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 = xmalloc(size);
118 memset(ce, 0, size);
119 memcpy(ce->name, path, namelen);
120 ce->ce_flags = htons(namelen);
121 fill_stat_cache_info(ce, &st);
122 ce->ce_mode = create_ce_mode(st.st_mode);
124 if (!trust_executable_bit) {
125 /* If there is an existing entry, pick the mode bits
126 * from it.
127 */
128 int pos = cache_name_pos(path, namelen);
129 if (0 <= pos)
130 ce->ce_mode = active_cache[pos]->ce_mode;
131 }
132 if (index_path(ce->sha1, path, &st, !info_only))
134 return -1;
135 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
136 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
137 if (add_cache_entry(ce, option))
138 return error("%s: cannot add to the index - missing --add option?",
139 path);
140 return 0;
141}
142/*
144 * "refresh" does not calculate a new sha1 file or bring the
145 * cache up-to-date for mode/content changes. But what it
146 * _does_ do is to "re-match" the stat information of a file
147 * with the cache, so that you can refresh the cache for a
148 * file that hasn't been changed but where the stat entry is
149 * out of date.
150 *
151 * For example, you'd want to do this after doing a "git-read-tree",
152 * to link up the stat cache details with the proper files.
153 */
154static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
155{
156 struct stat st;
157 struct cache_entry *updated;
158 int changed, size;
159 if (lstat(ce->name, &st) < 0)
161 return ERR_PTR(-errno);
162 changed = ce_match_stat(ce, &st, really);
164 if (!changed) {
165 if (really && assume_unchanged &&
166 !(ce->ce_flags & htons(CE_VALID)))
167 ; /* mark this one VALID again */
168 else
169 return NULL;
170 }
171 if (ce_modified(ce, &st, really))
173 return ERR_PTR(-EINVAL);
174 size = ce_size(ce);
176 updated = xmalloc(size);
177 memcpy(updated, ce, size);
178 fill_stat_cache_info(updated, &st);
179 /* In this case, if really is not set, we should leave
181 * CE_VALID bit alone. Otherwise, paths marked with
182 * --no-assume-unchanged (i.e. things to be edited) will
183 * reacquire CE_VALID bit automatically, which is not
184 * really what we want.
185 */
186 if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
187 updated->ce_flags &= ~htons(CE_VALID);
188 return updated;
190}
191static int refresh_cache(int really)
193{
194 int i;
195 int has_errors = 0;
196 for (i = 0; i < active_nr; i++) {
198 struct cache_entry *ce, *new;
199 ce = active_cache[i];
200 if (ce_stage(ce)) {
201 while ((i < active_nr) &&
202 ! strcmp(active_cache[i]->name, ce->name))
203 i++;
204 i--;
205 if (allow_unmerged)
206 continue;
207 printf("%s: needs merge\n", ce->name);
208 has_errors = 1;
209 continue;
210 }
211 new = refresh_entry(ce, really);
213 if (!new)
214 continue;
215 if (IS_ERR(new)) {
216 if (not_new && PTR_ERR(new) == -ENOENT)
217 continue;
218 if (really && PTR_ERR(new) == -EINVAL) {
219 /* If we are doing --really-refresh that
220 * means the index is not valid anymore.
221 */
222 ce->ce_flags &= ~htons(CE_VALID);
223 active_cache_changed = 1;
224 }
225 if (quiet)
226 continue;
227 printf("%s: needs update\n", ce->name);
228 has_errors = 1;
229 continue;
230 }
231 active_cache_changed = 1;
232 /* You can NOT just free active_cache[i] here, since it
233 * might not be necessarily malloc()ed but can also come
234 * from mmap(). */
235 active_cache[i] = new;
236 }
237 return has_errors;
238}
239/*
241 * We fundamentally don't like some paths: we don't want
242 * dot or dot-dot anywhere, and for obvious reasons don't
243 * want to recurse into ".git" either.
244 *
245 * Also, we don't want double slashes or slashes at the
246 * end that can make pathnames ambiguous.
247 */
248static int verify_dotfile(const char *rest)
249{
250 /*
251 * The first character was '.', but that
252 * has already been discarded, we now test
253 * the rest.
254 */
255 switch (*rest) {
256 /* "." is not allowed */
257 case '\0': case '/':
258 return 0;
259 /*
261 * ".git" followed by NUL or slash is bad. This
262 * shares the path end test with the ".." case.
