builtin-update-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "builtin.h"
   4 #include "parse-options.h"
   5
   6 static const char * const git_update_ref_usage[] = {
   7         "git-update-ref [options] -d <refname> <oldval>",
   8         "git-update-ref [options]    <refname> <newval> [<oldval>]",
   9         NULL
  10 };
  11
  12 int cmd_update_ref(int argc, const char **argv, const char *prefix)
  13 {
  14         const char *refname, *value, *oldval, *msg=NULL;
  15         unsigned char sha1[20], oldsha1[20];
  16         int delete = 0, no_deref = 0;
  17         struct option options[] = {
  18                 OPT_STRING( 'm', NULL, &msg, "reason", "reason of the update"),
  19                 OPT_BOOLEAN('d', NULL, &delete, "deletes the reference"),
  20                 OPT_BOOLEAN( 0 , "no-deref", &no_deref,
  21                                         "update <refname> not the one it points to"),
  22                 OPT_END(),
  23         };
  24
  25         git_config(git_default_config);
  26         argc = parse_options(argc, argv, options, git_update_ref_usage, 0);
  27         if (msg && !*msg)
  28                 die("Refusing to perform update with empty message.");
  29
  30         if (argc < 2 || argc > 3)
  31                 usage_with_options(git_update_ref_usage, options);
  32         refname = argv[0];
  33         value   = argv[1];
  34         oldval  = argv[2];
  35
  36         if (get_sha1(value, sha1))
  37                 die("%s: not a valid SHA1", value);
  38
  39         if (delete) {
  40                 if (oldval)
  41                         usage_with_options(git_update_ref_usage, options);
  42                 return delete_ref(refname, sha1);
  43         }
  44
  45         hashclr(oldsha1);
  46         if (oldval && *oldval && get_sha1(oldval, oldsha1))
  47                 die("%s: not a valid old SHA1", oldval);
  48
  49         return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
  50                           no_deref ? REF_NODEREF : 0, DIE_ON_ERR);
  51 }