$ git clone -n https://github.com/xcp-ng-rpms/bind.git /var/lib/mock/v8.3-u-pcoval2-10402-28964/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10402-28964/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin 9fc2062b34cccc1ca8716469c8d483e8b415677a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/bind
 * [new ref]         9fc2062b34cccc1ca8716469c8d483e8b415677a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fc2062 bump release for test build