$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-incoming-10230-28804/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-incoming-10230-28804/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin 0a567230ec96b54d3ccc31501686dffe99bb4615:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         0a567230ec96b54d3ccc31501686dffe99bb4615 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a56723 Merge pull request #11 from xcp-ng-rpms/8.3-backport-xsa478