/usr/share/ruby-build/jruby-9.0.0.0.pre2 is in ruby-build 20170726-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | require_java7
install_package "jruby-9.0.0.0.pre2" "https://s3.amazonaws.com/jruby.org/downloads/9.0.0.0.pre2/jruby-bin-9.0.0.0.pre2.tar.gz#6c9fd54c71bb64a04cea2af5938a67eab1ed951609fe999d6de88f6b98a6a1e4" jruby
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