1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7#include "strbuf.h"
8/*
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 "git-update-index *" and suddenly having all the object
14 * files be revision controlled.
15 */
16static int allow_add = 0, allow_remove = 0, allow_replace = 0, allow_unmerged = 0, not_new = 0, quiet = 0, info_only = 0;
17static int force_remove;
18/* Three functions to allow overloaded pointer return; see linux/err.h */
20static inline void *ERR_PTR(long error)
21{
22 return (void *) error;
23}
24static inline long PTR_ERR(const void *ptr)
26{
27 return (long) ptr;
28}
29static inline long IS_ERR(const void *ptr)
31{
32 return (unsigned long)ptr > (unsigned long)-1000L;
33}
34static int add_file_to_cache(const char *path)
36{
37 int size, namelen, option, status;
38 struct cache_entry *ce;
39 struct stat st;
40 int fd;
41 char *target;
42 status = lstat(path, &st);
44 if (status < 0 || S_ISDIR(st.st_mode)) {
45 /* When we used to have "path" and now we want to add
46 * "path/file", we need a way to remove "path" before
47 * being able to add "path/file". However,
48 * "git-update-index --remove path" would not work.
49 * --force-remove can be used but this is more user
50 * friendly, especially since we can do the opposite
51 * case just fine without --force-remove.
52 */
53 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
54 if (allow_remove) {
55 if (remove_file_from_cache(path))
56 return error("%s: cannot remove from the index",
57 path);
58 else
59 return 0;
60 } else if (status < 0) {
61 return error("%s: does not exist and --remove not passed",
62 path);
63 }
64 }
65 if (0 == status)
66 return error("%s: is a directory - add files inside instead",
67 path);
68 else
69 return error("lstat(\"%s\"): %s", path,
70 strerror(errno));
71 }
72 namelen = strlen(path);
73 size = cache_entry_size(namelen);
74 ce = xmalloc(size);
75 memset(ce, 0, size);
76 memcpy(ce->name, path, namelen);
77 fill_stat_cache_info(ce, &st);
78 ce->ce_mode = create_ce_mode(st.st_mode);
79 ce->ce_flags = htons(namelen);
80 switch (st.st_mode & S_IFMT) {
81 case S_IFREG:
82 fd = open(path, O_RDONLY);
83 if (fd < 0)
84 return error("open(\"%s\"): %s", path, strerror(errno));
85 if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
86 return error("%s: failed to insert into database", path);
87 break;
88 case S_IFLNK:
89 target = xmalloc(st.st_size+1);
90 if (readlink(path, target, st.st_size+1) != st.st_size) {
91 char *errstr = strerror(errno);
92 free(target);
93 return error("readlink(\"%s\"): %s", path,
94 errstr);
95 }
96 if (info_only) {
97 unsigned char hdr[50];
98 int hdrlen;
99 write_sha1_file_prepare(target, st.st_size, "blob",
100 ce->sha1, hdr, &hdrlen);
101 } else if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
102 return error("%s: failed to insert into database", path);
103 free(target);
104 break;
105 default:
106 return error("%s: unsupported file type", path);
107 }
108 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
109 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
110 if (add_cache_entry(ce, option))
111 return error("%s: cannot add to the index - missing --add option?",
112 path);
113 return 0;
114}
115/*
117 * "refresh" does not calculate a new sha1 file or bring the
118 * cache up-to-date for mode/content changes. But what it
119 * _does_ do is to "re-match" the stat information of a file
120 * with the cache, so that you can refresh the cache for a
121 * file that hasn't been changed but where the stat entry is
122 * out of date.
123 *
124 * For example, you'd want to do this after doing a "git-read-tree",
125 * to link up the stat cache details with the proper files.
126 */
127static struct cache_entry *refresh_entry(struct cache_entry *ce)
128{
129 struct stat st;
130 struct cache_entry *updated;
131 int changed, size;
132 if (lstat(ce->name, &st) < 0)
134 return ERR_PTR(-errno);
135 changed = ce_match_stat(ce, &st);
137 if (!changed)
138 return NULL;
139 if (ce_modified(ce, &st))
141 return ERR_PTR(-EINVAL);
142 size = ce_size(ce);
144 updated = xmalloc(size);
145 memcpy(updated, ce, size);
146 fill_stat_cache_info(updated, &st);
147 return updated;
148}
149static int refresh_cache(void)
151{
152 int i;
153 int has_errors = 0;
154 for (i = 0; i < active_nr; i++) {
156 struct cache_entry *ce, *new;
157 ce = active_cache[i];
158 if (ce_stage(ce)) {
159 while ((i < active_nr) &&
160 ! strcmp(active_cache[i]->name, ce->name))
161 i++;
162 i--;
163 if (allow_unmerged)
164 continue;
165 printf("%s: needs merge\n", ce->name);
166 has_errors = 1;
167 continue;
168 }
169 new = refresh_entry(ce);
171 if (!new)
172 continue;
173 if (IS_ERR(new)) {
174 if (not_new && PTR_ERR(new) == -ENOENT)
175 continue;
176 if (quiet)
177 continue;
178 printf("%s: needs update\n", ce->name);
179 has_errors = 1;
180 continue;
181 }
182 active_cache_changed = 1;
183 /* You can NOT just free active_cache[i] here, since it
184 * might not be necessarily malloc()ed but can also come
185 * from mmap(). */
186 active_cache[i] = new;
187 }
188 return has_errors;
189}
190/*
192 * We fundamentally don't like some paths: we don't want
193 * dot or dot-dot anywhere, and for obvious reasons don't
194 * want to recurse into ".git" either.
