#!/bin/bash
#
#  Copyright (c) 02005-02006 sense.lab <devel@senselab.org.org>
#
#  License:  This script is distributed under the terms of version 2
#            of the GNU GPL. See the LICENSE file included with the package.
#
# $Id$
#
# managing our work at the cryptobox
#
# usual workflow:
#   dfsbuild	- create the image directory with dfsbuild
#   config	- apply cryptobox specific changes to the image directory
#   harden	- remove unnecessary packages and disable developer features
#   iso		- create the iso image
#   isoz	- create a compressed iso image
#   burn	- burns the image on a cd-rw
#
# final action:
#   release	- the same as "dfsbuild config harden isoz"
#
#
# problems of this script:
#  - has to run as root
#  - 'harden' is strangely integrated
#
# you may run this script with multiple arguments, e.g.:
#   cb-build.sh dfsbuild config isoz
#
# the action "release" does what it says :)
#  (all developer's features like sshd, writable templates and
#   the test-suite are deactivated, some packages get removed)
#

set -ue

# include common functions and settings
source "$(dirname $0)/common.sh.inc"


################### some settings ######################

# dfsbuild config
DFS_CONFIG=$(get_config_file dfs-cbox.conf)

# debian package of cryptobox-server
DEB_PACKAGE=$ROOT_DIR/packages/cryptobox-server.deb


####################### functions ######################

# samba fails to install if /proc/ is empty
# we force samba to skip startup during configuring
function workaround_samba_proc()
{
	# let dfsbuild start first
	sleep 15
	local DEFAULT_DIR=$IMAGE_DIR/etc/default
	mkdir -p "$DEFAULT_DIR"
	echo "exit" >"$DEFAULT_DIR/samba"
}


function run_dfsbuild()
{
	# we need a secret gpg key for apt-move/reprepro(?) - very strange
	# see: http://lists.debian.org/debian-user/2005/09/msg03288.html
	if test -z "$(gpg --list-secret-keys 2>/dev/null)"
	  then	echo "*************************************************************"
			echo "* Sorry - for some strange reason you/root need a secret    *"
			echo "* gpg key without a passphrase!                             *"
			echo "* Please create a key first: 'gpg --gen-key'                *"
			echo "*************************************************************"
			exit 1
	 fi >&2
	if [ -e "$BUILD_DIR" ]
	  then	## umount all other directories below
		mount | cut -d " " -f 3- | sed "s/ type .*$//" | grep "$IMAGE_DIR" | while read mdir
		  do	umount "$mdir"
		 done
		echo "removing the build directory ($BUILD_DIR) to guarantee a clean build ..."
		rm -r "$BUILD_DIR"
	 fi

	workaround_samba_proc &

	# build the target directory
	LANG=C dfsbuild -c "$DFS_CONFIG" -w "$BUILD_DIR/" 
	
	# remove iso image of dfsbuild - it is not necessary
	[ -e "$BUILD_DIR/image.iso" ] && rm "$BUILD_DIR/image.iso"

	# finish package installation
	echo "dpkg --configure --pending" | chroot_image
}


function create_uncompressed_iso()
{
	# check for a mounted procfs
	mount | grep -q " $IMAGE_DIR/proc " && umount "$IMAGE_DIR/proc"
	echo "Creating the iso ..."
	mkisofs $MKISOFS_OPTIONS -o "$IMAGE_FILE" "$IMAGE_DIR"
}


function create_compressed_iso()
{
	# check for a mounted procfs
	mount | grep -q " $IMAGE_DIR/proc " && umount "$IMAGE_DIR/proc"
	echo "Creating the compressed iso ..."
	[ -e "$IMAGEZ_DIR" ] && rm -r "$IMAGEZ_DIR"
	mkdir "$IMAGEZ_DIR"
	for a in $(ls "$IMAGE_DIR")
		do	if echo "$UNCOMPRESSED_ITEMS" | grep -q -w "$a"
				then	echo "	Copying uncompressed item: $a ..."
					cp -a "$IMAGE_DIR/$a" "$IMAGEZ_DIR"
				else	if [ -h "$IMAGE_DIR/$a" ]
						then	echo "	Copying link: $a ..."
							cp -a "$IMAGE_DIR/$a" "$IMAGEZ_DIR"
						else	echo "	Compressing item: $a ..."
							mkzftree "$IMAGE_DIR/$a" "$IMAGEZ_DIR/$a"
					  fi
			  fi
	  done
	mkisofs -z $MKISOFS_OPTIONS -o "$IMAGEZ_FILE" "$IMAGEZ_DIR"
}


