$ git clone -n https://src.fedoraproject.org/rpms/knetwalk.git /var/lib/mock/f40-build-2237451-53541/root/chroot_tmpdir/scmroot/knetwalk
Cloning into '/var/lib/mock/f40-build-2237451-53541/root/chroot_tmpdir/scmroot/knetwalk'...
$ git fetch origin b42e3548671527f52686f046d05099d6bf18b4cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/knetwalk
 * [new ref]         b42e3548671527f52686f046d05099d6bf18b4cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b42e354 24.01.90