#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
##
## live-build 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

# Including common functions
. "${LB_BASE:-/usr/share/live/build}"/scripts/build.sh

# Setting static variables
DESCRIPTION="$(Echo 'execute hacks in chroot')"
HELP=""
USAGE="${PROGRAM} [--force]"

Arguments "${@}"

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults

Echo_message "Begin executing hacks..."

# Requiring stage file
Require_stagefile .build/config .build/bootstrap

# Checking stage file
Check_stagefile .build/chroot_hacks

# Checking lock file
Check_lockfile .lock

# Creating lock file
Create_lockfile .lock

case "${LB_PARENT_DISTRIBUTION}" in
	squeeze)
		if echo "${LB_TASKS}" | grep -qs lxde ||
			echo "${LB_TASKS}" | grep -qs xfce
		then
			GDM="gdm"
		else
			GDM="gdm3"
		fi
		;;

	*)
		GDM="gdm3"
		;;
esac

# Handling default desktop configuration
case "${LB_MODE}" in
	debian*)
		# disable kexec-tools
		if [ -e chroot/sbin/kexec ]
		then
			echo "kexec-tools kexec-tools/load_kexec boolean false" > chroot/root/preseed
			Chroot chroot "debconf-set-selections /root/preseed"
			rm -f chroot/root/preseed
			Chroot chroot "dpkg-reconfigure kexec-tools"
		fi
		;;
esac

for TASK in ${LB_TASKS}
do
	case "${TASK}" in
		gnome-desktop)
			# gnome is the only desktop environment in this image
			if [ -z "$(echo ${LB_TASKS} | sed -e 's|gnome-desktop||' -e 's| desktop ||' | grep desktop)" ]
			then
				# set display manager
				echo "${GDM} shared/default-x-display-manager select ${GDM}" > chroot/root/preseed
				Chroot chroot "debconf-set-selections /root/preseed"
				rm -f chroot/root/preseed
				Chroot chroot "dpkg-reconfigure ${GDM}"
				echo "/usr/bin/${GDM}" > chroot/etc/X11/default-display-manager

				# set session manager
				Chroot chroot "update-alternatives --set x-session-manager /usr/bin/gnome-session"
			fi
			;;

		kde-desktop)
			# kde is the only desktop-environment in this image
			if [ -z "$(echo ${LB_TASKS} | sed -e 's|kde-desktop||' -e 's| desktop ||' | grep desktop)" ]
			then
				# set display manager
				echo "kdm shared/default-x-display-manager select kdm" > chroot/root/preseed
				Chroot chroot "debconf-set-selections /root/preseed"
				rm -f chroot/root/preseed
				Chroot chroot "dpkg-reconfigure kdm"
				echo "/usr/bin/kdm" > chroot/etc/X11/default-display-manager

				# set session manager
				Chroot chroot "update-alternatives --set x-session-manager /usr/bin/startkde"

				# get rid of resolvconf
				Chroot chroot "dpkg -P resolvconf"
			fi
			;;

		lxde-desktop)
			# lxde is the only desktop environment in this image
			if [ -z "$(echo ${LB_TASKS} | sed -e 's|lxde-desktop||' -e 's| desktop ||' | grep desktop)" ]
			then
				# set display manager
				echo "${GDM} shared/default-x-display-manager select ${GDM}" > chroot/root/preseed
				Chroot chroot "debconf-set-selections /root/preseed"
				rm -f chroot/root/preseed
				Chroot chroot "dpkg-reconfigure ${GDM}"
				echo "/usr/bin/${GDM}" > chroot/etc/X11/default-display-manager

				# set session manager
				Chroot chroot "update-alternatives --set x-session-manager /usr/bin/startlxde"
			fi
			;;

		xfce-desktop)
			# xfce is the only desktop environment in this image
			if [ -z "$(echo ${LB_TASKS} | sed -e 's|xfce-desktop||' -e 's| desktop ||' | grep desktop)" ]
			then
				# set display manager
				echo "${GDM} shared/default-x-display-manager select ${GDM}" > chroot/root/preseed
				Chroot chroot "debconf-set-selections /root/preseed"
				rm -f chroot/root/preseed
				Chroot chroot "dpkg-reconfigure ${GDM}"
				echo "/usr/bin/${GDM}" > chroot/etc/X11/default-display-manager

				# set session manager
				Chroot chroot "update-alternatives --set x-session-manager /usr/bin/xfce4-session"
			fi
			;;
	esac
done

case "${LB_BINARY_IMAGES}" in
	netboot)
		if [ ! -f chroot/sbin/mount.cifs ]
		then
			Apt chroot install cifs-utils
		fi

		if [ ! -d chroot/etc/initramfs-tools ]
		then
			mkdir chroot/etc/initramfs-tools
		fi

		# Configuring initramfs for NFS
		if ! grep -qs "BOOT=nfs" chroot/etc/initramfs-tools/initramfs.conf
		then
			echo "BOOT=nfs" >> chroot/etc/initramfs-tools/initramfs.conf
		fi

		if ! grep -qs "NFSROOT=auto" chroot/etc/initramfs-tools/initramfs.conf
		then
			echo "NFSROOT=auto" >> chroot/etc/initramfs-tools/initramfs.conf
		fi
		;;
esac

