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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 | */ | |
192268c1 | 15 | static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0; |
c6e007b0 JB |
16 | |
17 | /* Three functions to allow overloaded pointer return; see linux/err.h */ | |
18 | static inline void *ERR_PTR(long error) | |
19 | { | |
20 | return (void *) error; | |
21 | } | |
22 | ||
23 | static inline long PTR_ERR(const void *ptr) | |
24 | { | |
25 | return (long) ptr; | |
26 | } | |
27 | ||
28 | static inline long IS_ERR(const void *ptr) | |
29 | { | |
30 | return (unsigned long)ptr > (unsigned long)-1000L; | |
31 | } | |
121481ab | 32 | |
ee267527 | 33 | static int add_file_to_cache(char *path) |
e83c5163 | 34 | { |
4c5abf42 | 35 | int size, namelen, option, status; |
e83c5163 LT |
36 | struct cache_entry *ce; |
37 | struct stat st; | |
38 | int fd; | |
ffbe1add | 39 | char *target; |
e83c5163 | 40 | |
4c5abf42 JH |
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-cache --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)) { | |
121481ab LT |
52 | if (allow_remove) |
53 | return remove_file_from_cache(path); | |
54 | } | |
071c41a0 | 55 | return error("open(\"%s\"): %s", path, strerror(errno)); |
e83c5163 | 56 | } |
e83c5163 LT |
57 | namelen = strlen(path); |
58 | size = cache_entry_size(namelen); | |
812666c8 | 59 | ce = xmalloc(size); |
e83c5163 LT |
60 | memset(ce, 0, size); |
61 | memcpy(ce->name, path, namelen); | |
711cf3a0 | 62 | fill_stat_cache_info(ce, &st); |
e4479470 | 63 | ce->ce_mode = create_ce_mode(st.st_mode); |
f5cabd13 | 64 | ce->ce_flags = htons(namelen); |
8ae0a8c5 KS |
65 | switch (st.st_mode & S_IFMT) { |
66 | case S_IFREG: | |
67 | fd = open(path, O_RDONLY); | |
68 | if (fd < 0) | |
69 | return -1; | |
70 | if (index_fd(ce->sha1, fd, &st) < 0) | |
71 | return -1; | |
72 | break; | |
73 | case S_IFLNK: | |
ffbe1add KS |
74 | target = xmalloc(st.st_size+1); |
75 | if (readlink(path, target, st.st_size+1) != st.st_size) { | |
76 | free(target); | |
8ae0a8c5 | 77 | return -1; |
ffbe1add KS |
78 | } |
79 | if (write_sha1_file(target, st.st_size, "blob", ce->sha1)) | |
8ae0a8c5 | 80 | return -1; |
ffbe1add | 81 | free(target); |
8ae0a8c5 KS |
82 | break; |
83 | default: | |
e83c5163 | 84 | return -1; |
8ae0a8c5 | 85 | } |
192268c1 JH |
86 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
87 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
88 | return add_cache_entry(ce, option); | |
121481ab LT |
89 | } |
90 | ||
711cf3a0 LT |
91 | static int match_data(int fd, void *buffer, unsigned long size) |
92 | { | |
93 | while (size) { | |
94 | char compare[1024]; | |
95 | int ret = read(fd, compare, sizeof(compare)); | |
96 | ||
97 | if (ret <= 0 || ret > size || memcmp(buffer, compare, ret)) | |
98 | return -1; | |
99 | size -= ret; | |
100 | buffer += ret; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
32d197f1 | 105 | static int compare_data(struct cache_entry *ce, unsigned long expected_size) |
121481ab | 106 | { |
711cf3a0 LT |
