Bundler and Docker install as non-root

[Pier-Olivier Thibault]

I'm trying to run a sane docker container by not installing everything in root user. Here's what my config looks like:

Dockerfile

=======

  FROM ruby:2.2

  RUN apt-get update -qq && apt-get install -y build-essential

  RUN apt-get install -y libpq-dev

  RUN apt-get install -y libxml2-dev libxslt1-dev

  RUN apt-get install -y nodejs

  RUN groupadd -r web && useradd -r -g web -d /srv/pothibo.com ecrire

  COPY . /srv/pothibo.com

  RUN chown -R ecrire /srv/pothibo.com

  WORKDIR /srv/pothibo.com

  USER ecrire

  RUN bundle install --deployment --path=.bundle

=====

Now when I built this image here's the error I get

  Error details

    Errno::EACCES: Permission denied @ rb_sysopen - /usr/local/bundle/config

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/settings.rb:210:in `initialize'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/settings.rb:210:in `open'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/settings.rb:210:in `set_key'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/settings.rb:31:in `[]='

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/cli/install.rb:76:in `run'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/cli.rb:162:in `install'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/cli.rb:10:in `start'

      /usr/local/bundle/gems/bundler-1.10.4/bin/bundle:20:in `block in <top (required)>'

      /usr/local/bundle/gems/bundler-1.10.4/lib/bundler/friendly_errors.rb:7:in `with_friendly_errors'

      /usr/local/bundle/gems/bundler-1.10.4/bin/bundle:18:in `<top (required)>'

      /usr/local/bundle/bin/bundle:23:in `load'

      /usr/local/bundle/bin/bundle:23:in `<main>'

I've read settings.rb enough to understand it and I don't understand as settings.rb looks for local_config_file and I don't see how that can be /usr/local/bundle/config

Can someone help me?

[Tim Moore]

It looks like that base Docker image sets the config file location to /usr/local/bundle/config via the BUNDLE_APP_CONFIG environment variable.

https://github.com/docker-library/ruby/blob/master/2.2/Dockerfile#L39

(which is read by Bundler here https://github.com/bundler/bundler/blob/07942d1a9f9ca44d9d93a677a662d4c2dbca6f6c/lib/bundler.rb#L217)

You should be able to override that in your own Dockerfile.

Cheers,

Tim

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