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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 | ||
10 | /* | |
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 | */ | |
17 | static int allow_add; | |
18 | static int allow_remove; | |
19 | static int allow_replace; | |
20 | static int allow_unmerged; /* --refresh needing merge is not error */ | |
21 | static int not_new; /* --refresh not having working tree files is not error */ | |
22 | static int quiet; /* --refresh needing update is not error */ | |
23 | static int info_only; | |
24 | static int force_remove; | |
25 | static int verbose; | |
26 | ||
27 | /* Three functions to allow overloaded pointer return; see linux/err.h */ | |
28 | static inline void *ERR_PTR(long error) | |
29 | { | |
30 | return (void *) error; | |
31 | } | |
32 | ||
33 | static inline long PTR_ERR(const void *ptr) | |
34 | { | |
35 | return (long) ptr; | |
36 | } | |
37 | ||
38 | static inline long IS_ERR(const void *ptr) | |
39 | { | |
40 | return (unsigned long)ptr > (unsigned long)-1000L; | |
41 | } | |
42 | ||
43 | static void report(const char *fmt, ...) | |
44 | { | |
45 | va_list vp; | |
46 | ||
47 | if (!verbose) | |
48 | return; | |
49 | ||
50 | va_start(vp, fmt); | |
51 | vprintf(fmt, vp); | |
52 | putchar('\n'); | |
53 | va_end(vp); | |
54 | } | |
55 | ||
56 | static int add_file_to_cache(const char *path) | |
57 | { | |
58 | int size, namelen, option, status; | |
59 | struct cache_entry *ce; | |
60 | struct stat st; | |
61 | ||
62 | status = lstat(path, &st); | |
63 | if (status < 0 || S_ISDIR(st.st_mode)) { | |
64 | /* When we used to have "path" and now we want to add | |
65 | * "path/file", we need a way to remove "path" before | |
66 | * being able to add "path/file". However, | |
67 | * "git-update-index --remove path" would not work. | |
68 | * --force-remove can be used but this is more user | |
69 | * friendly, especially since we can do the opposite | |
70 | * case just fine without --force-remove. | |
71 | */ | |
72 | if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) { | |
73 | if (allow_remove) { | |
74 | if (remove_file_from_cache(path)) | |
75 | return error("%s: cannot remove from the index", | |
76 | path); | |
77 | else | |
78 | return 0; | |
79 | } else if (status < 0) { | |
80 | return error("%s: does not exist and --remove not passed", | |
81 | path); | |
82 | } | |
83 | } | |
84 | if (0 == status) | |
85 | return error("%s: is a directory - add files inside instead", | |
86 | path); | |
87 | else | |
88 | return error("lstat(\"%s\"): %s", path, | |
89 | strerror(errno)); | |
90 | } | |
91 | ||
92 | namelen = strlen(path); | |
93 | size = cache_entry_size(namelen); | |
94 | ce = xmalloc(size); | |
95 | memset(ce, 0, size); | |
96 | memcpy(ce->name, path, namelen); | |
97 | fill_stat_cache_info(ce, &st); | |
98 | ||
99 | ce->ce_mode = create_ce_mode(st.st_mode); | |
100 | if (!trust_executable_bit) { | |
101 | /* If there is an existing entry, pick the mode bits | |
102 | * from it. | |
103 | */ | |
104 | int pos = cache_name_pos(path, namelen); | |
105 | if (0 <= pos) | |
106 | ce->ce_mode = active_cache[pos]->ce_mode; | |
107 | } | |
108 | ce->ce_flags = htons(namelen); | |
109 | ||
110 | if (index_path(ce->sha1, path, &st, !info_only)) | |
111 | return -1; | |
112 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; | |
