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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 | |
667bb59b | 12 | * like "git-update-cache *" 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, | |
47 | * "git-update-cache --remove path" would not work. | |
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)) { | |
121481ab LT |
53 | if (allow_remove) |
54 | return remove_file_from_cache(path); | |
55 | } | |
071c41a0 | 56 | return error("open(\"%s\"): %s", path, strerror(errno)); |
e83c5163 | 57 | } |
e83c5163 LT |
58 | namelen = strlen(path); |
59 | size = cache_entry_size(namelen); | |
812666c8 | 60 | ce = xmalloc(size); |
e83c5163 LT |
61 | memset(ce, 0, size); |
62 | memcpy(ce->name, path, namelen); | |
711cf3a0 | 63 | fill_stat_cache_info(ce, &st); |
e4479470 | 64 | ce->ce_mode = create_ce_mode(st.st_mode); |
f5cabd13 | 65 | ce->ce_flags = htons(namelen); |
8ae0a8c5 KS |
66 | switch (st.st_mode & S_IFMT) { |
67 | case S_IFREG: | |
68 | fd = open(path, O_RDONLY); | |
69 | if (fd < 0) | |
70 | return -1; | |
df6e1516 | 71 | if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0) |
8ae0a8c5 KS |
72 | return -1; |
73 | break; | |
74 | case S_IFLNK: | |
ffbe1add KS |
75 | target = xmalloc(st.st_size+1); |
76 | if (readlink(path, target, st.st_size+1) != st.st_size) { | |
77 | free(target); | |
8ae0a8c5 | 78 | return -1; |
ffbe1add | 79 | } |
df6e1516 BL |
80 | if (info_only) { |
81 | unsigned char hdr[50]; | |
82 | int hdrlen; | |
83 | write_sha1_file_prepare(target, st.st_size, "blob", | |
84 | ce->sha1, hdr, &hdrlen); | |
85 | } else if (write_sha1_file(target, st.st_size, "blob", ce->sha1)) | |
8ae0a8c5 | 86 | return -1; |
ffbe1add | 87 | free(target); |
8ae0a8c5 KS |
88 | break; |
89 | default: | |
e83c5163 | 90 | return -1; |
8ae0a8c5 | 91 | } |
192268c1 JH |
92 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
93 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
94 | return add_cache_entry(ce, option); | |
121481ab LT |
95 | } |
96 | ||
69a97f1d | 97 | static int compare_data(struct cache_entry *ce, struct stat *st) |
121481ab | 98 | { |
711cf3a0 LT |
99 | int match = -1; |
100 | int fd = open(ce->name, O_RDONLY); | |
101 | ||
102 | if (fd >= 0) { | |
69a97f1d BL |
103 | unsigned char sha1[20]; |
104 | if (!index_fd(sha1, fd, st, 0, NULL)) | |
105 | match = memcmp(sha1, ce->sha1, 20); | |
711cf3a0 LT |
106 | close(fd); |
107 | } | |
108 | return match; | |
109 | } | |
110 | ||
ffbe1add KS |
111 | static int compare_link(struct cache_entry *ce, unsigned long expected_size) |
112 | { | |
113 | int match = -1; | |
114 | char *target; | |
115 | void *buffer; | |
116 | unsigned long size; | |
117 | char type[10]; | |
118 | int len; | |
119 | ||
120 | target = xmalloc(expected_size); | |
121 | len = readlink(ce->name, target, expected_size); | |
122 | if (len != expected_size) { | |
123 | free(target); | |
124 | return -1; | |
125 | } | |
126 | buffer = read_sha1_file(ce->sha1, type, &size); | |
127 | if (!buffer) { | |
128 | free(target); | |
129 | return -1; | |
130 | } | |
131 | if (size == expected_size) | |
132 | match = memcmp(buffer, target, size); | |
133 | free(buffer); | |
134 | free(target); | |
135 | return match; | |
136 | } | |
137 | ||
711cf3a0 LT |
138 | /* |
139 | * "refresh" does not calculate a new sha1 file or bring the | |
140 | * cache up-to-date for mode/content changes. But what it | |
141 | * _does_ do is to "re-match" the stat information of a file | |
142 | * with the cache, so that you can refresh the cache for a | |
143 | * file that hasn't been changed but where the stat entry is | |
144 | * out of date. | |
145 | * | |
667bb59b | 146 | * For example, you'd want to do this after doing a "git-read-tree", |
711cf3a0 LT |
147 | * to link up the stat cache details with the proper files. |
148 | */ | |
