2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
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 "update-cache *" and suddenly having all the object
14 * files be revision controlled.
16 static int allow_add
= 0, allow_remove
= 0, not_new
= 0;
18 /* Three functions to allow overloaded pointer return; see linux/err.h */
19 static inline void *ERR_PTR(long error
)
21 return (void *) error
;
24 static inline long PTR_ERR(const void *ptr
)
29 static inline long IS_ERR(const void *ptr
)
31 return (unsigned long)ptr
> (unsigned long)-1000L;
35 * This only updates the "non-critical" parts of the directory
36 * cache, ie the parts that aren't tracked by GIT, and only used
37 * to validate the cache.
39 static void fill_stat_cache_info(struct cache_entry
*ce
, struct stat
*st
)
41 ce
->ce_ctime
.sec
= htonl(st
->st_ctime
);
42 ce
->ce_mtime
.sec
= htonl(st
->st_mtime
);
44 ce
->ce_ctime
.nsec
= htonl(st
->st_ctim
.tv_nsec
);
45 ce
->ce_mtime
.nsec
= htonl(st
->st_mtim
.tv_nsec
);
47 ce
->ce_dev
= htonl(st
->st_dev
);
48 ce
->ce_ino
= htonl(st
->st_ino
);
49 ce
->ce_uid
= htonl(st
->st_uid
);
50 ce
->ce_gid
= htonl(st
->st_gid
);
51 ce
->ce_size
= htonl(st
->st_size
);
54 static int add_file_to_cache(char *path
)
57 struct cache_entry
*ce
;
62 if (lstat(path
, &st
) < 0) {
63 if (errno
== ENOENT
|| errno
== ENOTDIR
) {
65 return remove_file_from_cache(path
);
69 namelen
= strlen(path
);
70 size
= cache_entry_size(namelen
);
73 memcpy(ce
->name
, path
, namelen
);
74 fill_stat_cache_info(ce
, &st
);
75 ce
->ce_mode
= create_ce_mode(st
.st_mode
);
76 ce
->ce_flags
= htons(namelen
);
77 switch (st
.st_mode
& S_IFMT
) {
79 fd
= open(path
, O_RDONLY
);
82 if (index_fd(ce
->sha1
, fd
, &st
) < 0)
86 target
= xmalloc(st
.st_size
+1);
87 if (readlink(path
, target
, st
.st_size
+1) != st
.st_size
) {
91 if (write_sha1_file(target
, st
.st_size
, "blob", ce
->sha1
))
98 return add_cache_entry(ce
, allow_add
);
101 static int match_data(int fd
, void *buffer
, unsigned long size
)
105 int ret
= read(fd
, compare
, sizeof(compare
));
107 if (ret
<= 0 || ret
> size
|| memcmp(buffer
, compare
, ret
))
115 static int compare_data(struct cache_entry
*ce
, unsigned long expected_size
)
118 int fd
= open(ce
->name
, O_RDONLY
);
125 buffer
= read_sha1_file(ce
->sha1
, type
, &size
);
127 if (size
== expected_size
&& !strcmp(type
, "blob"))
128 match
= match_data(fd
, buffer
, size
);
136 static int compare_link(struct cache_entry
*ce
, unsigned long expected_size
)
145 target
= xmalloc(expected_size
);
146 len
= readlink(ce
->name
, target
, expected_size
);
147 if (len
!= expected_size
) {
151 buffer
= read_sha1_file(ce
->sha1
, type
, &size
);
156 if (size
== expected_size
)
157 match
= memcmp(buffer
, target
, size
);
164 * "refresh" does not calculate a new sha1 file or bring the
165 * cache up-to-date for mode/content changes. But what it
166 * _does_ do is to "re-match" the stat information of a file
167 * with the cache, so that you can refresh the cache for a
168 * file that hasn't been changed but where the stat entry is
171 * For example, you'd want to do this after doing a "read-tree",
172 * to link up the stat cache details with the proper files.
