shrink docker for mac hyperkit

it is problem of hyperkit not docker for mac

hyperkit didn't supperly shrink

if you need shrinks please use vmware and install vmwaretool even you can share the host filesystem to docker vm client and set docker lib fites to the host share path.

I try to shrink use du but the shrinked file didn't work。

by now

i think the only way to shrink is delete the Docker.qcow2 rebuild it and load older images and containers,like dump and load

so i write this python script

since docker export/import will lost containner's env and cann't restart containers, so commit to a new image and then start new containers depend it.

this script can restart container with current port but cann't resume the volumes

in order to avoid the unexpected i suggest do it manual