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, *oldval, *msg = NULL;
  15         unsigned char sha1[20], oldsha1[20];
  16         int delete = 0, no_deref = 0, flags = 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, NULL);
  26         argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
  27                              0);
  28         if (msg && !*msg)
  29                 die("Refusing to perform update with empty message.");
  30
  31         if (delete) {
  32                 if (argc < 1 || argc > 2)
  33                         usage_with_options(git_update_ref_usage, options);
  34                 refname = argv[0];
  35                 oldval = argv[1];
  36         } else {
  37                 const char *value;
  38                 if (argc < 2 || argc > 3)
  39                         usage_with_options(git_update_ref_usage, options);
  40                 refname = argv[0];
  41                 value = argv[1];
  42                 oldval = argv[2];
  43                 if (get_sha1(value, sha1))
  44                         die("%s: not a valid SHA1", value);
  45         }
  46
  47         hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
  48         if (oldval && *oldval && get_sha1(oldval, oldsha1))
  49                 die("%s: not a valid old SHA1", oldval);
  50
  51         if (no_deref)
  52                 flags = REF_NODEREF;
  53         if (delete)
  54                 return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
  55         else
  56                 return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
  57                                   flags, DIE_ON_ERR);
  58 }