$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-incoming-10291-28862/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-incoming-10291-28862/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin a7429a86a79e6d573bfc14f9067a6ad90c2cdd9e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         a7429a86a79e6d573bfc14f9067a6ad90c2cdd9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7429a8 Merge branch 'XS-8.3' into asv/rebase-290126