$ git clone -n https://src.fedoraproject.org/rpms/python-scikit-learn.git /var/lib/mock/f40-build-2708580-71511/root/chroot_tmpdir/scmroot/python-scikit-learn
Cloning into '/var/lib/mock/f40-build-2708580-71511/root/chroot_tmpdir/scmroot/python-scikit-learn'...
$ git fetch origin 59e87ad9cef9bbcfe82418b460bc7177ffbc0de8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-scikit-learn
 * [new ref]         59e87ad9cef9bbcfe82418b460bc7177ffbc0de8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59e87ad Add the sources actually