builtin-update-ref.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "builtin.h"
   4
   5 static const char git_update_ref_usage[] =
   6 "git-update-ref [-m <reason>] (-d <refname> <value> | [--no-deref] <refname> <value> [<oldval>])";
   7
   8 int cmd_update_ref(int argc, const char **argv, const char *prefix)
   9 {
  10         const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
  11         unsigned char sha1[20], oldsha1[20];
  12         int i, delete, ref_flags;
  13
  14         delete = 0;
  15         ref_flags = 0;
  16         git_config(git_default_config);
  17
  18         for (i = 1; i < argc; i++) {
  19                 if (!strcmp("-m", argv[i])) {
  20                         if (i+1 >= argc)
  21                                 usage(git_update_ref_usage);
  22                         msg = argv[++i];
  23                         if (!*msg)
  24                                 die("Refusing to perform update with empty message.");
  25                         continue;
  26                 }
  27                 if (!strcmp("-d", argv[i])) {
  28                         delete = 1;
  29                         continue;
  30                 }
  31                 if (!strcmp("--no-deref", argv[i])) {
  32                         ref_flags |= REF_NODEREF;
  33                         continue;
  34                 }
  35                 if (!refname) {
  36                         refname = argv[i];
  37                         continue;
  38                 }
  39                 if (!value) {
  40                         value = argv[i];
  41                         continue;
  42                 }
  43                 if (!oldval) {
  44                         oldval = argv[i];
  45                         continue;
  46                 }
  47         }
  48         if (!refname || !value)
  49                 usage(git_update_ref_usage);
  50
  51         if (get_sha1(value, sha1))
  52                 die("%s: not a valid SHA1", value);
  53
  54         if (delete) {
  55                 if (oldval)
  56                         usage(git_update_ref_usage);
  57                 return delete_ref(refname, sha1);
  58         }
  59
  60         hashclr(oldsha1);
  61         if (oldval && *oldval && get_sha1(oldval, oldsha1))
  62                 die("%s: not a valid old SHA1", oldval);
  63
  64         return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
  65                           ref_flags, DIE_ON_ERR);
  66 }