$ git clone -n https://src.fedoraproject.org/rpms/netopeer2.git /var/lib/mock/f42-build-3408474-45145/root/chroot_tmpdir/scmroot/netopeer2
Cloning into '/var/lib/mock/f42-build-3408474-45145/root/chroot_tmpdir/scmroot/netopeer2'...
$ git fetch origin b51c23b9600735799990bb3067ff6116179bf9f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/netopeer2
 * [new ref]         b51c23b9600735799990bb3067ff6116179bf9f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b51c23b New version 2.2.35