Wrong Ruby version used during test invocation with Rbenv + ZSH + Spacemacs

[Dangeranger]

Problem:

When invoking rspec-verify-all from within any spec file using the keybinding CTRL+c , ,, a instead of using the Ruby binary version specified in the .ruby-version located at the project root, rspec-mode is invoking rspec with the default system ruby instead.

Expected behavior:

rspec-mode was expected to invoke rspec with the Ruby version installed via ruby-build at /Users/username/.rbenv/versions/2.2.3/bin/ruby.

Error message:

-*- mode: rspec-compilation; default-directory: "~/Dev/projects/some-project/" -*-
RSpec Compilation started at Tue Aug 29 11:52:40

bundle exec rspec --options /Users/username/Dev/projects/some-project/.rspec /Users/username/Dev/projects/some-project/spec
/Library/Ruby/Site/2.0.0/rubygems.rb:243:in `bin_path': can't find gem bundler (>= 0) (Gem::GemNotFoundException)
    from ./bin/bundle:3:in `<main>'

RSpec Compilation exited abnormally with code 1 at Tue Aug 29 11:52:40

Environment notes:

OS: MacOS Sierra 10.12.6 (16G29)
rbenv version: 1.0.0
ruby-build version: 20170726
emacs version: GNU Emacs 25.1.1 (x86_64-apple-darwin14.5.0, Carbon Version 157 AppKit 1348.17)
spacemacs version:   0.200.9@25.1.1 (spacemacs)

Thanks for your help 👍

[dgutov]

Try https://github.com/purcell/exec-path-from-shell, maybe.

This problem is probably not rspec-mode-specific.

[Dangeranger]

@dgutov Yeah maybe that's possible, I just invoked RSpec from within a Dired buffer by using shell-command with bin/rspecand received

/Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- bundler (LoadError)
	from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	from /Users/username/Dev/projects/project/bin/spring:8:in `<top (required)>'
	from bin/rspec:3:in `load'
	from bin/rspec:3:in `<main>'

[Dangeranger]

Looks like that package is included within the base packages.

https://github.com/syl20bnr/spacemacs/blob/8e1af145480d53e8d32cdff2c83291889903164b/layers/+distributions/spacemacs-base/packages.el#L30

And the function is defined within the packages.el

(defun spacemacs-base/init-exec-path-from-shell ()
  (use-package exec-path-from-shell
    :init (when (or (spacemacs/system-is-mac)
                    (spacemacs/system-is-linux)
                    (memq window-system '(x)))
            (exec-path-from-shell-initialize))))

[Dangeranger]

Created new issue in Spacemacs syl20bnr/spacemacs#9512

[Dangeranger]

@dgutov So I've checked the ruby version used by other packages, specifically inf-ruby-console-rails and found that when using the console from within Emacs, correct Ruby binary and versions are used. rspec-mode seems to be the only package NOT using the rbenv binaries.

For example, M-x ruby-switch-to-inf

Error message when starting an interactive ruby console session from Emacs. Console still starts anyway.

mapcar: Wrong type argument: stringp, ((path . "/Users/username/Dev/projects/project-name/lib"))

Resulting ruby version within the inf-ruby interactive session.

Running via Spring preloader in process 89593
Loading development environment (Rails 4.2.7.1)
[1] pry(main)> => "robe on 49355"
[2] pry(main)> RUBY_VERSION
=> "2.2.3"
[3] pry(main)> 

Results of checking the environment variables from within Emacs

// M-x getenv PATH

=> /Users/username/.rbenv/bin:/Users/username/.rbenv/shims:/Users/mansfield/.exenv/shims: ... rest of path follows

// M-x describe-variable exec-path 

=> exec-path is a variable defined in ‘C source code’.
Its value is
("/Users/username/.rbenv/bin" "/Users/username/.rbenv/shims" ... rest of path)

Original value was 
("/Users/username/.rbenv/bin" "/Users/username/.rbenv/shims" ... rest of path)

  This variable may be risky if used as a file-local variable.

Documentation:
List of directories to search programs to run in subprocesses.
Each element is a string (directory name) or nil (try default directory).

By default the last element of this list is ‘exec-directory’. The
last element is not always used, for example in shell completion
(‘shell-dynamic-complete-command’).

You can customize this variable.

[Dangeranger]

Found a fix, solution below:

Solution:

Within my .zshrc I had initialized rbenv with

# Within ~/.zshrc

# Setup rbenv shims, completion, and path
eval "$(rbenv init -)"

After moving this into my ~/.zshenv instead, restarting my shell, and restarting Spacemacs, rspec-mode found the correct Ruby version managed by rbenv and invoked the tests as expected.

# Within ~/.zshenv

## Default PATH foundation
PATH=/usr/local/bin:/usr/local/sbin:...lots-more-dirs-here...$PATH;
export PATH

# Setup rbenv shims, completion, and path
eval "$(rbenv init -)"

[dgutov]

Ouch, zsh.

I just put the rbenv config into ~/.profile. On Ubuntu, that is.

[Dangeranger]

It's my fault for not paying attention to how Emacs invokes your environment as it boots. The strange part is that non of the other packages exhibit this problem.
🤷‍♂️

[dgutov]

If we're talking about inf-ruby, then Spring might be calling the shell, and perform initialization doing that... IDK.