Merge with gitk.
[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 }
22
23 int hold_index_file_for_update(struct cache_file *cf, const char *path)
24 {
25         sprintf(cf->lockfile, "%s.lock", path);
26         cf->next = cache_file_list;
27         cache_file_list = cf;
28         if (!cf->next) {
29                 signal(SIGINT, remove_lock_file_on_signal);
30                 atexit(remove_lock_file);
31         }
32         return open(cf->lockfile, O_RDWR | O_CREAT | O_EXCL, 0600);
33 }
34
35 int commit_index_file(struct cache_file *cf)
36 {
37         char indexfile[PATH_MAX];
38         int i;
39         strcpy(indexfile, cf->lockfile);
40         i = strlen(indexfile) - 5; /* .lock */
41         indexfile[i] = 0;
42         i = rename(cf->lockfile, indexfile);
43         cf->lockfile[0] = 0;
44         return i;
45 }
46
47 void rollback_index_file(struct cache_file *cf)
48 {
49         if (cf->lockfile[0])
50                 unlink(cf->lockfile);
51         cf->lockfile[0] = 0;
52 }
53