107 | int match = -1; |
108 | int fd = open(ce->name, O_RDONLY); | |
109 | ||
110 | if (fd >= 0) { | |
111 | void *buffer; | |
112 | unsigned long size; | |
cb1da3a7 | 113 | char type[20]; |
711cf3a0 LT |
114 | |
115 | buffer = read_sha1_file(ce->sha1, type, &size); | |
116 | if (buffer) { | |
32d197f1 | 117 | if (size == expected_size && !strcmp(type, "blob")) |
711cf3a0 LT |
118 | match = match_data(fd, buffer, size); |
119 | free(buffer); | |
120 | } | |
121 | close(fd); | |
122 | } | |
123 | return match; | |
124 | } | |
125 | ||
ffbe1add KS |
126 | static int compare_link(struct cache_entry *ce, unsigned long expected_size) |
127 | { | |
128 | int match = -1; | |
129 | char *target; | |
130 | void *buffer; | |
131 | unsigned long size; | |
132 | char type[10]; | |
133 | int len; | |
134 | ||
135 | target = xmalloc(expected_size); | |
136 | len = readlink(ce->name, target, expected_size); | |
137 | if (len != expected_size) { | |
138 | free(target); | |
139 | return -1; | |
140 | } | |
141 | buffer = read_sha1_file(ce->sha1, type, &size); | |
142 | if (!buffer) { | |
143 | free(target); | |
144 | return -1; | |
145 | } | |
146 | if (size == expected_size) | |
147 | match = memcmp(buffer, target, size); | |
148 | free(buffer); | |
149 | free(target); | |
150 | return match; | |
151 | } | |
152 | ||
711cf3a0 LT |
153 | /* |
154 | * "refresh" does not calculate a new sha1 file or bring the | |
155 | * cache up-to-date for mode/content changes. But what it | |
156 | * _does_ do is to "re-match" the stat information of a file | |
157 | * with the cache, so that you can refresh the cache for a | |
158 | * file that hasn't been changed but where the stat entry is | |
159 | * out of date. | |
160 | * | |
667bb59b | 161 | * For example, you'd want to do this after doing a "git-read-tree", |
711cf3a0 LT |
162 | * to link up the stat cache details with the proper files. |
163 | */ | |
164 | static struct cache_entry *refresh_entry(struct cache_entry *ce) | |
165 | { | |
166 | struct stat st; | |
167 | struct cache_entry *updated; | |
168 | int changed, size; | |
169 | ||
8ae0a8c5 | 170 | if (lstat(ce->name, &st) < 0) |
c6e007b0 | 171 | return ERR_PTR(-errno); |
711cf3a0 | 172 | |
5d728c84 | 173 | changed = ce_match_stat(ce, &st); |
711cf3a0 LT |
174 | if (!changed) |
175 | return ce; | |
176 | ||
121481ab | 177 | /* |
8ae0a8c5 | 178 | * If the mode or type has changed, there's no point in trying |
711cf3a0 | 179 | * to refresh the entry - it's not going to match |
121481ab | 180 | */ |
8ae0a8c5 | 181 | if (changed & (MODE_CHANGED | TYPE_CHANGED)) |
c6e007b0 | 182 | return ERR_PTR(-EINVAL); |
711cf3a0 | 183 | |
ffbe1add KS |
184 | switch (st.st_mode & S_IFMT) { |
185 | case S_IFREG: | |
186 | if (compare_data(ce, st.st_size)) | |
187 | return ERR_PTR(-EINVAL); | |
188 | break; | |
189 | case S_IFLNK: | |
190 | if (compare_link(ce, st.st_size)) | |
191 | return ERR_PTR(-EINVAL); | |
192 | break; | |
193 | default: | |
c6e007b0 | 194 | return ERR_PTR(-EINVAL); |
ffbe1add | 195 | } |
711cf3a0 LT |
196 | |
