/usr/share/ruby-build/jruby-9.1.0.0 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-9.1.0.0" "https://s3.amazonaws.com/jruby.org/downloads/9.1.0.0/jruby-bin-9.1.0.0.tar.gz#ff48c8eea61d0be93d807f56eda613350e91f598f6f4f71ef73ed53e7d0530ad" jruby
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