Pass basic-auth credentials to child images

[jmreicha]

Is your feature request related to a problem? Please describe.

When attempting to get basic auth working with the satispress plugin I am running into some issues.

As part of my build process I do composer update and then, docker build . --file Dockerfile --tag image:tag and it works well, but when I attempt to add packages using satispress with composer and an accompanying auth.json that sits next to composer.json for basic-auth I get the following error.

 [Composer\Downloader\TransportException]                                                                 
  The 'https://mydomain.com/satispress/affiliate-wp/2.6.3' URL required authentication.  
  You must be using the interactive console to authenticate                                                
                                                                                                           

install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--no-suggest] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--ignore-platform-reqs] [--] [<packages>]...

The command '/bin/bash -o pipefail -c composer install --no-dev --no-interaction --no-progress --no-ansi --no-scripts' returned a non-zero code: 255

I'm thinking auth credentials are never picked up as part of the build. It looks like there is a way to set up the auth with the COMPOSER_AUTH environment variable as part of the build but don't know if there is a way to inject this into the Docker build.

Describe the solution you'd like

Ideally a build arg for enabling a way to pass COMPOSER_AUTH with specified credentials in the child Dockerfile. Something like docker build . --file Dockerfile --build-arg COMPOSER_AUTH='{"http-basic": {"domain": {"username": "abc", "password": "123"}}}' --tag image:tag and something in the Dockerfile for passing the onbuild env.

It looks like passing this arg should be possible using this approach.

Additional context

I originally opened an issue in the stack-example-bedrock repo but it looks like that is probably not the best place for it. I'm still parsing through the repo trying to understand how everything is built so I can try testing this locally.

[jmreicha]

I have not had any success injecting the auth config as an environment variable with build args, BUT I was able to modify the upstream Docker image and get the basic-auth working by injecting a local auth.json file into the Dockerfile on this line.

I don't think this is a viable solution though, because the build fails if there is no auth.json file present in the bedrock repo that composer generates. Not sure if there is a way around that.

[jmreicha]

Just opened https://github.com/presslabs/stack-runtimes/pull/45. I think this should be enough to address the original issue?