#!/bin/bash
#
# This script checks which .deb packages can be used from the rootstrap.
#
# dpkg-checkbuilddeps uses this to builds a new temporary "status" file of
# all usable packages.
#
# Copyright (c) 2008 Nokia Corporation. All rights reserved.
# Author: Lauri T. Aarnio
# Licensed under LGPL version 2.1, see top level LICENSE file for details.

function usage()
{
	cat <<EOF
sb2-check-pkg-mappings - check usability of target's .deb packages
Usage:
	sb2-check-pkg-mappings pkg1 [pkg2..]
	sb2-check-pkg-mappings -a
	sb2-check-pkg-mappings -u
	sb2-check-pkg-mappings -f

Options:
    -a		check all packages and write results to a temporary
		database, to be used by sb2's dpkg-checkbuilddeps
    -u          Update: check if the temporary DB is up to date,
                activate option -a if needed
    -v          verbose mode: Report all paths with mapping status
    -f          use force: update timestamp of the temporary DB
                if it exists, but don't check the contents. This may
                be dangerous and may break your configuration!

When started with list of package names, checks named packages and prints
results, but does not create or modify the temporary database.
EOF
	exit 1
}

if [ -z "$*" ]; then
	usage
fi
prog="$0"
progbase=`basename $0`

function error_not_inside_sb2()
{
	echo "SB2: $progbase: This program can only be used from inside"
	echo "the scratchbox 2'ed environment"
	exit 1
}

if [ -z "$SBOX_SESSION_DIR" ]; then
	error_not_inside_sb2
fi

. $SBOX_SESSION_DIR/sb2-session.conf

check_all_pkgs="no"
check_if_out_of_date="no"
update_timestamp_by_force="no"
status_file=""
bothreq_file=""
VERBOSE_OPTION=""

while getopts auhvf foo
do
	case $foo in
	(a) check_all_pkgs="yes" ;;
	(u) check_if_out_of_date="yes" ;;
	(f) update_timestamp_by_force="yes" ;;
	(h) usage ;;
	(v) VERBOSE_OPTION="-v" ;;
	(*) usage ;;
	esac
done
shift $(($OPTIND - 1))

# Target's real package db:
TARGET_DPKG_ADMINDIR_ALL_PKGS=$sbox_target_root/var/lib/dpkg

if [ $check_all_pkgs = "yes" -o "$check_if_out_of_date" = "yes" ]; then
	if [ ! -d $sbox_temp_dpkg_admin_dir ]; then
		mkdir $sbox_temp_dpkg_admin_dir
	fi
fi

if [ "$update_timestamp_by_force" = "yes" ]; then
	if [ ! -f $sbox_temp_dpkg_admin_dir/status ]; then
		echo "FAILED: $sbox_temp_dpkg_admin_dir/status does not exist."
		exit 1
	fi
	touch $sbox_temp_dpkg_admin_dir/status
	echo "$sbox_temp_dpkg_admin_dir/status pretends to be up-to-date now."
	exit 0
fi

if [ "$check_if_out_of_date" = "yes" ]; then
	# Check that the list of usable packages exists and is up-to-date.
	# That list is really a temporary package database, which contains only
	# packages that are usable thru this mapping mode.

	if [ ! -f $sbox_temp_dpkg_admin_dir/status ]; then
		echo "$sbox_temp_dpkg_admin_dir/status does not exist."
		echo "going to create it now. This is going to take a while.."
		echo
		check_all_pkgs="yes"
	elif [ $sbox_temp_dpkg_admin_dir/status -ot \
	       $TARGET_DPKG_ADMINDIR_ALL_PKGS/status ]; then
		echo "Target's primary package database has been updated =>"
		echo "$sbox_temp_dpkg_admin_dir/status is out of date."
		echo "going to update it now. This is going to take a while.."
		echo
		check_all_pkgs="yes"
	elif [ $sbox_temp_dpkg_admin_dir/status -ot \
	       $sbox_dir/share/scratchbox2/lua_scripts/pathmaps/$sbox_mapmode/00_default.lua ]; then
		echo "SB2's mapping rules have been updated =>"
		echo "$sbox_temp_dpkg_admin_dir/status might be out of date."
		echo "going to update it now. This is going to take a while.."
		echo
		check_all_pkgs="yes"
	fi

