MacroBull

https://github.com/nachoparker/btrfs-du/blob/239fbb80daeffcd695c0493f04968a5690fb4f80/btrfs-du#L97-L105 ```shell OUT=$( $btrfs_qgroup_show_raw "$LOCATION" 2>&1 ) grep -i -q -e "rescan is running" -e "data inconsistent"

https://github.com/nachoparker/btrfs-du/blob/239fbb80daeffcd695c0493f04968a5690fb4f80/btrfs-du#L91 ```shell trap 'btrfs quota disable '"$LOCATION"'; exit 255' SIGINT SIGTERM ```

On OS without `fork` support, `wclass` in `OrderedStage.__init__` is required to be serializable, that's a problem. Otherwise an exception will be raised: > AttributeError: Can't pickle local object 'OrderedStage.__init__..wclass'