$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f40-build-2146797-50889/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f40-build-2146797-50889/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin 6fcf0f1731d94f2e2aba2b3430a16d866b13e183:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         6fcf0f1731d94f2e2aba2b3430a16d866b13e183 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fcf0f1 5.91.0