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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 | ||
9 | /* | |
10 | * Default to not allowing changes to the list of files. The | |
11 | * tool doesn't actually care, but this makes it harder to add | |
12 | * files to the revision control by mistake by doing something | |
13 | * like "git-update-index *" and suddenly having all the object | |
14 | * files be revision controlled. | |
15 | */ | |
16 | static int allow_add = 0, allow_remove = 0, allow_replace = 0, allow_unmerged = 0, not_new = 0, quiet = 0, info_only = 0; | |
17 | static int force_remove; | |
18 | ||
19 | /* Three functions to allow overloaded pointer return; see linux/err.h */ | |
20 | static inline void *ERR_PTR(long error) | |
21 | { | |
22 | return (void *) error; | |
23 | } | |
24 | ||
25 | static inline long PTR_ERR(const void *ptr) | |
26 | { | |
27 | return (long) ptr; | |
28 | } | |
29 | ||
30 | static inline long IS_ERR(const void *ptr) | |
31 | { | |
32 | return (unsigned long)ptr > (unsigned long)-1000L; | |
33 | } | |
34 | ||
35 | static int add_file_to_cache(const char *path) | |
36 | { | |
37 | int size, namelen, option, status; | |
38 | struct cache_entry *ce; | |
39 | struct stat st; | |
40 | ||
41 | status = lstat(path, &st); | |
42 | if (status < 0 || S_ISDIR(st.st_mode)) { | |
43 | /* When we used to have "path" and now we want to add | |
44 | * "path/file", we need a way to remove "path" before | |
45 | * being able to add "path/file". However, | |
46 | * "git-update-index --remove path" would not work. | |
47 | * --force-remove can be used but this is more user | |
48 | * friendly, especially since we can do the opposite | |
49 | * case just fine without --force-remove. | |
50 | */ | |
51 | if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) { | |
52 | if (allow_remove) { | |
53 | if (remove_file_from_cache(path)) | |
54 | return error("%s: cannot remove from the index", | |
55 | path); | |
56 | else | |
57 | return 0; | |
58 | } else if (status < 0) { | |
59 | return error("%s: does not exist and --remove not passed", | |
60 | path); | |
61 | } | |
62 | } | |
63 | if (0 == status) | |
64 | return error("%s: is a directory - add files inside instead", | |
65 | path); | |
66 | else | |
67 | return error("lstat(\"%s\"): %s", path, | |
68 | strerror(errno)); | |
69 | } | |
70 | ||
71 | namelen = strlen(path); | |
72 | size = cache_entry_size(namelen); | |
73 | ce = xmalloc(size); | |
74 | memset(ce, 0, size); | |
75 | memcpy(ce->name, path, namelen); | |
76 | fill_stat_cache_info(ce, &st); | |
77 | ||
78 | ce->ce_mode = create_ce_mode(st.st_mode); | |
79 | if (!trust_executable_bit) { | |
80 | /* If there is an existing entry, pick the mode bits | |
81 | * from it. | |
82 | */ | |
83 | int pos = cache_name_pos(path, namelen); | |
84 | if (0 <= pos) | |
85 | ce->ce_mode = active_cache[pos]->ce_mode; | |
86 | } | |
87 | ce->ce_flags = htons(namelen); | |
88 | ||
89 | if (index_path(ce->sha1, path, &st, !info_only)) | |
90 | return -1; | |
91 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; | |
92 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
93 | if (add_cache_entry(ce, option)) | |
94 | return error("%s: cannot add to the index - missing --add option?", | |
95 | path); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | /* | |
100 | * "refresh" does not calculate a new sha1 file or bring the | |
101 | * cache up-to-date for mode/content changes. But what it | |
102 | * _does_ do is to "re-match" the stat information of a file | |
103 | * with the cache, so that you can refresh the cache for a | |
