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, *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}