263 */
264 case 'g':
265 if (rest[1] != 'i')
266 break;
267 if (rest[2] != 't')
268 break;
269 rest += 2;
270 /* fallthrough */
271 case '.':
272 if (rest[1] == '\0' || rest[1] == '/')
273 return 0;
274 }
275 return 1;
276}
277static int verify_path(const char *path)
279{
280 char c;
281 goto inside;
283 for (;;) {
284 if (!c)
285 return 1;
286 if (c == '/') {
287inside:
288 c = *path++;
289 switch (c) {
290 default:
291 continue;
292 case '/': case '\0':
293 break;
294 case '.':
295 if (verify_dotfile(path))
296 continue;
297 }
298 return 0;
299 }
300 c = *path++;
301 }
302}
303static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
305 const char *path, int stage)
306{
307 int size, len, option;
308 struct cache_entry *ce;
309 if (!verify_path(path))
311 return -1;
312 len = strlen(path);
314 size = cache_entry_size(len);
315 ce = xmalloc(size);
316 memset(ce, 0, size);
317 memcpy(ce->sha1, sha1, 20);
319 memcpy(ce->name, path, len);
320 ce->ce_flags = create_ce_flags(len, stage);
321 ce->ce_mode = create_ce_mode(mode);
322 if (assume_unchanged)
323 ce->ce_flags |= htons(CE_VALID);
324 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
325 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
326 if (add_cache_entry(ce, option))
327 return error("%s: cannot add to the index - missing --add option?",
328 path);
329 report("add '%s'", path);
330 return 0;
331}
332static int chmod_path(int flip, const char *path)
334{
335 int pos;
336 struct cache_entry *ce;
337 unsigned int mode;
338 pos = cache_name_pos(path, strlen(path));
340 if (pos < 0)
341 return -1;
342 ce = active_cache[pos];
343 mode = ntohl(ce->ce_mode);
344 if (!S_ISREG(mode))
345 return -1;
346 switch (flip) {
347 case '+':
348 ce->ce_mode |= htonl(0111); break;
349 case '-':
350 ce->ce_mode &= htonl(~0111); break;
351 default:
352 return -1;
353 }
354 active_cache_changed = 1;
355 return 0;
356}
357static struct cache_file cache_file;
359static void update_one(const char *path, const char *prefix, int prefix_length)
361{
362 const char *p = prefix_path(prefix, prefix_length, path);
363 if (!verify_path(p)) {
364 fprintf(stderr, "Ignoring path %s\n", path);
365 return;
366 }
367 if (mark_valid_only) {
368 if (mark_valid(p))
369 die("Unable to mark file %s", path);
370 return;
371 }
372 if (force_remove) {
374 if (remove_file_from_cache(p))
375 die("git-update-index: unable to remove %s", path);
376 report("remove '%s'", path);
377 return;
378 }
379 if (add_file_to_cache(p))
380 die("Unable to process file %s", path);
381 report("add '%s'", path);
382}
383static void read_index_info(int line_termination)
385{
386 struct strbuf buf;
387 strbuf_init(&buf);
388 while (1) {
389 char *ptr, *tab;
390 char *path_name;
391 unsigned char sha1[20];
392 unsigned int mode;
393 int stage;
394 /* This reads lines formatted in one of three formats:
396 *
397 * (1) mode SP sha1 TAB path
398 * The first format is what "git-apply --index-info"
399 * reports, and used to reconstruct a partial tree
400 * that is used for phony merge base tree when falling
401 * back on 3-way merge.
402 *
403 * (2) mode SP type SP sha1 TAB path
404 * The second format is to stuff git-ls-tree output
405 * into the index file.
406 *
407 * (3) mode SP sha1 SP stage TAB path
408 * This format is to put higher order stages into the
409 * index file and matches git-ls-files --stage output.
