$ git clone -n https://src.fedoraproject.org/rpms/python-sphinxygen.git /var/lib/mock/f40-build-2174922-51067/root/chroot_tmpdir/scmroot/python-sphinxygen
Cloning into '/var/lib/mock/f40-build-2174922-51067/root/chroot_tmpdir/scmroot/python-sphinxygen'...
$ git fetch origin b1b757d099bf6fbcadba429660f7b2bd80c13655:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-sphinxygen
 * [new ref]         b1b757d099bf6fbcadba429660f7b2bd80c13655 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1b757d Fix failing build and update to latest release