function configure_cb()
{
	if [ ! -e "$IMAGE_DIR" ]; then 
		echo -e "Directory \"$IMAGE_DIR\" not found!"
		echo -e "Did you run \"$0 dfsbuild\"?" 
		exit 1
	fi

	echo "Copying files to the box ..."
		svn export --force "$TEMPLATE_DIR/." "$IMAGE_DIR"
	
	echo "Configuring the cryptobox ..."
		echo "/usr/lib/cryptobox-cd/configure-cryptobox.sh normal" | chroot_image
	
	# source local configure scripts
	[ -d "$CUSTOM_CONFIGURE_DIR" ] && \
	  find "$CUSTOM_CONFIGURE_DIR" -xtype f | sort | while read file
	     do	echo "Sourcing custom configure script $(basename $file) ..."
		# execute it in its own environment (to be safe)
		# 'source' implicitly imports all current settings
		# indent these lines to improve the output
		( source "$file" ) 2>&1 | sed 's/^/\t/'
	done
}


function install_package()
{
	## first disable automatic startup to avoid conflicts with local servers
	local conf_file=$IMAGE_DIR/etc/default/cryptobox-server
	test -e "$conf_file" && sed -i 's/^NO_START=.*$/NO_START=1/' "$conf_file"
	local chroot_deb_file=/cryptobox-server.deb
	cp "$DEB_PACKAGE" "$IMAGE_DIR$chroot_deb_file"
	echo "dpkg -i $chroot_deb_file" | chroot_image
	rm "$IMAGE_DIR$chroot_deb_file"
}


function blanknburn_cdrw()
{
	cdrecord -v dev=$CDWRITER blank=fast
	if [ -e "$IMAGEZ_FILE" ]; then
		cdrecord -v dev=$CDWRITER $IMAGEZ_FILE
	elif [ -e "IMAGE_FILE" ]; then
		cdrecord -v dev=$CDWRITER $IMAGE_FILE
	else
		echo "can't find CryptoBox image to burn" && exit 1
	fi
}


################ do it! ######################

[ $# -eq 0 ] && echo "[`basename $0`] - no arguments supplied - maybe you want to use '--help'"

# initialize local directories (easier for users)
for a in $LOCALCONF_DIR $CUSTOM_CONFIGURE_DIR
	do	[ ! -e "$a" ] && mkdir "$a" && chown --reference=. "$a"
done

# check for uid=0 (necessary for all operations)
[ "$(id -u)" -ne 0 ] && echo "this script ($0) has to be called as root" >&2 && exit 1

while [ $# -gt 0 ]
  do	case "$1" in
	dfsbuild )
		# check if we are in ROOT_DIR - otherwise we will have problems with
		# relative paths in dfs-box.conf
		[ "$ROOT_DIR" -ef "$(pwd)" ] || error_die 1 "Sorry: you have to run $0 while you are in '$ROOT_DIR'!"
		run_dfsbuild
		;;
	config )
		install_package
		configure_cb normal
		;;
	iso )
		create_uncompressed_iso
		;;
	isoz )
		create_compressed_iso
		;;
	harden )
		echo "/usr/lib/cryptobox-cd/configure-cryptobox.sh normal" | chroot_image
		echo "/usr/lib/cryptobox-cd/configure-cryptobox.sh secure" | chroot_image
		;;
	burn )
		blanknburn_cdrw
		;;
	release )
		"$0" dfsbuild config harden isoz
		md5sum $IMAGEZ_FILE > ${IMAGEZ_FILE}.md5sum
		sha1sum $IMAGEZ_FILE > ${IMAGEZ_FILE}.sha1sum
		;;
	help|--help )
		echo "Syntax: `basename $0` ( release | dfsbuild | config | harden | iso | isoz | burn | help )"
		echo "  (you may specify more than one action)"
		echo
		;;
	* )
		echo -e "unknown action: $1"
		echo
		$0 help
		exit 1
		;;
	esac
	shift
  done