Recipe to install RVM locally for a user

[fnichol]

This can be useful for special system users needing more ruby isolation. Main use case here for me is to allow the user running a Hudson/Jenkins instance to add more rubies and spin up gemsets while leaving a system-wide RVM install alone. We might not want to impact a production running passenger or rails stack running while performing CI tasks.

Tentative idea is to have an rvm::user recipe that will iterate over an rvm/user_installs array of system users. Issues to solve are how to set defaults such as default_ruby and gems in some kind of hash that isn't overly complicated.

[fnichol]

For anyone curious, this is about 80% complete. I'm hooking into Chef's popen4 to fork a subprocess as another user to assume their identity. A user attribute needs to be added to all resources and possibly some re-organizing of attributes. I'm trying to minimize breaking changes but it may be worth the pain in the long run.

[fnichol]

All done!

[lock]

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