113 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
114 | if (add_cache_entry(ce, option)) | |
115 | return error("%s: cannot add to the index - missing --add option?", | |
116 | path); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* | |
121 | * "refresh" does not calculate a new sha1 file or bring the | |
122 | * cache up-to-date for mode/content changes. But what it | |
123 | * _does_ do is to "re-match" the stat information of a file | |
124 | * with the cache, so that you can refresh the cache for a | |
125 | * file that hasn't been changed but where the stat entry is | |
126 | * out of date. | |
127 | * | |
128 | * For example, you'd want to do this after doing a "git-read-tree", | |
129 | * to link up the stat cache details with the proper files. | |
130 | */ | |
131 | static struct cache_entry *refresh_entry(struct cache_entry *ce) | |
132 | { | |
133 | struct stat st; | |
134 | struct cache_entry *updated; | |
135 | int changed, size; | |
136 | ||
137 | if (lstat(ce->name, &st) < 0) | |
138 | return ERR_PTR(-errno); | |
139 | ||
140 | changed = ce_match_stat(ce, &st); | |
141 | if (!changed) | |
142 | return NULL; | |
143 | ||
144 | if (ce_modified(ce, &st)) | |
145 | return ERR_PTR(-EINVAL); | |
146 | ||
147 | size = ce_size(ce); | |
148 | updated = xmalloc(size); | |
149 | memcpy(updated, ce, size); | |
150 | fill_stat_cache_info(updated, &st); | |
151 | return updated; | |
152 | } | |
153 | ||
154 | static int refresh_cache(void) | |
155 | { | |
156 | int i; | |
157 | int has_errors = 0; | |
158 | ||
159 | for (i = 0; i < active_nr; i++) { | |
160 | struct cache_entry *ce, *new; | |
161 | ce = active_cache[i]; | |
162 | if (ce_stage(ce)) { | |
163 | while ((i < active_nr) && | |
164 | ! strcmp(active_cache[i]->name, ce->name)) | |
165 | i++; | |
166 | i--; | |
167 | if (allow_unmerged) | |
168 | continue; | |
169 | printf("%s: needs merge\n", ce->name); | |
170 | has_errors = 1; | |
171 | continue; | |
172 | } | |
173 | ||
174 | new = refresh_entry(ce); | |
175 | if (!new) | |
176 | continue; | |
177 | if (IS_ERR(new)) { | |
178 | if (not_new && PTR_ERR(new) == -ENOENT) | |
179 | continue; | |
180 | if (quiet) | |
181 | continue; | |
182 | printf("%s: needs update\n", ce->name); | |
183 | has_errors = 1; | |
184 | continue; | |
185 | } | |
186 | active_cache_changed = 1; | |
187 | /* You can NOT just free active_cache[i] here, since it | |
188 | * might not be necessarily malloc()ed but can also come | |
189 | * from mmap(). */ | |
190 | active_cache[i] = new; | |
191 | } | |
192 | return has_errors; | |
193 | } | |
194 | ||
195 | /* | |
196 | * We fundamentally don't like some paths: we don't want | |
197 | * dot or dot-dot anywhere, and for obvious reasons don't | |
198 | * want to recurse into ".git" either. | |
199 | * | |
200 | * Also, we don't want double slashes or slashes at the | |
201 | * end that can make pathnames ambiguous. | |
202 | */ | |
203 | static int verify_dotfile(const char *rest) | |
204 | { | |
205 | /* | |
206 | * The first character was '.', but that | |
207 | * has already been discarded, we now test | |
208 | * the rest. | |
209 | */ | |
210 | switch (*rest) { | |
211 | /* "." is not allowed */ | |
212 | case '\0': case '/': | |
213 | return 0; | |
214 | ||
215 | /* | |
216 | * ".git" followed by NUL or slash is bad. This | |
