2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
8 static int remove_file_from_cache(char *path)
10 int pos = cache_name_pos(path, strlen(path));
15 memmove(active_cache + pos, active_cache + pos + 1, (active_nr - pos - 1) * sizeof(struct cache_entry *));
20 static int add_cache_entry(struct cache_entry *ce)
24 pos = cache_name_pos(ce->name, ce->namelen);
26 /* existing match? Just replace it */
28 active_cache[-pos-1] = ce;
32 /* Make sure the array is big enough .. */
33 if (active_nr == active_alloc) {
34 active_alloc = alloc_nr(active_alloc);
35 active_cache = realloc(active_cache, active_alloc * sizeof(struct cache_entry *));
41 memmove(active_cache + pos + 1, active_cache + pos, (active_nr - pos - 1) * sizeof(ce));
42 active_cache[pos] = ce;
46 static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
49 int max_out_bytes = namelen + st->st_size + 200;
50 void *out = malloc(max_out_bytes);
51 void *metadata = malloc(namelen + 200);
52 void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
56 if (!out || (int)(long)in == -1)
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 = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size);
67 stream.next_out = out;
68 stream.avail_out = max_out_bytes;
69 while (deflate(&stream, 0) == Z_OK)
76 stream.avail_in = st->st_size;
77 while (deflate(&stream, Z_FINISH) == Z_OK)
83 SHA1_Update(&c, out, stream.total_out);
84 SHA1_Final(ce->sha1, &c);
86 return write_sha1_buffer(ce->sha1, out, stream.total_out);
89 static int add_file_to_cache(char *path)
92 struct cache_entry *ce;
96 fd = open(path, O_RDONLY);
99 return remove_file_from_cache(path);
102 if (fstat(fd, &st) < 0) {
106 namelen = strlen(path);
107 size = cache_entry_size(namelen);
110 memcpy(ce->name, path, namelen);
111 ce->ctime.sec = st.st_ctime;
112 ce->ctime.nsec = st.st_ctim.tv_nsec;
113 ce->mtime.sec = st.st_mtime;
114 ce->mtime.nsec = st.st_mtim.tv_nsec;
115 ce->st_dev = st.st_dev;
116 ce->st_ino = st.st_ino;
117 ce->st_mode = st.st_mode;
118 ce->st_uid = st.st_uid;
119 ce->st_gid = st.st_gid;
120 ce->st_size = st.st_size;
121 ce->namelen = namelen;
123 if (index_fd(path, namelen, ce, fd, &st) < 0)
126 return add_cache_entry(ce);
129 static int write_cache(int newfd, struct cache_entry **cache, int entries)
132 struct cache_header hdr;
135 hdr.signature = CACHE_SIGNATURE;
137 hdr.entries = entries;
140 SHA1_Update(&c, &hdr, offsetof(struct cache_header, sha1));
141 for (i = 0; i < entries; i++) {
142 struct cache_entry *ce = cache[i];
143 int size = ce_size(ce);
144 SHA1_Update(&c, ce, size);
146 SHA1_Final(hdr.sha1, &c);
148 if (write(newfd, &hdr, sizeof(hdr)) != sizeof(hdr))
151 for (i = 0; i < entries; i++) {
152 struct cache_entry *ce = cache[i];
153 int size = ce_size(ce);
154 if (write(newfd, ce, size) != size)
161 * We fundamentally don't like some paths: we don't want
162 * dot or dot-dot anywhere, and in fact, we don't even want
163 * any other dot-files (.dircache or anything else). They
164 * are hidden, for chist sake.
166 * Also, we don't want double slashes or slashes at the
167 * end that can make pathnames ambiguous.
169 static int verify_path(char *path)
180 if (c != '/' && c != '.' && c != '\0')
188 int main(int argc, char **argv)
190 int i, newfd, entries;
192 entries = read_cache();
194 perror("cache corrupted");
198 newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
200 perror("unable to create new cachefile");
203 for (i = 1 ; i < argc; i++) {
204 char *path = argv[i];
205 if (!verify_path(path)) {
206 fprintf(stderr, "Ignoring path %s\n", argv[i]);
209 if (add_file_to_cache(path)) {
210 fprintf(stderr, "Unable to add %s to database\n", path);
214 if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
217 unlink(".dircache/index.lock");