builtin-pack-refs.c

   1 #include "cache.h"
   2 #include "refs.h"
   3
   4 static FILE *refs_file;
   5 static const char *result_path, *lock_path;
   6
   7 static void remove_lock_file(void)
   8 {
   9         if (lock_path)
  10                 unlink(lock_path);
  11 }
  12
  13 static int handle_one_ref(const char *path, const unsigned char *sha1)
  14 {
  15         fprintf(refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  16         return 0;
  17 }
  18
  19 int cmd_pack_refs(int argc, const char **argv, const char *prefix)
  20 {
  21         int fd;
  22
  23         result_path = xstrdup(git_path("packed-refs"));
  24         lock_path = xstrdup(mkpath("%s.lock", result_path));
  25
  26         fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
  27         if (fd < 0)
  28                 die("unable to create new ref-pack file (%s)", strerror(errno));
  29         atexit(remove_lock_file);
  30
  31         refs_file = fdopen(fd, "w");
  32         if (!refs_file)
  33                 die("unable to create ref-pack file structure (%s)", strerror(errno));
  34         for_each_ref(handle_one_ref);
  35         fsync(fd);
  36         fclose(refs_file);
  37         if (rename(lock_path, result_path) < 0)
  38                 die("unable to overwrite old ref-pack file (%s)", strerror(errno));
  39         lock_path = NULL;
  40         return 0;
  41 }