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#include "quote.h"
9/*
11 * Default to not allowing changes to the list of files. The
12 * tool doesn't actually care, but this makes it harder to add
13 * files to the revision control by mistake by doing something
14 * like "git-update-index *" and suddenly having all the object
15 * files be revision controlled.
16 */
17static int allow_add;
18static int allow_remove;
19static int allow_replace;
20static int allow_unmerged; /* --refresh needing merge is not error */
21static int not_new; /* --refresh not having working tree files is not error */
22static int quiet; /* --refresh needing update is not error */
23static int info_only;
24static int force_remove;
25static int verbose;
26/* Three functions to allow overloaded pointer return; see linux/err.h */
28static inline void *ERR_PTR(long error)
29{
30 return (void *) error;
31}
32static inline long PTR_ERR(const void *ptr)
34{
35 return (long) ptr;
36}
37static inline long IS_ERR(const void *ptr)
39{
40 return (unsigned long)ptr > (unsigned long)-1000L;
41}
42static void report(const char *fmt, ...)
44{
45 va_list vp;
46 if (!verbose)
48 return;
49 va_start(vp, fmt);
51 vprintf(fmt, vp);
52 putchar('\n');
53 va_end(vp);
54}
55static int add_file_to_cache(const char *path)
57{
58 int size, namelen, option, status;
59 struct cache_entry *ce;
60 struct stat st;
61 status = lstat(path, &st);
63 if (status < 0 || S_ISDIR(st.st_mode)) {
64 /* When we used to have "path" and now we want to add
65 * "path/file", we need a way to remove "path" before
66 * being able to add "path/file". However,
67 * "git-update-index --remove path" would not work.
68 * --force-remove can be used but this is more user
69 * friendly, especially since we can do the opposite
70 * case just fine without --force-remove.
71 */
72 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
73 if (allow_remove) {
74 if (remove_file_from_cache(path))
75 return error("%s: cannot remove from the index",
76 path);
77 else
78 return 0;
79 } else if (status < 0) {
80 return error("%s: does not exist and --remove not passed",
81 path);
82 }
83 }
84 if (0 == status)
85 return error("%s: is a directory - add files inside instead",
86 path);
87 else
88 return error("lstat(\"%s\"): %s", path,
89 strerror(errno));
90 }
91 namelen = strlen(path);
93 size = cache_entry_size(namelen);
94 ce = xmalloc(size);
95 memset(ce, 0, size);
96 memcpy(ce->name, path, namelen);
97 fill_stat_cache_info(ce, &st);
98 ce->ce_mode = create_ce_mode(st.st_mode);
100 if (!trust_executable_bit) {
101 /* If there is an existing entry, pick the mode bits
102 * from it.
103 */
104 int pos = cache_name_pos(path, namelen);
105 if (0 <= pos)
106 ce->ce_mode = active_cache[pos]->ce_mode;
107 }
108 ce->ce_flags = htons(namelen);
109 if (index_path(ce->sha1, path, &st, !info_only))
111 return -1;
112 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
113 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
114 if (add_cache_entry(ce, option))
115 return error("%s: cannot add to the index - missing --add option?",
116 path);
117 return 0;
118}
119/*
121 * "refresh" does not calculate a new sha1 file or bring the
122 * cache up-to-date for mode/content changes. But what it
123 * _does_ do is to "re-match" the stat information of a file
124 * with the cache, so that you can refresh the cache for a
125 * file that hasn't been changed but where the stat entry is
126 * out of date.
127 *
128 * For example, you'd want to do this after doing a "git-read-tree",
129 * to link up the stat cache details with the proper files.
130 */
131static struct cache_entry *refresh_entry(struct cache_entry *ce)
132{
133 struct stat st;
134 struct cache_entry *updated;
135 int changed, size;
136 if (lstat(ce->name, &st) < 0)
138 return ERR_PTR(-errno);
139 changed = ce_match_stat(ce, &st);
141 if (!changed)
142 return NULL;
143 if (ce_modified(ce, &st))
145 return ERR_PTR(-EINVAL);
146 size = ce_size(ce);
148 updated = xmalloc(size);
149 memcpy(updated, ce, size);
150 fill_stat_cache_info(updated, &st);
151 return updated;
152}
153static int refresh_cache(void)
155{
156 int i;
157 int has_errors = 0;
158 for (i = 0; i < active_nr; i++) {
160 struct cache_entry *ce, *new;
161 ce = active_cache[i];
162 if (ce_stage(ce)) {
163 while ((i < active_nr) &&
164 ! strcmp(active_cache[i]->name, ce->name))
165 i++;
166 i--;
167 if (allow_unmerged)
168 continue;
169 printf("%s: needs merge\n", ce->name);
170 has_errors = 1;
171 continue;
172 }
173 new = refresh_entry(ce);
175 if (!new)
176 continue;
177 if (IS_ERR(new)) {
178 if (not_new && PTR_ERR(new) == -ENOENT)
179 continue;
180 if (quiet)
181 continue;
182 printf("%s: needs update\n", ce->name);
183 has_errors = 1;
184 continue;
185 }
186 active_cache_changed = 1;
187 /* You can NOT just free active_cache[i] here, since it
188 * might not be necessarily malloc()ed but can also come
189 * from mmap(). */
190 active_cache[i] = new;
191 }
192 return has_errors;
193}
194/*
196 * We fundamentally don't like some paths: we don't want
197 * dot or dot-dot anywhere, and for obvious reasons don't
198 * want to recurse into ".git" either.
