#!/bin/sh

targetdir=/tmp/localtweaks

origfiles="`cd /etc && find . -name '*.orig'`"
oldfiles="`cd /etc && find . -name '*.old'`"

# merge all to only process once when both .orig and .old exist
files="`echo $origfiles $oldfiles | tsort`"

for file in $files; do
	olddir="/etc/`dirname $file`"
	newdir="$targetdir/`dirname $file`"
	oldname="`basename $file`"
	newname="`basename $file .orig`"
	if [ ! -e $olddir/$newname.orig ]; then
		newname="`basename $file .old`"
	fi
	if [ "$oldname" = "$newname" ]; then
		echo "FATAL: file is neither .orig nor .old: \"$file\"!"
		exit 1
	fi
	if [ ! -e $olddir/$oldname ]; then
		echo "FATAL: file found disappeared again: \"$file\"!"
		exit 1
	fi
	mkdir -p $newdir
	cp -af $olddir/$newname $newdir

	# Only diff against non-empty files.
	if [ -s $olddir/$oldname ]; then
		diff -ruN $olddir/$oldname $olddir/$newname > $newdir/$newname.diff
		chmod --reference=$olddir/$newname $newdir/$newname.diff
		chown --reference=$olddir/$newname $newdir/$newname.diff
	fi
done