$ git clone -n https://src.fedoraproject.org/rpms/ser2net.git /var/lib/mock/f42-build-side-1-3573382-46767/root/chroot_tmpdir/scmroot/ser2net
Cloning into '/var/lib/mock/f42-build-side-1-3573382-46767/root/chroot_tmpdir/scmroot/ser2net'...
$ git fetch origin d4660415bb37275deba8464783c86fa81cf26a4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ser2net
 * [new ref]         d4660415bb37275deba8464783c86fa81cf26a4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d466041 update to 4.6.5