$ git clone -n https://src.fedoraproject.org/rpms/libkscreen.git /var/lib/mock/f40-build-784812-133588/root/chroot_tmpdir/scmroot/libkscreen
Cloning into '/var/lib/mock/f40-build-784812-133588/root/chroot_tmpdir/scmroot/libkscreen'...
$ git fetch origin 67fe974de3d125714d98f07a1636d2f346decc04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkscreen
 * [new ref]         67fe974de3d125714d98f07a1636d2f346decc04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67fe974 6.0.0