Reliable way to find out which ruby to use in shebang

StackOverflow https://stackoverflow.com/questions/14161010

  •  13-01-2022
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Question

I wrote a script todo.rb, whose first line is #!/usr/bin/env ruby. However, running this script gives the following error:

λ ~/ ruby todo/todo.rb 
/Users/xjia/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- highline/import (LoadError)
    from /Users/xjia/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from todo/todo.rb:6:in `<main>'

I have already installed the gem highline:

λ ~/ which gem
/Users/xjia/.rvm/rubies/ruby-1.9.3-p0/bin/gem
λ ~/ gem install highline
Successfully installed highline-1.6.15
1 gem installed
Installing ri documentation for highline-1.6.15...
Installing RDoc documentation for highline-1.6.15...
λ ~/ gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.10
  - RUBY VERSION: 1.9.3 (2011-10-30 patchlevel 0) [x86_64-darwin11.2.0]
  - INSTALLATION DIRECTORY: /Users/xjia/.rvm/gems/ruby-1.9.3-p0
  - RUBY EXECUTABLE: /Users/xjia/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/xjia/.rvm/gems/ruby-1.9.3-p0/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-11
  - GEM PATHS:
     - /Users/xjia/.rvm/gems/ruby-1.9.3-p0
     - /Users/xjia/.rvm/gems/ruby-1.9.3-p0@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

and I can require it in irb:

λ ~/ which irb
/Users/xjia/.rvm/rubies/ruby-1.9.3-p0/bin/irb
λ ~/ irb
irb(main):001:0> require 'highline/import'
=> true

However, require in ruby fails exactly the same:

λ ~/ which ruby
ruby: aliased to bundled_ruby
λ ~/ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.2.0]
λ ~/ ruby -e "require 'highline/import'"
/Users/xjia/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- highline/import (LoadError)
    from /Users/xjia/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from -e:1:in `<main>'

I'm using rvm under both Ubuntu and Mac OS X. From my Ubuntu box, this shebang line works fine. However, it sucks under OS X. So what's the reliable way to find out the usable ruby?

Was it helpful?

Solution

The problem is here:

λ ~/ which ruby ruby: aliased to bundled_ruby

you need to check:

which bundled_ruby

and make sure it also has proper shebang:

#!/usr/bin/env ruby

finally removing the alias for ruby should solve the problem, you might want check my gem rubygems-bundler which is by default installed with RVM - it provides more "intelligent" means of detecting and using bundler.

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