Ruby and Rails “path not found” when installed using RVM on Docker

Question

I'm working on a docker file to create a custom workspace on Codenvy . When I create the workspace everything seems to install correctly but when the workspace open and I enter ruby -v I get:

bash: ruby: command not found

Same for rails:

user@de98ec223612:/projects$ rails -v
bash: rails: command not found

If I type rvm list I get

user@de98ec223612:/projects$ rvm info

ruby-2.4.0:

  system:
    uname:        "Linux de98ec223612 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux"
    name:         "Ubuntu"
    version:      "16.04"
    architecture: "x86_64"
    bash:         "/bin/bash => GNU bash, version 4.3.48(1)-release (x86_64-pc-linux-gnu)"
    zsh:          " => not installed"
    remote path:  "ubuntu/16.04/x86_64"

  rvm:
    version:      "rvm 1.29.1 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io/]"
    updated:      "5 minutes 31 seconds ago"
    path:         "/home/user/.rvm"
    autolibs:     "[4] Allow RVM to use package manager if found, install missing dependencies, install package manager (only OS X)."

  ruby:
    interpreter:  "ruby"
    version:      "2.4.0p0"
    date:         "2016-12-24"
    platform:     "x86_64-linux"
    patchlevel:   "2016-12-24 revision 57164"
    full_version: "ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]"

  homes:
    gem:          "/home/user/.rvm/gems/ruby-2.4.0"
    ruby:         "/home/user/.rvm/rubies/ruby-2.4.0"

binaries:
    ruby:         "/home/user/.rvm/rubies/ruby-2.4.0/bin/ruby"
    irb:          "/home/user/.rvm/rubies/ruby-2.4.0/bin/irb"
    gem:          "/home/user/.rvm/rubies/ruby-2.4.0/bin/gem"
    rake:         "/home/user/.rvm/rubies/ruby-2.4.0/bin/rake"

  environment:
    PATH:         "/home/user/.rvm/gems/ruby-2.4.0/bin:/home/user/.rvm/gems/ruby-2.4.0@global/bin:/home/user/.rvm/rubies/ruby-2.4.0/bin:/usr/lib/jvm/java-1.8.0-open
jdk-amd64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/bundle/bin:/usr/lib/postgresql/9.6/bin:/home/user/.rvm/bin"
    GEM_HOME:     "/home/user/.rvm/gems/ruby-2.4.0"
    GEM_PATH:     "/home/user/.rvm/gems/ruby-2.4.0:/home/user/.rvm/gems/ruby-2.4.0@global"
    MY_RUBY_HOME: "/home/user/.rvm/rubies/ruby-2.4.0"
    IRBRC:        "/home/user/.rvm/rubies/ruby-2.4.0/.irbrc"
    RUBYOPT:      ""
    gemset:       ""

which looks to me like things are installed correctly.

If I type /home/user/.rvm/rubies/ruby-2.4.0/bin/ruby -v it shows the correct ruby version. /home/user/.rvm/rubies/ruby-2.4.0/bin is in the PATH why isn't it being searched?

Here is the relevant portion of my docker file if that helps.

# Install RVM
RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB &&\
    echo progress-bar >> ~/.curlrc &&\
    \curl -sSL https://get.rvm.io | bash -s stable &&\
    /bin/bash -l -c 'source ~/.rvm/scripts/rvm'

# Install Ruby
RUN /bin/bash -l -c 'rvm requirements' &&\
    /bin/bash -l -c 'rvm install ${RUBY_VERSION}' &&\
    /bin/bash -l -c 'rvm use ${RUBY_VERSION} --default' &&\
    /bin/bash -l -c 'rvm rubygems current'

# Install bundler
RUN /bin/bash -l -c 'gem install bundler'

# Install Rails
RUN /bin/bash -l -c 'gem install rails'

RUN echo $PATH

EXPOSE 3000
WORKDIR /projects    

CMD /bin/bash -l -c 'source ~/.rvm/scripts/rvm' && sudo service postgresql start && tail -f /dev/null

How can I get these commands to function without using /home/user/.rvm/rubies/ruby-2.4.0/bin ?

Answer 1

If acceptable to your team it is probably easier to start with the base dockerfile that Eclipse Che provides for RoR: https://github.com/eclipse/che-dockerfiles/blob/master/recipes/ruby_rails/Dockerfile

That should get you the basics and it's kept up-to-date by the community. You can then extend this with any other tools, libraries, deps you need.

Answer 2

I had the same problem and eventually I fixed it by uploading a /root/.bashrc file ending with

source /opt/rvm/scripts/rvm
source /etc/profile.d/ruby.sh

export PATH=$PATH:/opt/rvm/bin

The lines with source, are added by me. The export was added by RVM on install. The rest of my bashrc file is the content that was installed by Debian. I just added these lines.

My ruby.sh file contains

#!/bin/sh
export RUBY_HOME=/opt/rvm/rubies/default

For me, that does the trick. When I login using /bin/bash (non-shell) or via /bin/bash -l -c "command goes here", my commands rvm and ruby both respond. Also, my RUBY_HOME and GEM_PATH, ... are all filled.

My current ruby docker installation can be found here: https://github.com/vindevoy/dockerhub-debian-ruby (sources) https://hub.docker.com/r/vindevoy/debian-ruby/ (image)