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Commit | Line | Data |
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8bc9a0c7 LT |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | */ | |
e83c5163 LT |
6 | #include "cache.h" |
7 | ||
121481ab LT |
8 | /* |
9 | * Default to not allowing changes to the list of files. The | |
10 | * tool doesn't actually care, but this makes it harder to add | |
11 | * files to the revision control by mistake by doing something | |
215a7ad1 | 12 | * like "git-update-index *" and suddenly having all the object |
121481ab LT |
13 | * files be revision controlled. |
14 | */ | |
df6e1516 | 15 | static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0; |
9b63f501 | 16 | static int force_remove; |
c6e007b0 JB |
17 | |
18 | /* Three functions to allow overloaded pointer return; see linux/err.h */ | |
19 | static inline void *ERR_PTR(long error) | |
20 | { | |
21 | return (void *) error; | |
22 | } | |
23 | ||
24 | static inline long PTR_ERR(const void *ptr) | |
25 | { | |
26 | return (long) ptr; | |
27 | } | |
28 | ||
29 | static inline long IS_ERR(const void *ptr) | |
30 | { | |
31 | return (unsigned long)ptr > (unsigned long)-1000L; | |
32 | } | |
121481ab | 33 | |
ee267527 | 34 | static int add_file_to_cache(char *path) |
e83c5163 | 35 | { |
4c5abf42 | 36 | int size, namelen, option, status; |
e83c5163 LT |
37 | struct cache_entry *ce; |
38 | struct stat st; | |
39 | int fd; | |
ffbe1add | 40 | char *target; |
e83c5163 | 41 | |
4c5abf42 JH |
42 | status = lstat(path, &st); |
43 | if (status < 0 || S_ISDIR(st.st_mode)) { | |
44 | /* When we used to have "path" and now we want to add | |
45 | * "path/file", we need a way to remove "path" before | |
46 | * being able to add "path/file". However, | |
215a7ad1 | 47 | * "git-update-index --remove path" would not work. |
4c5abf42 JH |
48 | * --force-remove can be used but this is more user |
49 | * friendly, especially since we can do the opposite | |
50 | * case just fine without --force-remove. | |
51 | */ | |
52 | if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) { | |
34143b26 PB |
53 | if (allow_remove) { |
54 | if (remove_file_from_cache(path)) | |
55 | return error("%s: cannot remove from the index", | |
56 | path); | |
57 | else | |
58 | return 0; | |
59 | } else if (status < 0) { | |
60 | return error("%s: does not exist and --remove not passed", | |
61 | path); | |
62 | } | |
121481ab | 63 | } |
89bc8c78 | 64 | if (0 == status) |
34143b26 PB |
65 | return error("%s: is a directory - add files inside instead", |
66 | path); | |
89bc8c78 AW |
67 | else |
68 | return error("lstat(\"%s\"): %s", path, | |
69 | strerror(errno)); | |
e83c5163 | 70 | } |
e83c5163 LT |
71 | namelen = strlen(path); |
72 | size = cache_entry_size(namelen); | |
812666c8 | 73 | ce = xmalloc(size); |
e83c5163 LT |
74 | memset(ce, 0, size); |
75 | memcpy(ce->name, path, namelen); | |
711cf3a0 | 76 | fill_stat_cache_info(ce, &st); |
e4479470 | 77 | ce->ce_mode = create_ce_mode(st.st_mode); |
f5cabd13 | 78 | ce->ce_flags = htons(namelen); |
8ae0a8c5 KS |
79 | switch (st.st_mode & S_IFMT) { |
80 | case S_IFREG: | |
81 | fd = open(path, O_RDONLY); | |
82 | if (fd < 0) | |
34143b26 | 83 | return error("open(\"%s\"): %s", path, strerror(errno)); |
df6e1516 | 84 | if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0) |
34143b26 | 85 | return error("%s: failed to insert into database", path); |
8ae0a8c5 KS |
86 | break; |
87 | case S_IFLNK: | |
ffbe1add KS |
88 | target = xmalloc(st.st_size+1); |
89 | if (readlink(path, target, st.st_size+1) != st.st_size) { | |
34143b26 | 90 | char *errstr = strerror(errno); |
ffbe1add | 91 | free(target); |
34143b26 PB |
92 | return error("readlink(\"%s\"): %s", path, |