	if [ "$check_all_pkgs" != "yes" ]; then
		echo "$sbox_temp_dpkg_admin_dir/status is up-to-date."
		exit 0
	fi
fi

pkgs2check="$*"
tstamp=`/bin/date +%Y%m%d-%H%M`

if [ -z "$pkgs2check" -a "$check_all_pkgs" = "yes" ]; then
	# check all installed packages
	pkgs2check=`dpkg --get-selections | grep 'install$' | sed -e 's/install$//'`
	status_file=STATUS-NEW.$tstamp.$$
	bothreq_file=BOTH_REQ-NEW.$tstamp.$$
elif [ "$check_all_pkgs" = "yes" ]; then
	# -a and package names - illegal
	usage
fi

function add_pkg_to_status_file()
{
	if [ $check_all_pkgs = "yes" ]; then
		if [ -f $status_file ]; then
			echo >>$status_file
		fi
		dpkg -s $pkg >>$status_file
	fi
}

function remove_temp_files
{
	if [ -n "$status_file" -a -f "$status_file" ]; then
		echo "removing temp file '$status_file'"
		rm $status_file
	fi
	if [ -n "$bothreq_file" -a -f "$bothreq_file" ]; then
		echo "removing temp file '$bothreq_file'"
		rm $bothreq_file
	fi
}
trap remove_temp_files EXIT

pkgnum=0
num_ok=0
num_failed=0
num_both_required=0

# Read the mode-specific path ignore list.
SB2_CHECK_PKG_MAPPINGS_IGNORE_LIST=""
if [ -f $sbox_dir/share/scratchbox2/modeconf/sb2rc.$sbox_mapmode ]; then
	. $sbox_dir/share/scratchbox2/modeconf/sb2rc.$sbox_mapmode "sb2-check-pkg-mappings"
fi

# for all installed packages..
for pkg in $pkgs2check; do
	pkgnum=`expr $pkgnum + 1`
	echo "=========== $pkgnum. Checking $pkg ==========="

	# get list of files installed by this package (dpkg -L),
	# and feed it to sb2-show to be verified (-D causes directories
	# to be ignored). Also ignore all files which are installed
	# to these diretories listed in $SB2_CHECK_PKG_MAPPINGS_IGNORE_LIST.
	sb2_pkg_chk=`mktemp /tmp/sb2-pkg-chk.XXXXXXXXXX`
	dpkg -L $pkg >$sb2_pkg_chk
	if [ $? != 0 ]; then
		num_failed=`expr $num_failed + 1`
		echo "	$pkg is not available"
	else
		sed < $sb2_pkg_chk\
		    -e 's/diverted by .* to: //' \
		    -e 's/package diverts others to: //' |
		sb2-show -D verify-pathlist-mappings \
			$VERBOSE_OPTION \
			$sbox_target_root $SB2_CHECK_PKG_MAPPINGS_IGNORE_LIST
		pathlist_mappings_result=$?
		if [ $pathlist_mappings_result == 0 ]; then
			# package can be safely used, all mappings are OK:
			echo "	$pkg = OK"
			num_ok=`expr $num_ok + 1`
			add_pkg_to_status_file
		elif [ $pathlist_mappings_result == 2 ]; then
			# package can be used, as long as it is installed to 
			# the target_root AND to the tools
			echo "	$pkg : required also from tools"
			num_both_required=`expr $num_both_required + 1`
			add_pkg_to_status_file
			if [ $check_all_pkgs = "yes" ]; then
				echo $pkg >>$bothreq_file
			fi
		else
			num_failed=`expr $num_failed + 1`
			echo "	$pkg can not be used in this mode ($sbox_mapmode)"
		fi
	fi
	rm $sb2_pkg_chk
done

echo "Checked $pkgnum packages: Ok=$num_ok, unusable=$num_failed, both required=$num_both_required"

if [ $check_all_pkgs = "yes" ]; then
	if [ ! -d $sbox_temp_dpkg_admin_dir ]; then
		mkdir $sbox_temp_dpkg_admin_dir
	fi
	mv $status_file $sbox_temp_dpkg_admin_dir/status
	mv $bothreq_file $sbox_temp_dpkg_admin_dir/both-required
	echo "Results have been written to $sbox_temp_dpkg_admin_dir/status"
fi