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Give Ruby objects superuser privileges
Ruby
branch: master

improve writable_root example

latest commit bcd836420e
Guido De Rosa authored

README.rdoc

Ruby Sudo

Give Ruby objects superuser privileges.

Based on dRuby and sudo.

Only tested with MRI 1.9 .

REQUIREMENTS

Your user must be allowed, in /etc/sudoers, to run ruby and kill commands as root.

A password will be required from the console, or not, depending on the NOPASSWD options in /etc/sudoers.

USAGE

Let's start with a trivial example:

require 'mygem/myclass'
require 'sudo'

obj   = MyGem::MyClass.new

Now, create a Sudo::Wrapper object:

sudo  = Sudo::Wrapper.new

Start the sudo-ed Ruby process:

# 'mygem/myclass' will be automatically required in the 
# sudo DRb server 

sudo.start!

Use it!

sudo[obj].my_instance_method 
sudo[MyClass].my_class_method

When you've done, stop! it. Otherwise, that will be done (only) when the sudo object gets garbage-collected.

sudo.stop!

With a block

Use Sudo::Wrapper::run in this case.

require 'fileutils'
require 'sudo'

Sudo::Wrapper.run do |sudo|
  sudo[FileUtils].mkdir_p '/ONLY/ROOT/CAN/DO/THAT'
end
# Sockets and processes are closed automatically when the block exits

PRINCIPLES OF OPERATION

Spawns a sudo-ed Ruby process running a DRb server. Communication is done via a Unix socket (and, of course, permissions are set to 0600).

No long-running daemons involved, everything is created on demand.

Access control is entirely delegated to sudo.

TODO

sudo has a -A option to accept password via an external program (maybe graphical): support this feature.

CREDITS

AUTHOR

Guido De Rosa.

Sponsored by VEMAR s.a.s.

CONTRIBUTORS

Robert M. Koch.

THANKS

Thanks to Tony Arcieri and Brian Candler for suggestions on ruby-talk.

COPYRIGHT

(The MIT License)

Copyright © 2010, 2011, 2012, 2013 Guido De Rosa

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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