;
503 }
504 if (!strcmp(path, "-q")) {
505 quiet = 1;
506 continue;
507 }
508 if (!strcmp(path, "--add")) {
509 allow_add = 1;
510 continue;
511 }
512 if (!strcmp(path, "--replace")) {
513 allow_replace = 1;
514 continue;
515 }
516 if (!strcmp(path, "--remove")) {
517 allow_remove = 1;
518 continue;
519 }
520 if (!strcmp(path, "--unmerged")) {
521 allow_unmerged = 1;
522 continue;
523 }
524 if (!strcmp(path, "--refresh")) {
525 has_errors |= refresh_cache(0);
526 continue;
527 }
528 if (!strcmp(path, "--really-refresh")) {
529 has_errors |= refresh_cache(1);
530 continue;
531 }
532 if (!strcmp(path, "--cacheinfo")) {
533 unsigned char sha1[20];
534 unsigned int mode;
535 if (i+3 >= argc)
537 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
538 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
540 get_sha1_hex(argv[i+2], sha1) ||
541 add_cacheinfo(mode, sha1, argv[i+3], 0))
542 die("git-update-index: --cacheinfo"
543 " cannot add %s", argv[i+3]);
544 i += 3;
545 continue;
546 }
547 if (!strcmp(path, "--chmod=-x") ||
548 !strcmp(path, "--chmod=+x")) {
549 if (argc <= i+1)
550 die("git-update-index: %s <path>", path);
551 set_executable_bit = path[8];
552 continue;
553 }
554 if (!strcmp(path, "--assume-unchanged")) {
555 mark_valid_only = MARK_VALID;
556 continue;
557 }
558 if (!strcmp(path, "--no-assume-unchanged")) {
559 mark_valid_only = UNMARK_VALID;
560 continue;
561 }
562 if (!strcmp(path, "--info-only")) {
563 info_only = 1;
564 continue;
565 }
566 if (!strcmp(path, "--force-remove")) {
567 force_remove = 1;
568 continue;
569 }
570 if (!strcmp(path, "-z")) {
571 line_termination = 0;
572 continue;
573 }
574 if (!strcmp(path, "--stdin")) {
575 if (i != argc - 1)
576 die("--stdin must be at the end");
577 read_from_stdin = 1;
578 break;
579 }
580 if (!strcmp(path, "--index-info")) {
581 if (i != argc - 1)
582 die("--index-info must be at the end");
583 allow_add = allow_replace = allow_remove = 1;
584 read_index_info(line_termination);
585 break;
586 }
587 if (!strcmp(path, "--ignore-missing")) {
588 not_new = 1;
589 continue;
590 }
591 if (!strcmp(path, "--verbose")) {
592 verbose = 1;
593 continue;
594 }
595 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
596 usage(update_index_usage);
597 die("unknown option %s", path);
598 }
599 update_one(path, prefix, prefix_length);
600 if (set_executable_bit)
601 chmod_path(set_executable_bit, path);
602 }
603 if (read_from_stdin) {
604 struct strbuf buf;
605 strbuf_init(&buf);
606 while (1) {
607 char *path_name;
608 read_line(&buf, stdin, line_termination);
609 if (buf.eof)
610 break;
611 if (line_termination && buf.buf[0] == '"')
612 path_name = unquote_c_style(buf.buf, NULL);
613 else
614 path_name = buf.buf;
615 update_one(path_name, prefix, prefix_length);
616 if (set_executable_bit) {
617 const char *p = prefix_path(prefix, prefix_length, path_name);
618 chmod_path(set_executable_bit, p);
619 }
620 if (path_name != buf.buf)
621 free(path_name);
622 }
623 }
624 if (active_cache_changed) {
625 if (write_cache(newfd, active_cache, active_nr) ||
626 commit_index_file(&cache_file))
627 die("Unable to write new cachefile");
628 }
629 return has_errors ? 1 : 0;
631}