410 */
411 read_line(&buf, stdin, line_termination);
412 if (buf.eof)
413 break;
414 mode = strtoul(buf.buf, &ptr, 8);
416 if (ptr == buf.buf || *ptr != ' ')
417 goto bad_line;
418 tab = strchr(ptr, '\t');
420 if (!tab || tab - ptr < 41)
421 goto bad_line;
422 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
424 stage = tab[-1] - '0';
425 ptr = tab + 1; /* point at the head of path */
426 tab = tab - 2; /* point at tail of sha1 */
427 }
428 else {
429 stage = 0;
430 ptr = tab + 1; /* point at the head of path */
431 }
432 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
434 goto bad_line;
435 if (line_termination && ptr[0] == '"')
437 path_name = unquote_c_style(ptr, NULL);
438 else
439 path_name = ptr;
440 if (!verify_path(path_name)) {
442 fprintf(stderr, "Ignoring path %s\n", path_name);
443 if (path_name != ptr)
444 free(path_name);
445 continue;
446 }
447 if (!mode) {
449 /* mode == 0 means there is no such path -- remove */
450 if (remove_file_from_cache(path_name))
451 die("git-update-index: unable to remove %s",
452 ptr);
453 }
454 else {
455 /* mode ' ' sha1 '\t' name
456 * ptr[-1] points at tab,
457 * ptr[-41] is at the beginning of sha1
458 */
459 ptr[-42] = ptr[-1] = 0;
460 if (add_cacheinfo(mode, sha1, path_name, stage))
461 die("git-update-index: unable to update %s",
462 path_name);
463 }
464 if (path_name != ptr)
465 free(path_name);
466 continue;
467 bad_line:
469 die("malformed index info %s", buf.buf);
470 }
471}
472static const char update_index_usage[] =
474"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
475int main(int argc, const char **argv)
477{
478 int i, newfd, entries, has_errors = 0, line_termination = '\n';
479 int allow_options = 1;
480 int read_from_stdin = 0;
481 const char *prefix = setup_git_directory();
482 int prefix_length = prefix ? strlen(prefix) : 0;
483 git_config(git_default_config);
485 newfd = hold_index_file_for_update(&cache_file, get_index_file());
487 if (newfd < 0)
488 die("unable to create new cachefile");
489 entries = read_cache();
491 if (entries < 0)
492 die("cache corrupted");
493 for (i = 1 ; i < argc; i++) {
495 const char *path = argv[i];
496 if (allow_options && *path == '-') {
498 if (!strcmp(path, "--")) {
499 allow_options = 0;
500 continue;
501 }
502 if (!strcmp(path, "-q")) {
503 quiet = 1;
504 continue;
505 }
506 if (!strcmp(path, "--add")) {
507 allow_add = 1;
508 continue;
509 }
510 if (!strcmp(path, "--replace")) {
511 allow_replace = 1;
512 continue;
513 }
514 if (!strcmp(path, "--remove")) {
515 allow_remove = 1;
516 continue;
517 }
518 if (!strcmp(path, "--unmerged")) {
519 allow_unmerged = 1;
520 continue;
521 }
522 if (!strcmp(path, "--refresh")) {
523 has_errors |= refresh_cache(0);
524 continue;
525 }
526 if (!strcmp(path, "--really-refresh")) {
527 has_errors |= refresh_cache(1);
528 continue;
529 }
530 if (!strcmp(path, "--cacheinfo")) {
531 unsigned char sha1[20];
532 unsigned int mode;
533 if (i+3 >= argc)
535 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
536 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
538 get_sha1_hex(argv[i+2], sha1) ||
539 add_cacheinfo(mode, sha1, argv[i+3], 0))
540 die("git-update-index: --cacheinfo"
541 " cannot add %s", argv[i+3]);
542 i += 3;
543 continue;
544 }
545 if (!strcmp(path, "--chmod=-x") ||
546 !strcmp(path, "--chmod=+x")) {
547 if (argc <= i+1)
548 die("git-update-index: %s <path>", path);
549 if (chmod_path(path[8], argv[++i]))
550 die("git-update-index: %s cannot chmod %s", path, argv[i]);
551 continue;
552 }
553 if (!strcmp(path, "--assume-unchanged")) {
554 mark_valid_only = MARK_VALID;
555 continue;
556 }
557 if (!strcmp(path, "--no-assume-unchanged")) {
558 mark_valid_only = UNMARK_VALID;
559 continue;
560 }
561 if (!strcmp(path, "--info-only")) {
562 info_only = 1;
563 continue;
564 }
565 if (!strcmp(path, "--force-remove")) {
566 force_remove = 1;
567 continue;
568 }
569 if (!strcmp(path, "-z")) {
570 line_termination = 0;
571 continue;
572 }
573 if (!strcmp(path, "--stdin")) {
574 if (i != argc - 1)
575 die("--stdin must be at the end");
576 read_from_stdin = 1;
577 break;
578 }
579 if (!strcmp(path, "--index-info")) {
580 allow_add = allow_replace = allow_remove = 1;
581 read_index_info(line_termination);
582 continue;
583 }
584 if (!strcmp(path, "--ignore-missing")) {
585 not_new = 1;
586 continue;
587 }
588 if (!strcmp(path, "--verbose")) {
589 verbose = 1;
590 continue;
591 }
592 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
593 usage(update_index_usage);
594 die("unknown option %s", path);
595 }
596 update_one(path, prefix, prefix_length);
597 }
598 if (read_from_stdin) {
599 struct strbuf buf;
600 strbuf_init(&buf);
601 while (1) {
602 char *path_name;
603 read_line(&buf, stdin, line_termination);
604 if (buf.eof)
605 break;
606 if (line_termination && buf.buf[0] == '"')
607 path_name = unquote_c_style(buf.buf, NULL);
608 else
609 path_name = buf.buf;
610 update_one(path_name, prefix, prefix_length);
611 if (path_name != buf.buf)
612 free(path_name);
613 }
614 }
615 if (active_cache_changed) {
616 if (write_cache(newfd, active_cache, active_nr) ||
617 commit_index_file(&cache_file))
618 die("Unable to write new cachefile");
619 }
620 return has_errors ? 1 : 0;
622}