$ git clone -n https://src.fedoraproject.org/rpms/vfrnav.git /var/lib/mock/f40-build-771073-125911/root/chroot_tmpdir/scmroot/vfrnav
Cloning into '/var/lib/mock/f40-build-771073-125911/root/chroot_tmpdir/scmroot/vfrnav'...
$ git fetch origin d4bfc343fd344b3c71b0929f55a3e1614cd5fa8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vfrnav
 * [new ref]         d4bfc343fd344b3c71b0929f55a3e1614cd5fa8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4bfc34 Switch to BR podofo0.9-devel