add supports for defining/extracting libvit boot order

lib/fog/libvirt/models/compute/server.rb

@@ -28,6 +28,7 @@ module Fog
         attribute :nics
         attribute :volumes
         attribute :active
+        attribute :boot_order
 
         attribute :state
 
@@ -46,6 +47,7 @@ module Fog
 
         def initialize(attributes={} )
           @xml = attributes.delete(:xml)
+          verify_boot_order(attributes[:boot_order])
           super defaults.merge(attributes)
           initialize_nics
           initialize_volumes
@@ -380,10 +382,23 @@ module Fog
             :iso_dir                => default_iso_dir,
             :network_interface_type => "network",
             :network_nat_network    => "default",
-            :network_bridge_name    => "br0"
+            :network_bridge_name    => "br0",
+            :boot_order             => default_boot_order
           }
         end
 
+        def default_boot_order
+          %w[hd cdrom network]
+        end
+
+        def verify_boot_order order = []
+          if order
+            order.each do |b|
+              raise "invalid boot order, possible values are: hd, network and/or cdrom" unless default_boot_order.include?(b)
+            end
+          end
+        end
+
       end
 
     end

lib/fog/libvirt/models/compute/templates/server.xml.erb

@@ -4,9 +4,8 @@
   <vcpu><%= cpus %></vcpu>
   <os>
     <type arch='<%= arch %>'><%= os_type %></type>
-    <boot dev='hd'/>
-<% if iso_file -%>
-    <boot dev='cdrom'/>
+<% boot_order.each do |dev| -%>
+    <boot dev='<%= dev %>'/>
 <% end -%>
   </os>
   <features>

lib/fog/libvirt/requests/compute/list_domains.rb

@@ -29,6 +29,10 @@ module Fog
           xml_elements(xml, "domain/devices/disk/source", "file")
         end
 
+        def boot_order xml
+          xml_elements(xml, "domain/os/boot", "dev")
+        end
+
         def domain_interfaces xml
           ifs = xml_elements(xml, "domain/devices/interface")
           ifs.map { |i|
@@ -56,6 +60,7 @@ module Fog
             :os_type         => dom.os_type,
             :active          => dom.active?,
             :vnc_port        => vnc_port(dom.xml_desc),
+            :boot_order      => boot_order(dom.xml_desc),
             :nics            => domain_interfaces(dom.xml_desc),
             :volumes_path    => domain_volumes(dom.xml_desc),
             :state           => states[dom.info.state]