OpenNebula

I've stumbled upon a problem where OpenNebulaNetwork.rb fails to determine the kind of hypervisor. I got the following (related) info in the log:

Fri Dec 30 14:05:17 2011 [VMM][I]: Command execution fail: /var/tmp/one/vnm/ovswitch/post base64-data-I-cut-away one-40
Fri Dec 30 14:05:17 2011 [VMM][I]: /var/tmp/one/vnm/ovswitch/../OpenNebulaNic.rb:29:in `new_nic': undefined method `new' for nil:NilClass (NoMethodError)
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:60:in `initialize'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /usr/lib/ruby/1.8/rexml/element.rb:892:in `each'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /usr/lib/ruby/1.8/rexml/xpath.rb:53:in `each'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /usr/lib/ruby/1.8/rexml/element.rb:892:in `each'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:59:in `initialize'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:110:in `new'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:110:in `initialize'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/OpenvSwitch.rb:23:in `initialize'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:100:in `new'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/../OpenNebulaNetwork.rb:100:in `from_base64'
Fri Dec 30 14:05:17 2011 [VMM][I]: from /var/tmp/one/vnm/ovswitch/post:28
Fri Dec 30 14:05:17 2011 [VMM][I]: ExitCode: 1
Fri Dec 30 14:05:17 2011 [VMM][I]: Failed to execute network driver operation: post.
Fri Dec 30 14:05:17 2011 [VMM][E]: Error deploying virtual machine

I found a solution. I edited the detect_hypervisor function to look like this:

    def detect_hypervisor
        uname_a = `uname -a`
        grepxen = `cat /proc/xen/capabilities | grep -c control_d`
        lsmod   = `#{COMMANDS[:lsmod]}`

        if uname_a.match(/xen/i)
            "xen" 
        elsif grepxen.match(/1/i)
            "xen" 
        elsif lsmod.match(/kvm/)
            "kvm" 
        end
    end

It's the "grepxen"-lines that are new. I think they should be injected into the tree.

I don't know what version I should select, I used 3.1.90