1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7/*
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.
14 */
15static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
16static int force_remove;
17/* Three functions to allow overloaded pointer return; see linux/err.h */
19static inline void *ERR_PTR(long error)
20{
21 return (void *) error;
22}
23static inline long PTR_ERR(const void *ptr)
25{
26 return (long) ptr;
27}
28static inline long IS_ERR(const void *ptr)
30{
31 return (unsigned long)ptr > (unsigned long)-1000L;
32}
33static int add_file_to_cache(char *path)
35{
36 int size, namelen, option, status;
37 struct cache_entry *ce;
38 struct stat st;
39 int fd;
40 char *target;
41 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.
51 */
52 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
53 if (allow_remove)
54 return remove_file_from_cache(path);
55 }
56 if (0 == status)
57 return error("%s: is a directory", path);
58 else
59 return error("lstat(\"%s\"): %s", path,
60 strerror(errno));
61 }
62 namelen = strlen(path);
63 size = cache_entry_size(namelen);
64 ce = xmalloc(size);
65 memset(ce, 0, size);
66 memcpy(ce->name, path, namelen);
67 fill_stat_cache_info(ce, &st);
68 ce->ce_mode = create_ce_mode(st.st_mode);
69 ce->ce_flags = htons(namelen);
70 switch (st.st_mode & S_IFMT) {
71 case S_IFREG:
72 fd = open(path, O_RDONLY);
73 if (fd < 0)
74 return -1;
75 if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
76 return -1;
77 break;
78 case S_IFLNK:
79 target = xmalloc(st.st_size+1);
80 if (readlink(path, target, st.st_size+1) != st.st_size) {
81 free(target);
82 return -1;
83 }
84 if (info_only) {
85 unsigned char hdr[50];
86 int hdrlen;
87 write_sha1_file_prepare(target, st.st_size, "blob",
88 ce->sha1, hdr, &hdrlen);
89 } else if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
90 return -1;
91 free(target);
92 break;
93 default:
94 return -1;
95 }
96 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
97 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
98 return add_cache_entry(ce, option);
99}
100static int compare_data(struct cache_entry *ce, struct stat *st)
102{
103 int match = -1;
104 int fd = open(ce->name, O_RDONLY);
105 if (fd >= 0) {
107 unsigned char sha1[20];
108 if (!index_fd(sha1, fd, st, 0, NULL))
109 match = memcmp(sha1, ce->sha1, 20);
110 close(fd);
111 }
112 return match;
113}
114static int compare_link(struct cache_entry *ce, unsigned long expected_size)
116{
117 int match = -1;
118 char *target;
119 void *buffer;
120 unsigned long size;
121 char type[10];
122 int len;
123 target = xmalloc(expected_size);
125 len = readlink(ce->name, target, expected_size);
126 if (len != expected_size) {
127 free(target);
128 return -1;
129 }
130 buffer = read_sha1_file(ce->sha1, type, &size);
131 if (!buffer) {
132 free(target);
133 return -1;
134 }
135 if (size == expected_size)
136 match = memcmp(buffer, target, size);
137 free(buffer);
138 free(target);
139 return match;
140}
141/*
143 * "refresh" does not calculate a new sha1 file or bring the
144 * cache up-to-date for mode/content changes. But what it
145 * _does_ do is to "re-match" the stat information of a file
146 * with the cache, so that you can refresh the cache for a
147 * file that hasn't been changed but where the stat entry is
148 * out of date.
149 *
150 * For example, you'd want to do this after doing a "git-read-tree",
151 * to link up the stat cache details with the proper files.
152 */
153static struct cache_entry *refresh_entry(struct cache_entry *ce)
154{
155 struct stat st;
156 struct cache_entry *updated;
157 int changed, size;
158 if (lstat(ce->name, &st) < 0)
160 return ERR_PTR(-errno);
161 changed = ce_match_stat(ce, &st);
163 if (!changed)
164 return ce;
165 /*
167 * If the mode or type has changed, there's no point in trying
168 * to refresh the entry - it's not going to match
169 */
170 if (changed & (MODE_CHANGED | TYPE_CHANGED))
171 return ERR_PTR(-EINVAL);
172 switch (st.st_mode & S_IFMT) {
174 case S_IFREG:
175 if (compare_data(ce, &st))
176 return ERR_PTR(-EINVAL);
177 break;
178 case S_IFLNK:
179 if (compare_link(ce, st.st_size))
180 return ERR_PTR(-EINVAL);
181 break;
182 default:
183 return ERR_PTR(-EINVAL);
184 }
185 size = ce_size(ce);
187 updated = xmalloc(size);
188 memcpy(updated, ce, size);
189 fill_stat_cache_info(updated, &st);
190 return updated;
191}
192static int refresh_cache(void)
194{
195 int i;
196 int has_errors = 0;
197 for (i = 0; i < active_nr; i++) {
199 struct cache_entry *ce, *new;
200 ce = active_cache[i];
201 if (ce_stage(ce)) {
202 printf("%s: needs merge\n", ce->name);
203 has_errors = 1;
204 while ((i < active_nr) &&
205 ! strcmp(active_cache[i]->name, ce->name))
206 i++;
207 i--;
208 continue;
209 }
210 new = refresh_entry(ce);
212 if (IS_ERR(new)) {
213 if (not_new && PTR_ERR(new) == -ENOENT)
214 continue;
215 if (quiet)
216 continue;
217 printf("%s: needs update\n", ce->name);
218 has_errors = 1;
219 continue;
220 }
221 active_cache_changed = 1;
222 /* You can NOT just free active_cache[i] here, since it
223 * might not be necessarily malloc()ed but can also come
224 * from mmap(). */
225 active_cache[i] = new;
226 }
227 return has_errors;
228}
229/*
231 * We fundamentally don't like some paths: we don't want
232 * dot or dot-dot anywhere, and for obvious reasons don't
233 * want to recurse into ".git" either.