199 *
200 * Also, we don't want double slashes or slashes at the
201 * end that can make pathnames ambiguous.
202 */
203static int verify_dotfile(const char *rest)
204{
205 /*
206 * The first character was '.', but that
207 * has already been discarded, we now test
208 * the rest.
209 */
210 switch (*rest) {
211 /* "." is not allowed */
212 case '\0': case '/':
213 return 0;
214 /*
216 * ".git" followed by NUL or slash is bad. This
217 * shares the path end test with the ".." case.
218 */
219 case 'g':
220 if (rest[1] != 'i')
221 break;
222 if (rest[2] != 't')
223 break;
224 rest += 2;
225 /* fallthrough */
226 case '.':
227 if (rest[1] == '\0' || rest[1] == '/')
228 return 0;
229 }
230 return 1;
231}
232static int verify_path(const char *path)
234{
235 char c;
236 goto inside;
238 for (;;) {
239 if (!c)
240 return 1;
241 if (c == '/') {
242inside:
243 c = *path++;
244 switch (c) {
245 default:
246 continue;
247 case '/': case '\0':
248 break;
249 case '.':
250 if (verify_dotfile(path))
251 continue;
252 }
253 return 0;
254 }
255 c = *path++;
256 }
257}
258static int add_cacheinfo(const char *arg1, const char *arg2, const char *arg3)
260{
261 int size, len, option;
262 unsigned int mode;
263 unsigned char sha1[20];
264 struct cache_entry *ce;
265 if (sscanf(arg1, "%o", &mode) != 1)
267 return -1;
268 if (get_sha1_hex(arg2, sha1))
269 return -1;
270 if (!verify_path(arg3))
271 return -1;
272 len = strlen(arg3);
274 size = cache_entry_size(len);
275 ce = xmalloc(size);
276 memset(ce, 0, size);
277 memcpy(ce->sha1, sha1, 20);
279 memcpy(ce->name, arg3, len);
280 ce->ce_flags = htons(len);
281 ce->ce_mode = create_ce_mode(mode);
282 option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
283 option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
284 if (add_cache_entry(ce, option))
285 return error("%s: cannot add to the index - missing --add option?",
286 arg3);
287 report("add '%s'", arg3);
288 return 0;
289}
290static int chmod_path(int flip, const char *path)
292{
293 int pos;
294 struct cache_entry *ce;
295 unsigned int mode;
296 pos = cache_name_pos(path, strlen(path));
298 if (pos < 0)
299 return -1;
300 ce = active_cache[pos];
301 mode = ntohl(ce->ce_mode);
302 if (!S_ISREG(mode))
303 return -1;
304 switch (flip) {
305 case '+':
306 ce->ce_mode |= htonl(0111); break;
307 case '-':
308 ce->ce_mode &= htonl(~0111); break;
309 default:
310 return -1;
311 }
312 active_cache_changed = 1;
313 return 0;
314}
315static struct cache_file cache_file;
317static void update_one(const char *path, const char *prefix, int prefix_length)
319{
320 const char *p = prefix_path(prefix, prefix_length, path);
321 if (!verify_path(p)) {
322 fprintf(stderr, "Ignoring path %s\n", path);
323 return;
324 }
325 if (force_remove) {
326 if (remove_file_from_cache(p))
327 die("git-update-index: unable to remove %s", path);
328 report("remove '%s'", path);
329 return;
330 }
331 if (add_file_to_cache(p))
332 die("Unable to process file %s", path);
333 report("add '%s'", path);
334}
335static void read_index_info(int line_termination)
337{
338 struct strbuf buf;
339 strbuf_init(&buf);
340 while (1) {
341 char *ptr;
342 char *path_name;
343 unsigned char sha1[20];
344 unsigned int mode;
345 read_line(&buf, stdin, line_termination);
347 if (buf.eof)
348 break;
349 mode = strtoul(buf.buf, &ptr, 8);
351 if (ptr == buf.buf || *ptr != ' ' ||
352 get_sha1_hex(ptr + 1, sha1) ||
353 ptr[41] != '\t')
354 goto bad_line;
355 ptr += 42;
357 if (line_termination && ptr[0] == '"')
359 path_name = unquote_c_style(ptr, NULL);
360 else
361 path_name = ptr;
362 if (!verify_path(path_name)) {
