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 status = lstat(path, &st);
42 if (status < 0 || S_ISDIR(st.st_mode)) {
43 /* When we used to have "path" and now we want to add
44 * "path/file", we need a way to remove "path" before
45 * being able to add "path/file". However,
46 * "git-update-index --remove path" would not work.
47 * --force-remove can be used but this is more user
48 * friendly, especially since we can do the opposite
49 * case just fine without --force-remove.
50 */
51 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
52 if (allow_remove) {
53 if (remove_file_from_cache(path))
54 return error("%s: cannot remove from the index",
55 path);
56 else
57 return 0;
58 } else if (status < 0) {
59 return error("%s: does not exist and --remove not passed",
60 path);
61 }
62 }
63 if (0 == status)
64 return error("%s: is a directory - add files inside instead",
65 path);
66 else
67 return error("lstat(\"%s\"): %s", path,
68 strerror(errno));
69 }
70 namelen = strlen(path);
72 size = cache_entry_size(namelen);
73 ce = xmalloc(size);
74 memset(ce, 0, size);
75 memcpy(ce->name, path, namelen);
76 fill_stat_cache_info(ce, &st);
77 ce->ce_mode = create_ce_mode(st.st_mode);
79 if (!trust_executable_bit) {
80 /* If there is an existing entry, pick the mode bits
81 * from it.
82 */
83 int pos = cache_name_pos(path, namelen);
84 if (0 <= pos)
85 ce->ce_mode = active_cache[pos]->ce_mode;
86 }
87 ce->ce_flags = htons(namelen);
88 if (index_path(ce->sha1, path, &st, !info_only))
90 return -1;
91 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
92 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
93 if (add_cache_entry(ce, option))
94 return error("%s: cannot add to the index - missing --add option?",
95 path);
96 return 0;
97}
98/*
100 * "refresh" does not calculate a new sha1 file or bring the
101 * cache up-to-date for mode/content changes. But what it
102 * _does_ do is to "re-match" the stat information of a file
103 * with the cache, so that you can refresh the cache for a
104 * file that hasn't been changed but where the stat entry is
105 * out of date.
106 *
107 * For example, you'd want to do this after doing a "git-read-tree",
108 * to link up the stat cache details with the proper files.
109 */
110static struct cache_entry *refresh_entry(struct cache_entry *ce)
111{
112 struct stat st;
113 struct cache_entry *updated;
114 int changed, size;
115 if (lstat(ce->name, &st) < 0)
117 return ERR_PTR(-errno);
118 changed = ce_match_stat(ce, &st);
120 if (!changed)
121 return NULL;
122 if (ce_modified(ce, &st))
124 return ERR_PTR(-EINVAL);
125 size = ce_size(ce);
127 updated = xmalloc(size);
128 memcpy(updated, ce, size);
129 fill_stat_cache_info(updated, &st);
130 return updated;
131}
132static int refresh_cache(void)
134{
135 int i;
136 int has_errors = 0;
137 for (i = 0; i < active_nr; i++) {
139 struct cache_entry *ce, *new;
140 ce = active_cache[i];
141 if (ce_stage(ce)) {
142 while ((i < active_nr) &&
143 ! strcmp(active_cache[i]->name, ce->name))
144 i++;
145 i--;
146 if (allow_unmerged)
147 continue;
148 printf("%s: needs merge\n", ce->name);
149 has_errors = 1;
150 continue;
151 }
152 new = refresh_entry(ce);
154 if (!new)
155 continue;
156 if (IS_ERR(new)) {
157 if (not_new && PTR_ERR(new) == -ENOENT)
158 continue;
159 if (quiet)
160 continue;
161 printf("%s: needs update\n", ce->name);
162 has_errors = 1;
163 continue;
164 }
165 active_cache_changed = 1;
166 /* You can NOT just free active_cache[i] here, since it
167 * might not be necessarily malloc()ed but can also come
168 * from mmap(). */
169 active_cache[i] = new;
170 }
171 return has_errors;
172}
173/*
175 * We fundamentally don't like some paths: we don't want
176 * dot or dot-dot anywhere, and for obvious reasons don't
177 * want to recurse into ".git" either.
