60c8417496f72ad3bbd8d436f44f109e593994bf
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7/*
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
12 * like "git-update-index *" and suddenly having all the object
13 * files be revision controlled.
14 */
15static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
16static int force_remove;
17/* Three functions to allow overloaded pointer return; see linux/err.h */
19static inline void *ERR_PTR(long error)
20{
21 return (void *) error;
22}
23static inline long PTR_ERR(const void *ptr)
25{
26 return (long) ptr;
27}
28static inline long IS_ERR(const void *ptr)
30{
31 return (unsigned long)ptr > (unsigned long)-1000L;
32}
33static int add_file_to_cache(char *path)
35{
36 int size, namelen, option, status;
37 struct cache_entry *ce;
38 struct stat st;
39 int fd;
40 char *target;
41 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-index --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)) {
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 }
63 }
64 if (0 == status)
65 return error("%s: is a directory - add files inside instead",
66 path);
67 else
68 return error("lstat(\"%s\"): %s", path,
69 strerror(errno));
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 ce->ce_mode = create_ce_mode(st.st_mode);
78 ce->ce_flags = htons(namelen);
79 switch (st.st_mode & S_IFMT) {
80 case S_IFREG:
81 fd = open(path, O_RDONLY);
82 if (fd < 0)
83 return error("open(\"%s\"): %s", path, strerror(errno));
84 if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
85 return error("%s: failed to insert into database", path);
86 break;
87 case S_IFLNK:
88 target = xmalloc(st.st_size+1);
89 if (readlink(path, target, st.st_size+1) != st.st_size) {
90 char *errstr = strerror(errno);
91 free(target);
92 return error("readlink(\"%s\"): %s", path,
93 errstr);
94 }
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))
101 return error("%s: failed to insert into database", path);
102 free(target);
103 break;
104 default:
105 return error("%s: unsupported file type", path);
106 }
107 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
108 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
109 if (add_cache_entry(ce, option))
110 return error("%s: cannot add to the index - missing --add option?",
111 path);
112 return 0;
113}
114static int compare_data(struct cache_entry *ce, struct stat *st)
116{
117 int match = -1;
118 int fd = open(ce->name, O_RDONLY);
119 if (fd >= 0) {
121 unsigned char sha1[20];
122 if (!index_fd(sha1, fd, st, 0, NULL))
123 match = memcmp(sha1, ce->sha1, 20);
124 close(fd);
125 }
126 return match;
127}
128static 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 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/*
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 *
164 * For example, you'd want to do this after doing a "git-read-tree",
165 * to link up the stat cache details with the proper files.
166 */
167static struct cache_entry *refresh_entry(struct cache_entry *ce)
168{
169 struct stat st;
170 struct cache_entry *updated;
171 int changed, size;
172 if (lstat(ce->name, &st) < 0)
174 return ERR_PTR(-errno);
175 changed = ce_match_stat(ce, &st);
177 if (!changed)
178 return ce;
179 /*
181 * If the mode or type has changed, there's no point in trying
182 * to refresh the entry - it's not going to match
183 */
184 if (changed & (MODE_CHANGED | TYPE_CHANGED))
185 return ERR_PTR(-EINVAL);
186 /* Immediately after read-tree or update-index --cacheinfo,
188 * the length field is zero. For other cases the ce_size
189 * should match the SHA1 recorded in the index entry.
190 */
191 if ((changed & DATA_CHANGED) && ce->ce_size != htonl(0))
192 return ERR_PTR(-EINVAL);
193 switch (st.st_mode & S_IFMT) {
195 case S_IFREG:
196 if (compare_data(ce, &st))
197 return ERR_PTR(-EINVAL);
198 break;
199 case S_IFLNK:
200 if (compare_link(ce, st.st_size))
201 return ERR_PTR(-EINVAL);
202 break;
203 default:
204 return ERR_PTR(-EINVAL);
205 }
206 size = ce_size(ce);
208 updated = xmalloc(size);
209 memcpy(updated, ce, size);
210 fill_stat_cache_info(updated, &st);
211 return updated;
212}
213static int refresh_cache(void)
215{
216 int i;
217 int has_errors = 0;
218 for (i = 0; i < active_nr; i++) {
220 struct cache_entry *ce, *new;
221 ce = active_cache[i];
222 if (ce_stage(ce)) {
223 printf("%s: needs merge\n", ce->name);
224 has_errors = 1;
225 while ((i < active_nr) &&
226 ! strcmp(active_cache[i]->name, ce->name))
227 i++;
228 i--;
229 continue;
230 }
231 new = refresh_entry(ce);
233 if (IS_ERR(new)) {
234 if (not_new && PTR_ERR(new) == -ENOENT)
235 continue;
236 if (quiet)
237 continue;
238 printf("%s: needs update\n", ce->name);
239 has_errors = 1;
240 continue;
241 }
242 active_cache_changed = 1;
243 /* You can NOT just free active_cache[i] here, since it
244 * might not be necessarily malloc()ed but can also come
245 * from mmap(). */
246 active_cache[i] = new;
247 }
248 return has_errors;
249}
250/*
252 * We fundamentally don't like some paths: we don't want
253 * dot or dot-dot anywhere, and for obvious reasons don't
254 * want to recurse into ".git" either.
