set up an lxc container running ubuntu 18.04 and docker.io on chromeos

chrome-os-docker-host.sh

#!/bin/bash
# usage: 
# curl -sL bit.ly/mlgrm-docker | HOST_NAME=name bash
# all flags can be replaced by env vars with the usual keymapping

trap clean_up ERR SIGTERM SIGINT

clean_up () {
  lxc rm --force $HOST_NAME
  lxc profile delete $HOST_NAME
}

HOST_NAME=${HOST_NAME:-docker}

lxc launch ubuntu:18.04 $HOST_NAME
lxc profile cp default $HOST_NAME
lxc profile unset $HOST_NAME security.syscalls.blacklist
lxc profile apply $HOST_NAME $HOST_NAME
lxc restart $HOST_NAME
echo "until apt-get update && apt-get install -y docker.io; do sleep 3; done" |
    lxc exec $HOST_NAME -- bash
lxc exec $HOST_NAME -- usermod -a -G docker ubuntu