$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-u-ndinh1-9537-28282/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-u-ndinh1-9537-28282/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin a193367adac2d03884f3a7871e6ba834a790f121:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         a193367adac2d03884f3a7871e6ba834a790f121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a193367 bump release for test build