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 /* In this case, if really is not set, we should leave
176 * CE_VALID bit alone. Otherwise, paths marked with
177 * --no-assume-unchanged (i.e. things to be edited) will
178 * reacquire CE_VALID bit automatically, which is not
179 * really what we want.
180 */
181 if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
182 updated->ce_flags &= ~htons(CE_VALID);
183 return updated;
185}
186static int refresh_cache(int really)
188{
189 int i;
190 int has_errors = 0;
191 for (i = 0; i < active_nr; i++) {
193 struct cache_entry *ce, *new;
194 ce = active_cache[i];
195 if (ce_stage(ce)) {
196 while ((i < active_nr) &&
197 ! strcmp(active_cache[i]->name, ce->name))
198 i++;
199 i--;
200 if (allow_unmerged)
201 continue;
202 printf("%s: needs merge\n", ce->name);
203 has_errors = 1;
204 continue;
205 }
206 new = refresh_entry(ce, really);
208 if (!new)
209 continue;
210 if (IS_ERR(new)) {
211 if (not_new && PTR_ERR(new) == -ENOENT)
212 continue;
213 if (really && PTR_ERR(new) == -EINVAL) {
214 /* If we are doing --really-refresh that
215 * means the index is not valid anymore.
216 */
217 ce->ce_flags &= ~htons(CE_VALID);
218 active_cache_changed = 1;
219 }
220 if (quiet)
221 continue;
222 printf("%s: needs update\n", ce->name);
223 has_errors = 1;
224 continue;
225 }
226 active_cache_changed = 1;
227 /* You can NOT just free active_cache[i] here, since it
228 * might not be necessarily malloc()ed but can also come
229 * from mmap(). */
230 active_cache[i] = new;
231 }
232 return has_errors;
233}
234/*
236 * We fundamentally don't like some paths: we don't want
237 * dot or dot-dot anywhere, and for obvious reasons don't
238 * want to recurse into ".git" either.
239 *
240 * Also, we don't want double slashes or slashes at the
241 * end that can make pathnames ambiguous.
242 */
243static int verify_dotfile(const char *rest)
244{
245 /*
246 * The first character was '.', but that
247 * has already been discarded, we now test
248 * the rest.
249 */
250 switch (*rest) {
251 /* "." is not allowed */
252 case '\0': case '/':
253 return 0;
254 /*
256 * ".git" followed by NUL or slash is bad. This
257 * shares the path end test with the ".." case.
258 */
259 case 'g':
260 if (rest[1] != 'i')
261 break;
262 if (rest[2] != 't')
263 break;
264 rest += 2;
265 /* fallthrough */
266 case '.':
267 if (rest[1] == '\0' || rest[1] == '/')
268 return 0;
269 }
270 return 1;
271}
272static int verify_path(const char *path)
274{
275 char c;
276 goto inside;
278 for (;;) {
279 if (!c)
280 return 1;
281 if (c == '/') {
282inside:
283 c = *path++;
284 switch (c) {
285 default:
286 continue;
287 case '/': case '\0':
288 break;
289 case '.':
290 if (verify_dotfile(path))
291 continue;
292 }
293 return 0;
294 }
295 c = *path++;
296 }
297}
298static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
300 const char *path, int stage)
301{
302 int size, len, option;
303 struct cache_entry *ce;
304 if (!verify_path(path))
306 return -1;
307 len = strlen(path);
309 size = cache_entry_size(len);
310 ce = xmalloc(size);
311 memset(ce, 0, size);
312 memcpy(ce->sha1, sha1, 20);
314 memcpy(ce->name, path, len);
315 ce->ce_flags = create_ce_flags(len, stage);
316 ce->ce_mode = create_ce_mode(mode);
317 if (assume_unchanged)
318 ce->ce_flags |= htons(CE_VALID);
319 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
320 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
321 if (add_cache_entry(ce, option))
322 return error("%s: cannot add to the index - missing --add option?",
323 path);
324 report("add '%s'", path);
325 return 0;
