$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f40-build-2646816-66652/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f40-build-2646816-66652/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin 62370b54c0f5e97db2f28e403e06699247b19684:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         62370b54c0f5e97db2f28e403e06699247b19684 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62370b5 6.0.2