How to write a procfile that changes directory and respects rbenv?

Question

Given two directories: /a and /b

And /a/.ruby-version has 2.0.0-p353

And /b/.ruby-version has jruby-1.7.9

And the following /a/Procfile

a: ruby --version
b: sh -c 'cd /b && ruby --version'

When I cd /a and run foreman run b

Then I should see jruby 1.7.9 .. etc but instead I see 2.0.0-p353

Answer 1

With the proper sudo permisions, you can do:

b: sudo -u $USER bash -l -c "cd /b && ruby --version"

It's the safest way I know of.