$ git clone -n https://src.fedoraproject.org/rpms/python-tables.git /var/lib/mock/f40-build-2232123-53322/root/chroot_tmpdir/scmroot/python-tables
Cloning into '/var/lib/mock/f40-build-2232123-53322/root/chroot_tmpdir/scmroot/python-tables'...
$ git fetch origin a0c1fd256a9cffd1818b6758f1cdd385ab8e2a29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-tables
 * [new ref]         a0c1fd256a9cffd1818b6758f1cdd385ab8e2a29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0c1fd2 fix sources