195 *
196 * Also, we don't want double slashes or slashes at the
197 * end that can make pathnames ambiguous.
198 */
199static int verify_dotfile(const char *rest)
200{
201 /*
202 * The first character was '.', but that
203 * has already been discarded, we now test
204 * the rest.
205 */
206 switch (*rest) {
207 /* "." is not allowed */
208 case '\0': case '/':
209 return 0;
210 /*
212 * ".git" followed by NUL or slash is bad. This
213 * shares the path end test with the ".." case.
214 */
215 case 'g':
216 if (rest[1] != 'i')
217 break;
218 if (rest[2] != 't')
219 break;
220 rest += 2;
221 /* fallthrough */
222 case '.':
223 if (rest[1] == '\0' || rest[1] == '/')
224 return 0;
225 }
226 return 1;
227}
228static int verify_path(const char *path)
230{
231 char c;
232 goto inside;
234 for (;;) {
235 if (!c)
236 return 1;
237 if (c == '/') {
238inside:
239 c = *path++;
240 switch (c) {
241 default:
242 continue;
243 case '/': case '\0':
244 break;
245 case '.':
246 if (verify_dotfile(path))
247 continue;
248 }
249 return 0;
250 }
251 c = *path++;
252 }
253}
254static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3)
256{
257 int size, len, option;
258 unsigned int mode;
259 unsigned char sha1[20];
260 struct cache_entry *ce;
261 if (sscanf(arg1, "%o", &mode) != 1)
263 return -1;
264 if (get_sha1_hex(arg2, sha1))
265 return -1;
266 if (!verify_path(arg3))
267 return -1;
268 len = strlen(arg3);
270 size = cache_entry_size(len);
271 ce = xmalloc(size);
272 memset(ce, 0, size);
273 memcpy(ce->sha1, sha1, 20);
275 memcpy(ce->name, arg3, len);
276 ce->ce_flags = htons(len);
277 ce->ce_mode = create_ce_mode(mode);
278 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
279 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
280 return add_cache_entry(ce, option);
281}
282static struct cache_file cache_file;
284static void update_one(const char *path, const char *prefix, int prefix_length)
287{
288 const char *p = prefix_path(prefix, prefix_length, path);
289 if (!verify_path(p)) {
290 fprintf(stderr, "Ignoring path %s\n", path);
291 return;
292 }
293 if (force_remove) {
294 if (remove_file_from_cache(p))
295 die("git-update-index: unable to remove %s", path);
296 return;
297 }
298 if (add_file_to_cache(p))
299 die("Unable to process file %s", path);
300}
301int main(int argc, const char **argv)
303{
304 int i, newfd, entries, has_errors = 0, line_termination = '\n';
305 int allow_options = 1;
306 int read_from_stdin = 0;
307 const char *prefix = setup_git_directory();
308 int prefix_length = prefix ? strlen(prefix) : 0;
309 newfd = hold_index_file_for_update(&cache_file, get_index_file());
311 if (newfd < 0)
312 die("unable to create new cachefile");
313 entries = read_cache();
315 if (entries < 0)
316 die("cache corrupted");
317 for (i = 1 ; i < argc; i++) {
319 const char *path = argv[i];
320 if (allow_options && *path == '-') {
322 if (!strcmp(path, "--")) {
323 allow_options = 0;
324 continue;
325 }
326 if (!strcmp(path, "-q")) {
327 quiet = 1;
328 continue;
329 }
330 if (!strcmp(path, "--add")) {
331 allow_add = 1;
332 continue;
333 }
334 if (!strcmp(path, "--replace")) {
335 allow_replace = 1;
336 continue;
337 }
338 if (!strcmp(path, "--remove")) {
339 allow_remove = 1;
340 continue;
341 }
342 if (!strcmp(path, "--unmerged")) {
343 allow_unmerged = 1;
344 continue;
345 }
346 if (!strcmp(path, "--refresh")) {
347 has_errors |= refresh_cache();
348 continue;
349 }
350 if (!strcmp(path, "--cacheinfo")) {
351 if (i+3 >= argc)
352 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
353 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
354 die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
355 i += 3;
356 continue;
357 }
358 if (!strcmp(path, "--info-only")) {
359 info_only = 1;
360 continue;
361 }
362 if (!strcmp(path, "--force-remove")) {
363 force_remove = 1;
364 continue;
365 }
366 if (!strcmp(path, "-z")) {
367 line_termination = 0;
368 continue;
369 }
370 if (!strcmp(path, "--stdin")) {
371 if (i != argc - 1)
372 die("--stdin must be at the end");
373 read_from_stdin = 1;
374 break;
375 }
376 if (!strcmp(path, "--ignore-missing")) {
377 not_new = 1;
378 continue;
379 }
380 die("unknown option %s", path);
381 }
382 update_one(path, prefix, prefix_length);
383 }
384 if (read_from_stdin) {
385 struct strbuf buf;
386 strbuf_init(&buf);
387 while (1) {
388 read_line(&buf, stdin, line_termination);
389 if (buf.eof)
390 break;
391 update_one(buf.buf, prefix, prefix_length);
392 }
393 }
394 if (active_cache_changed) {
395 if (write_cache(newfd, active_cache, active_nr) ||
396 commit_index_file(&cache_file))
397 die("Unable to write new cachefile");
398 }
399 return has_errors ? 1 : 0;
401}