$ git clone -n https://src.fedoraproject.org/rpms/kf5-knewstuff.git /var/lib/mock/f38-build-717018-96441/root/chroot_tmpdir/scmroot/kf5-knewstuff
Cloning into '/var/lib/mock/f38-build-717018-96441/root/chroot_tmpdir/scmroot/kf5-knewstuff'...
$ git fetch origin 4d9cc4544886f3ed2674ecbd4dd1d3ddfca117dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-knewstuff
 * [new ref]         4d9cc4544886f3ed2674ecbd4dd1d3ddfca117dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d9cc45 5.106.0