#!/bin/bash

# path variables
pacconf=/etc/pacman.conf
dbpath=/var/lib/pacman/local

# get a list of NoUpgrade files from the user's pacman.conf
echo ":: Retrieving pacman.conf NoUpgrade list..."
config=$(grep "^NoUpgrade" $pacconf | cut -d'=' -f2)
# add the standard list of files, even if they are already above
config="$config \
etc/passwd etc/group etc/shadow etc/sudoers \
etc/fstab etc/raidtab etc/ld.so.conf \
etc/rc.conf etc/rc.local \
etc/modprobe.conf etc/modules.conf \
etc/lilo.conf boot/grub/menu.lst"

# blank md5sum for use in sed expression
zeroes='00000000000000000000000000000000'

for file in $config; do
	echo ":: -> finding owner of /$file..."
	line=$(LANG=C pacman -Qo /$file 2>/dev/null)
	# if file is owned by a package, go find its incorrectly stored sum
	if [ ! -z "$line" ]; then
		# get the name and version of the package owning file
		name=$(echo $line | awk '{print $5}')
		version=$(echo $line | awk '{print $6}')
		# set the path to the backup array holding the md5sum
		path="$dbpath/$name-$version/files"
		# run a sed on the path to reset the line containing $file
		# NOTE: literal tab characters in sed expression after $file
		echo ":: -> resetting sum of /$file..."
		sed -i "s#$file	[0-9a-fA-F]*#$file	$zeroes#" $path
	else
		echo ":: -> $file is unowned."
	fi
done