$ git clone -n https://github.com/xcp-ng-rpms/varstored.git /var/lib/mock/v8.3-u-pcoval2-10596-29150/root/chroot_tmpdir/scmroot/varstored
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10596-29150/root/chroot_tmpdir/scmroot/varstored'...
$ git fetch origin e4e43fc060b78ffb5cfd469f37fbff374352164f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/varstored
 * [new ref]         e4e43fc060b78ffb5cfd469f37fbff374352164f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4e43fc bump release for test build