326}
327static int chmod_path(int flip, const char *path)
329{
330 int pos;
331 struct cache_entry *ce;
332 unsigned int mode;
333 pos = cache_name_pos(path, strlen(path));
335 if (pos < 0)
336 return -1;
337 ce = active_cache[pos];
338 mode = ntohl(ce->ce_mode);
339 if (!S_ISREG(mode))
340 return -1;
341 switch (flip) {
342 case '+':
343 ce->ce_mode |= htonl(0111); break;
344 case '-':
345 ce->ce_mode &= htonl(~0111); break;
346 default:
347 return -1;
348 }
349 active_cache_changed = 1;
350 return 0;
351}
352static struct cache_file cache_file;
354static void update_one(const char *path, const char *prefix, int prefix_length)
356{
357 const char *p = prefix_path(prefix, prefix_length, path);
358 if (!verify_path(p)) {
359 fprintf(stderr, "Ignoring path %s\n", path);
360 return;
361 }
362 if (mark_valid_only) {
363 if (mark_valid(p))
364 die("Unable to mark file %s", path);
365 return;
366 }
367 if (force_remove) {
369 if (remove_file_from_cache(p))
370 die("git-update-index: unable to remove %s", path);
371 report("remove '%s'", path);
372 return;
373 }
374 if (add_file_to_cache(p))
375 die("Unable to process file %s", path);
376 report("add '%s'", path);
377}
378static void read_index_info(int line_termination)
380{
381 struct strbuf buf;
382 strbuf_init(&buf);
383 while (1) {
384 char *ptr, *tab;
385 char *path_name;
386 unsigned char sha1[20];
387 unsigned int mode;
388 int stage;
389 /* This reads lines formatted in one of three formats:
391 *
392 * (1) mode SP sha1 TAB path
393 * The first format is what "git-apply --index-info"
394 * reports, and used to reconstruct a partial tree
395 * that is used for phony merge base tree when falling
396 * back on 3-way merge.
397 *
398 * (2) mode SP type SP sha1 TAB path
399 * The second format is to stuff git-ls-tree output
400 * into the index file.
401 *
402 * (3) mode SP sha1 SP stage TAB path
403 * This format is to put higher order stages into the
404 * index file and matches git-ls-files --stage output.
405 */
406 read_line(&buf, stdin, line_termination);
407 if (buf.eof)
408 break;
409 mode = strtoul(buf.buf, &ptr, 8);
411 if (ptr == buf.buf || *ptr != ' ')
412 goto bad_line;
413 tab = strchr(ptr, '\t');
415 if (!tab || tab - ptr < 41)
416 goto bad_line;
417 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
419 stage = tab[-1] - '0';
420 ptr = tab + 1; /* point at the head of path */
421 tab = tab - 2; /* point at tail of sha1 */
422 }
423 else {
424 stage = 0;
425 ptr = tab + 1; /* point at the head of path */
426 }
427 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
429 goto bad_line;
430 if (line_termination && ptr[0] == '"')
432 path_name = unquote_c_style(ptr, NULL);
433 else
434 path_name = ptr;
435 if (!verify_path(path_name)) {
437 fprintf(stderr, "Ignoring path %s\n", path_name);
438 if (path_name != ptr)
439 free(path_name);
440 continue;
441 }
442 if (!mode) {
444 /* mode == 0 means there is no such path -- remove */
445 if (remove_file_from_cache(path_name))
446 die("git-update-index: unable to remove %s",
447 ptr);
448 }
449 else {
450 /* mode ' ' sha1 '\t' name
451 * ptr[-1] points at tab,
452 * ptr[-41] is at the beginning of sha1
453 */
454 ptr[-42] = ptr[-1] = 0;
455 if (add_cacheinfo(mode, sha1, path_name, stage))
456 die("git-update-index: unable to update %s",
457 path_name);
458 }
459 if (path_name != ptr)
460 free(path_name);
461 continue;
462 bad_line:
464 die("malformed index info %s", buf.buf);
465 }
466}
467static const char update_index_usage[] =
469"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
470int main(int argc, const char **argv)
472{
