builtin-pack-refs.c

   1 #include "cache.h"
   2 #include "refs.h"
   3
   4 static const char *result_path, *lock_path;
   5
   6 static void remove_lock_file(void)
   7 {
   8         if (lock_path)
   9                 unlink(lock_path);
  10 }
  11
  12 static int handle_one_ref(const char *path, const unsigned char *sha1,
  13                           int flags, void *cb_data)
  14 {
  15         FILE *refs_file = cb_data;
  16
  17         /* Do not pack the symbolic refs */
  18         if (!(flags & REF_ISSYMREF))
  19                 fprintf(refs_file, "%s %s\n", sha1_to_hex(sha1), path);
  20         return 0;
  21 }
  22
  23 int cmd_pack_refs(int argc, const char **argv, const char *prefix)
  24 {
  25         int fd;
  26         FILE *refs_file;
  27
  28         result_path = xstrdup(git_path("packed-refs"));
  29         lock_path = xstrdup(mkpath("%s.lock", result_path));
  30
  31         fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
  32         if (fd < 0)
  33                 die("unable to create new ref-pack file (%s)", strerror(errno));
  34         atexit(remove_lock_file);
  35
  36         refs_file = fdopen(fd, "w");
  37         if (!refs_file)
  38                 die("unable to create ref-pack file structure (%s)", strerror(errno));
  39         for_each_ref(handle_one_ref, refs_file);
  40         fsync(fd);
  41         fclose(refs_file);
  42         if (rename(lock_path, result_path) < 0)
  43                 die("unable to overwrite old ref-pack file (%s)", strerror(errno));
  44         lock_path = NULL;
  45         return 0;
  46 }