Rbenv

[Arcath]

tl;dr Makes life much easier for those of us using rbenv.

The problem was that ~/.bash_profile wasn't being pulled in which required the use of bundle_bin to get bundler to work and in some cases even resulted in the ruby command not being found, which was the case on a new production server I've had to setup up.

This change causes source ~/.bash_profile to be added as the first command run in the ssh session which results in:

$ mina deploy --verbose

-----> Loading rbenv
       $ source ~/.bash_profile

-----> Creating a temporary build path
       $ touch "deploy.lock"

It also adds a task for checking the ruby version (for debugging only):

invoke :'rbenv:ruby_version'

which appears like this in the output:

-----> Checking Ruby version
       $ ruby -v
       ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]

For rbenv users this render the need for bundle_bin and any other patches redundant and only needs tem to add

require 'mina/rbenv'

to the top of their config/deploy.rb

[rstacruz]

Hm, I'm not sure about the idea of sourcing ~/.bash_profile. Profile files are usually made for interactive shells, and will cause problems in some setups. For instance, I have my profile set up on some servers to automatically show some system info when I log in. These will be executed every time I run a Mina task, which I don't want to happen.

A better solution may be:

1. Use export PATH="${HOME}/.rbenv/shims:${PATH}" instead, which is the line injected to ~/.bash_profile that makes RVM work, or
2. Use a prefix rbenv exec for all Ruby commands.

I kind of like #1, but I don't want it to be built-in assumption that can't be changed.

cc @mikong

[rstacruz]

I think a better solution would be to implement a special task that is executed for every Mina task that's meant to set up the environment:

task :environment do
  queue echo_cmd %[export PATH="${HOME}/.rbenv/shims:${PATH}"]
end

Or much nicer this way:

require 'mina/rbenv'
task :environment => [ 'rbenv:load' ]

# In mina/rbenv.rb:
task :'rbenv:load' do
  queue echo_cmd %[export PATH="${HOME}/.rbenv/shims:${PATH}"]
end

Also, Rake supports defining tasks multiple times and they all get executed in serial, which lends very well to this standard.

We may even be able to add explicit support for RVM by making an rvm:load task which loads ~/.rvm/scripts/rvm.

require 'mina/rvm'
task :environment => [ "rvm:load[1.9.3-p142@project]" ]

# In mina/rvm.rb:
task :'rvm:load[gemset]' do |t, args|
  queue echo_cmd %[source "$HOME/.rvm/scripts/rvm"]
  queue echo_cmd %[rvm use "#{gemset}"]
end

Related #5. cc @mikong.