$ git clone -n https://src.fedoraproject.org/rpms/cjdns.git /var/lib/mock/f40-build-735280-106332/root/chroot_tmpdir/scmroot/cjdns
Cloning into '/var/lib/mock/f40-build-735280-106332/root/chroot_tmpdir/scmroot/cjdns'...
$ git fetch origin 75b1f0ea2dd27622a15e8eda74a4b6d1d65a45dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjdns
 * [new ref]         75b1f0ea2dd27622a15e8eda74a4b6d1d65a45dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75b1f0e rebuild for new libsodium