93 | errstr); | |
ffbe1add | 94 | } |
df6e1516 BL |
95 | if (info_only) { |
96 | unsigned char hdr[50]; | |
97 | int hdrlen; | |
98 | write_sha1_file_prepare(target, st.st_size, "blob", | |
99 | ce->sha1, hdr, &hdrlen); | |
100 | } else if (write_sha1_file(target, st.st_size, "blob", ce->sha1)) | |
34143b26 | 101 | return error("%s: failed to insert into database", path); |
ffbe1add | 102 | free(target); |
8ae0a8c5 KS |
103 | break; |
104 | default: | |
34143b26 | 105 | return error("%s: unsupported file type", path); |
8ae0a8c5 | 106 | } |
192268c1 JH |
107 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
108 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
34143b26 PB |
109 | if (add_cache_entry(ce, option)) |
110 | return error("%s: cannot add to the index - missing --add option?", | |
111 | path); | |
112 | return 0; | |
121481ab LT |
113 | } |
114 | ||
69a97f1d | 115 | static int compare_data(struct cache_entry *ce, struct stat *st) |
121481ab | 116 | { |
711cf3a0 LT |
117 | int match = -1; |
118 | int fd = open(ce->name, O_RDONLY); | |
119 | ||
120 | if (fd >= 0) { | |
69a97f1d BL |
121 | unsigned char sha1[20]; |
122 | if (!index_fd(sha1, fd, st, 0, NULL)) | |
123 | match = memcmp(sha1, ce->sha1, 20); | |
711cf3a0 LT |
124 | close(fd); |
125 | } | |
126 | return match; | |
127 | } | |
128 | ||
ffbe1add KS |
129 | static int compare_link(struct cache_entry *ce, unsigned long expected_size) |
130 | { | |
131 | int match = -1; | |
132 | char *target; | |
133 | void *buffer; | |
134 | unsigned long size; | |
135 | char type[10]; | |
136 | int len; | |
137 | ||
138 | target = xmalloc(expected_size); | |
139 | len = readlink(ce->name, target, expected_size); | |
140 | if (len != expected_size) { | |
141 | free(target); | |
142 | return -1; | |
143 | } | |
144 | buffer = read_sha1_file(ce->sha1, type, &size); | |
145 | if (!buffer) { | |
146 | free(target); | |
147 | return -1; | |
148 | } | |
149 | if (size == expected_size) | |
150 | match = memcmp(buffer, target, size); | |
151 | free(buffer); | |
152 | free(target); | |
153 | return match; | |
154 | } | |
155 | ||
711cf3a0 LT |
156 | /* |
157 | * "refresh" does not calculate a new sha1 file or bring the | |
158 | * cache up-to-date for mode/content changes. But what it | |
159 | * _does_ do is to "re-match" the stat information of a file | |
160 | * with the cache, so that you can refresh the cache for a | |
161 | * file that hasn't been changed but where the stat entry is | |
162 | * out of date. | |
163 | * | |
667bb59b | 164 | * For example, you'd want to do this after doing a "git-read-tree", |
711cf3a0 LT |
165 | * to link up the stat cache details with the proper files. |
166 | */ | |
167 | static struct cache_entry *refresh_entry(struct cache_entry *ce) | |
168 | { | |
169 | struct stat st; | |
170 | struct cache_entry *updated; | |
171 | int changed, size; | |
172 | ||
8ae0a8c5 | 173 | if (lstat(ce->name, &st) < 0) |
c6e007b0 | 174 | return ERR_PTR(-errno); |
711cf3a0 | 175 | |
5d728c84 | 176 | changed = ce_match_stat(ce, &st); |
711cf3a0 LT |
177 | if (!changed) |
178 | return ce; | |
179 | ||
121481ab | 180 | /* |
8ae0a8c5 | 181 | * If the mode or type has changed, there's no point in trying |
711cf3a0 | 182 | * to refresh the entry - it's not going to match |
121481ab | 183 | */ |
8ae0a8c5 | 184 | if (changed & (MODE_CHANGED | TYPE_CHANGED)) |
c6e007b0 | 185 | return ERR_PTR(-EINVAL); |
711cf3a0 | 186 | |
ffbe1add KS |
187 | switch (st.st_mode & S_IFMT) { |
188 | case S_IFREG: | |
69a97f1d | 189 | if (compare_data(ce, &st)) |
ffbe1add KS |
190 | return ERR_PTR(-EINVAL); |
191 | break; | |
192 | case S_IFLNK: | |
193 | if (compare_link(ce, st.st_size)) | |
194 | return ERR_PTR(-EINVAL); | |
195 | break; | |