178 *
179 * Also, we don't want double slashes or slashes at the
180 * end that can make pathnames ambiguous.
181 */
182static int verify_dotfile(const char *rest)
183{
184 /*
185 * The first character was '.', but that
186 * has already been discarded, we now test
187 * the rest.
188 */
189 switch (*rest) {
190 /* "." is not allowed */
191 case '\0': case '/':
192 return 0;
193 /*
195 * ".git" followed by NUL or slash is bad. This
196 * shares the path end test with the ".." case.
197 */
198 case 'g':
199 if (rest[1] != 'i')
200 break;
201 if (rest[2] != 't')
202 break;
203 rest += 2;
204 /* fallthrough */
205 case '.':
206 if (rest[1] == '\0' || rest[1] == '/')
207 return 0;
208 }
209 return 1;
210}
211static int verify_path(const char *path)
213{
214 char c;
215 goto inside;
217 for (;;) {
218 if (!c)
219 return 1;
220 if (c == '/') {
221inside:
222 c = *path++;
223 switch (c) {
224 default:
225 continue;
226 case '/': case '\0':
227 break;
228 case '.':
229 if (verify_dotfile(path))
230 continue;
231 }
232 return 0;
233 }
234 c = *path++;
235 }
236}
237static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3)
239{
240 int size, len, option;
241 unsigned int mode;
242 unsigned char sha1[20];
243 struct cache_entry *ce;
244 if (sscanf(arg1, "%o", &mode) != 1)
246 return -1;
247 if (get_sha1_hex(arg2, sha1))
248 return -1;
249 if (!verify_path(arg3))
250 return -1;
251 len = strlen(arg3);
253 size = cache_entry_size(len);
254 ce = xmalloc(size);
255 memset(ce, 0, size);
256 memcpy(ce->sha1, sha1, 20);
258 memcpy(ce->name, arg3, len);
259 ce->ce_flags = htons(len);
260 ce->ce_mode = create_ce_mode(mode);
261 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
262 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
263 return add_cache_entry(ce, option);
264}
265static int chmod_path(int flip, const char *path)
267{
268 int pos;
269 struct cache_entry *ce;
270 unsigned int mode;
271 pos = cache_name_pos(path, strlen(path));
273 if (pos < 0)
274 return -1;
275 ce = active_cache[pos];
276 mode = ntohl(ce->ce_mode);
277 if (!S_ISREG(mode))
278 return -1;
279 switch (flip) {
280 case '+':
281 ce->ce_mode |= htonl(0111); break;
282 case '-':
283 ce->ce_mode &= htonl(~0111); break;
284 default:
285 return -1;
286 }
287 active_cache_changed = 1;
288 return 0;
289}
290static struct cache_file cache_file;
292static void update_one(const char *path, const char *prefix, int prefix_length)
294{
295 const char *p = prefix_path(prefix, prefix_length, path);
296 if (!verify_path(p)) {
297 fprintf(stderr, "Ignoring path %s\n", path);
298 return;
299 }
300 if (force_remove) {
301 if (remove_file_from_cache(p))
302 die("git-update-index: unable to remove %s", path);
303 return;
304 }
305 if (add_file_to_cache(p))
306 die("Unable to process file %s", path);
307}
308static void read_index_info(int line_termination)
310{
311 struct strbuf buf;
312 strbuf_init(&buf);
313 while (1) {
314 char *ptr;
315 unsigned char sha1[20];
316 unsigned int mode;
317 read_line(&buf, stdin, line_termination);
319 if (buf.eof)
320 break;
321 mode = strtoul(buf.buf, &ptr, 8);
323 if (ptr == buf.buf || *ptr != ' ' ||
324 get_sha1_hex(ptr + 1, sha1) ||
325 ptr[41] != '\t')
326 goto bad_line;
327 ptr += 42;
329 if (!verify_path(ptr)) {
330 fprintf(stderr, "Ignoring path %s\n", ptr);
331 continue;
332 }
333 if (!mode) {
