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         int fd;
  26         sprintf(cf->lockfile, "%s.lock", path);
  27         fd = open(cf->lockfile, O_RDWR | O_CREAT | O_EXCL, 0666);
  28         if (fd >=0 && !cf->next) {
  29                 cf->next = cache_file_list;
  30                 cache_file_list = cf;
  31                 signal(SIGINT, remove_lock_file_on_signal);
  32                 atexit(remove_lock_file);
  33         }
  34         return fd;
  35 }
  36
  37 int commit_index_file(struct cache_file *cf)
  38 {
  39         char indexfile[PATH_MAX];
  40         int i;
  41         strcpy(indexfile, cf->lockfile);
  42         i = strlen(indexfile) - 5; /* .lock */
  43         indexfile[i] = 0;
  44         i = rename(cf->lockfile, indexfile);
  45         cf->lockfile[0] = 0;
  46         return i;
  47 }
  48
  49 void rollback_index_file(struct cache_file *cf)
  50 {
  51         if (cf->lockfile[0])
  52                 unlink(cf->lockfile);
  53         cf->lockfile[0] = 0;
  54 }
  55