static double parseDiskSpacePercentage(S s) {
  L<S> l = regexpGroups("(\\d+) MB free of (\\d+) MB\\.", s);
  double ratio = 1-doubleRatio(parseInt(first(l)), parseInt(second(l)));
  l = regexpGroups("Free inodes: (\\d+)K/(\\d+)K", s);
  if (nempty(l))
    ratio = min(ratio, 1-doubleRatio(parseInt(first(l)), parseInt(second(l))));
  ret *100;
}