minideb/dockerdiff at add-template · adeelahmad/minideb

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#!/bin/bash

# Compare two docker images, reporting what changed.

# The script will exit 1 if there are differences between the images

# other than their tags.

# It will also try and show what the differences 529E are, comparing

# - the image config

# - the installed dpkg packages

# - changed file metadata

# - changed file checksums

set -e

set -u

set -o pipefail

IMAGE1=$1

IMAGE2=$2

inspect() {

docker inspect $1 | jq ".[0]|del(.RepoTags,.RepoDigests)"

}

dpkgl() {

docker run --rm $1 dpkg -l

}

lslr() {

docker run --rm $1 bash -c 'find / -xdev -not -path /proc -a -not -path /sys -print0 | sort -z | xargs -0 ls -ld'

}

md5() {

docker run --rm $1 bash -c 'find / -xdev -not -path /etc/hosts -a -not -path /etc/hostname -a -type f -print0 | sort -z | xargs -0 md5sum'

}

_diff() {

local cmd=$1

diff -u --label $IMAGE1 --label $IMAGE2 <($cmd $IMAGE1) <($cmd $IMAGE2)

}

if ! _diff inspect; then

_diff dpkgl || true

_diff lslr || true

_diff md5 || true

exit 1