196 | default: | |
c6e007b0 | 197 | return ERR_PTR(-EINVAL); |
ffbe1add | 198 | } |
711cf3a0 LT |
199 | |
200 | size = ce_size(ce); | |
812666c8 | 201 | updated = xmalloc(size); |
711cf3a0 LT |
202 | memcpy(updated, ce, size); |
203 | fill_stat_cache_info(updated, &st); | |
204 | return updated; | |
121481ab LT |
205 | } |
206 | ||
90535218 | 207 | static int refresh_cache(void) |
121481ab LT |
208 | { |
209 | int i; | |
90535218 | 210 | int has_errors = 0; |
121481ab | 211 | |
711cf3a0 | 212 | for (i = 0; i < active_nr; i++) { |
1bc992ac JH |
213 | struct cache_entry *ce, *new; |
214 | ce = active_cache[i]; | |
215 | if (ce_stage(ce)) { | |
216 | printf("%s: needs merge\n", ce->name); | |
90535218 | 217 | has_errors = 1; |
1bc992ac JH |
218 | while ((i < active_nr) && |
219 | ! strcmp(active_cache[i]->name, ce->name)) | |
220 | i++; | |
221 | i--; | |
222 | continue; | |
223 | } | |
711cf3a0 | 224 | |
1bc992ac | 225 | new = refresh_entry(ce); |
c6e007b0 | 226 | if (IS_ERR(new)) { |
0ed3715f LT |
227 | if (not_new && PTR_ERR(new) == -ENOENT) |
228 | continue; | |
229 | if (quiet) | |
230 | continue; | |
231 | printf("%s: needs update\n", ce->name); | |
232 | has_errors = 1; | |
711cf3a0 LT |
233 | continue; |
234 | } | |
ee267527 | 235 | active_cache_changed = 1; |
62d046a0 PB |
236 | /* You can NOT just free active_cache[i] here, since it |
237 | * might not be necessarily malloc()ed but can also come | |
238 | * from mmap(). */ | |
711cf3a0 LT |
239 | active_cache[i] = new; |
240 | } | |
90535218 | 241 | return has_errors; |
e83c5163 LT |
242 | } |
243 | ||
e83c5163 LT |
244 | /* |
245 | * We fundamentally don't like some paths: we don't want | |
320d3a1b LT |
246 | * dot or dot-dot anywhere, and for obvious reasons don't |
247 | * want to recurse into ".git" either. | |
e83c5163 LT |
248 | * |
249 | * Also, we don't want double slashes or slashes at the | |
aebb2679 | 250 | * end that can make pathnames ambiguous. |
e83c5163 | 251 | */ |
320d3a1b LT |
252 | static int verify_dotfile(const char *rest) |
253 | { | |
254 | /* | |
255 | * The first character was '.', but that | |
256 | * has already been discarded, we now test | |
257 | * the rest. | |
258 | */ | |
259 | switch (*rest) { | |
260 | /* "." is not allowed */ | |
261 | case '\0': case '/': | |
262 | return 0; | |
263 | ||
264 | /* | |
265 | * ".git" followed by NUL or slash is bad. This | |
266 | * shares the path end test with the ".." case. | |
267 | */ | |
268 | case 'g': | |
269 | if (rest[1] != 'i') | |
270 | break; | |
271 | if (rest[2] != 't') | |
272 | break; | |
273 | rest += 2; | |
274 | /* fallthrough */ | |
275 | case '.': | |
276 | if (rest[1] == '\0' || rest[1] == '/') | |
277 | return 0; | |
278 | } | |
279 | return 1; | |
280 | } | |
281 | ||
e83c5163 LT |
282 | static int verify_path(char *path) |
283 | { | |
284 | char c; | |
285 | ||
286 | goto inside; | |
287 | for (;;) { | |
288 | if (!c) | |
289 | return 1; | |
290 | if (c == '/') { | |
291 | inside: | |
292 | c = *path++; | |
320d3a1b LT |
293 | switch (c) { |
294 | default: | |
e83c5163 | 295 | continue; |
320d3a1b LT |
296 | case '/': case '\0': |
297 | break; | |
298 | case '.': | |
299 | if (verify_dotfile(path)) | |
300 | continue; | |
301 | } | |
e83c5163 LT |
302 | return 0; |
303 | } | |
304 | c = *path++; | |
305 | } | |
306 | } | |
307 | ||
9945d980 LT |
308 | static int add_cacheinfo(char *arg1, char *arg2, char *arg3) |
309 | { | |
192268c1 | 310 | int size, len, option; |
9945d980 LT |
311 | unsigned int mode; |
312 | unsigned char sha1[20]; | |
313 | struct cache_entry *ce; | |
314 | ||
315 | if (sscanf(arg1, "%o", &mode) != 1) | |
316 | return -1; | |
9945d980 LT |
317 | if (get_sha1_hex(arg2, sha1)) |
318 | return -1; | |
9945d980 LT |
