ExecJS::RuntimeError running the Getting Started with Rails blog on cygwin (windows7)

Question

I am trying to run the Getting Started with Rails blog on cygwin (windows7). I get the following error message:

ExecJS:: RuntimeError in Welcome#index

module.js:340
    throw err;
          ^
Error: Cannot find module 'C:\tmp\execjs20130903-50672-1vn7gqc.js'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:901:3

  (in /usr/lib/ruby/gems/1.9.1/gems/turbolinks-1.3.0/lib/assets/javascripts   /turbolinks.js.coffee)

node is installed.

This is after

$rails generate controller welcome index
$rails s

I am running Rails 4.0 on cygwin Any ideas why this might be happening?

Thanks

umbregachoong

If you replace Node.js by the rubyracer gem, does it change anything? (I wouldn't expect it to solve the issue but just in case it does...) — Raindal
– Raindal, Commented Sep 3, 2013 at 20:08

Yumecosmos · Accepted Answer · 2014-04-02 19:55:17Z

2

I encountered this error and it had to do with the path to the temp file being wrong. I was able to fix it by changing the following two files in \gems\[ruby version]\gems\execjs-2.0.2\lib\execjs. (Possibly found in \usr\lib\ruby\, but that depends on how your Ruby is installed. I'm using RVM so mine is different.)

external_runtime.rb

compile_to_tempfile(source) do |file|
     extract_result(@runtime.send(:exec_runtime, file.path))
  end
end

should change to

compile_to_tempfile(source) do |file|
    filepath = file.path
    if ExecJS.cygwin? && @runtime.name == "JScript"
      IO.popen("cygpath -m " + file.path) { |f| filepath = f.read }
      filepath = filepath.gsub("\n","")
    end
    extract_result(@runtime.send(:exec_runtime, filepath))
  end
end

module.rb

Add this right before the last two ends.

def cygwin?
  @cygwin ||= RbConfig::CONFIG["host_os"] =~ /cygwin/
end

After this restart your Rails server and with any luck it should work.

Source: https://github.com/sstephenson/execjs/issues/78

answered Apr 2, 2014 at 19:55

Yumecosmos

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1 Comment

zelanix Over a year ago

Brilliant! I had a similar issue with execjs v2.2.0 on Cgywin, and although the exact implementation there is slightly different, the principle is identical! Thank you. +1

Arihant Jain · Accepted Answer · 2017-11-16 13:55:04Z

0

don't do anything just go to application/assets/javascript/application.js and remove

'//'

from

//=require turbolinks

to

=require turbolinks

that will basically uncomment the line from the file This step made my work done when i faced similar error in Default rails server going through RAILS Tutorial. I am using Windows 10 PC and this solved my case

answered Nov 16, 2017 at 13:55

Arihant Jain

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