Pack tries to use HTTP proxies running on localhost

[benmoss]

Summary

I run https://github.com/williambailey/pacproxy locally to automatically proxy requests to the right proxy server (confusing, I know).

When I run pack build it tries to use 127.0.0.1 as a proxy from inside the container, since that's what I have set as the http_proxy environment variable.

This doesn't work since the container is running on a virtual network.

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Reproduction

Steps

1. Run a proxy on localhost
2. Use pack build

Current behavior

[builder] failed to fetch dependency: failed to make request: Get "https://artifactory.corp.com/artifactory/golang-release/go1.21.3.linux-amd64.tar.gz": proxyconnect tcp: dial tcp 127.0.0.1:8888: connect: connection refused

Expected behavior

It should just work!

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Environment

pack info

docker info

[benmoss]

benmoss/pack@main...no-localhost-proxying fixes the problem for me, but not sure it's how it should really be fixed

[jjbustamante]

Hi @benmoss

What happen if you don't set any PROXY environment variable?

[benmoss]

@jjbustamante then I can't access other machines on my VPN. I rely on the PROXY env variables to tell tools to connect over a proxy, but for Docker those settings are configured at the VM level.

[benmoss]

Maybe there isn't a universal solution to this, what works for me may break someone else's workflow.