$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f40-build-2087277-50154/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f40-build-2087277-50154/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin 32f0e65bdef62302145c5a327f91b033d337f685:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         32f0e65bdef62302145c5a327f91b033d337f685 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32f0e65 fix: upload missing sources