replace chrome os's default penguin lxc container with ubuntu 18.06 running docker.io and a few extras.

new-penguin.sh

#!/bin/bash
# usage: curl -sL bit.ly/mlgrm-penguin | [ KEY=value [...] ] bash
# keys:
#       USER_NAME       google user name.
#       RCLONE_TOKEN    (optional) valid token generated by rclone on the user's drive
#                       if provided, the home directory will be recovered from penguin/home/$USER_NAME 
#                       and backups scheduled hourly



# the username must be the same as the google account name (i.e. the part before the @)
USER_NAME=${USER_NAME:-mlgrm}
[[ -z $RCLONE_TOKEN ]] && echo "RCLONE_TOKEN not set, so backups and recovery are disabled"

trap clean_up ERR SIGTERM SIGINT
    
clean_up () {
    lxc rm penguin
    lxc rename google penguin
    lxc start penguin
}

# backup original google image if not already
lxc stop --force penguin
if lxc info google > /dev/null; then 
    lxc rm penguin
else lxc rename penguin google
fi

# create an ubuntu 18.04 docker host named penguin
curl -sL bit.ly/mlgrm-docker | HOST_NAME=penguin bash

# install chromium guest packages
curl -sL bit.ly/mlgrm-cros-guest | lxc exec penguin -- bash

# update the user and hostname (must be the same user name as the google account)
lxc exec penguin -- bash <<EOF
echo 'penguin' > /etc/hostname
killall -u ubuntu
groupmod -n  $USER_NAME ubuntu
usermod -md /home/$USER_NAME -l $USER_NAME ubuntu
usermod -aG users $USER_NAME
loginctl enable-linger $USER_NAME
sed -i "s/ubuntu/$USER_NAME/" /etc/sudoers.d/90-cloud-init-users
reboot
EOF

# run rstudio (tidyverse) as a docker image
curl -sL bit.ly/mlgrm-rstudio | DOCKER_HOST=penguin USER=$USER_NAME bash

# install rclone
curl https://rclone.org/install.sh | lxc exec penguin -- bash

if [[ -n $RCLONE_TOKEN ]]; then
    lxc exec penguin -- mkdir -p /home/$USER_NAME/.config/rclone
    lxc exec penguin -- dd of=/home/$USER_NAME/.config/rclone/rclone.conf conv=notrunc <<EOF
[home]
type = drive
scope = drive.file
token = $RCLONE_TOKEN
EOF

    # restore home from google drive, in the background        
    lxc exec penguin -- su -c "rclone sync -q home:penguin/home/$USER_NAME /home/$USER_NAME &" - $USER_NAME 

    # backup home cronjob
    lxc exec penguin -- dd of=/etc/cron.d/rclone conv=notrunc <<EOF
# cron.d/rclone keep home directory synched with google drive
31 * * * *  $USER_NAME /usr/bin/rclone sync /home/$USER_NAME home:penguin/home/$USER_NAME 
EOF

fi