$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-lab-9561-28308/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-lab-9561-28308/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin b0e0674a1015480d8dd6227c76b85c9cdcf4e2b2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         b0e0674a1015480d8dd6227c76b85c9cdcf4e2b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0e0674 Update version to 1.2.0-3.3