767fd49721b26eb6c48d8dc77e5f83d2364eae28
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 return NULL;
166 if (ce_modified(ce, &st, really))
168 return ERR_PTR(-EINVAL);
169 size = ce_size(ce);
171 updated = xmalloc(size);
172 memcpy(updated, ce, size);
173 fill_stat_cache_info(updated, &st);
174 return updated;
176}
177static int refresh_cache(int really)
179{
180 int i;
181 int has_errors = 0;
182 for (i = 0; i < active_nr; i++) {
184 struct cache_entry *ce, *new;
185 ce = active_cache[i];
186 if (ce_stage(ce)) {
187 while ((i < active_nr) &&
188 ! strcmp(active_cache[i]->name, ce->name))
189 i++;
190 i--;
191 if (allow_unmerged)
192 continue;
193 printf("%s: needs merge\n", ce->name);
194 has_errors = 1;
195 continue;
196 }
197 new = refresh_entry(ce, really);
199 if (!new)
200 continue;
201 if (IS_ERR(new)) {
202 if (not_new && PTR_ERR(new) == -ENOENT)
203 continue;
204 if (really && PTR_ERR(new) == -EINVAL) {
205 /* If we are doing --really-refresh that
206 * means the index is not valid anymore.
207 */
208 ce->ce_flags &= ~htons(CE_VALID);
209 active_cache_changed = 1;
210 }
211 if (quiet)
212 continue;
213 printf("%s: needs update\n", ce->name);
214 has_errors = 1;
215 continue;
216 }
217 active_cache_changed = 1;
218 /* You can NOT just free active_cache[i] here, since it
219 * might not be necessarily malloc()ed but can also come
220 * from mmap(). */
221 active_cache[i] = new;
222 }
223 return has_errors;
224}
225/*
227 * We fundamentally don't like some paths: we don't want
228 * dot or dot-dot anywhere, and for obvious reasons don't
229 * want to recurse into ".git" either.
230 *
231 * Also, we don't want double slashes or slashes at the
232 * end that can make pathnames ambiguous.
233 */
234static int verify_dotfile(const char *rest)
235{
236 /*
237 * The first character was '.', but that
238 * has already been discarded, we now test
239 * the rest.
240 */
241 switch (*rest) {
242 /* "." is not allowed */
243 case '\0': case '/':
244 return 0;
245 /*
247 * ".git" followed by NUL or slash is bad. This
248 * shares the path end test with the ".." case.
249 */
250 case 'g':
251 if (rest[1] != 'i')
252 break;
253 if (rest[2] != 't')
254 break;
255 rest += 2;
256 /* fallthrough */
257 case '.':
258 if (rest[1] == '\0' || rest[1] == '/')
259 return 0;
260 }
261 return 1;
262}
263static int verify_path(const char *path)
265{
266 char c;
267 goto inside;
269 for (;;) {
270 if (!c)
271 return 1;
272 if (c == '/') {
273inside:
274 c = *path++;
275 switch (c) {
276 default:
277 continue;
278 case '/': case '\0':
279 break;
280 case '.':
281 if (verify_dotfile(path))
282 continue;
283 }
284 return 0;
285 }
286 c = *path++;
287 }
288}
289static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
291 const char *path, int stage)
292{
293 int size, len, option;
294 struct cache_entry *ce;
295 if (!verify_path(path))
297 return -1;
298 len = strlen(path);
300 size = cache_entry_size(len);
301 ce = xmalloc(size);
302 memset(ce, 0, size);
303 memcpy(ce->sha1, sha1, 20);
305 memcpy(ce->name, path, len);
306 ce->ce_flags = create_ce_flags(len, stage);
307 ce->ce_mode = create_ce_mode(mode);
308 if (assume_unchanged)
309 ce->ce_flags |= htons(CE_VALID);
310 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
311 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
312 if (add_cache_entry(ce, option))
313 return error("%s: cannot add to the index - missing --add option?",
314 path);
315 report("add '%s'", path);
316 return 0;
317}
318static int chmod_path(int flip, const char *path)
320{
321 int pos;
