Question

I’m sure this question is an easy one for Ruby users. However for me this is a issue I can’t figure out by myself.

My goal is to use a script included in the Puppet archive (ext/nagios/check_puppet.rb) on a Ubuntu-10.4 system.

I try to launch the script:

$ sudo ./check_puppet.rb
./check_puppet.rb:4:in `require': no such file to load -- sys/proctable (LoadError)
        from ./check_puppet.rb:4

Ok so there’s something missing. I fount out I need some library called sys-proctable available at http://raa.ruby-lang.org/project/sys-proctable/

wget http://rubyforge.org/frs/download.php/65609/sys-proctable-0.9.0-x86-linux.gem
[...]
sudo apt-get install rubygems
[...]
$ sudo gem install sys-proctable-0.9.0-x86-linux.gem
Successfully installed sys-proctable-0.9.0-x86-linux
1 gem installed
Installing ri documentation for sys-proctable-0.9.0-x86-linux...
Installing RDoc documentation for sys-proctable-0.9.0-x86-linux...

Everything looks pretty good so far! Time to launch the script again

$ sudo ./check_puppet.rb
./check_puppet.rb:4:in `require': no such file to load -- sys/proctable (LoadError)
        from ./check_puppet.rb:4

the gem listoutput tells me this:

$ gem list

*** LOCAL GEMS ***

sys-proctable (0.9.0)

• Where has this gem been installed?
• Why can’t the script load the sys-proctable lib?
• What the %&$@ am I doing wrong?
• Where’s the official doc of gem?

Answer 1

The gem is installed – but in Ruby 1.8 you need to have the line:

require 'rubygems'

To use rubygems. This changes the ‘require’ function so it will pull in rubygems when you ask it to.

So in the script:

https://github.com/puppetlabs/puppet/blob/master/ext/nagios/check_puppet.rb

Just add the require near the top and try again.

For instructions on other ways to use rubygems, consult the Rubygems documentation:

http://docs.rubygems.org/read/chapter/3#page70