built-in count-objects.
[git] / index.c
1 /*
2  * Copyright (c) 2005, Junio C Hamano
3  */
4 #include <signal.h>
5 #include "cache.h"
6
7 static struct cache_file *cache_file_list;
8
9 static void remove_lock_file(void)
10 {
11         while (cache_file_list) {
12                 if (cache_file_list->lockfile[0])
13                         unlink(cache_file_list->lockfile);
14                 cache_file_list = cache_file_list->next;
15         }
16 }
17
18 static void remove_lock_file_on_signal(int signo)
19 {
20         remove_lock_file();
21         signal(SIGINT, SIG_DFL);
22         raise(signo);
23 }
24
25 int hold_index_file_for_update(struct cache_file *cf, const char *path)
26 {
27         int fd;
28         sprintf(cf->lockfile, "%s.lock", path);
29         fd = open(cf->lockfile, O_RDWR | O_CREAT | O_EXCL, 0666);
30         if (fd >=0 && !cf->next) {
31                 cf->next = cache_file_list;
32                 cache_file_list = cf;
33                 signal(SIGINT, remove_lock_file_on_signal);
34                 atexit(remove_lock_file);
35         }
36         return fd;
37 }
38
39 int commit_index_file(struct cache_file *cf)
40 {
41         char indexfile[PATH_MAX];
42         int i;
43         strcpy(indexfile, cf->lockfile);
44         i = strlen(indexfile) - 5; /* .lock */
45         indexfile[i] = 0;
46         i = rename(cf->lockfile, indexfile);
47         cf->lockfile[0] = 0;
48         return i;
49 }
50
51 void rollback_index_file(struct cache_file *cf)
52 {
53         if (cf->lockfile[0])
54                 unlink(cf->lockfile);
55         cf->lockfile[0] = 0;
56 }
57