[PATCH] Whitespace Fixes
[git/git.git] / update-cache.c
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8bc9a0c7
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
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6#include "cache.h"
7
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8/*
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.
14 */
15static int allow_add = 0, allow_remove = 0;
16
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17static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
18{
19 z_stream stream;
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20 unsigned long size = st->st_size;
21 int max_out_bytes = namelen + size + 200;
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22 void *out = malloc(max_out_bytes);
23 void *metadata = malloc(namelen + 200);
3607c27f 24 void *in;
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25 SHA_CTX c;
26
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27 in = "";
28 if (size)
29 in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
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30 close(fd);
31 if (!out || (int)(long)in == -1)
32 return -1;
33
34 memset(&stream, 0, sizeof(stream));
35 deflateInit(&stream, Z_BEST_COMPRESSION);
36
37 /*
38 * ASCII size + nul byte
39 */
40 stream.next_in = metadata;
3607c27f 41 stream.avail_in = 1+sprintf(metadata, "blob %lu", size);
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42 stream.next_out = out;
43 stream.avail_out = max_out_bytes;
44 while (deflate(&stream, 0) == Z_OK)
45 /* nothing */;
46
47 /*
48 * File content
49 */
50 stream.next_in = in;
3607c27f 51 stream.avail_in = size;
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52 while (deflate(&stream, Z_FINISH) == Z_OK)
53 /*nothing */;
54
55 deflateEnd(&stream);
56
57 SHA1_Init(&c);
58 SHA1_Update(&c, out, stream.total_out);
59 SHA1_Final(ce->sha1, &c);
60
61 return write_sha1_buffer(ce->sha1, out, stream.total_out);
62}
63
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64/*
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.
68 */
69static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
70{
71 ce->ctime.sec = st->st_ctime;
72 ce->ctime.nsec = st->st_ctim.tv_nsec;
73 ce->mtime.sec = st->st_mtime;
74 ce->mtime.nsec = st->st_mtim.tv_nsec;
75 ce->st_dev = st->st_dev;
76 ce->st_ino = st->st_ino;
77 ce->st_uid = st->st_uid;
78 ce->st_gid = st->st_gid;
79}
80
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81static int add_file_to_cache(char *path)
82{
83 int size, namelen;
84 struct cache_entry *ce;
85 struct stat st;
86 int fd;
87
88 fd = open(path, O_RDONLY);
89 if (fd < 0) {
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90 if (errno == ENOENT) {
91 if (allow_remove)
92 return remove_file_from_cache(path);
93 }
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94 return -1;
95 }
96 if (fstat(fd, &st) < 0) {
97 close(fd);
98 return -1;
99 }
100 namelen = strlen(path);
101 size = cache_entry_size(namelen);
102 ce = malloc(size);
103 memset(ce, 0, size);
104 memcpy(ce->name, path, namelen);
711cf3a0 105 fill_stat_cache_info(ce, &st);
e83c5163 106 ce->st_mode = st.st_mode;
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107 ce->st_size = st.st_size;
108 ce->namelen = namelen;
109
110 if (index_fd(path, namelen, ce, fd, &st) < 0)
111 return -1;
112
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113 return add_cache_entry(ce, allow_add);
114}
115
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116static int match_data(int fd, void *buffer, unsigned long size)
117{
118 while (size) {
119 char compare[1024];
120 int ret = read(fd, compare, sizeof(compare));
121
122 if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
123 return -1;
124 size -= ret;
125 buffer += ret;
126 }
127 return 0;
128}
129
32d197f1 130static int compare_data(struct cache_entry *ce, unsigned long expected_size)
121481ab 131{
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132 int match = -1;
133 int fd = open(ce->name, O_RDONLY);
134
135 if (fd >= 0) {
136 void *buffer;
137 unsigned long size;
138 char type[10];
139
140 buffer = read_sha1_file(ce->sha1, type, &size);
141 if (buffer) {
32d197f1 142 if (size == expected_size && !strcmp(type, "blob"))
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143 match = match_data(fd, buffer, size);
144 free(buffer);
145 }
146 close(fd);
147 }
148 return match;
149}
150
151/*
152 * "refresh" does not calculate a new sha1 file or bring the
153 * cache up-to-date for mode/content changes. But what it
154 * _does_ do is to "re-match" the stat information of a file
155 * with the cache, so that you can refresh the cache for a
156 * file that hasn't been changed but where the stat entry is
157 * out of date.
