$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-u-pcoval2-10332-28900/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10332-28900/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin 4c32693df265bc37cb6588009f3e6c285489dd9e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         4c32693df265bc37cb6588009f3e6c285489dd9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c32693 bump release for test build