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

   1#include "cache.h"
   2#include "refs.h"
   3#include "builtin.h"
   4
   5static const char git_update_ref_usage[] =
   6"git-update-ref [-m <reason>] (-d <refname> <value> | [--no-deref] <refname> <value> [<oldval>])";
   7
   8int cmd_update_ref(int argc, const char **argv, const char *prefix)
   9{
  10        const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
  11        struct ref_lock *lock;
  12        unsigned char sha1[20], oldsha1[20];
  13        int i, delete, ref_flags;
  14
  15        delete = 0;
  16        ref_flags = 0;
  17        git_config(git_default_config);
  18
  19        for (i = 1; i < argc; i++) {
  20                if (!strcmp("-m", argv[i])) {
  21                        if (i+1 >= argc)
  22                                usage(git_update_ref_usage);
  23                        msg = argv[++i];
  24                        if (!*msg)
  25                                die("Refusing to perform update with empty message.");
  26                        if (strchr(msg, '\n'))
  27                                die("Refusing to perform update with \\n in message.");
  28                        continue;
  29                }
  30                if (!strcmp("-d", argv[i])) {
  31                        delete = 1;
  32                        continue;
  33                }
  34                if (!strcmp("--no-deref", argv[i])) {
  35                        ref_flags |= REF_NODEREF;
  36                        continue;
  37                }
  38                if (!refname) {
  39                        refname = argv[i];
  40                        continue;
  41                }
  42                if (!value) {
  43                        value = argv[i];
  44                        continue;
  45                }
  46                if (!oldval) {
  47                        oldval = argv[i];
  48                        continue;
  49                }
  50        }
  51        if (!refname || !value)
  52                usage(git_update_ref_usage);
  53
  54        if (get_sha1(value, sha1))
  55                die("%s: not a valid SHA1", value);
  56
  57        if (delete) {
  58                if (oldval)
  59                        usage(git_update_ref_usage);
  60                return delete_ref(refname, sha1);
  61        }
  62
  63        hashclr(oldsha1);
  64        if (oldval && *oldval && get_sha1(oldval, oldsha1))
  65                die("%s: not a valid old SHA1", oldval);
  66
  67        lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL, ref_flags);
  68        if (!lock)
  69                die("%s: cannot lock the ref", refname);
  70        if (write_ref_sha1(lock, sha1, msg) < 0)
  71                die("%s: cannot update the ref", refname);
  72        return 0;
  73}