$ git clone -n https://src.fedoraproject.org/rpms/FlightGear-Atlas.git /var/lib/mock/f38-build-side-42-init-devel-584736-26106/root/chroot_tmpdir/scmroot/FlightGear-Atlas
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-584736-26106/root/chroot_tmpdir/scmroot/FlightGear-Atlas'...
$ git fetch origin bef4800cb0254f3e84f0f030541c5496aa09567c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/FlightGear-Atlas
 * [new ref]         bef4800cb0254f3e84f0f030541c5496aa09567c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bef4800 rebuild with newer SimGear