#!/bin/sh
#-
# Copyright (c) 2011 Nathan Whitehorn
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$

test -f $BSDINSTALL_DISTDIR/MANIFEST || exit 0

percentage=0
for dist in $DISTRIBUTIONS; do
	distname=$(basename $dist .txz)
	eval "status_$distname=7"
	
	items=""
	for i in $DISTRIBUTIONS; do
		items="$items $i `eval echo \\\${status_$(basename $i .txz):-Pending}`"
	done
	dialog --backtitle "FreeBSD Installer" --title "Checksum Verification" \
	    --mixedgauge "Verifying checksums of selected distributions." \
	    0 0 $percentage $items

	CK=`sha256 -q $BSDINSTALL_DISTDIR/$dist`
	awk -v checksum=$CK -v dist=$dist -v found=0 '{
		if (dist == $1) {
			found = 1
			if (checksum == $2)
				exit(0)
			else
				exit(2)
		}
	} END {if (!found) exit(1);}' $BSDINSTALL_DISTDIR/MANIFEST

	CK_VALID=$?
	if [ $CK_VALID -le 1 ]; then
		if [ $CK_VALID -eq 0 ]; then
			eval "status_$distname=2"
		else
			eval "status_$distname=6"
		fi
		percentage=$(echo $percentage + 100/`echo $DISTRIBUTIONS | wc -w` | bc)
	else
		eval "status_$distname=1"
		case $(/bin/freebsd-version -u) in
		*-ALPHA*|*-CURRENT|*-STABLE|*-PRERELEASE)
			dialog --backtitle "FreeBSD Installer" --title "Error" \
			    --msgbox "The checksum for $dist does not match. It may have become corrupted, or it may be from a newer version of FreeBSD. Please check for a newer snapshot." 0 0
			;;
		*)
			dialog --backtitle "FreeBSD Installer" --title "Error" \
			    --msgbox "The checksum for $dist does not match. It may have become corrupted, and should be redownloaded." 0 0
			;;
		esac
		exit 1
	fi
done

exit 0