docker_build_package_caching

build_with_proxy.sh

#!/usr/bin/env bash

#
# script to build docker images and use a polipo proxy if present
# - works well for caching package fetches during apt install, etc
#

set -e
# set -x

container_name="fun_container_99"

SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
cd "${SCRIPTPATH}"

# cache http requests if proxy server is running
# see if the proxy is up
status=0
nc -v -z localhost 8123 || status=$?

if [ "$status" == 0 ] ; then
	# proxy is running
	echo "* using proxy"
	echo ""

	proxy_host=host.docker.internal
	export http_proxy="http://localhost:8123"
	export https_proxy="http://localhost:8123"

	docker build --build-arg http_proxy=http://$proxy_host:8123 \
		--build-arg https_proxy=http://$proxy_host:8123 \
		-t "$container_name" .
else
	# proxy is not running
	echo "* not using proxy"
	echo ""

	docker build -t "$container_name" .
fi

# docker run -it "$container_name"

polipo.conf

diskCacheRoot=/tmp/cache/polipo
logLevel=4

run_polipo.sh

#!/usr/bin/env bash

# runs polipo (https://www.irif.fr/~jch/software/polipo/) with a basic config
#   `brew install polipo` works on OS X to install

set -e

mkdir -p /tmp/cache/polipo
polipo -c polipo.conf