$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace.git /var/lib/mock/f40-build-2476666-61589/root/chroot_tmpdir/scmroot/plasma-workspace
Cloning into '/var/lib/mock/f40-build-2476666-61589/root/chroot_tmpdir/scmroot/plasma-workspace'...
$ git fetch origin f79beab7973f7b8f412e6eaae543c563adc805c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace
 * [new ref]         f79beab7973f7b8f412e6eaae543c563adc805c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f79beab Fixing some package requires (With suggestions from Neal & Loise)