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