217 | * shares the path end test with the ".." case. | |
218 | */ | |
219 | case 'g': | |
220 | if (rest[1] != 'i') | |
221 | break; | |
222 | if (rest[2] != 't') | |
223 | break; | |
224 | rest += 2; | |
225 | /* fallthrough */ | |
226 | case '.': | |
227 | if (rest[1] == '\0' || rest[1] == '/') | |
228 | return 0; | |
229 | } | |
230 | return 1; | |
231 | } | |
232 | ||
233 | static int verify_path(const char *path) | |
234 | { | |
235 | char c; | |
236 | ||
237 | goto inside; | |
238 | for (;;) { | |
239 | if (!c) | |
240 | return 1; | |
241 | if (c == '/') { | |
242 | inside: | |
243 | c = *path++; | |
244 | switch (c) { | |
245 | default: | |
246 | continue; | |
247 | case '/': case '\0': | |
248 | break; | |
249 | case '.': | |
250 | if (verify_dotfile(path)) | |
251 | continue; | |
252 | } | |
253 | return 0; | |
254 | } | |
255 | c = *path++; | |
256 | } | |
257 | } | |
258 | ||
259 | static int add_cacheinfo(unsigned int mode, const unsigned char *sha1, | |
260 | const char *path, int stage) | |
261 | { | |
262 | int size, len, option; | |
263 | struct cache_entry *ce; | |
264 | ||
265 | if (!verify_path(path)) | |
266 | return -1; | |
267 | ||
268 | len = strlen(path); | |
269 | size = cache_entry_size(len); | |
270 | ce = xmalloc(size); | |
271 | memset(ce, 0, size); | |
272 | ||
273 | memcpy(ce->sha1, sha1, 20); | |
274 | memcpy(ce->name, path, len); | |
275 | ce->ce_flags = create_ce_flags(len, stage); | |
276 | ce->ce_mode = create_ce_mode(mode); | |
277 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; | |
278 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
279 | if (add_cache_entry(ce, option)) | |
280 | return error("%s: cannot add to the index - missing --add option?", | |
281 | path); | |
282 | report("add '%s'", path); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int chmod_path(int flip, const char *path) | |
287 | { | |
288 | int pos; | |
289 | struct cache_entry *ce; | |
290 | unsigned int mode; | |
291 | ||
292 | pos = cache_name_pos(path, strlen(path)); | |
293 | if (pos < 0) | |
294 | return -1; | |
295 | ce = active_cache[pos]; | |
296 | mode = ntohl(ce->ce_mode); | |
297 | if (!S_ISREG(mode)) | |
298 | return -1; | |
299 | switch (flip) { | |
300 | case '+': | |
301 | ce->ce_mode |= htonl(0111); break; | |
302 | case '-': | |
303 | ce->ce_mode &= htonl(~0111); break; | |
304 | default: | |
305 | return -1; | |
306 | } | |
307 | active_cache_changed = 1; | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static struct cache_file cache_file; | |
312 | ||
313 | static void update_one(const char *path, const char *prefix, int prefix_length) | |
314 | { | |
315 | const char *p = prefix_path(prefix, prefix_length, path); | |
316 | if (!verify_path(p)) { | |
317 | fprintf(stderr, "Ignoring path %s\n", path); | |
318 | return; | |
319 | } | |
320 | if (force_remove) { | |
321 | if (remove_file_from_cache(p)) | |
322 | die("git-update-index: unable to remove %s", path); | |
323 | report("remove '%s'", path); | |
324 | return; | |
325 | } | |
326 | if (add_file_to_cache(p)) | |
327 | die("Unable to process file %s", path); | |
328 | report("add '%s'", path); | |
329 | } | |
330 | ||
331 | static void read_index_info(int line_termination) | |
332 | { | |
333 | struct strbuf buf; | |
334 | strbuf_init(&buf); | |
335 | while (1) { | |
336 | char *ptr, *tab; | |
337 | char *path_name; | |
