$ git clone -n https://src.fedoraproject.org/rpms/python-scikit-learn.git /var/lib/mock/f40-build-2079564-49671/root/chroot_tmpdir/scmroot/python-scikit-learn
Cloning into '/var/lib/mock/f40-build-2079564-49671/root/chroot_tmpdir/scmroot/python-scikit-learn'...
$ git fetch origin 2bb36d7ba01b740158454b7623cd7e42186e00f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-scikit-learn
 * [new ref]         2bb36d7ba01b740158454b7623cd7e42186e00f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2bb36d7 Skip test faillure in i686