squid-deb-proxy for docker, because bandwidth is a thing

setup.sh

#!/bin/bash

docker run -it --name squid-deb-proxy-cache -v /var/cache/squid-deb-proxy busybox true
docker run -d --restart=always --name squid-deb-proxy --volumes-from squid-deb-proxy-cache -p 0.0.0.0:48000:8000 pmoust/squid-deb-proxy

top-of-dockerfile

# put this at the top of the dockerfile
# If host is running squid-deb-proxy on port 48000, populate /etc/apt/apt.conf.d/30proxy
# By default, squid-deb-proxy 403s unknown sources, so apt shouldn't proxy ppa.launchpad.net
RUN route -n | awk '/^0.0.0.0/ {print $2}' > /tmp/host_ip.txt
RUN echo -n "GET / HTTP/1.0\n\n" | nc `cat /tmp/host_ip.txt` 48000 \
    && (echo "Acquire::http::Proxy \"http://$(cat /tmp/host_ip.txt):48000\";" > /etc/apt/apt.conf.d/30proxy) \
    && (echo "Acquire::http::Proxy::ppa.launchpad.net DIRECT;" >> /etc/apt/apt.conf.d/30proxy) \
    || echo "No squid-deb-proxy detected on docker host"