149 | static struct cache_entry *refresh_entry(struct cache_entry *ce) | |
150 | { | |
151 | struct stat st; | |
152 | struct cache_entry *updated; | |
153 | int changed, size; | |
154 | ||
8ae0a8c5 | 155 | if (lstat(ce->name, &st) < 0) |
c6e007b0 | 156 | return ERR_PTR(-errno); |
711cf3a0 | 157 | |
5d728c84 | 158 | changed = ce_match_stat(ce, &st); |
711cf3a0 LT |
159 | if (!changed) |
160 | return ce; | |
161 | ||
121481ab | 162 | /* |
8ae0a8c5 | 163 | * If the mode or type has changed, there's no point in trying |
711cf3a0 | 164 | * to refresh the entry - it's not going to match |
121481ab | 165 | */ |
8ae0a8c5 | 166 | if (changed & (MODE_CHANGED | TYPE_CHANGED)) |
c6e007b0 | 167 | return ERR_PTR(-EINVAL); |
711cf3a0 | 168 | |
ffbe1add KS |
169 | switch (st.st_mode & S_IFMT) { |
170 | case S_IFREG: | |
69a97f1d | 171 | if (compare_data(ce, &st)) |
ffbe1add KS |
172 | return ERR_PTR(-EINVAL); |
173 | break; | |
174 | case S_IFLNK: | |
175 | if (compare_link(ce, st.st_size)) | |
176 | return ERR_PTR(-EINVAL); | |
177 | break; | |
178 | default: | |
c6e007b0 | 179 | return ERR_PTR(-EINVAL); |
ffbe1add | 180 | } |
711cf3a0 LT |
181 | |
182 | size = ce_size(ce); | |
812666c8 | 183 | updated = xmalloc(size); |
711cf3a0 LT |
184 | memcpy(updated, ce, size); |
185 | fill_stat_cache_info(updated, &st); | |
186 | return updated; | |
121481ab LT |
187 | } |
188 | ||
90535218 | 189 | static int refresh_cache(void) |
121481ab LT |
190 | { |
191 | int i; | |
90535218 | 192 | int has_errors = 0; |
121481ab | 193 | |
711cf3a0 | 194 | for (i = 0; i < active_nr; i++) { |
1bc992ac JH |
195 | struct cache_entry *ce, *new; |
196 | ce = active_cache[i]; | |
197 | if (ce_stage(ce)) { | |
198 | printf("%s: needs merge\n", ce->name); | |
90535218 | 199 | has_errors = 1; |
1bc992ac JH |
200 | while ((i < active_nr) && |
201 | ! strcmp(active_cache[i]->name, ce->name)) | |
202 | i++; | |
203 | i--; | |
204 | continue; | |
205 | } | |
711cf3a0 | 206 | |
1bc992ac | 207 | new = refresh_entry(ce); |
c6e007b0 | 208 | if (IS_ERR(new)) { |
0ed3715f LT |
209 | if (not_new && PTR_ERR(new) == -ENOENT) |
210 | continue; | |
211 | if (quiet) | |
212 | continue; | |
213 | printf("%s: needs update\n", ce->name); | |
214 | has_errors = 1; | |
711cf3a0 LT |
215 | continue; |
216 | } | |
ee267527 | 217 | active_cache_changed = 1; |
62d046a0 PB |
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(). */ | |
711cf3a0 LT |
221 | active_cache[i] = new; |
222 | } | |
90535218 | 223 | return has_errors; |
e83c5163 LT |
224 | } |
225 | ||
e83c5163 LT |
226 | /* |
227 | * We fundamentally don't like some paths: we don't want | |
320d3a1b LT |
228 | * dot or dot-dot anywhere, and for obvious reasons don't |
229 | * want to recurse into ".git" either. | |
e83c5163 LT |
230 | * |
231 | * Also, we don't want double slashes or slashes at the | |
aebb2679 | 232 | * end that can make pathnames ambiguous. |
e83c5163 | 233 | */ |
320d3a1b LT |
234 | static 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 | ||
246 | /* | |
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 | } | |
263 | ||
e83c5163 LT |
264 | static int verify_path(char *path) |
265 | { | |
266 | char c; | |
267 | ||
268 | goto inside; | |
269 | for (;;) { | |
270 | if (!c) | |
271 | return 1; | |
272 | if (c == '/') { | |
273 | inside: | |
274 | c = *path++; | |
320d3a1b LT |
275 | switch (c) { |
276 | default: | |
e83c5163 | 277 | continue; |
320d3a1b LT |
278 | case '/': case '\0': |
279 | break; | |
280 | case '.': | |
281 | if (verify_dotfile(path)) | |
282 | continue; | |
283 | } | |
e83c5163 LT |
284 | return 0; |
285 | } | |
286 | c = *path++; | |
287 | } | |
288 | } | |
289 | ||
9945d980 LT |
290 | static int add_cacheinfo(char *arg1, char *arg2, char *arg3) |
291 | { | |
192268c1 | 292 | int size, len, option; |
9945d980 LT |
293 | unsigned int mode; |
