git-sys-diff

#!/bin/bash

file="$1"
if test "x${file}" = "x" || test ! -f "${file}"
then
	echo "Usage: git sys-diff config-file"
	exit 2
fi


package="$(dpkg -S "${file}" | awk -F ': ' '{print $1}')"

if test "x${package}" = "x"
then
	package="$(ucfq -w "${file}" | awk -F: '{print $2}')"
fi

if test "x${package}" = "x"
then
	echo "No package found."
	exit 1
fi

cache="/var/lib/ucf/cache/${file//\//:}"
if [ -f "$cache" ]; then
	vimdiff "${cache}" "${file}"
	exit 0
fi

echo "Package: $package"

archive="$(ls /var/cache/apt/archives/${package}_*.deb | tail -n 1)"
if test "x${archive}" = "x"
then
	echo "no archive found."
	exit 1
fi

#dpkg-deb --fsys-tarfile "${archive}" | tar -tvf -

content="$(dpkg-deb --fsys-tarfile /var/cache/apt/archives/${package}_*.deb | tar -xvf - ".${file}" -O)"

vimdiff <(echo "${content}") "${file}"