335 /* mode == 0 means there is no such path -- remove */
336 if (remove_file_from_cache(ptr))
337 die("git-update-index: unable to remove %s",
338 ptr);
339 }
340 else {
341 /* mode ' ' sha1 '\t' name
342 * ptr[-1] points at tab,
343 * ptr[-41] is at the beginning of sha1
344 */
345 ptr[-42] = ptr[-1] = 0;
346 if (add_cacheinfo(buf.buf, ptr-41, ptr))
347 die("git-update-index: unable to update %s",
348 ptr);
349 }
350 continue;
351 bad_line:
353 die("malformed index info %s", buf.buf);
354 }
355}
356int main(int argc, const char **argv)
358{
359 int i, newfd, entries, has_errors = 0, line_termination = '\n';
360 int allow_options = 1;
361 int read_from_stdin = 0;
362 const char *prefix = setup_git_directory();
363 int prefix_length = prefix ? strlen(prefix) : 0;
364 git_config(git_default_config);
366 newfd = hold_index_file_for_update(&cache_file, get_index_file());
368 if (newfd < 0)
369 die("unable to create new cachefile");
370 entries = read_cache();
372 if (entries < 0)
373 die("cache corrupted");
374 for (i = 1 ; i < argc; i++) {
376 const char *path = argv[i];
377 if (allow_options && *path == '-') {
379 if (!strcmp(path, "--")) {
380 allow_options = 0;
381 continue;
382 }
383 if (!strcmp(path, "-q")) {
384 quiet = 1;
385 continue;
386 }
387 if (!strcmp(path, "--add")) {
388 allow_add = 1;
389 continue;
390 }
391 if (!strcmp(path, "--replace")) {
392 allow_replace = 1;
393 continue;
394 }
395 if (!strcmp(path, "--remove")) {
396 allow_remove = 1;
397 continue;
398 }
399 if (!strcmp(path, "--unmerged")) {
400 allow_unmerged = 1;
401 continue;
402 }
403 if (!strcmp(path, "--refresh")) {
404 has_errors |= refresh_cache();
405 continue;
406 }
407 if (!strcmp(path, "--cacheinfo")) {
408 if (i+3 >= argc)
409 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
410 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
411 die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
412 i += 3;
413 continue;
414 }
415 if (!strcmp(path, "--chmod=-x") ||
416 !strcmp(path, "--chmod=+x")) {
417 if (argc <= i+1)
418 die("git-update-index: %s <path>", path);
419 if (chmod_path(path[8], argv[++i]))
420 die("git-update-index: %s cannot chmod %s", path, argv[i]);
421 continue;
422 }
423 if (!strcmp(path, "--info-only")) {
424 info_only = 1;
425 continue;
426 }
427 if (!strcmp(path, "--force-remove")) {
428 force_remove = 1;
429 continue;
430 }
431 if (!strcmp(path, "-z")) {
432 line_termination = 0;
433 continue;
434 }
435 if (!strcmp(path, "--stdin")) {
436 if (i != argc - 1)
437 die("--stdin must be at the end");
438 read_from_stdin = 1;
439 break;
440 }
441 if (!strcmp(path, "--index-info")) {
442 allow_add = allow_replace = allow_remove = 1;
443 read_index_info(line_termination);
444 continue;
445 }
446 if (!strcmp(path, "--ignore-missing")) {
447 not_new = 1;
448 continue;
449 }
450 die("unknown option %s", path);
451 }
452 update_one(path, prefix, prefix_length);
453 }
454 if (read_from_stdin) {
455 struct strbuf buf;
456 strbuf_init(&buf);
457 while (1) {
458 read_line(&buf, stdin, line_termination);
459 if (buf.eof)
460 break;
461 update_one(buf.buf, prefix, prefix_length);
462 }
463 }
464 if (active_cache_changed) {
465 if (write_cache(newfd, active_cache, active_nr) ||
466 commit_index_file(&cache_file))
467 die("Unable to write new cachefile");
468 }
469 return has_errors ? 1 : 0;
471}