$ git clone -n https://src.fedoraproject.org/rpms/python-symengine.git /var/lib/mock/f41-build-61009850-6587636/root/chroot_tmpdir/scmroot/python-symengine
Cloning into '/var/lib/mock/f41-build-61009850-6587636/root/chroot_tmpdir/scmroot/python-symengine'...
$ git fetch origin f8a507f0d83f0c3e4132295c63a4aebb56920f60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-symengine
 * [new ref]         f8a507f0d83f0c3e4132295c63a4aebb56920f60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8a507f Symengine.py releases are no longer in sync with Symengine