$ git clone -n https://src.fedoraproject.org/rpms/kf5-knewstuff.git /var/lib/mock/f38-build-712926-94425/root/chroot_tmpdir/scmroot/kf5-knewstuff
Cloning into '/var/lib/mock/f38-build-712926-94425/root/chroot_tmpdir/scmroot/kf5-knewstuff'...
$ git fetch origin 99aac6196d6514bc0abee06ef03c8f1a8e0ef7b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-knewstuff
 * [new ref]         99aac6196d6514bc0abee06ef03c8f1a8e0ef7b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99aac61 5.105.0