rctneil rctneil - 6 months ago 35
Ruby Question

Install Bundler gem using Ansible

I am trying to install Bundler on my VPS using Ansible.

I already have rbenv set up and the global ruby is 2.1.0.

If I SSH as root into the server and run

gem install bundler
, it installs perfectly.

I have tried the following three ways of using Ansible to install the Bundler gem and all three produce no errors, but when I SSH in and run
gem list
, Bundler is nowhere to be seen.

Attempt 1:

- name: Install Bundler
shell: gem install bundler

Attempt 2:

- name: Install Bundler
shell: gem install bundler

Attempt 3:

- name: Install Bundler
gem: name=bundler

I have also tried the last attempt with
and also with
and neither make any difference.

Any ideas how I can get it to install Bundler correctly via Ansible?

I've been working on this for a little while now and I have 1 ruby version installed: 2.1.0 and ahve found that the shims directory for rbenv does not contain a shim for

Should a shim for
be in there? I'm just getting confused as to why capistrano cannot find the
command as it's listed when I run
sudo gem list
but NOT when I run
gem list

root@weepingangel:/usr/local/rbenv/shims# echo $PATH
root@weepingangel:/usr/local/rbenv/shims# gem environment
RubyGems Environment:
- RUBY VERSION: 2.1.0 (2013-12-25 patchlevel 0) [x86_64-linux]
- INSTALLATION DIRECTORY: /usr/local/rbenv/versions/2.1.0/lib/ruby/gems/2.1.0
- RUBY EXECUTABLE: /usr/local/rbenv/versions/2.1.0/bin/ruby
- EXECUTABLE DIRECTORY: /usr/local/rbenv/versions/2.1.0/bin
- SPEC CACHE DIRECTORY: /root/.gem/specs
- ruby
- x86_64-linux
- /usr/local/rbenv/versions/2.1.0/lib/ruby/gems/2.1.0
- /root/.gem/ruby/2.1.0
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- :sources => ["http://gems.rubyforge.org", "http://gems.github.com"]
- "gem" => "--no-ri --no-rdoc"
- http://gems.rubyforge.org
- http://gems.github.com
- /usr/local/rbenv/versions/2.1.0/bin
- /usr/local/rbenv/libexec
- /usr/local/rbenv/shims
- /usr/local/sbin
- /usr/local/bin
- /usr/sbin
- /usr/bin
- /sbin
- /bin
- /usr/games

Any ideas?

So, I think the two main problems I have:

  1. Why is bundler only visible when I run
    sudo gem list

  2. My deploy is saying:

    INFO [18d5838c] Running /usr/bin/env bundle install --binstubs
    /var/rails_apps/neiltonge/shared/bin --path
    /var/rails_apps/neiltonge/shared/bundle --without development test
    --deployment --quiet on DEBUG [18d5838c] Command: cd /var/rails_apps/neiltonge/releases/20140301205432 && ( PATH=$PATH
    /usr/bin/env bundle install --binstubs
    /var/rails_apps/neiltonge/shared/bin --path
    /var/rails_apps/neiltonge/shared/bundle --without development test
    --deployment --quiet ) DEBUG [18d5838c] /usr/bin/env: bundle: No such file or directory

    and this is my


Why can't bundle be located?


The problem is that, when running gem install bundler via ansible, you're not initializing rbenv properly, since rbenv init is run in .bashrc or .bash_profile. So the gem command used is the system one, not the one installed as a rbenv shim. So whenever you install a gem, it is installed system-wide, not in your rbenv environment.

To have rbenv initialized properly, you must execute bash itself and explicitely state that it's a login shell, so it reads it's initialization files :

ansible your_host -m command -a 'bash -lc "gem install bundler"' -u your_rbenv_user 

Leave the -u your_rbenv_user part if you really want to do this as root.

If the above command works, you can easily turn it into a playbook action :

- name: Install Bundler
  sudo_user: your_rbenv_user
  command: bash -lc "gem install bundler"

It's cumbersome, but it's the only way I found so far.