319 | if (!verify_path(arg3)) |
320 | return -1; | |
9945d980 LT |
321 | |
322 | len = strlen(arg3); | |
323 | size = cache_entry_size(len); | |
812666c8 | 324 | ce = xmalloc(size); |
9945d980 LT |
325 | memset(ce, 0, size); |
326 | ||
327 | memcpy(ce->sha1, sha1, 20); | |
328 | memcpy(ce->name, arg3, len); | |
f5cabd13 | 329 | ce->ce_flags = htons(len); |
e4479470 | 330 | ce->ce_mode = create_ce_mode(mode); |
192268c1 JH |
331 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
332 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
333 | return add_cache_entry(ce, option); | |
9945d980 LT |
334 | } |
335 | ||
e99d59ff | 336 | static struct cache_file cache_file; |
f2a19340 | 337 | |
e83c5163 LT |
338 | int main(int argc, char **argv) |
339 | { | |
90535218 | 340 | int i, newfd, entries, has_errors = 0; |
121481ab | 341 | int allow_options = 1; |
cfb0af1d | 342 | const char *prefix = setup_git_directory(); |
bb233d69 | 343 | |
415e96c8 | 344 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); |
9614b8dc | 345 | if (newfd < 0) |
2de381f9 | 346 | die("unable to create new cachefile"); |
9614b8dc | 347 | |
e83c5163 | 348 | entries = read_cache(); |
9614b8dc | 349 | if (entries < 0) |
2de381f9 | 350 | die("cache corrupted"); |
e83c5163 | 351 | |
e83c5163 LT |
352 | for (i = 1 ; i < argc; i++) { |
353 | char *path = argv[i]; | |
121481ab LT |
354 | |
355 | if (allow_options && *path == '-') { | |
356 | if (!strcmp(path, "--")) { | |
357 | allow_options = 0; | |
358 | continue; | |
359 | } | |
0ed3715f LT |
360 | if (!strcmp(path, "-q")) { |
361 | quiet = 1; | |
362 | continue; | |
363 | } | |
121481ab LT |
364 | if (!strcmp(path, "--add")) { |
365 | allow_add = 1; | |
366 | continue; | |
367 | } | |
192268c1 JH |
368 | if (!strcmp(path, "--replace")) { |
369 | allow_replace = 1; | |
370 | continue; | |
371 | } | |
121481ab LT |
372 | if (!strcmp(path, "--remove")) { |
373 | allow_remove = 1; | |
374 | continue; | |
375 | } | |
376 | if (!strcmp(path, "--refresh")) { | |
90535218 | 377 | has_errors |= refresh_cache(); |
121481ab LT |
378 | continue; |
379 | } | |
9945d980 | 380 | if (!strcmp(path, "--cacheinfo")) { |
b3f94c4b | 381 | if (i+3 >= argc) |
215a7ad1 | 382 | die("git-update-index: --cacheinfo <mode> <sha1> <path>"); |
b3f94c4b | 383 | if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) |
215a7ad1 | 384 | die("git-update-index: --cacheinfo cannot add %s", argv[i+3]); |
9945d980 LT |
385 | i += 3; |
386 | continue; | |
387 | } | |
df6e1516 BL |
388 | if (!strcmp(path, "--info-only")) { |
389 | info_only = 1; | |
390 | continue; | |
391 | } | |
0ff5bf7c | 392 | if (!strcmp(path, "--force-remove")) { |
9b63f501 | 393 | force_remove = 1; |
0ff5bf7c JH |
394 | continue; |
395 | } | |
396 | ||
c6e007b0 JB |
397 | if (!strcmp(path, "--ignore-missing")) { |
398 | not_new = 1; | |
399 | continue; | |
400 | } | |
2de381f9 | 401 | die("unknown option %s", path); |
121481ab | 402 | } |
cfb0af1d | 403 | path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path); |
e83c5163 LT |
404 | if (!verify_path(path)) { |
405 | fprintf(stderr, "Ignoring path %s\n", argv[i]); | |
406 | continue; | |
407 | } | |
9b63f501 PB |
408 | if (force_remove) { |
409 | if (remove_file_from_cache(path)) | |
34143b26 | 410 | die("git-update-index: unable to remove %s", path); |
9b63f501 PB |
411 | continue; |
412 | } | |
9614b8dc | 413 | if (add_file_to_cache(path)) |
34143b26 | 414 | die("Unable to process file %s", path); |
e83c5163 | 415 | } |
415e96c8 JH |
416 | if (write_cache(newfd, active_cache, active_nr) || |
417 | commit_index_file(&cache_file)) | |
2de381f9 | 418 | die("Unable to write new cachefile"); |
9614b8dc | 419 | |
c4b83e61 | 420 | return has_errors ? 1 : 0; |
e83c5163 | 421 | } |