255 *
256 * Also, we don't want double slashes or slashes at the
257 * end that can make pathnames ambiguous.
258 */
259static int verify_dotfile(const char *rest)
260{
261 /*
262 * The first character was '.', but that
263 * has already been discarded, we now test
264 * the rest.
265 */
266 switch (*rest) {
267 /* "." is not allowed */
268 case '\0': case '/':
269 return 0;
270 /*
272 * ".git" followed by NUL or slash is bad. This
273 * shares the path end test with the ".." case.
274 */
275 case 'g':
276 if (rest[1] != 'i')
277 break;
278 if (rest[2] != 't')
279 break;
280 rest += 2;
281 /* fallthrough */
282 case '.':
283 if (rest[1] == '\0' || rest[1] == '/')
284 return 0;
285 }
286 return 1;
287}
288static int verify_path(char *path)
290{
291 char c;
292 goto inside;
294 for (;;) {
295 if (!c)
296 return 1;
297 if (c == '/') {
298inside:
299 c = *path++;
300 switch (c) {
301 default:
302 continue;
303 case '/': case '\0':
304 break;
305 case '.':
306 if (verify_dotfile(path))
307 continue;
308 }
309 return 0;
310 }
311 c = *path++;
312 }
313}
314static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
316{
317 int size, len, option;
318 unsigned int mode;
319 unsigned char sha1[20];
320 struct cache_entry *ce;
321 if (sscanf(arg1, "%o", &mode) != 1)
323 return -1;
324 if (get_sha1_hex(arg2, sha1))
325 return -1;
326 if (!verify_path(arg3))
327 return -1;
328 len = strlen(arg3);
330 size = cache_entry_size(len);
331 ce = xmalloc(size);
332 memset(ce, 0, size);
333 memcpy(ce->sha1, sha1, 20);
335 memcpy(ce->name, arg3, len);
336 ce->ce_flags = htons(len);
337 ce->ce_mode = create_ce_mode(mode);
338 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
339 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
340 return add_cache_entry(ce, option);
341}
342static struct cache_file cache_file;
344int main(int argc, char **argv)
346{
347 int i, newfd, entries, has_errors = 0;
348 int allow_options = 1;
349 const char *prefix = setup_git_directory();
350 newfd = hold_index_file_for_update(&cache_file, get_index_file());
352 if (newfd < 0)
353 die("unable to create new cachefile");
354 entries = read_cache();
356 if (entries < 0)
357 die("cache corrupted");
358 for (i = 1 ; i < argc; i++) {
360 char *path = argv[i];
361 if (allow_options && *path == '-') {
363 if (!strcmp(path, "--")) {
364 allow_options = 0;
365 continue;
366 }
367 if (!strcmp(path, "-q")) {
368 quiet = 1;
369 continue;
370 }
371 if (!strcmp(path, "--add")) {
372 allow_add = 1;
373 continue;
374 }
375 if (!strcmp(path, "--replace")) {
376 allow_replace = 1;
377 continue;
378 }
379 if (!strcmp(path, "--remove")) {
380 allow_remove = 1;
381 continue;
382 }
383 if (!strcmp(path, "--refresh")) {
384 has_errors |= refresh_cache();
385 continue;
386 }
387 if (!strcmp(path, "--cacheinfo")) {
388 if (i+3 >= argc)
389 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
390 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
391 die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
392 i += 3;
393 continue;
394 }
395 if (!strcmp(path, "--info-only")) {
396 info_only = 1;
397 continue;
398 }
399 if (!strcmp(path, "--force-remove")) {
400 force_remove = 1;
401 continue;
402 }
403 if (!strcmp(path, "--ignore-missing")) {
405 not_new = 1;
406 continue;
407 }
408 die("unknown option %s", path);
409 }
410 path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
411 if (!verify_path(path)) {
412 fprintf(stderr, "Ignoring path %s\n", argv[i]);
413 continue;
414 }
415 if (force_remove) {
416 if (remove_file_from_cache(path))
417 die("git-update-index: unable to remove %s", path);
418 continue;
419 }
420 if (add_file_to_cache(path))
421 die("Unable to process file %s", path);
422 }
423 if (write_cache(newfd, active_cache, active_nr) ||
424 commit_index_file(&cache_file))
425 die("Unable to write new cachefile");
426 return has_errors ? 1 : 0;
428}