Virtualbox guest time workaround

0refresh-ntp.sh

#!/bin/bash

# /etc/cron.hourly/0refresh-ntp
# Workaround for guest clock going out of skew regularly

# Essentially synchronizes systemd-timesyncd with NTP
# via timedatectl but using a reference of the datetime
# returned by http://worldtimeapi.org/api/ip

set -eu -o pipefail

function systemctl {
  command systemctl "$@" > /dev/null
}

function restart-guest-services {
  if ! systemctl status vboxadd.service; then
    systemctl restart vboxadd.service
  fi
  systemctl status vboxadd.service

  if ! systemctl status vboxadd-service.service; then
    systemctl restart vboxadd-service.service
  fi
  systemctl status vboxadd-service.service
}

if [[ $1 == 'full' ]]; then
  restart-guest-services || true
fi

timedatectl set-ntp false

wtapi=$(curl -fsSL "http://worldtimeapi.org/api/ip")

timezone=$(jq -Scer .timezone <<< "$wtapi")
echo "$timezone" > /etc/timezone
timedatectl set-timezone "$TZ"

datetime=$(jq -Scer .datetime <<< "$wtapi")
date -s "$datetime" > /dev/null
TZ=$(< /etc/timezone) date

timedatectl set-local-rtc false

timedatectl set-ntp true
sleep 2

timedatectl --monitor

vbox-start.sh

# function to launch our VM
freya() {
  set -xv
  while ! VBoxManage showvminfo freya --machinereadable | awk -F'[\"=]' '$1 == "VMState" && $3 == "running" { ec=0 } BEGIN { ec=1 } END { exit ec }'; do
    VBoxManage modifyvm freya --rtcuseutc on
    VBoxManage setextradata freya 'VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled' 1
    VBoxManage startvm freya --type headless;
  done
  ssh -tt -o ConnectTimeout=1 -o ConnectionAttempts=60 localhost -p 2022 'FORCE=1 ~/.bin/tmuxie default'
}