197 | size = ce_size(ce); | |
812666c8 | 198 | updated = xmalloc(size); |
711cf3a0 LT |
199 | memcpy(updated, ce, size); |
200 | fill_stat_cache_info(updated, &st); | |
201 | return updated; | |
121481ab LT |
202 | } |
203 | ||
90535218 | 204 | static int refresh_cache(void) |
121481ab LT |
205 | { |
206 | int i; | |
90535218 | 207 | int has_errors = 0; |
121481ab | 208 | |
711cf3a0 | 209 | for (i = 0; i < active_nr; i++) { |
1bc992ac JH |
210 | struct cache_entry *ce, *new; |
211 | ce = active_cache[i]; | |
212 | if (ce_stage(ce)) { | |
213 | printf("%s: needs merge\n", ce->name); | |
90535218 | 214 | has_errors = 1; |
1bc992ac JH |
215 | while ((i < active_nr) && |
216 | ! strcmp(active_cache[i]->name, ce->name)) | |
217 | i++; | |
218 | i--; | |
219 | continue; | |
220 | } | |
711cf3a0 | 221 | |
1bc992ac | 222 | new = refresh_entry(ce); |
c6e007b0 | 223 | if (IS_ERR(new)) { |
90535218 | 224 | if (!(not_new && PTR_ERR(new) == -ENOENT)) { |
c6e007b0 | 225 | printf("%s: needs update\n", ce->name); |
90535218 JH |
226 | has_errors = 1; |
227 | } | |
711cf3a0 LT |
228 | continue; |
229 | } | |
ee267527 | 230 | active_cache_changed = 1; |
62d046a0 PB |
231 | /* You can NOT just free active_cache[i] here, since it |
232 | * might not be necessarily malloc()ed but can also come | |
233 | * from mmap(). */ | |
711cf3a0 LT |
234 | active_cache[i] = new; |
235 | } | |
90535218 | 236 | return has_errors; |
e83c5163 LT |
237 | } |
238 | ||
e83c5163 LT |
239 | /* |
240 | * We fundamentally don't like some paths: we don't want | |
241 | * dot or dot-dot anywhere, and in fact, we don't even want | |
4bb04f21 | 242 | * any other dot-files (.git or anything else). They |
e83c5163 LT |
243 | * are hidden, for chist sake. |
244 | * | |
245 | * Also, we don't want double slashes or slashes at the | |
aebb2679 | 246 | * end that can make pathnames ambiguous. |
e83c5163 LT |
247 | */ |
248 | static int verify_path(char *path) | |
249 | { | |
250 | char c; | |
251 | ||
252 | goto inside; | |
253 | for (;;) { | |
254 | if (!c) | |
255 | return 1; | |
256 | if (c == '/') { | |
257 | inside: | |
258 | c = *path++; | |
259 | if (c != '/' && c != '.' && c != '\0') | |
260 | continue; | |
261 | return 0; | |
262 | } | |
263 | c = *path++; | |
264 | } | |
265 | } | |
266 | ||
9945d980 LT |
267 | static int add_cacheinfo(char *arg1, char *arg2, char *arg3) |
268 | { | |
192268c1 | 269 | int size, len, option; |
9945d980 LT |
270 | unsigned int mode; |
271 | unsigned char sha1[20]; | |
272 | struct cache_entry *ce; | |
273 | ||
274 | if (sscanf(arg1, "%o", &mode) != 1) | |
275 | return -1; | |
9945d980 LT |
276 | if (get_sha1_hex(arg2, sha1)) |
277 | return -1; | |
9945d980 LT |
278 | if (!verify_path(arg3)) |
279 | return -1; | |
9945d980 LT |
280 | |
281 | len = strlen(arg3); | |
282 | size = cache_entry_size(len); | |
812666c8 | 283 | ce = xmalloc(size); |
9945d980 LT |
284 | memset(ce, 0, size); |
285 | ||
286 | memcpy(ce->sha1, sha1, 20); | |
287 | memcpy(ce->name, arg3, len); | |
f5cabd13 | 288 | ce->ce_flags = htons(len); |
