$ git clone -n https://src.fedoraproject.org/rpms/python-migen.git /var/lib/mock/f40-build-2188216-51401/root/chroot_tmpdir/scmroot/python-migen
Cloning into '/var/lib/mock/f40-build-2188216-51401/root/chroot_tmpdir/scmroot/python-migen'...
$ git fetch origin 593340c26776c2b2fc613819d36b3587bd552699:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-migen
 * [new ref]         593340c26776c2b2fc613819d36b3587bd552699 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 593340c fix #2246280