$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-incoming-8900-27842/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-incoming-8900-27842/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin 73d996b72fa4e07bffe061b803e5f759dd16b659:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         73d996b72fa4e07bffe061b803e5f759dd16b659 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73d996b Update changelog