338 | unsigned char sha1[20]; | |
339 | unsigned int mode; | |
340 | int stage; | |
341 | ||
342 | /* This reads lines formatted in one of three formats: | |
343 | * | |
344 | * (1) mode SP sha1 TAB path | |
345 | * The first format is what "git-apply --index-info" | |
346 | * reports, and used to reconstruct a partial tree | |
347 | * that is used for phony merge base tree when falling | |
348 | * back on 3-way merge. | |
349 | * | |
350 | * (2) mode SP type SP sha1 TAB path | |
351 | * The second format is to stuff git-ls-tree output | |
352 | * into the index file. | |
353 | * | |
354 | * (3) mode SP sha1 SP stage TAB path | |
355 | * This format is to put higher order stages into the | |
356 | * index file and matches git-ls-files --stage output. | |
357 | */ | |
358 | read_line(&buf, stdin, line_termination); | |
359 | if (buf.eof) | |
360 | break; | |
361 | ||
362 | mode = strtoul(buf.buf, &ptr, 8); | |
363 | if (ptr == buf.buf || *ptr != ' ') | |
364 | goto bad_line; | |
365 | ||
366 | tab = strchr(ptr, '\t'); | |
367 | if (!tab || tab - ptr < 41) | |
368 | goto bad_line; | |
369 | ||
370 | if (tab[-2] == ' ' && '1' <= tab[-1] && tab[-1] <= '3') { | |
371 | stage = tab[-1] - '0'; | |
372 | ptr = tab + 1; /* point at the head of path */ | |
373 | tab = tab - 2; /* point at tail of sha1 */ | |
374 | } | |
375 | else { | |
376 | stage = 0; | |
377 | ptr = tab + 1; /* point at the head of path */ | |
378 | } | |
379 | ||
380 | if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ') | |
381 | goto bad_line; | |
382 | ||
383 | if (line_termination && ptr[0] == '"') | |
384 | path_name = unquote_c_style(ptr, NULL); | |
385 | else | |
386 | path_name = ptr; | |
387 | ||
388 | if (!verify_path(path_name)) { | |
389 | fprintf(stderr, "Ignoring path %s\n", path_name); | |
390 | if (path_name != ptr) | |
391 | free(path_name); | |
392 | continue; | |
393 | } | |
394 | ||
395 | if (!mode) { | |
396 | /* mode == 0 means there is no such path -- remove */ | |
397 | if (remove_file_from_cache(path_name)) | |
398 | die("git-update-index: unable to remove %s", | |
399 | ptr); | |
400 | } | |
401 | else { | |
402 | /* mode ' ' sha1 '\t' name | |
403 | * ptr[-1] points at tab, | |
404 | * ptr[-41] is at the beginning of sha1 | |
405 | */ | |
406 | ptr[-42] = ptr[-1] = 0; | |
407 | if (add_cacheinfo(mode, sha1, path_name, stage)) | |
408 | die("git-update-index: unable to update %s", | |
409 | path_name); | |
410 | } | |
411 | if (path_name != ptr) | |
412 | free(path_name); | |
413 | continue; | |
414 | ||
415 | bad_line: | |
416 | die("malformed index info %s", buf.buf); | |
417 | } | |
418 | } | |
419 | ||
420 | static const char update_index_usage[] = | |
421 | "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>..."; | |
422 | ||
423 | int main(int argc, const char **argv) | |
424 | { | |
425 | int i, newfd, entries, has_errors = 0, line_termination = '\n'; | |
426 | int allow_options = 1; | |
427 | int read_from_stdin = 0; | |
428 | const char *prefix = setup_git_directory(); | |
429 | int prefix_length = prefix ? strlen(prefix) : 0; | |
430 | ||
431 | git_config(git_default_config); | |
432 | ||
433 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); | |
434 | if (newfd < 0) | |
435 | die("unable to create new cachefile"); | |
436 | ||
437 | entries = read_cache(); | |
