/usr/lib/ruby/vendor_ruby/rails/ruby_version_check.rb is in ruby-railties 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | if RUBY_VERSION < '1.9.3'
desc = defined?(RUBY_DESCRIPTION) ? RUBY_DESCRIPTION : "ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE})"
abort <<-end_message
Rails 4 prefers to run on Ruby 2.1 or newer.
You're running
#{desc}
Please upgrade to Ruby 1.9.3 or newer to continue.
end_message
end
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