apt-diff - Diff the installed apt packages between two versions of a Docker image

apt-diff.sh

#!/bin/bash -e

repo=$1
tag1=$2
tag2=$3

get_pkgs () {
    img=$1
    file=$2

    docker pull ${img} > /dev/null
    docker run --rm ${img} dpkg --list > ${file}
}

pkgs1=$(mktemp)
pkgs2=$(mktemp)

get_pkgs $repo:$tag1 $pkgs1
get_pkgs $repo:$tag2 $pkgs2

diff ${pkgs1} ${pkgs2}