#!/usr/bin/env bash
set -ev

export CPID="$(lxc-info -Hpn {{ inventory_hostname }})"

function update_backup_resolvers {
  if [[ -e "/proc/${CPID}/root/etc/resolv.conf.setup" ]]; then
    mv /proc/${CPID}/root/etc/resolv.conf.setup /proc/${CPID}/root/etc/resolv.conf
  elif [[ -e "/proc/${CPID}/root/etc/resolv.conf" ]]; then
    cp /proc/${CPID}/root/etc/resolv.conf /proc/${CPID}/root/etc/resolv.conf.setup
  fi
}

# If the setup is complete return as the process is complete
if [[ -f "/var/lib/lxc/{{ inventory_hostname }}/setup.complete" ]]; then
  exit 0
fi

# Backup the resolvers as the setup script is not executed within an NS.
update_backup_resolvers

# Use the host resolvers
cat /etc/resolv.conf > /proc/${CPID}/root/etc/resolv.conf

# Execute
nsenter --mount=/proc/${CPID}/ns/mnt --pid=/proc/${CPID}/ns/pid \
        --uts=/proc/${CPID}/ns/uts --ipc=/proc/${CPID}/ns/ipc \
        -- /opt/container-setup.sh

# Restore the resolvers
update_backup_resolvers

# Mark the setup as complete
touch /var/lib/lxc/{{ inventory_hostname }}/setup.complete