438 | if (entries < 0) | |
439 | die("cache corrupted"); | |
440 | ||
441 | for (i = 1 ; i < argc; i++) { | |
442 | const char *path = argv[i]; | |
443 | ||
444 | if (allow_options && *path == '-') { | |
445 | if (!strcmp(path, "--")) { | |
446 | allow_options = 0; | |
447 | continue; | |
448 | } | |
449 | if (!strcmp(path, "-q")) { | |
450 | quiet = 1; | |
451 | continue; | |
452 | } | |
453 | if (!strcmp(path, "--add")) { | |
454 | allow_add = 1; | |
455 | continue; | |
456 | } | |
457 | if (!strcmp(path, "--replace")) { | |
458 | allow_replace = 1; | |
459 | continue; | |
460 | } | |
461 | if (!strcmp(path, "--remove")) { | |
462 | allow_remove = 1; | |
463 | continue; | |
464 | } | |
465 | if (!strcmp(path, "--unmerged")) { | |
466 | allow_unmerged = 1; | |
467 | continue; | |
468 | } | |
469 | if (!strcmp(path, "--refresh")) { | |
470 | has_errors |= refresh_cache(); | |
471 | continue; | |
472 | } | |
473 | if (!strcmp(path, "--cacheinfo")) { | |
474 | unsigned char sha1[20]; | |
475 | unsigned int mode; | |
476 | ||
477 | if (i+3 >= argc) | |
478 | die("git-update-index: --cacheinfo <mode> <sha1> <path>"); | |
479 | ||
480 | if ((sscanf(argv[i+1], "%o", &mode) != 1) || | |
481 | get_sha1_hex(argv[i+2], sha1) || | |
482 | add_cacheinfo(mode, sha1, argv[i+3], 0)) | |
483 | die("git-update-index: --cacheinfo" | |
484 | " cannot add %s", argv[i+3]); | |
485 | i += 3; | |
486 | continue; | |
487 | } | |
488 | if (!strcmp(path, "--chmod=-x") || | |
489 | !strcmp(path, "--chmod=+x")) { | |
490 | if (argc <= i+1) | |
491 | die("git-update-index: %s <path>", path); | |
492 | if (chmod_path(path[8], argv[++i])) | |
493 | die("git-update-index: %s cannot chmod %s", path, argv[i]); | |
494 | continue; | |
495 | } | |
496 | if (!strcmp(path, "--info-only")) { | |
497 | info_only = 1; | |
498 | continue; | |
499 | } | |
500 | if (!strcmp(path, "--force-remove")) { | |
501 | force_remove = 1; | |
502 | continue; | |
503 | } | |
504 | if (!strcmp(path, "-z")) { | |
505 | line_termination = 0; | |
506 | continue; | |
507 | } | |
508 | if (!strcmp(path, "--stdin")) { | |
509 | if (i != argc - 1) | |
510 | die("--stdin must be at the end"); | |
511 | read_from_stdin = 1; | |
512 | break; | |
513 | } | |
514 | if (!strcmp(path, "--index-info")) { | |
515 | allow_add = allow_replace = allow_remove = 1; | |
516 | read_index_info(line_termination); | |
517 | continue; | |
518 | } | |
519 | if (!strcmp(path, "--ignore-missing")) { | |
520 | not_new = 1; | |
521 | continue; | |
522 | } | |
523 | if (!strcmp(path, "--verbose")) { | |
524 | verbose = 1; | |
525 | continue; | |
526 | } | |
527 | if (!strcmp(path, "-h") || !strcmp(path, "--help")) | |
528 | usage(update_index_usage); | |
529 | die("unknown option %s", path); | |
530 | } | |
531 | update_one(path, prefix, prefix_length); | |
532 | } | |
533 | if (read_from_stdin) { | |
534 | struct strbuf buf; | |
535 | strbuf_init(&buf); | |
536 | while (1) { | |
537 | read_line(&buf, stdin, line_termination); | |
538 | if (buf.eof) | |
539 | break; | |
540 | update_one(buf.buf, prefix, prefix_length); | |
541 | } | |
542 | } | |
543 | if (active_cache_changed) { | |
544 | if (write_cache(newfd, active_cache, active_nr) || | |
545 | commit_index_file(&cache_file)) | |
546 | die("Unable to write new cachefile"); | |
547 | } | |
548 | ||
549 | return has_errors ? 1 : 0; | |
550 | } |