364 fprintf(stderr, "Ignoring path %s\n", path_name);
365 if (path_name != ptr)
366 free(path_name);
367 continue;
368 }
369 if (!mode) {
371 /* mode == 0 means there is no such path -- remove */
372 if (remove_file_from_cache(path_name))
373 die("git-update-index: unable to remove %s",
374 ptr);
375 }
376 else {
377 /* mode ' ' sha1 '\t' name
378 * ptr[-1] points at tab,
379 * ptr[-41] is at the beginning of sha1
380 */
381 ptr[-42] = ptr[-1] = 0;
382 if (add_cacheinfo(buf.buf, ptr-41, path_name))
383 die("git-update-index: unable to update %s",
384 path_name);
385 }
386 if (path_name != ptr)
387 free(path_name);
388 continue;
389 bad_line:
391 die("malformed index info %s", buf.buf);
392 }
393}
394int main(int argc, const char **argv)
396{
397 int i, newfd, entries, has_errors = 0, line_termination = '\n';
398 int allow_options = 1;
399 int read_from_stdin = 0;
400 const char *prefix = setup_git_directory();
401 int prefix_length = prefix ? strlen(prefix) : 0;
402 git_config(git_default_config);
404 newfd = hold_index_file_for_update(&cache_file, get_index_file());
406 if (newfd < 0)
407 die("unable to create new cachefile");
408 entries = read_cache();
410 if (entries < 0)
411 die("cache corrupted");
412 for (i = 1 ; i < argc; i++) {
414 const char *path = argv[i];
415 if (allow_options && *path == '-') {
417 if (!strcmp(path, "--")) {
418 allow_options = 0;
419 continue;
420 }
421 if (!strcmp(path, "-q")) {
422 quiet = 1;
423 continue;
424 }
425 if (!strcmp(path, "--add")) {
426 allow_add = 1;
427 continue;
428 }
429 if (!strcmp(path, "--replace")) {
430 allow_replace = 1;
431 continue;
432 }
433 if (!strcmp(path, "--remove")) {
434 allow_remove = 1;
435 continue;
436 }
437 if (!strcmp(path, "--unmerged")) {
438 allow_unmerged = 1;
439 continue;
440 }
441 if (!strcmp(path, "--refresh")) {
442 has_errors |= refresh_cache();
443 continue;
444 }
445 if (!strcmp(path, "--cacheinfo")) {
446 if (i+3 >= argc)
447 die("git-update-index: --cacheinfo <mode> <sha1> <path>");
448 if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
449 die("git-update-index: --cacheinfo cannot add %s", argv[i+3]);
450 i += 3;
451 continue;
452 }
453 if (!strcmp(path, "--chmod=-x") ||
454 !strcmp(path, "--chmod=+x")) {
455 if (argc <= i+1)
456 die("git-update-index: %s <path>", path);
457 if (chmod_path(path[8], argv[++i]))
458 die("git-update-index: %s cannot chmod %s", path, argv[i]);
459 continue;
460 }
461 if (!strcmp(path, "--info-only")) {
462 info_only = 1;
463 continue;
464 }
465 if (!strcmp(path, "--force-remove")) {
466 force_remove = 1;
467 continue;
468 }
469 if (!strcmp(path, "-z")) {
470 line_termination = 0;
471 continue;
472 }
473 if (!strcmp(path, "--stdin")) {
474 if (i != argc - 1)
475 die("--stdin must be at the end");
476 read_from_stdin = 1;
477 break;
478 }
479 if (!strcmp(path, "--index-info")) {
480 allow_add = allow_replace = allow_remove = 1;
481 read_index_info(line_termination);
482 continue;
483 }
484 if (!strcmp(path, "--ignore-missing")) {
485 not_new = 1;
486 continue;
487 }
488 if (!strcmp(path, "--verbose")) {
489 verbose = 1;
490 continue;
491 }
492 die("unknown option %s", path);
493 }
494 update_one(path, prefix, prefix_length);
495 }
496 if (read_from_stdin) {
497 struct strbuf buf;
498 strbuf_init(&buf);
499 while (1) {
500 read_line(&buf, stdin, line_termination);
501 if (buf.eof)
502 break;
503 update_one(buf.buf, prefix, prefix_length);
504 }
505 }
506 if (active_cache_changed) {
507 if (write_cache(newfd, active_cache, active_nr) ||
508 commit_index_file(&cache_file))
509 die("Unable to write new cachefile");
510 }
511 return has_errors ? 1 : 0;
513}