$ git clone -n https://src.fedoraproject.org/rpms/plasma-discover.git /var/lib/mock/f41-build-824403-154063/root/chroot_tmpdir/scmroot/plasma-discover
Cloning into '/var/lib/mock/f41-build-824403-154063/root/chroot_tmpdir/scmroot/plasma-discover'...
$ git fetch origin 9a4a831a39a6b1ad523a3e8886f72160c679aa04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-discover
 * [new ref]         9a4a831a39a6b1ad523a3e8886f72160c679aa04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a4a831 rebuild