$ git clone -n https://src.fedoraproject.org/rpms/mininet.git /var/lib/mock/f38-build-719888-97316/root/chroot_tmpdir/scmroot/mininet
Cloning into '/var/lib/mock/f38-build-719888-97316/root/chroot_tmpdir/scmroot/mininet'...
$ git fetch origin 529353f305e3e220911a837593b3ea59d1a46702:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mininet
 * [new ref]         529353f305e3e220911a837593b3ea59d1a46702 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 529353f Update to 2.3.1b2