$ git clone -n https://src.fedoraproject.org/rpms/python-sqlalchemy.git /var/lib/mock/f42-build-side-1-3499864-45966/root/chroot_tmpdir/scmroot/python-sqlalchemy
Cloning into '/var/lib/mock/f42-build-side-1-3499864-45966/root/chroot_tmpdir/scmroot/python-sqlalchemy'...
$ git fetch origin 832b63e133242eeb396c8287e3a8cae890f42e05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-sqlalchemy
 * [new ref]         832b63e133242eeb396c8287e3a8cae890f42e05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 832b63e Update to 2.0.40