$ git clone -n https://src.fedoraproject.org/rpms/python-migen.git /var/lib/mock/f42-build-side-1-3585138-46902/root/chroot_tmpdir/scmroot/python-migen
Cloning into '/var/lib/mock/f42-build-side-1-3585138-46902/root/chroot_tmpdir/scmroot/python-migen'...
$ git fetch origin 9ece45443e6958185a7c64b705b0af7c7f2b74ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-migen
 * [new ref]         9ece45443e6958185a7c64b705b0af7c7f2b74ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ece454 remove tox; update to newer snapshot