$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f40-build-2417012-60573/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f40-build-2417012-60573/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin ecfa9c789ac17c020311d42c5da0d522a1c3105a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         ecfa9c789ac17c020311d42c5da0d522a1c3105a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ecfa9c7 Rebuild (qt6)