$ git clone -n https://github.com/xcp-ng-rpms/lvm2.git /var/lib/mock/v8.3-incoming-11427-29736/root/chroot_tmpdir/scmroot/lvm2
Cloning into '/var/lib/mock/v8.3-incoming-11427-29736/root/chroot_tmpdir/scmroot/lvm2'...
$ git fetch origin 9004cddd90ded63e68101b99a144ad03df00cc6f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/lvm2
 * [new ref]         9004cddd90ded63e68101b99a144ad03df00cc6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9004cdd Avoid unnecessary sysfs lookups