$ git clone -n https://src.fedoraproject.org/rpms/kf5-kwindowsystem.git /var/lib/mock/f38-build-716492-96075/root/chroot_tmpdir/scmroot/kf5-kwindowsystem
Cloning into '/var/lib/mock/f38-build-716492-96075/root/chroot_tmpdir/scmroot/kf5-kwindowsystem'...
$ git fetch origin f958e6f39424605407da93d53f21ff47d1b617e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kwindowsystem
 * [new ref]         f958e6f39424605407da93d53f21ff47d1b617e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f958e6f 5.106.0