2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
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.
15 static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
16 static int force_remove;
18 /* Three functions to allow overloaded pointer return; see linux/err.h */
19 static inline void *ERR_PTR(long error)
21 return (void *) error;
24 static inline long PTR_ERR(const void *ptr)
29 static inline long IS_ERR(const void *ptr)
31 return (unsigned long)ptr > (unsigned long)-1000L;
34 static int add_file_to_cache(char *path)
36 int size, namelen, option, status;
37 struct cache_entry *ce;
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-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.
52 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
54 if (remove_file_from_cache(path))
55 return error("%s: cannot remove from the index",
59 } else if (status < 0) {
60 return error("%s: does not exist and --remove not passed",
65 return error("%s: is a directory - add files inside instead",
68 return error("lstat(\"%s\"): %s", path,
71 namelen = strlen(path);
72 size = cache_entry_size(namelen);
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) {
81 fd = open(path, O_RDONLY);
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);
88 target = xmalloc(st.st_size+1);
89 if (readlink(path, target, st.st_size+1) != st.st_size) {
90 char *errstr = strerror(errno);
92 return error("readlink(\"%s\"): %s", path,
96 unsigned char hdr[50];
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);
105 return error("%s: unsupported file type", path);
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?",
115 static int compare_data(struct cache_entry *ce, struct stat *st)
118 int fd = open(ce->name, O_RDONLY);
121 unsigned char sha1[20];
122 if (!index_fd(sha1, fd, st, 0, NULL))
123 match = memcmp(sha1, ce->sha1, 20);
129 static int compare_link(struct cache_entry *ce, unsigned long expected_size)
138 target = xmalloc(expected_size);
139 len = readlink(ce->name, target, expected_size);
140 if (len != expected_size) {
144 buffer = read_sha1_file(ce->sha1, type, &size);
149 if (size == expected_size)
150 match = memcmp(buffer, target, size);
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
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.
167 static struct cache_entry *refresh_entry(struct cache_entry *ce)
170 struct cache_entry *updated;
173 if (lstat(ce->name, &st) < 0)
174 return ERR_PTR(-errno);
176 changed = ce_match_stat(ce, &st);
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
184 if (changed & (MODE_CHANGED | TYPE_CHANGED))
185 return ERR_PTR(-EINVAL);
187 /* 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.
191 if ((changed & DATA_CHANGED) && ce->ce_size != htonl(0))
192 return ERR_PTR(-EINVAL);
194 switch (st.st_mode & S_IFMT) {
196 if (compare_data(ce, &st))
197 return ERR_PTR(-EINVAL);
200 if (compare_link(ce, st.st_size))
201 return ERR_PTR(-EINVAL);
204 return ERR_PTR(-EINVAL);
208 updated = xmalloc(size);
209 memcpy(updated, ce, size);
210 fill_stat_cache_info(updated, &st);
214 static int refresh_cache(void)
219 for (i = 0; i < active_nr; i++) {
220 struct cache_entry *ce, *new;
221 ce = active_cache[i];
223 printf("%s: needs merge\n", ce->name);
225 while ((i < active_nr) &&
226 ! strcmp(active_cache[i]->name, ce->name))
232 new = refresh_entry(ce);
234 if (not_new && PTR_ERR(new) == -ENOENT)
238 printf("%s: needs update\n", ce->name);
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
246 active_cache[i] = new;
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.
256 * Also, we don't want double slashes or slashes at the
257 * end that can make pathnames ambiguous.
259 static int verify_dotfile(const char *rest)
262 * The first character was '.', but that
263 * has already been discarded, we now test
267 /* "." is not allowed */
272 * ".git" followed by NUL or slash is bad. This
273 * shares the path end test with the ".." case.
283 if (rest[1] == '\0' || rest[1] == '/')
289 static int verify_path(char *path)
306 if (verify_dotfile(path))
315 static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
317 int size, len, option;
319 unsigned char sha1[20];
320 struct cache_entry *ce;
322 if (sscanf(arg1, "%o", &mode) != 1)
324 if (get_sha1_hex(arg2, sha1))
326 if (!verify_path(arg3))
330 size = cache_entry_size(len);
334 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);
343 static struct cache_file cache_file;
345 int main(int argc, char **argv)
347 int i, newfd, entries, has_errors = 0;
348 int allow_options = 1;
349 const char *prefix = setup_git_directory();
351 newfd = hold_index_file_for_update(&cache_file, get_index_file());
353 die("unable to create new cachefile");
355 entries = read_cache();
357 die("cache corrupted");
359 for (i = 1 ; i < argc; i++) {
360 char *path = argv[i];
362 if (allow_options && *path == '-') {
363 if (!strcmp(path, "--")) {
367 if (!strcmp(path, "-q")) {
371 if (!strcmp(path, "--add")) {
375 if (!strcmp(path, "--replace")) {
379 if (!strcmp(path, "--remove")) {
383 if (!strcmp(path, "--refresh")) {
384 has_errors |= refresh_cache();
387 if (!strcmp(path, "--cacheinfo")) {
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]);
395 if (!strcmp(path, "--info-only")) {
399 if (!strcmp(path, "--force-remove")) {
404 if (!strcmp(path, "--ignore-missing")) {
408 die("unknown option %s", path);
410 path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
411 if (!verify_path(path)) {
412 fprintf(stderr, "Ignoring path %s\n", argv[i]);
416 if (remove_file_from_cache(path))
417 die("git-update-index: unable to remove %s", path);
420 if (add_file_to_cache(path))
421 die("Unable to process file %s", path);
423 if (write_cache(newfd, active_cache, active_nr) ||
424 commit_index_file(&cache_file))
425 die("Unable to write new cachefile");
427 return has_errors ? 1 : 0;