Fact that looks up gid of a certain group

For each gid to lookup, create a ruby file with the following contents in the appropriate location and change the group variable to match the group that should be looked up.

#!/usr/bin/env ruby
# Return the gid of a group

group = 'ftpgroup'

require 'facter'
require 'etc'

Facter.add("gid_#{group}") do
    confine :kernel => :linux
    setcode do
        begin
            Etc.getgrnam(group).gid
        rescue ArgumentError
        end
    end
end

This might be a more elegant approach. It returns all GIDs.

#!/usr/bin/env ruby
## Return the gid of a group 

require 'etc'

Etc.group { |g|
    Facter.add("gid_" + g.name) do
        confine :kernel => :linux
        setcode do
            g.gid   
        end     
    end
}

Another fact that returns each group and its members.

#!/usr/bin/env ruby
## Return a group and its members 

require 'etc'

Etc.group { |g|
    Facter.add("group_" + g.name) do
        confine :kernel => :linux
        setcode do
            g.mem.join(',')   
        end     
    end
}