Andrew's git - gitweb.git/blob - builtin-update-ref.c

   1#include "cache.h"
   2#include "refs.h"
   3#include "builtin.h"
   4#include "parse-options.h"
   5
   6static 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
  12int 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, 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 (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}