$ git clone -n https://src.fedoraproject.org/rpms/perl-Tie-RefHash.git /var/lib/mock/f45-build-27185-621/root/chroot_tmpdir/scmroot/perl-Tie-RefHash
Cloning into '/var/lib/mock/f45-build-27185-621/root/chroot_tmpdir/scmroot/perl-Tie-RefHash'...
$ git fetch origin 5c8fa746db70f2c7914b37d5fdd0525f8d00fdaa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tie-RefHash
 * [new ref]         5c8fa746db70f2c7914b37d5fdd0525f8d00fdaa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c8fa74 Increase release to favour standalone package