#!/bin/sh

## live-config(7) - System Configuration Components
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


#set -e

Cmdline ()
{
	# Reading kernel command line
	for _PARAMETER in ${LIVE_CONFIG_CMDLINE}
	do
		case "${_PARAMETER}" in
			live-config.hostname=*|hostname=*)
				LIVE_HOSTNAME="${_PARAMETER#*hostname=}"
				;;
		esac
	done
}

Init ()
{
	# Checking if package is installed or already configured
	if [ -z "${LIVE_HOSTNAME}" ] || \
	   [ -e /var/lib/live/config/hostname ]
	then
		exit 0
	fi

	echo -n " hostname"
}

Config ()
{
	# Change hostname only if it is not set
	if [ ! -e /etc/hostname ] || \
	   grep -qs localhost\.localdomain /etc/hostname
	then
		# Supporting variables within hostnames
		if [ -e /bin/ip ]
		then
			LINK="$(ip -oneline -family link address show dev eth0 | awk '{ print $13 }' | sed -e "s|:|${_IP_SEPARATOR}|g")"
			INET="$(ip -oneline -family inet address show dev eth0 | awk '{ print $4 }' | sed -e "s|\.|${_IP_SEPARATOR}|g" -e 's|/.*||')"
			INET6="$(ip -oneline -family inet6 address show dev eth0 | awk '{ print $4 }' | sed -e "s|:|${_IP_SEPARATOR}|g" -e 's|/.*||' -e 's|--|-|')"

			eval LIVE_HOSTNAME="${LIVE_HOSTNAME}"
		fi

		echo "${LIVE_HOSTNAME}" > /etc/hostname
	else
		LIVE_HOSTNAME="$(cat /etc/hostname)"
	fi

	# Updating hostname in /etc/hosts
	if [ -s /etc/hosts ]
	then
		# /etc/hosts exists but has no 127.0.0.1
		if ! grep -Eq "^ *127.0.0.1" /etc/hosts
		then
			mv /etc/hosts /etc/hosts.tmp

			echo "127.0.0.1       localhost ${LIVE_HOSTNAME}" > /etc/hosts
			cat /etc/hosts.tmp >> /etc/hosts

			rm -f /etc/hosts.tmp
		# /etc/hosts exists and has no matching 127.0.0.1
		elif ! grep -Eq "^ *127.0.0.1.*${LIVE_HOSTNAME}" /etc/hosts
		then
			_HOSTS="$(grep -E "^ *127.0.0.1" /etc/hosts | awk '{ $1=""; print $0 }' | sed -e 's|localhost||')"
			_HOSTS="$(echo localhost ${_HOSTS} ${LIVE_HOSTNAME} | sed -e 's|^ ||' -e 's|  | |g')"

			sed -i -e "s|^ *127.0.0.1.*|127.0.0.1       ${_HOSTS}|" /etc/hosts
		fi
	else
		# /etc/hosts does not exist

cat > /etc/hosts << EOF
127.0.0.1       localhost ${LIVE_HOSTNAME}
::1             localhost ip6-localhost ip6-loopback
fe00::0         ip6-localnet
ff00::0         ip6-mcastprefix
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
EOF

	fi

	hostname "${LIVE_HOSTNAME}" || true

	# Creating state file
	touch /var/lib/live/config/hostname
}

Cmdline
Init
Config