Install rvm and Ruby
$ sparrow plg install rvm
$ sparrow plg run rvm # install rvm with default Ruby
$ sparrow plg run rvm --param ruby_version=2.1.2 # install specific Ruby version
$ cat sparrowfile
task-run "install rvm and ruby 2.2.2", "rvm", %(
ruby_version => "2.2.2"
);
Alexey Melezhik