104 | * file that hasn't been changed but where the stat entry is | |
105 | * out of date. | |
106 | * | |
107 | * For example, you'd want to do this after doing a "git-read-tree", | |
108 | * to link up the stat cache details with the proper files. | |
109 | */ | |
110 | static struct cache_entry *refresh_entry(struct cache_entry *ce) | |
111 | { | |
112 | struct stat st; | |
113 | struct cache_entry *updated; | |
114 | int changed, size; | |
115 | ||
116 | if (lstat(ce->name, &st) < 0) | |
117 | return ERR_PTR(-errno); | |
118 | ||
119 | changed = ce_match_stat(ce, &st); | |
120 | if (!changed) | |
121 | return NULL; | |
122 | ||
123 | if (ce_modified(ce, &st)) | |
124 | return ERR_PTR(-EINVAL); | |
125 | ||
126 | size = ce_size(ce); | |
127 | updated = xmalloc(size); | |
128 | memcpy(updated, ce, size); | |
129 | fill_stat_cache_info(updated, &st); | |
130 | return updated; | |
131 | } | |
132 | ||
133 | static int refresh_cache(void) | |
134 | { | |
135 | int i; | |
136 | int has_errors = 0; | |
137 | ||
138 | for (i = 0; i < active_nr; i++) { | |
139 | struct cache_entry *ce, *new; | |
140 | ce = active_cache[i]; | |
141 | if (ce_stage(ce)) { | |
142 | while ((i < active_nr) && | |
143 | ! strcmp(active_cache[i]->name, ce->name)) | |
144 | i++; | |
145 | i--; | |
146 | if (allow_unmerged) | |
147 | continue; | |
148 | printf("%s: needs merge\n", ce->name); | |
149 | has_errors = 1; | |
150 | continue; | |
151 | } | |
152 | ||
153 | new = refresh_entry(ce); | |
154 | if (!new) | |
155 | continue; | |
156 | if (IS_ERR(new)) { | |
157 | if (not_new && PTR_ERR(new) == -ENOENT) | |
158 | continue; | |
159 | if (quiet) | |
160 | continue; | |
161 | printf("%s: needs update\n", ce->name); | |
162 | has_errors = 1; | |
163 | continue; | |
164 | } | |
165 | active_cache_changed = 1; | |
166 | /* You can NOT just free active_cache[i] here, since it | |
167 | * might not be necessarily malloc()ed but can also come | |
168 | * from mmap(). */ | |
169 | active_cache[i] = new; | |
170 | } | |
171 | return has_errors; | |
172 | } | |
173 | ||
174 | /* | |
175 | * We fundamentally don't like some paths: we don't want | |
176 | * dot or dot-dot anywhere, and for obvious reasons don't | |
177 | * want to recurse into ".git" either. | |
178 | * | |
179 | * Also, we don't want double slashes or slashes at the | |
180 | * end that can make pathnames ambiguous. | |
181 | */ | |
182 | static int verify_dotfile(const char *rest) | |
183 | { | |
184 | /* | |
185 | * The first character was '.', but that | |
186 | * has already been discarded, we now test | |
187 | * the rest. | |
188 | */ | |
189 | switch (*rest) { | |
190 | /* "." is not allowed */ | |
191 | case '\0': case '/': | |
192 | return 0; | |
193 | ||
194 | /* | |
195 | * ".git" followed by NUL or slash is bad. This | |
196 | * shares the path end test with the ".." case. | |
197 | */ | |
198 | case 'g': | |
199 | if (rest[1] != 'i') | |
200 | break; | |
201 | if (rest[2] != 't') | |
202 | break; | |
203 | rest += 2; | |
204 | /* fallthrough */ | |
205 | case '.': | |
206 | if (rest[1] == '\0' || rest[1] == '/') | |
207 | return 0; | |
208 | } | |
209 | return 1; | |
210 | } | |
211 | ||
212 | static int verify_path(const char *path) | |
213 | { | |
214 | char c; | |
215 | ||
216 | goto inside; | |
217 | for (;;) { | |
218 | if (!c) | |
219 | return 1; | |
220 | if (c == '/') { | |
221 | inside: | |
222 | c = *path++; | |
223 | switch (c) { | |
224 | default: | |
225 | continue; | |
226 | case '/': case '\0': | |
227 | break; | |
228 | case '.': | |
229 | if (verify_dotfile(path)) | |
