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 "update-cache *" and suddenly having all the object
13 * files be revision controlled.
15 static int allow_add = 0, allow_remove = 0;
17 static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
20 unsigned long size = st->st_size;
21 int max_out_bytes = namelen + size + 200;
22 void *out = malloc(max_out_bytes);
23 void *metadata = malloc(namelen + 200);
29 in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
31 if (!out || (int)(long)in == -1)
34 memset(&stream, 0, sizeof(stream));
35 deflateInit(&stream, Z_BEST_COMPRESSION);
38 * ASCII size + nul byte
40 stream.next_in = metadata;
41 stream.avail_in = 1+sprintf(metadata, "blob %lu", size);
42 stream.next_out = out;
43 stream.avail_out = max_out_bytes;
44 while (deflate(&stream, 0) == Z_OK)
51 stream.avail_in = size;
52 while (deflate(&stream, Z_FINISH) == Z_OK)
58 SHA1_Update(&c, out, stream.total_out);
59 SHA1_Final(ce->sha1, &c);
61 return write_sha1_buffer(ce->sha1, out, stream.total_out);
65 * This only updates the "non-critical" parts of the directory
66 * cache, ie the parts that aren't tracked by GIT, and only used
67 * to validate the cache.
69 static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
71 ce->ce_ctime.sec = htonl(st->st_ctime);
72 ce->ce_mtime.sec = htonl(st->st_mtime);
74 ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec);
75 ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec);
77 ce->ce_dev = htonl(st->st_dev);
78 ce->ce_ino = htonl(st->st_ino);
79 ce->ce_uid = htonl(st->st_uid);
80 ce->ce_gid = htonl(st->st_gid);
81 ce->ce_size = htonl(st->st_size);
84 static int add_file_to_cache(char *path)
87 struct cache_entry *ce;
91 fd = open(path, O_RDONLY);
93 if (errno == ENOENT) {
95 return remove_file_from_cache(path);
99 if (fstat(fd, &st) < 0) {
103 namelen = strlen(path);
104 size = cache_entry_size(namelen);
107 memcpy(ce->name, path, namelen);
108 fill_stat_cache_info(ce, &st);
109 ce->ce_mode = htonl(st.st_mode);
110 ce->ce_namelen = htons(namelen);
112 if (index_fd(path, namelen, ce, fd, &st) < 0)
115 return add_cache_entry(ce, allow_add);
118 static int match_data(int fd, void *buffer, unsigned long size)
122 int ret = read(fd, compare, sizeof(compare));
124 if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
132 static int compare_data(struct cache_entry *ce, unsigned long expected_size)
135 int fd = open(ce->name, O_RDONLY);
142 buffer = read_sha1_file(ce->sha1, type, &size);
144 if (size == expected_size && !strcmp(type, "blob"))
145 match = match_data(fd, buffer, size);
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
161 * For example, you'd want to do this after doing a "read-tree",
162 * to link up the stat cache details with the proper files.
164 static struct cache_entry *refresh_entry(struct cache_entry *ce)
167 struct cache_entry *updated;
170 if (stat(ce->name, &st) < 0)
173 changed = cache_match_stat(ce, &st);
178 * If the mode has changed, there's no point in trying
179 * to refresh the entry - it's not going to match
181 if (changed & MODE_CHANGED)
184 if (compare_data(ce, st.st_size))
188 updated = malloc(size);
189 memcpy(updated, ce, size);
190 fill_stat_cache_info(updated, &st);
194 static void refresh_cache(void)
198 for (i = 0; i < active_nr; i++) {
199 struct cache_entry *ce = active_cache[i];
200 struct cache_entry *new = refresh_entry(ce);
203 printf("%s: needs update\n", ce->name);
206 active_cache[i] = new;
211 * We fundamentally don't like some paths: we don't want
212 * dot or dot-dot anywhere, and in fact, we don't even want
213 * any other dot-files (.git or anything else). They
214 * are hidden, for chist sake.
216 * Also, we don't want double slashes or slashes at the
217 * end that can make pathnames ambiguous.
219 static int verify_path(char *path)
230 if (c != '/' && c != '.' && c != '\0')
238 static int remove_lock = 0;
240 static void remove_lock_file(void)
243 unlink(".git/index.lock");
246 int main(int argc, char **argv)
248 int i, newfd, entries;
249 int allow_options = 1;
251 newfd = open(".git/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
253 die("unable to create new cachefile");
255 atexit(remove_lock_file);
258 entries = read_cache();
260 die("cache corrupted");
262 for (i = 1 ; i < argc; i++) {
263 char *path = argv[i];
265 if (allow_options && *path == '-') {
266 if (!strcmp(path, "--")) {
270 if (!strcmp(path, "--add")) {
274 if (!strcmp(path, "--remove")) {
278 if (!strcmp(path, "--refresh")) {
282 die("unknown option %s", path);
284 if (!verify_path(path)) {
285 fprintf(stderr, "Ignoring path %s\n", argv[i]);
288 if (add_file_to_cache(path))
289 die("Unable to add %s to database", path);
291 if (write_cache(newfd, active_cache, active_nr) ||
292 rename(".git/index.lock", ".git/index"))
293 die("Unable to write new cachefile");