322 struct cache_entry *ce;
323 unsigned int mode;
324 pos = cache_name_pos(path, strlen(path));
326 if (pos < 0)
327 return -1;
328 ce = active_cache[pos];
329 mode = ntohl(ce->ce_mode);
330 if (!S_ISREG(mode))
331 return -1;
332 switch (flip) {
333 case '+':
334 ce->ce_mode |= htonl(0111); break;
335 case '-':
336 ce->ce_mode &= htonl(~0111); break;
337 default:
338 return -1;
339 }
340 active_cache_changed = 1;
341 return 0;
342}
343static struct cache_file cache_file;
345static void update_one(const char *path, const char *prefix, int prefix_length)
347{
348 const char *p = prefix_path(prefix, prefix_length, path);
349 if (!verify_path(p)) {
350 fprintf(stderr, "Ignoring path %s\n", path);
351 return;
352 }
353 if (mark_valid_only) {
354 if (mark_valid(p))
355 die("Unable to mark file %s", path);
356 return;
357 }
358 if (force_remove) {
360 if (remove_file_from_cache(p))
361 die("git-update-index: unable to remove %s", path);
362 report("remove '%s'", path);
363 return;
364 }
365 if (add_file_to_cache(p))
366 die("Unable to process file %s", path);
367 report("add '%s'", path);
368}
369static void read_index_info(int line_termination)
371{
372 struct strbuf buf;
373 strbuf_init(&buf);
374 while (1) {
375 char *ptr, *tab;
376 char *path_name;
377 unsigned char sha1[20];
378 unsigned int mode;
379 int stage;
380 /* This reads lines formatted in one of three formats:
382 *
383 * (1) mode SP sha1 TAB path
384 * The first format is what "git-apply --index-info"
385 * reports, and used to reconstruct a partial tree
386 * that is used for phony merge base tree when falling
387 * back on 3-way merge.
388 *
389 * (2) mode SP type SP sha1 TAB path
390 * The second format is to stuff git-ls-tree output
391 * into the index file.
392 *
393 * (3) mode SP sha1 SP stage TAB path
394 * This format is to put higher order stages into the
395 * index file and matches git-ls-files --stage output.
396 */
397 read_line(&buf, stdin, line_termination);
398 if (buf.eof)
399 break;
400 mode = strtoul(buf.buf, &ptr, 8);
402 if (ptr == buf.buf || *ptr != ' ')
403 goto bad_line;
404 tab = strchr(ptr, '\t');
406 if (!tab || tab - ptr < 41)
407 goto bad_line;
408 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
410 stage = tab[-1] - '0';
411 ptr = tab + 1; /* point at the head of path */
412 tab = tab - 2; /* point at tail of sha1 */
413 }
414 else {
415 stage = 0;
416 ptr = tab + 1; /* point at the head of path */
417 }
418 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
420 goto bad_line;
421 if (line_termination && ptr[0] == '"')
423 path_name = unquote_c_style(ptr, NULL);
424 else
425 path_name = ptr;
426 if (!verify_path(path_name)) {
428 fprintf(stderr, "Ignoring path %s\n", path_name);
429 if (path_name != ptr)
430 free(path_name);
431 continue;
432 }
433 if (!mode) {
435 /* mode == 0 means there is no such path -- remove */
436 if (remove_file_from_cache(path_name))
437 die("git-update-index: unable to remove %s",
438 ptr);
439 }
440 else {
441 /* mode ' ' sha1 '\t' name
442 * ptr[-1] points at tab,
443 * ptr[-41] is at the beginning of sha1
444 */
445 ptr[-42] = ptr[-1] = 0;
446 if (add_cacheinfo(mode, sha1, path_name, stage))
447 die("git-update-index: unable to update %s",
448 path_name);
449 }
450 if (path_name != ptr)
451 free(path_name);
452 continue;
453 bad_line:
455 die("malformed index info %s", buf.buf);
456 }
457}
458static const char update_index_usage[] =
460"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
461int main(int argc, const char **argv)
463{
464 int i, newfd, entries, has_errors = 0, line_termination = '\n';
