Dockerfile

# vim: ft=sh

from ubuntu:precise

# change to fast mirror
# run echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
run echo "deb http://ftp.neowiz.com/ubuntu precise main universe" > /etc/apt/sources.list

# reduce output from debconf
env DEBIAN_FRONTEND noninteractive

# 'apt-get update' always return 0. we should check actually updated.
run apt-get update | tee /tmp/apt-update_output
run ! (grep '^Err' /tmp/apt-update_output) 

run apt-get -y dist-upgrade
run apt-get -y install mail-server^ openssh-server^ postgresql-server^ build-essential libssl-dev libyaml-dev git libtool libxslt-dev libxml2-dev redis-server libpq-dev gawk curl pngcrush python-software-properties

run add-apt-repository -y ppa:nginx/stable
# run echo "deb http://nginx.org/packages/ubuntu precise nginx" >> /etc/apt/sources.list
# run curl http://nginx.org/keys/nginx_signing.key | apt-key add -
run apt-get update
run ! (grep '^Err' /tmp/apt-update_output) 
run apt-get -y install nginx

# add user 'discourse'
run adduser discourse

# Install rvm stable version
run curl -L https://get.rvm.io | bash -s stable

run /usr/local/rvm/bin/rvm-shell && rvm requirements
run /usr/local/rvm/bin/rvm-shell && rvm install 2.0.0-turbo
run /usr/local/rvm/bin/rvm-shell && rvm use 2.0.0-turbo --default
# Install rvm as root.

# run gem install bundler

gistfile1.txt

Step 13 : RUN curl -L https://get.rvm.io | bash -s stable
 ---> Using cache
 ---> 5bb4f7ad9257
Step 14 : RUN /usr/local/rvm/bin/rvm-shell && rvm requirements
 ---> Running in e717aab65bd5
Error build: The command [/bin/sh -c /usr/local/rvm/bin/rvm-shell && rvm requirements] returned a non-zero code: 127
The command [/bin/sh -c /usr/local/rvm/bin/rvm-shell && rvm requirements] returned a non-zero code: 127


 discourse-docker (master) ✗ docklogs  # docklogs: aliased to docker logs $(docker ps -l | tail -1 | tr -s ' ' | cut -d' ' -f1)
/bin/sh: 1: rvm: not found

Or:

RUN /usr/local/rvm/bin/rvm-shell -c "rvm requirements"

The problem with the original line is rvm-shell creates the right environment variables then exits and you lose the environment variables.