# Update initramfs (always, because of udev rules in initrd)
case "${LB_INITRAMFS}" in
	casper)
		UPDATE_INITRAMFS_OPTIONS="CASPER_GENERATE_UUID=1"
		;;

	live-boot)
		#UPDATE_INITRAMFS_OPTIONS="LIVE_GENERATE_UUID=1"
		;;
esac

if [ "${LB_INITRAMFS}" != "none" ]
then
	Chroot chroot "${UPDATE_INITRAMFS_OPTIONS} update-initramfs -k all -t -u"
fi

# We probably ought to use COMPRESS= in a temporary file in
# /etc/initramfs-tools/conf.d/ instead, but it's hard to pass options that
# way.
case "${LB_INITRAMFS_COMPRESSION}" in
	gzip)
		;;

	bzip2)
		for INITRAMFS in $(find chroot/boot -name 'initrd*'); do
			zcat "${INITRAMFS}" | bzip2 -c ${BZIP2_OPTIONS} > "${INITRAMFS}.new"
			mv "${INITRAMFS}.new" "${INITRAMFS}"
		done
		;;

	lzma)
		# We probably ought to use COMPRESS= in a temporary file in
		# /etc/initramfs-tools/conf.d/ instead, but it's hard to
		# pass options that way.
		for INITRAMFS in $(find chroot/boot -name 'initrd*'); do
			zcat "${INITRAMFS}" | lzma -c ${LZMA_OPTIONS} > "${INITRAMFS}.new"
			mv "${INITRAMFS}.new" "${INITRAMFS}"
		done
		;;
esac

# Ensure readable permissions on initramfs. loop-aes-utils sets umask to
# protect GPG keys, which live-build does not support.
# Note: Use find rather than chmod on the wildcard, one never knows what
# people might do in local hooks, and there might be no initrds at all.
find chroot/boot -name 'initrd*' -print0 | xargs -r -0 chmod go+r

# Remove build systems clock drift
echo "0.0 0 0.0" > chroot/etc/adjtime

# Remove cruft
rm -f chroot/boot/initrd*bak*
rm -f chroot/etc/apt/trusted.gpg~
rm -f chroot/etc/group- chroot/etc/passwd-
rm -f chroot/etc/gshadow- chroot/etc/shadow-
rm -f chroot/var/cache/debconf/*-old
rm -f chroot/var/lib/dpkg/*-old
rm -f chroot/var/log/apt/term.log

# Delete and re-create temporary directories
TEMP_DIRS="/tmp /var/tmp"
for DIR in ${TEMP_DIRS}
do
	rm -rf "chroot/${DIR}"
	install -d -m 1777 "chroot/${DIR}"
done

if [ -n "${LB_ROOT_COMMAND}" ]
then
	${LB_ROOT_COMMAND} chown -R --quiet $(whoami):$(whoami) chroot
fi

case "${LB_INITRAMFS}" in
	casper)
		ID="999"
		;;

	live-boot)
		ID="1000"
		;;

	*)
		ID=""
		;;
esac

if [ "${LB_DEBIAN_INSTALLER}" = "live" ]
then
	# This is a temporary hack to get rid of fstab;
	# needs cleanup in live-boot first to proper fix.
	rm -f chroot/etc/fstab
	touch chroot/etc/fstab
fi

if [ "${LB_EXPOSED_ROOT}" = "true" ]
then
	# Make sure RW dirs exist so that the initramfs script has
	# a directory in which to bind the tmpfs filesystems
	COW_DIRECTORIES="/home /live /tmp /var/lib/live /var/lock /var/log /var/run /var/tmp /var/spool"

	for DIRECTORY in ${COW_DIRECTORIES}
	do
		mkdir -p chroot/"${DIRECTORY}"
	done

	# Config files which need to be RW
	COW_FILES="/etc/adjtime /etc/fstab /etc/hostname /etc/hosts /etc/live.conf /etc/network/interfaces /etc/resolv.conf /etc/udev/rules.d/*persistent-net.rules /etc/udev/rules.d/*persistent-cd.rules /etc/X11/xorg.conf"

	# Where we will store RW config files
	RW_DIRECTORY="/var/lib/live"

	for FILE in ${COW_FILES}
	do
		DIRECTORY="$(dirname ${FILE})"
		FILE="$(basename ${FILE})"
		RELATIVE_PATH="$(echo ${DIRECTORY} | sed 's|[^/]\+|..|g; s|^/||g')"

		# Touch files in case they don't yet exist
		mkdir -p chroot/${DIRECTORY}
		touch chroot/${DIRECTORY}/${FILE}

		# Move files to the read-write directory
		mkdir -p chroot/${RW_DIRECTORY}/${DIRECTORY}
		mv chroot/${DIRECTORY}/${FILE} chroot/${RW_DIRECTORY}/${DIRECTORY}

		# Create a symbolic link to RW config file
		ln -s ${RELATIVE_PATH}/${RW_DIRECTORY}/${DIRECTORY}/${FILE} chroot/${DIRECTORY}/${FILE}
	done

	# Mount doesn't write to a symlink so use /proc/mounts instead,
	# see debian bug #154438 for more info
	rm -f chroot/etc/mtab
	ln -s /proc/mounts chroot/etc/mtab
fi

if [ "${LB_SWAP_FILE_PATH}" ]; then
	dd if=/dev/zero of="chroot/${LB_SWAP_FILE_PATH}" bs=1024k count="${LB_SWAP_FILE_SIZE}"
	mkswap "chroot/${LB_SWAP_FILE_PATH}"
fi

# Creating stage file
Create_stagefile .build/chroot_hacks