174 static struct cache_entry
*refresh_entry(struct cache_entry
*ce
)
177 struct cache_entry
*updated
;
180 if (lstat(ce
->name
, &st
) < 0)
181 return ERR_PTR(-errno
);
183 changed
= cache_match_stat(ce
, &st
);
188 * If the mode or type has changed, there's no point in trying
189 * to refresh the entry - it's not going to match
191 if (changed
& (MODE_CHANGED
| TYPE_CHANGED
))
192 return ERR_PTR(-EINVAL
);
194 switch (st
.st_mode
& S_IFMT
) {
196 if (compare_data(ce
, st
.st_size
))
197 return ERR_PTR(-EINVAL
);
200 if (compare_link(ce
, st
.st_size
))
201 return ERR_PTR(-EINVAL
);
204 return ERR_PTR(-EINVAL
);
208 updated
= xmalloc(size
);
209 memcpy(updated
, ce
, size
);
210 fill_stat_cache_info(updated
, &st
);
214 static int refresh_cache(void)
219 for (i
= 0; i
< active_nr
; i
++) {
220 struct cache_entry
*ce
, *new;
221 ce
= active_cache
[i
];
223 printf("%s: needs merge\n", ce
->name
);
225 while ((i
< active_nr
) &&
226 ! strcmp(active_cache
[i
]->name
, ce
->name
))
232 new = refresh_entry(ce
);
234 if (!(not_new
&& PTR_ERR(new) == -ENOENT
)) {
235 printf("%s: needs update\n", ce
->name
);
240 active_cache_changed
= 1;
241 active_cache
[i
] = new;
247 * We fundamentally don't like some paths: we don't want
248 * dot or dot-dot anywhere, and in fact, we don't even want
249 * any other dot-files (.git or anything else). They
250 * are hidden, for chist sake.
252 * Also, we don't want double slashes or slashes at the
253 * end that can make pathnames ambiguous.
255 static int verify_path(char *path
)
266 if (c
!= '/' && c
!= '.' && c
!= '\0')
274 static int add_cacheinfo(char *arg1
, char *arg2
, char *arg3
)
278 unsigned char sha1
[20];
279 struct cache_entry
*ce
;
281 if (sscanf(arg1
, "%o", &mode
) != 1)
283 if (get_sha1_hex(arg2
, sha1
))
285 if (!verify_path(arg3
))
289 size
= cache_entry_size(len
);
293 memcpy(ce
->sha1
, sha1
, 20);
294 memcpy(ce
->name
, arg3
, len
);
295 ce
->ce_flags
= htons(len
);
296 ce
->ce_mode
= create_ce_mode(mode
);
297 return add_cache_entry(ce
, allow_add
);
300 static const char *lockfile_name
= NULL
;
302 static void remove_lock_file(void)
305 unlink(lockfile_name
);
308 static void remove_lock_file_on_signal(int signo
)
313 int main(int argc
, char **argv
)
315 int i
, newfd
, entries
, has_errors
= 0;
316 int allow_options
= 1;
317 static char lockfile
[MAXPATHLEN
+1];
318 const char *indexfile
= get_index_file();
320 snprintf(lockfile
, sizeof(lockfile
), "%s.lock", indexfile
);
322 newfd
= open(lockfile
, O_RDWR
| O_CREAT
| O_EXCL
, 0600);
324 die("unable to create new cachefile");
326 signal(SIGINT
, remove_lock_file_on_signal
);
327 atexit(remove_lock_file
);
328 lockfile_name
= lockfile
;
330 entries
= read_cache();
332 die("cache corrupted");
334 for (i
= 1 ; i
< argc
; i
++) {
335 char *path
= argv
[i
];
337 if (allow_options
&& *path
== '-') {
338 if (!strcmp(path
, "--")) {
342 if (!strcmp(path
, "--add")) {
346 if (!strcmp(path
, "--remove")) {
350 if (!strcmp(path
, "--refresh")) {
351 has_errors
|= refresh_cache();
354 if (!strcmp(path
, "--cacheinfo")) {
355 if (i
+3 >= argc
|| add_cacheinfo(argv
[i
+1], argv
[i
+2], argv
[i
+3]))
356 die("update-cache: --cacheinfo <mode> <sha1> <path>");
360 if (!strcmp(path
, "--force-remove")) {
362 die("update-cache: --force-remove <path>");
363 if (remove_file_from_cache(argv
[i
+1]))
364 die("update-cache: --force-remove cannot remove %s", argv
[i
+1]);
369 if (!strcmp(path
, "--ignore-missing")) {
373 die("unknown option %s", path
);
375 if (!verify_path(path
)) {
376 fprintf(stderr
, "Ignoring path %s\n", argv
[i
]);
379 if (add_file_to_cache(path
))
380 die("Unable to add %s to database", path
);
382 if (write_cache(newfd
, active_cache
, active_nr
) || rename(lockfile
, indexfile
))
383 die("Unable to write new cachefile");
385 lockfile_name
= NULL
;
386 return has_errors
? 1 : 0;