livecd-rootfs/live-build/ubuntu-core/hooks/08-etc-writable.chroot

#!/bin/sh
set -e

mkdir -p /etc/writable/default

# cloud-init needs to be able to modify hostname and has the ability to
# set the other two.
for f in timezone localtime hostname watchdog.conf; do
    if [ -e /etc/$f ]; then
        echo "I: Moving /etc/$f to /etc/writable/"
        mv /etc/$f /etc/writable/$f
    fi
    echo "I: Linking /etc/$f to /etc/writable/"
    ln -s writable/$f /etc/$f
done

# do the same for /etc/default files
for f in watchdog; do
    if [ -e /etc/default/$f ]; then
        echo "I: Moving /etc/default/$f to /etc/writable/default"
        mv /etc/default/$f /etc/writable/default/$f
    fi
    echo "I: Linking /etc/default/$f to /etc/writable/default"
    ln -s /etc/writable/default/$f /etc/default/$f
done