158 *
159 * For example, you'd want to do this after doing a "read-tree",
160 * to link up the stat cache details with the proper files.
161 */
162static struct cache_entry *refresh_entry(struct cache_entry *ce)
163{
164 struct stat st;
165 struct cache_entry *updated;
166 int changed, size;
167
168 if (stat(ce->name, &st) < 0)
169 return NULL;
170
171 changed = cache_match_stat(ce, &st);
172 if (!changed)
173 return ce;
174
121481ab 175 /*
32d197f1 176 * If the mode has changed, there's no point in trying
711cf3a0 177 * to refresh the entry - it's not going to match
121481ab 178 */
32d197f1 179 if (changed & MODE_CHANGED)
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180 return NULL;
181
32d197f1 182 if (compare_data(ce, st.st_size))
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183 return NULL;
184
185 size = ce_size(ce);
186 updated = malloc(size);
187 memcpy(updated, ce, size);
188 fill_stat_cache_info(updated, &st);
32d197f1 189 updated->st_size = st.st_size;
711cf3a0 190 return updated;
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191}
192
193static void refresh_cache(void)
194{
195 int i;
196
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197 for (i = 0; i < active_nr; i++) {
198 struct cache_entry *ce = active_cache[i];
199 struct cache_entry *new = refresh_entry(ce);
200
201 if (!new) {
202 printf("%s: needs update\n", ce->name);
203 continue;
204 }
205 active_cache[i] = new;
206 }
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207}
208
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209/*
210 * We fundamentally don't like some paths: we don't want
211 * dot or dot-dot anywhere, and in fact, we don't even want
4bb04f21 212 * any other dot-files (.git or anything else). They
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213 * are hidden, for chist sake.
214 *
215 * Also, we don't want double slashes or slashes at the
aebb2679 216 * end that can make pathnames ambiguous.
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217 */
218static int verify_path(char *path)
219{
220 char c;
221
222 goto inside;
223 for (;;) {
224 if (!c)
225 return 1;
226 if (c == '/') {
227inside:
228 c = *path++;
229 if (c != '/' && c != '.' && c != '\0')
230 continue;
231 return 0;
232 }
233 c = *path++;
234 }
235}
236
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237static int remove_lock = 0;
238
239static void remove_lock_file(void)
240{
241 if (remove_lock)
4bb04f21 242 unlink(".git/index.lock");
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243}
244
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245int main(int argc, char **argv)
246{
247 int i, newfd, entries;
121481ab 248 int allow_options = 1;
e83c5163 249
4bb04f21 250 newfd = open(".git/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
9614b8dc 251 if (newfd < 0)
2de381f9 252 die("unable to create new cachefile");
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253
254 atexit(remove_lock_file);
255 remove_lock = 1;
256
e83c5163 257 entries = read_cache();
9614b8dc 258 if (entries < 0)
2de381f9 259 die("cache corrupted");
e83c5163 260
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261 for (i = 1 ; i < argc; i++) {
262 char *path = argv[i];
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263
264 if (allow_options && *path == '-') {
265 if (!strcmp(path, "--")) {
266 allow_options = 0;
267 continue;
268 }
269 if (!strcmp(path, "--add")) {
270 allow_add = 1;
271 continue;
272 }
273 if (!strcmp(path, "--remove")) {
274 allow_remove = 1;
275 continue;
276 }
277 if (!strcmp(path, "--refresh")) {
278 refresh_cache();
279 continue;
280 }
2de381f9 281 die("unknown option %s", path);
121481ab 282 }
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283 if (!verify_path(path)) {
284 fprintf(stderr, "Ignoring path %s\n", argv[i]);
285 continue;
286 }
9614b8dc 287 if (add_file_to_cache(path))
2de381f9 288 die("Unable to add %s to database", path);
e83c5163 289 }
9614b8dc 290 if (write_cache(newfd, active_cache, active_nr) ||
4bb04f21 291 rename(".git/index.lock", ".git/index"))
2de381f9 292 die("Unable to write new cachefile");
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293
294 remove_lock = 0;
19b2860c 295 return 0;
e83c5163 296}