e4479470 | 289 | ce->ce_mode = create_ce_mode(mode); |
192268c1 JH |
290 | option = allow_add ? ADD_CACHE_OK_TO_ADD : 0; |
291 | option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0; | |
292 | return add_cache_entry(ce, option); | |
9945d980 LT |
293 | } |
294 | ||
e99d59ff | 295 | static struct cache_file cache_file; |
f2a19340 | 296 | |
e83c5163 LT |
297 | int main(int argc, char **argv) |
298 | { | |
90535218 | 299 | int i, newfd, entries, has_errors = 0; |
121481ab | 300 | int allow_options = 1; |
bb233d69 | 301 | |
415e96c8 | 302 | newfd = hold_index_file_for_update(&cache_file, get_index_file()); |
9614b8dc | 303 | if (newfd < 0) |
2de381f9 | 304 | die("unable to create new cachefile"); |
9614b8dc | 305 | |
e83c5163 | 306 | entries = read_cache(); |
9614b8dc | 307 | if (entries < 0) |
2de381f9 | 308 | die("cache corrupted"); |
e83c5163 | 309 | |
e83c5163 LT |
310 | for (i = 1 ; i < argc; i++) { |
311 | char *path = argv[i]; | |
121481ab LT |
312 | |
313 | if (allow_options && *path == '-') { | |
314 | if (!strcmp(path, "--")) { | |
315 | allow_options = 0; | |
316 | continue; | |
317 | } | |
318 | if (!strcmp(path, "--add")) { | |
319 | allow_add = 1; | |
320 | continue; | |
321 | } | |
192268c1 JH |
322 | if (!strcmp(path, "--replace")) { |
323 | allow_replace = 1; | |
324 | continue; | |
325 | } | |
121481ab LT |
326 | if (!strcmp(path, "--remove")) { |
327 | allow_remove = 1; | |
328 | continue; | |
329 | } | |
330 | if (!strcmp(path, "--refresh")) { | |
90535218 | 331 | has_errors |= refresh_cache(); |
121481ab LT |
332 | continue; |
333 | } | |
9945d980 | 334 | if (!strcmp(path, "--cacheinfo")) { |
b3f94c4b | 335 | if (i+3 >= argc) |
667bb59b | 336 | die("git-update-cache: --cacheinfo <mode> <sha1> <path>"); |
b3f94c4b | 337 | if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) |
667bb59b | 338 | die("git-update-cache: --cacheinfo cannot add %s", argv[i+3]); |
9945d980 LT |
339 | i += 3; |
340 | continue; | |
341 | } | |
0ff5bf7c JH |
342 | if (!strcmp(path, "--force-remove")) { |
343 | if (argc <= i + 1) | |
667bb59b | 344 | die("git-update-cache: --force-remove <path>"); |
0ff5bf7c | 345 | if (remove_file_from_cache(argv[i+1])) |
667bb59b | 346 | die("git-update-cache: --force-remove cannot remove %s", argv[i+1]); |
0ff5bf7c JH |
347 | i++; |
348 | continue; | |
349 | } | |
350 | ||
c6e007b0 JB |
351 | if (!strcmp(path, "--ignore-missing")) { |
352 | not_new = 1; | |
353 | continue; | |
354 | } | |
2de381f9 | 355 | die("unknown option %s", path); |
121481ab | 356 | } |
e83c5163 LT |
357 | if (!verify_path(path)) { |
358 | fprintf(stderr, "Ignoring path %s\n", argv[i]); | |
359 | continue; | |
360 | } | |
9614b8dc | 361 | if (add_file_to_cache(path)) |
2de381f9 | 362 | die("Unable to add %s to database", path); |
e83c5163 | 363 | } |
415e96c8 JH |
364 | if (write_cache(newfd, active_cache, active_nr) || |
365 | commit_index_file(&cache_file)) | |
2de381f9 | 366 | die("Unable to write new cachefile"); |
9614b8dc | 367 | |
c4b83e61 | 368 | return has_errors ? 1 : 0; |
e83c5163 | 369 | } |