473 int i, newfd, entries, has_errors = 0, line_termination = '\n';
474 int allow_options = 1;
475 int read_from_stdin = 0;
476 const char *prefix = setup_git_directory();
477 int prefix_length = prefix ? strlen(prefix) : 0;
478 git_config(git_default_config);
480 newfd = hold_index_file_for_update(&cache_file, get_index_file());
482 if (newfd < 0)
483 die("unable to create new cachefile");
484 entries = read_cache();
486 if (entries < 0)
487 die("cache corrupted");
488 for (i = 1 ; i < argc; i++) {
490 const char *path = argv[i];
491 if (allow_options && *path == '-') {
493 if (!strcmp(path, "--")) {
494 allow_options = 0;
495 continue;
496 }
497 if (!strcmp(path, "-q")) {
498 quiet = 1;
499 continue;
500 }
501 if (!strcmp(path, "--add")) {
502 allow_add = 1;
503 continue;
504 }
505 if (!strcmp(path, "--replace")) {
506 allow_replace = 1;
507 continue;
508 }
509 if (!strcmp(path, "--remove")) {
510 allow_remove = 1;
511 continue;
512 }
513 if (!strcmp(path, "--unmerged")) {
514 allow_unmerged = 1;
515 continue;
516 }
517 if (!strcmp(path, "--refresh")) {
518 has_errors |= refresh_cache(0);
519 continue;
520 }
521 if (!strcmp(path, "--really-refresh")) {
522 has_errors |= refresh_cache(1);
523 continue;
524 }
525 if (!strcmp(path, "--cacheinfo")) {
526 unsigned char sha1[20];
527 unsigned int mode;
528 if (i+3 >= argc)
530 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
531 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
533 get_sha1_hex(argv[i+2], sha1) ||
534 add_cacheinfo(mode, sha1, argv[i+3], 0))
535 die("git-update-index: --cacheinfo"
536 " cannot add %s", argv[i+3]);
537 i += 3;
538 continue;
539 }
540 if (!strcmp(path, "--chmod=-x") ||
541 !strcmp(path, "--chmod=+x")) {
542 if (argc <= i+1)
543 die("git-update-index: %s <path>", path);
544 if (chmod_path(path[8], argv[++i]))
545 die("git-update-index: %s cannot chmod %s", path, argv[i]);
546 continue;
547 }
548 if (!strcmp(path, "--assume-unchanged")) {
549 mark_valid_only = MARK_VALID;
550 continue;
551 }
552 if (!strcmp(path, "--no-assume-unchanged")) {
553 mark_valid_only = UNMARK_VALID;
554 continue;
555 }
556 if (!strcmp(path, "--info-only")) {
557 info_only = 1;
558 continue;
559 }
560 if (!strcmp(path, "--force-remove")) {
561 force_remove = 1;
562 continue;
563 }
564 if (!strcmp(path, "-z")) {
565 line_termination = 0;
566 continue;
567 }
568 if (!strcmp(path, "--stdin")) {
569 if (i != argc - 1)
570 die("--stdin must be at the end");
571 read_from_stdin = 1;
572 break;
573 }
574 if (!strcmp(path, "--index-info")) {
575 allow_add = allow_replace = allow_remove = 1;
576 read_index_info(line_termination);
577 continue;
578 }
579 if (!strcmp(path, "--ignore-missing")) {
580 not_new = 1;
581 continue;
582 }
583 if (!strcmp(path, "--verbose")) {
584 verbose = 1;
585 continue;
586 }
587 if (!strcmp(path, "-h") || !strcmp(path, "--help"))
588 usage(update_index_usage);
589 die("unknown option %s", path);
590 }
591 update_one(path, prefix, prefix_length);
592 }
593 if (read_from_stdin) {
594 struct strbuf buf;
595 strbuf_init(&buf);
596 while (1) {
597 char *path_name;
598 read_line(&buf, stdin, line_termination);
599 if (buf.eof)
600 break;
601 if (line_termination && buf.buf[0] == '"')
602 path_name = unquote_c_style(buf.buf, NULL);
603 else
604 path_name = buf.buf;
605 update_one(path_name, prefix, prefix_length);
606 if (path_name != buf.buf)
607 free(path_name);
608 }
609 }
610 if (active_cache_changed) {
611 if (write_cache(newfd, active_cache, active_nr) ||
612 commit_index_file(&cache_file))
613 die("Unable to write new cachefile");
614 }
615 return has_errors ? 1 : 0;
617}