230 | continue; | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | c = *path++; | |
235 | } | |
236 | } | |
237 | ||
238 | static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3) | |
239 | { | |
240 | int size, len, option; | |
241 | unsigned int mode; | |
242 | unsigned char sha1[20]; | |
243 | struct cache_entry *ce; | |
244 | ||
245 | if (sscanf(arg1, "%o", &mode) != 1) | |
246 | return -1; | |
247 | if (get_sha1_hex(arg2, sha1)) | |
248 | return -1; | |
249 | if (!verify_path(arg3)) | |
250 | return -1; | |
251 | ||
252 | len = strlen(arg3); | |
253 | size = cache_entry_size(len); | |
254 | ce = xmalloc(size); | |
255 | memset(ce, 0, size); | |
256 | ||
257 | memcpy(ce->sha1, sha1, 20); | |
258 | memcpy(ce->name, arg3, len); | |
259 | ce->ce_flags = htons(len); | |
260 | ce->ce_mode = create_ce_mode(mode); | |
261 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; | |
262 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
263 | return add_cache_entry(ce, option); | |
264 | } | |
265 | ||
266 | static int chmod_path(int flip, const char *path) | |
267 | { | |
268 | int pos; | |
269 | struct cache_entry *ce; | |
270 | unsigned int mode; | |
271 | ||
272 | pos = cache_name_pos(path, strlen(path)); | |
273 | if (pos < 0) | |
274 | return -1; | |
275 | ce = active_cache[pos]; | |
276 | mode = ntohl(ce->ce_mode); | |
277 | if (!S_ISREG(mode)) | |
278 | return -1; | |
279 | switch (flip) { | |
280 | case '+': | |
281 | ce->ce_mode |= htonl(0111); break; | |
282 | case '-': | |
283 | ce->ce_mode &= htonl(~0111); break; | |
284 | default: | |
285 | return -1; | |
286 | } | |
287 | active_cache_changed = 1; | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static struct cache_file cache_file; | |
292 | ||
293 | static void update_one(const char *path, const char *prefix, int prefix_length) | |
294 | { | |
295 | const char *p = prefix_path(prefix, prefix_length, path); | |
296 | if (!verify_path(p)) { | |
297 | fprintf(stderr, "Ignoring path %s\n", path); | |
298 | return; | |
299 | } | |
300 | if (force_remove) { | |
301 | if (remove_file_from_cache(p)) | |
302 | die("git-update-index: unable to remove %s", path); | |
303 | return; | |
304 | } | |
305 | if (add_file_to_cache(p)) | |
306 | die("Unable to process file %s", path); | |
307 | } | |
308 | ||
309 | static void read_index_info(int line_termination) | |
310 | { | |
311 | struct strbuf buf; | |
312 | strbuf_init(&buf); | |
313 | while (1) { | |
314 | char *ptr; | |
315 | unsigned char sha1[20]; | |
316 | unsigned int mode; | |
317 | ||
318 | read_line(&buf, stdin, line_termination); | |
319 | if (buf.eof) | |
320 | break; | |
321 | ||
322 | mode = strtoul(buf.buf, &ptr, 8); | |
323 | if (ptr == buf.buf || *ptr != ' ' || | |
324 | get_sha1_hex(ptr + 1, sha1) || | |
325 | ptr[41] != '\t') | |
326 | goto bad_line; | |
327 | ||
328 | ptr += 42; | |
329 | if (!verify_path(ptr)) { | |
330 | fprintf(stderr, "Ignoring path %s\n", ptr); | |
331 | continue; | |
332 | } | |
333 | ||
334 | if (!mode) { | |
335 | /* mode == 0 means there is no such path -- remove */ | |
336 | if (remove_file_from_cache(ptr)) | |
337 | die("git-update-index: unable to remove %s", | |
338 | ptr); | |
339 | } | |
340 | else { | |
341 | /* mode ' ' sha1 '\t' name | |
342 | * ptr[-1] points at tab, | |
343 | * ptr[-41] is at the beginning of sha1 | |
344 | */ | |
345 | ptr[-42] = ptr[-1] = 0; | |
346 | if (add_cacheinfo(buf.buf, ptr-41, ptr)) | |
347 | die("git-update-index: unable to update %s", | |
348 | ptr); | |
349 | } | |
350 | continue; | |
351 | ||
352 | bad_line: | |
353 | die("malformed index info %s", buf.buf); | |