465 int allow_options = 1;
466 int read_from_stdin = 0;
467 const char *prefix = setup_git_directory();
468 int prefix_length = prefix ? strlen(prefix) : 0;
469 git_config(git_default_config);
471 newfd = hold_index_file_for_update(&cache_file, get_index_file());
473 if (newfd < 0)
474 die("unable to create new cachefile");
475 entries = read_cache();
477 if (entries < 0)
478 die("cache corrupted");
479 for (i = 1 ; i < argc; i++) {
481 const char *path = argv[i];
482 if (allow_options && *path == '-') {
484 if (!strcmp(path, "--")) {
485 allow_options = 0;
486 continue;
487 }
488 if (!strcmp(path, "-q")) {
489 quiet = 1;
490 continue;
491 }
492 if (!strcmp(path, "--add")) {
493 allow_add = 1;
494 continue;
495 }
496 if (!strcmp(path, "--replace")) {
497 allow_replace = 1;
498 continue;
499 }
500 if (!strcmp(path, "--remove")) {
501 allow_remove = 1;
502 continue;
503 }
504 if (!strcmp(path, "--unmerged")) {
505 allow_unmerged = 1;
506 continue;
507 }
508 if (!strcmp(path, "--refresh")) {
509 has_errors |= refresh_cache(0);
510 continue;
511 }
512 if (!strcmp(path, "--really-refresh")) {
513 has_errors |= refresh_cache(1);
514 continue;
515 }
516 if (!strcmp(path, "--cacheinfo")) {
517 unsigned char sha1[20];
518 unsigned int mode;
519 if (i+3 >= argc)
521 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
522 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
524 get_sha1_hex(argv[i+2], sha1) ||
525 add_cacheinfo(mode, sha1, argv[i+3], 0))
526 die("git-update-index: --cacheinfo"
527 " cannot add %s", argv[i+3]);
528 i += 3;
529 continue;
530 }
531 if (!strcmp(path, "--chmod=-x") ||
532 !strcmp(path, "--chmod=+x")) {
533 if (argc <= i+1)
534 die("git-update-index: %s <path>", path);
535 if (chmod_path(path[8], argv[++i]))
536 die("git-update-index: %s cannot chmod %s", path, argv[i]);
537 continue;
538 }
539 if (!strcmp(path, "--assume-unchanged")) {
540 mark_valid_only = MARK_VALID;
541 continue;
542 }
543 if (!strcmp(path, "--no-assume-unchanged")) {
544 mark_valid_only = UNMARK_VALID;
545 continue;
546 }
547 if (!strcmp(path, "--info-only")) {
548 info_only = 1;
549 continue;
550 }
551 if (!strcmp(path, "--force-remove")) {
552 force_remove = 1;
553 continue;
554 }
555 if (!strcmp(path, "-z")) {
556 line_termination = 0;
557 continue;
558 }
559 if (!strcmp(path, "--stdin")) {
560 if (i != argc - 1)
561 die("--stdin must be at the end");
562 read_from_stdin = 1;
563 break;
564 }
565 if (!strcmp(path, "--index-info")) {
566 allow_add = allow_replace = allow_remove = 1;
567 read_index_info(line_termination);
568 continue;
569 }
570 if (!strcmp(path, "--ignore-missing")) {
571 not_new = 1;
572 continue;
573 }
574 if (!strcmp(path, "--verbose")) {
575 verbose = 1;
576 continue;
577 }
578 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
579 usage(update_index_usage);
580 die("unknown option %s", path);
581 }
582 update_one(path, prefix, prefix_length);
583 }
584 if (read_from_stdin) {
585 struct strbuf buf;
586 strbuf_init(&buf);
587 while (1) {
588 char *path_name;
589 read_line(&buf, stdin, line_termination);
590 if (buf.eof)
591 break;
592 if (line_termination && buf.buf[0] == '"')
593 path_name = unquote_c_style(buf.buf, NULL);
594 else
595 path_name = buf.buf;
596 update_one(path_name, prefix, prefix_length);
597 if (path_name != buf.buf)
598 free(path_name);
599 }
600 }
601 if (active_cache_changed) {
602 if (write_cache(newfd, active_cache, active_nr) ||
603 commit_index_file(&cache_file))
604 die("Unable to write new cachefile");
605 }
606 return has_errors ? 1 : 0;
608}