234 *
235 * Also, we don't want double slashes or slashes at the
236 * end that can make pathnames ambiguous.
237 */
238static int verify_dotfile(const char *rest)
239{
240 /*
241 * The first character was '.', but that
242 * has already been discarded, we now test
243 * the rest.
244 */
245 switch (*rest) {
246 /* "." is not allowed */
247 case '\0': case '/':
248 return 0;
249 /*
251 * ".git" followed by NUL or slash is bad. This
252 * shares the path end test with the ".." case.
253 */
254 case 'g':
255 if (rest[1] != 'i')
256 break;
257 if (rest[2] != 't')
258 break;
259 rest += 2;
260 /* fallthrough */
261 case '.':
262 if (rest[1] == '\0' || rest[1] == '/')
263 return 0;
264 }
265 return 1;
266}
267static int verify_path(char *path)
269{
270 char c;
271 goto inside;
273 for (;;) {
274 if (!c)
275 return 1;
276 if (c == '/') {
277inside:
278 c = *path++;
279 switch (c) {
280 default:
281 continue;
282 case '/': case '\0':
283 break;
284 case '.':
285 if (verify_dotfile(path))
286 continue;
287 }
288 return 0;
289 }
290 c = *path++;
291 }
292}
293static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
295{
296 int size, len, option;
297 unsigned int mode;
298 unsigned char sha1[20];
299 struct cache_entry *ce;
300 if (sscanf(arg1, "%o", &mode) != 1)
302 return -1;
303 if (get_sha1_hex(arg2, sha1))
304 return -1;
305 if (!verify_path(arg3))
306 return -1;
307 len = strlen(arg3);
309 size = cache_entry_size(len);
310 ce = xmalloc(size);
311 memset(ce, 0, size);
312 memcpy(ce->sha1, sha1, 20);
314 memcpy(ce->name, arg3, len);
315 ce->ce_flags = htons(len);
316 ce->ce_mode = create_ce_mode(mode);
317 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
318 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
319 return add_cache_entry(ce, option);
320}
321static struct cache_file cache_file;
323int main(int argc, char **argv)
325{
326 int i, newfd, entries, has_errors = 0;
327 int allow_options = 1;
328 const char *prefix = setup_git_directory();
329 newfd = hold_index_file_for_update(&cache_file, get_index_file());
331 if (newfd < 0)
332 die("unable to create new cachefile");
333 entries = read_cache();
335 if (entries < 0)
336 die("cache corrupted");
337 for (i = 1 ; i < argc; i++) {
339 char *path = argv[i];
340 if (allow_options && *path == '-') {
342 if (!strcmp(path, "--")) {
343 allow_options = 0;
344 continue;
345 }
346 if (!strcmp(path, "-q")) {
347 quiet = 1;
348 continue;
349 }
350 if (!strcmp(path, "--add")) {
351 allow_add = 1;
352 continue;
353 }
354 if (!strcmp(path, "--replace")) {
355 allow_replace = 1;
356 continue;
357 }
358 if (!strcmp(path, "--remove")) {
359 allow_remove = 1;
360 continue;
361 }
362 if (!strcmp(path, "--refresh")) {
363 has_errors |= refresh_cache();
364 continue;
365 }
366 if (!strcmp(path, "--cacheinfo")) {
367 if (i+3 >= argc)
368 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
369 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
370 die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
371 i += 3;
372 continue;
373 }
374 if (!strcmp(path, "--info-only")) {
375 info_only = 1;
376 continue;
377 }
378 if (!strcmp(path, "--force-remove")) {
379 force_remove = 1;
380 continue;
381 }
382 if (!strcmp(path, "--ignore-missing")) {
384 not_new = 1;
385 continue;
386 }
387 die("unknown option %s", path);
388 }
389 path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
390 if (!verify_path(path)) {
391 fprintf(stderr, "Ignoring path %s\n", argv[i]);
392 continue;
393 }
394 if (force_remove) {
395 if (remove_file_from_cache(path))
396 die("git-update-index: --force-remove cannot remove %s", path);
397 continue;
398 }
399 if (add_file_to_cache(path))
400 die("Unable to add %s to database; maybe you want to use --add option?", path);
401 }
402 if (write_cache(newfd, active_cache, active_nr) ||
403 commit_index_file(&cache_file))
404 die("Unable to write new cachefile");
405 return has_errors ? 1 : 0;
407}