OpenNebula

I am using Debian 8 with Xen4.4.

The command.rb file has:

        def self.get_xen_command
            if system("ps axuww | grep -v grep | grep '\\bxen\\b'")
                "sudo xm" 
            else
                "sudo xl" 
            end
        end

If we run this "grep" command in a Xen4.4 box, with XL as toolstack we get:

irb(main):001:0> system("ps axuww | grep -v grep | grep '\\bxen\\b'")
root      1040  0.0  0.0  10876  2172 ?        SL   Jun19   0:28 /usr/lib/xen-4.4/bin/xenstored --pid-file=/var/run/xenstore.pid
root      1062  0.0  0.0  90868  2008 ?        SLl  Jun19   0:00 /usr/lib/xen-4.4/bin/xenconsoled --pid-file=/var/run/xenconsoled.pid
oneadmin  4815  1.5  0.0  36948  9232 ?        Sl   14:51   0:00 ruby ./xen.rb xen4-probes /opt/datastores 4124 20 11 sersic-dom0.um.nugg.ad
root      4818  0.0  0.0  19392  1944 ?        SL   14:51   0:00 /usr/lib/xen-4.4/bin/xentop -bi2
=> true

So it is wrongly selecting XM as toolstack instead of XL. I assume it is trying to figure out if there is a xen daemon, but that is also a wrong way yo go since you can use "xm" in Xen4 too.

In my box, there is a /usr/sbin/xen command that automatically selects the right toolstack (using /usr/lib/xen-common/bin/xen-toolstack), but I am not sure if this can be relied upon cross-distribution and cross-version. This xen-toolstack script looks in /etc/default/xen for the configured toolstack or fails back to defaults (xm in preference to xl if both are found). OpenNebula should implement a similar approach or rely in the xen-provided tooling if available.