354 | } | |
355 | } | |
356 | ||
357 | int main(int argc, const char **argv) | |
358 | { | |
359 | int i, newfd, entries, has_errors = 0, line_termination = '\n'; | |
360 | int allow_options = 1; | |
361 | int read_from_stdin = 0; | |
362 | const char *prefix = setup_git_directory(); | |
363 | int prefix_length = prefix ? strlen(prefix) : 0; | |
364 | ||
365 | git_config(git_default_config); | |
366 | ||
367 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); | |
368 | if (newfd < 0) | |
369 | die("unable to create new cachefile"); | |
370 | ||
371 | entries = read_cache(); | |
372 | if (entries < 0) | |
373 | die("cache corrupted"); | |
374 | ||
375 | for (i = 1 ; i < argc; i++) { | |
376 | const char *path = argv[i]; | |
377 | ||
378 | if (allow_options && *path == '-') { | |
379 | if (!strcmp(path, "--")) { | |
380 | allow_options = 0; | |
381 | continue; | |
382 | } | |
383 | if (!strcmp(path, "-q")) { | |
384 | quiet = 1; | |
385 | continue; | |
386 | } | |
387 | if (!strcmp(path, "--add")) { | |
388 | allow_add = 1; | |
389 | continue; | |
390 | } | |
391 | if (!strcmp(path, "--replace")) { | |
392 | allow_replace = 1; | |
393 | continue; | |
394 | } | |
395 | if (!strcmp(path, "--remove")) { | |
396 | allow_remove = 1; | |
397 | continue; | |
398 | } | |
399 | if (!strcmp(path, "--unmerged")) { | |
400 | allow_unmerged = 1; | |
401 | continue; | |
402 | } | |
403 | if (!strcmp(path, "--refresh")) { | |
404 | has_errors |= refresh_cache(); | |
405 | continue; | |
406 | } | |
407 | if (!strcmp(path, "--cacheinfo")) { | |
408 | if (i+3 >= argc) | |
409 | die("git-update-index: --cacheinfo <mode> <sha1> <path>"); | |
410 | if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) | |
411 | die("git-update-index: --cacheinfo cannot add %s", argv[i+3]); | |
412 | i += 3; | |
413 | continue; | |
414 | } | |
415 | if (!strcmp(path, "--chmod=-x") || | |
416 | !strcmp(path, "--chmod=+x")) { | |
417 | if (argc <= i+1) | |
418 | die("git-update-index: %s <path>", path); | |
419 | if (chmod_path(path[8], argv[++i])) | |
420 | die("git-update-index: %s cannot chmod %s", path, argv[i]); | |
421 | continue; | |
422 | } | |
423 | if (!strcmp(path, "--info-only")) { | |
424 | info_only = 1; | |
425 | continue; | |
426 | } | |
427 | if (!strcmp(path, "--force-remove")) { | |
428 | force_remove = 1; | |
429 | continue; | |
430 | } | |
431 | if (!strcmp(path, "-z")) { | |
432 | line_termination = 0; | |
433 | continue; | |
434 | } | |
435 | if (!strcmp(path, "--stdin")) { | |
436 | if (i != argc - 1) | |
437 | die("--stdin must be at the end"); | |
438 | read_from_stdin = 1; | |
439 | break; | |
440 | } | |
441 | if (!strcmp(path, "--index-info")) { | |
442 | allow_add = allow_replace = allow_remove = 1; | |
443 | read_index_info(line_termination); | |
444 | continue; | |
445 | } | |
446 | if (!strcmp(path, "--ignore-missing")) { | |
447 | not_new = 1; | |
448 | continue; | |
449 | } | |
450 | die("unknown option %s", path); | |
451 | } | |
452 | update_one(path, prefix, prefix_length); | |
453 | } | |
454 | if (read_from_stdin) { | |
455 | struct strbuf buf; | |
456 | strbuf_init(&buf); | |
457 | while (1) { | |
458 | read_line(&buf, stdin, line_termination); | |
459 | if (buf.eof) | |
460 | break; | |
461 | update_one(buf.buf, prefix, prefix_length); | |
462 | } | |
463 | } | |
464 | if (active_cache_changed) { | |
465 | if (write_cache(newfd, active_cache, active_nr) || | |
466 | commit_index_file(&cache_file)) | |
467 | die("Unable to write new cachefile"); | |
468 | } | |
469 | ||
470 | return has_errors ? 1 : 0; | |
471 | } |