2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
10 * Default to not allowing changes to the list of files. The
11 * tool doesn't actually care, but this makes it harder to add
12 * files to the revision control by mistake by doing something
13 * like "update-cache *" and suddenly having all the object
14 * files be revision controlled.
16 static int allow_add = 0, allow_remove = 0, not_new = 0;
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 index_fd(unsigned char *sha1, int fd, struct stat *st)
37 unsigned long size = st->st_size;
38 int max_out_bytes = size + 200;
39 void *out = xmalloc(max_out_bytes);
40 void *metadata = xmalloc(200);
47 in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
49 if (!out || (int)(long)in == -1)
52 metadata_size = 1+sprintf(metadata, "blob %lu", size);
55 SHA1_Update(&c, metadata, metadata_size);
56 SHA1_Update(&c, in, size);
59 memset(&stream, 0, sizeof(stream));
60 deflateInit(&stream, Z_BEST_COMPRESSION);
63 * ASCII size + nul byte
65 stream.next_in = metadata;
66 stream.avail_in = metadata_size;
67 stream.next_out = out;
68 stream.avail_out = max_out_bytes;
69 while (deflate(&stream, 0) == Z_OK)
76 stream.avail_in = size;
77 while (deflate(&stream, Z_FINISH) == Z_OK)
82 return write_sha1_buffer(sha1, out, stream.total_out);
86 * This only updates the "non-critical" parts of the directory
87 * cache, ie the parts that aren't tracked by GIT, and only used
88 * to validate the cache.
90 static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
92 ce->ce_ctime.sec = htonl(st->st_ctime);
93 ce->ce_mtime.sec = htonl(st->st_mtime);
95 ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec);
96 ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec);
98 ce->ce_dev = htonl(st->st_dev);
99 ce->ce_ino = htonl(st->st_ino);
100 ce->ce_uid = htonl(st->st_uid);
101 ce->ce_gid = htonl(st->st_gid);
102 ce->ce_size = htonl(st->st_size);
105 static int add_file_to_cache(char *path)
108 struct cache_entry *ce;
112 fd = open(path, O_RDONLY);
114 if (errno == ENOENT || errno == ENOTDIR) {
116 return remove_file_from_cache(path);
120 if (fstat(fd, &st) < 0) {
124 namelen = strlen(path);
125 size = cache_entry_size(namelen);
128 memcpy(ce->name, path, namelen);
129 fill_stat_cache_info(ce, &st);
130 ce->ce_mode = create_ce_mode(st.st_mode);
131 ce->ce_flags = htons(namelen);
133 if (index_fd(ce->sha1, fd, &st) < 0)
136 return add_cache_entry(ce, allow_add);
139 static int match_data(int fd, void *buffer, unsigned long size)
143 int ret = read(fd, compare, sizeof(compare));
145 if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
153 static int compare_data(struct cache_entry *ce, unsigned long expected_size)
156 int fd = open(ce->name, O_RDONLY);
163 buffer = read_sha1_file(ce->sha1, type, &size);
165 if (size == expected_size && !strcmp(type, "blob"))
166 match = match_data(fd, buffer, size);
175 * "refresh" does not calculate a new sha1 file or bring the
176 * cache up-to-date for mode/content changes. But what it
177 * _does_ do is to "re-match" the stat information of a file
178 * with the cache, so that you can refresh the cache for a
179 * file that hasn't been changed but where the stat entry is
182 * For example, you'd want to do this after doing a "read-tree",
183 * to link up the stat cache details with the proper files.
185 static struct cache_entry *refresh_entry(struct cache_entry *ce)
188 struct cache_entry *updated;
191 if (stat(ce->name, &st) < 0)
192 return ERR_PTR(-errno);
194 changed = cache_match_stat(ce, &st);
199 * If the mode has changed, there's no point in trying
200 * to refresh the entry - it's not going to match
202 if (changed & MODE_CHANGED)
203 return ERR_PTR(-EINVAL);
205 if (compare_data(ce, st.st_size))
206 return ERR_PTR(-EINVAL);
209 updated = xmalloc(size);
210 memcpy(updated, ce, size);
211 fill_stat_cache_info(updated, &st);
215 static int refresh_cache(void)
220 for (i = 0; i < active_nr; i++) {
221 struct cache_entry *ce, *new;
222 ce = active_cache[i];
224 printf("%s: needs merge\n", ce->name);
226 while ((i < active_nr) &&
227 ! strcmp(active_cache[i]->name, ce->name))
233 new = refresh_entry(ce);
235 if (!(not_new && PTR_ERR(new) == -ENOENT)) {
236 printf("%s: needs update\n", ce->name);
241 active_cache[i] = new;
247 * We fundamentally don't like some paths: we don't want
248 * dot or dot-dot anywhere, and in fact, we don't even want
249 * any other dot-files (.git or anything else). They
250 * are hidden, for chist sake.
252 * Also, we don't want double slashes or slashes at the
253 * end that can make pathnames ambiguous.
255 static int verify_path(char *path)
266 if (c != '/' && c != '.' && c != '\0')
274 static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
278 unsigned char sha1[20];
279 struct cache_entry *ce;
281 if (sscanf(arg1, "%o", &mode) != 1)
283 if (get_sha1_hex(arg2, sha1))
285 if (!verify_path(arg3))
289 size = cache_entry_size(len);
293 memcpy(ce->sha1, sha1, 20);
294 memcpy(ce->name, arg3, len);
295 ce->ce_flags = htons(len);
296 ce->ce_mode = create_ce_mode(mode);
297 return add_cache_entry(ce, allow_add);
300 static const char *lockfile_name = NULL;
302 static void remove_lock_file(void)
305 unlink(lockfile_name);
308 static void remove_lock_file_on_signal(int signo)
313 int main(int argc, char **argv)
315 int i, newfd, entries, has_errors = 0;
316 int allow_options = 1;
317 static char lockfile[MAXPATHLEN+1];
318 const char *indexfile = get_index_file();
320 snprintf(lockfile, sizeof(lockfile), "%s.lock", indexfile);
322 newfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, 0600);
324 die("unable to create new cachefile");
326 signal(SIGINT, remove_lock_file_on_signal);
327 atexit(remove_lock_file);
328 lockfile_name = lockfile;
330 entries = read_cache();
332 die("cache corrupted");
334 for (i = 1 ; i < argc; i++) {
335 char *path = argv[i];
337 if (allow_options && *path == '-') {
338 if (!strcmp(path, "--")) {
342 if (!strcmp(path, "--add")) {
346 if (!strcmp(path, "--remove")) {
350 if (!strcmp(path, "--refresh")) {
351 has_errors |= refresh_cache();
354 if (!strcmp(path, "--cacheinfo")) {
355 if (i+3 >= argc || add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
356 die("update-cache: --cacheinfo <mode> <sha1> <path>");
360 if (!strcmp(path, "--ignore-missing")) {
364 die("unknown option %s", path);
366 if (!verify_path(path)) {
367 fprintf(stderr, "Ignoring path %s\n", argv[i]);
370 if (add_file_to_cache(path))
371 die("Unable to add %s to database", path);
373 if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile))
374 die("Unable to write new cachefile");
376 lockfile_name = NULL;