294 | unsigned char sha1[20]; | |
295 | struct cache_entry *ce; | |
296 | ||
297 | if (sscanf(arg1, "%o", &mode) != 1) | |
298 | return -1; | |
9945d980 LT |
299 | if (get_sha1_hex(arg2, sha1)) |
300 | return -1; | |
9945d980 LT |
301 | if (!verify_path(arg3)) |
302 | return -1; | |
9945d980 LT |
303 | |
304 | len = strlen(arg3); | |
305 | size = cache_entry_size(len); | |
812666c8 | 306 | ce = xmalloc(size); |
9945d980 LT |
307 | memset(ce, 0, size); |
308 | ||
309 | memcpy(ce->sha1, sha1, 20); | |
310 | memcpy(ce->name, arg3, len); | |
f5cabd13 | 311 | ce->ce_flags = htons(len); |
e4479470 | 312 | ce->ce_mode = create_ce_mode(mode); |
192268c1 JH |
313 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
314 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
315 | return add_cache_entry(ce, option); | |
9945d980 LT |
316 | } |
317 | ||
e99d59ff | 318 | static struct cache_file cache_file; |
f2a19340 | 319 | |
e83c5163 LT |
320 | int main(int argc, char **argv) |
321 | { | |
90535218 | 322 | int i, newfd, entries, has_errors = 0; |
121481ab | 323 | int allow_options = 1; |
bb233d69 | 324 | |
415e96c8 | 325 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); |
9614b8dc | 326 | if (newfd < 0) |
2de381f9 | 327 | die("unable to create new cachefile"); |
9614b8dc | 328 | |
e83c5163 | 329 | entries = read_cache(); |
9614b8dc | 330 | if (entries < 0) |
2de381f9 | 331 | die("cache corrupted"); |
e83c5163 | 332 | |
e83c5163 LT |
333 | for (i = 1 ; i < argc; i++) { |
334 | char *path = argv[i]; | |
121481ab LT |
335 | |
336 | if (allow_options && *path == '-') { | |
337 | if (!strcmp(path, "--")) { | |
338 | allow_options = 0; | |
339 | continue; | |
340 | } | |
0ed3715f LT |
341 | if (!strcmp(path, "-q")) { |
342 | quiet = 1; | |
343 | continue; | |
344 | } | |
121481ab LT |
345 | if (!strcmp(path, "--add")) { |
346 | allow_add = 1; | |
347 | continue; | |
348 | } | |
192268c1 JH |
349 | if (!strcmp(path, "--replace")) { |
350 | allow_replace = 1; | |
351 | continue; | |
352 | } | |
121481ab LT |
353 | if (!strcmp(path, "--remove")) { |
354 | allow_remove = 1; | |
355 | continue; | |
356 | } | |
357 | if (!strcmp(path, "--refresh")) { | |
90535218 | 358 | has_errors |= refresh_cache(); |
121481ab LT |
359 | continue; |
360 | } | |
9945d980 | 361 | if (!strcmp(path, "--cacheinfo")) { |
b3f94c4b | 362 | if (i+3 >= argc) |
667bb59b | 363 | die("git-update-cache: --cacheinfo <mode> <sha1> <path>"); |
b3f94c4b | 364 | if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) |
667bb59b | 365 | die("git-update-cache: --cacheinfo cannot add %s", argv[i+3]); |
9945d980 LT |
366 | i += 3; |
367 | continue; | |
368 | } | |
df6e1516 BL |
369 | if (!strcmp(path, "--info-only")) { |
370 | info_only = 1; | |
371 | continue; | |
372 | } | |
0ff5bf7c | 373 | if (!strcmp(path, "--force-remove")) { |
9b63f501 | 374 | force_remove = 1; |
0ff5bf7c JH |
375 | continue; |
376 | } | |
377 | ||
c6e007b0 JB |
378 | if (!strcmp(path, "--ignore-missing")) { |
379 | not_new = 1; | |
380 | continue; | |
381 | } | |
2de381f9 | 382 | die("unknown option %s", path); |
121481ab | 383 | } |
e83c5163 LT |
384 | if (!verify_path(path)) { |
385 | fprintf(stderr, "Ignoring path %s\n", argv[i]); | |
386 | continue; | |
387 | } | |
9b63f501 PB |
388 | if (force_remove) { |
389 | if (remove_file_from_cache(path)) | |
390 | die("git-update-cache: --force-remove cannot remove %s", path); | |
391 | continue; | |
392 | } | |
9614b8dc | 393 | if (add_file_to_cache(path)) |
2de381f9 | 394 | die("Unable to add %s to database", path); |
e83c5163 | 395 | } |
415e96c8 JH |
396 | if (write_cache(newfd, active_cache, active_nr) || |
397 | commit_index_file(&cache_file)) | |
2de381f9 | 398 | die("Unable to write new cachefile"); |
9614b8dc | 399 | |
c4b83e61 | 400 | return has_errors ? 1 : 0; |
e83c5163 | 401 | } |