#!/bin/bash

log_dpkg()
{
	echo dpkg $@
	/usr/bin/dpkg $@
}

# to be used on debian prior to jessie
dpkg_verify()
{
	local exitcode file pkg hashfile rfile phash hash
	exitcode=0
	for file in $*; do
		pkg=`dpkg -S "$file" | cut -d: -f 1`
		hashfile="/var/lib/dpkg/info/$pkg.md5sums"
		if [ -s "$hashfile" ]; then
			rfile=`echo "$file" | cut -d/ -f 2-`
			phash=`grep -E "$rfile\$" "$hashfile" | cut -d\  -f 1`
			hash=`md5sum "$file" | cut -d\  -f 1`
			if [ "$hash" = "$phash" ]; then
				echo "$file: ok"
			else
				echo "$file: CHANGED"
				exitcode=1
			fi
		else
			echo "$file: UNKNOWN"
			exitcode=1
		fi
	done
	return $exitcode
}

cmd_install()
{
	local n=`basename $1`
	n=`echo $n | sed "s/_[0-9.-]\+_amd64.deb//"`
	/bin/bash $0 -q $n >/dev/null 2>&1 && {
		fatal "$n is already installed (`/bin/bash $0 -q $n`)"
	}
	cmd_update $1
}

cmd_update()
{
	$dpkg --dry-run -i $1 || fatal "Test-installation failed."
	$dpkg -i $1 || fatal "Installation failed."
}

cmd_erase()
{
	#$dpkg -r $1
	$dpkg --purge $1
}

cmd_query()
{
	[ "$query_cmds" ] && {
		local cmd installed
		local id=name
		if [ "`echo $query_cmds | sed 's/.*p.*//'`" ]; then
			id=pkg
			query_cmds=`echo $query_cmds | sed 's/p//'`
		elif [ "`echo $query_cmds | sed 's/.*f.*//'`" ]; then
			id=file
			query_cmds=`echo $query_cmds | sed 's/f//'`
		fi
		for cmd in $query_cmds; do
		case $cmd in
		V)
			$dpkg --verify $1
			;;
		i)
			case $id in
			file)
				$dpkg -p $1;;
			name)
				$dpkg -I $1;;
			pkg)
				$dpkg -S $1;;
			esac
			;;
		a)
			$dpkg -L $1
			;;
		esac
		done
		return $?
	}

	local p=`echo $1 | sed 's/-[0-9.-]\+$//'`
	local v=`echo $1 | sed "s/^$p-*//"`
	local ip=`dpkg-query -W -f '${Package}' $p >/dev/null 2>&1`
	[ $? != 0 -o -z "$ip" ] && exit 1
	local iv=`dpkg-query -W -f '${Version}' $p >/dev/null 2>&1`
	[ "$v" ] && {
		[ "$v" != "$iv" ] && {
			echo "tried $1, installed version is $iv" >&2
			exit 1
		}
	}
	echo $ip-$iv
	return 0
}

usage()
{
	echo "usage: $myname [-h] [... misc rpm options]"
	[ "$1" ] && exit $1

}

fatal()
{
	echo $@ >&2
	exit 1
}

# -- here we go
myname=`basename $0`
dpkg=log_dpkg
cmd=""

set -- `getopt hqiUeVfap "$@"`
while [ "$1" != -- ]; do
case $1 in
	-h)
		usage 0
		;;
	-q)
		[ "$cmd" ] && usage 1
		cmd=query
		;;
	-V|-f|-a|-p)
		[ "$cmd" ] && {
			[ "$cmd" = query ] || usage 1
			query_cmds="$cmd ${1:1:1}"
		}
		;;
	-i)
		[ "$cmd" ] && {
			[ "$cmd" = query ] || usage 1
			query_cmds="$cmd ${1:1:1}"
			continue
		}
		cmd=install
		;;
	-U)
		[ "$cmd" ] && usage 1
		cmd=update
		;;
	-e)
		[ "$cmd" ] && usage 1
		cmd=erase
		;;
	*)
		usage 1
		;;
esac
shift
done
shift

[ $# != 1 ] && usage 1
[ "$cmd" ] || usage 1

eval cmd_\$cmd $1