Show diff between debian packages

debpkg_diff.sh

#!/bin/bash
set -e

DEB_DIR=/var/cache/apt/archives

pkg1=$1
pkg2=$2

file1=$DEB_DIR/$pkg1
file2=$DEB_DIR/$pkg2

usage() {
        echo "Usage: $0 <package1> <package2>"
        exit 1
}

if [[ -z $pkg1 || -z $pkg2 ]]; then
        usage
fi

echo "Displaying diff between backages $pkg1 and $pkg2"

wrkdir=`mktemp -d`
cd $wrkdir

extract() {
        file=$1
        echo "Extracting $file (deb)"
        ar x $file
        tar zxf control.tar.gz
        mkdir data
        echo "Extracting $file (data)"
        tar zxf data.tar.gz -C data
}

mkdir $wrkdir/a && cd $wrkdir/a
extract $file1

mkdir $wrkdir/b && cd $wrkdir/b
extract $file2

cd $wrkdir

diff -x '*.pyc' -x changelog.Debian.gz -ur a b | view -