Severin Severin - 4 months ago 107
Ruby Question

Gitlab CI setup error - Could not find a JavaScript runtime

I am trying to setup Gitlab CI for my Ruby on Rails project, but ran into an error that I don't know how to fix.

The application is running on Ruby 2.3.1, Rails 5.0 and is using a postgreSQL database.

My current .gitlab.ci.yml file looks like this:

# https://hub.docker.com/r/library/ruby/tags/
image: "ruby:2.3.0"

# Pick zero or more services to be used on all builds.
# Only needed when using a docker container to run your tests in.
# Check out: http://docs.gitlab.com/ce/ci/docker/using_docker_images.html#what-is-service
services:
- redis:latest
- postgres:latest
- node:latest

# This is a basic example for a gem or script which doesn't use
# services such as redis or postgres
before_script:
- gem install bundler # Bundler is not installed with the image
- bundle install -j $(nproc) # Install dependencies

rubocop:
script:
- rubocop

rspec:
script:
- rspec spec

rails:
script:
- rails db:migrate
- rspec spec


So it's supposed to be using NodeJS as runtime. However, I get the following error:

$ rails db:migrate
rails aborted!
Bundler::GemRequireError: There was an error while trying to load the gem 'uglifier'.
Gem Load Error is: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
Backtrace for gem load error is:
/usr/local/bundle/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect'
/usr/local/bundle/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:ExecJS>'
/usr/local/bundle/gems/execjs-2.7.0/lib/execjs.rb:4:in `<top (required)>'
/usr/local/bundle/gems/activesupport-5.0.0.rc2/lib/active_support/dependencies.rb:293:in `require'
/usr/local/bundle/gems/activesupport-5.0.0.rc2/lib/active_support/dependencies.rb:293:in `block in require'
/usr/local/bundle/gems/activesupport-5.0.0.rc2/lib/active_support/dependencies.rb:259:in `load_dependency'
/usr/local/bundle/gems/activesupport-5.0.0.rc2/lib/active_support/dependencies.rb:293:in `require'
/usr/local/bundle/gems/uglifier-3.0.0/lib/uglifier.rb:5:in `<top (required)>'

Answer

You need javascript runtime (nodejs), install them.

Ubuntu Users

sudo apt-get install nodejs

CentOS/RedHat Users

sudo yum install nodejs

If you can't install nodejs you can use therubyracer gem. Description from repository:

Embed the V8 JavaScript interpreter into Ruby.

Add this lines to Gemfile

gem 'therubyracer', platforms: :ruby
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