$ git clone -n https://src.fedoraproject.org/rpms/python-slackclient.git /var/lib/mock/f42-build-side-1-3505134-45989/root/chroot_tmpdir/scmroot/python-slackclient
Cloning into '/var/lib/mock/f42-build-side-1-3505134-45989/root/chroot_tmpdir/scmroot/python-slackclient'...
$ git fetch origin b74adf5909d30bb2b4f9024d9b307e27557ac737:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-slackclient
 * [new ref]         b74adf5909d30bb2b4f9024d9b307e27557ac737 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b74adf5 Remove pytest-runner from build-system.requires