[opennebula] make one provider available to fog

lib/fog/bin/opennebula.rb

@@ -0,0 +1,60 @@
+module OpenNebula # deviates from other bin stuff to accomodate gem
+  class << self
+
+    def class_for(key)
+      case key
+      when :compute
+        Fog::Compute::OpenNebula
+      else
+        raise ArgumentError, "Unrecognized service: #{key}"
+      end
+    end
+
+    def [](service)
+      @@connections ||= Hash.new do |hash, key|
+        hash[key] = case key
+        when :compute
+          Fog::Logger.warning("OpenNebula[:compute] is not recommended, use Compute[:opennebula] for portability")
+          Fog::Compute.new(:provider => 'OpenNebula')
+        else
+          raise ArgumentError, "Unrecognized service: #{key.inspect}"
+        end
+      end
+      @@connections[service]
+    end
+
+    def available?
+      begin
+        availability=true unless Gem::Specification::find_by_name("opennebula").nil?
+      rescue Gem::LoadError
+        availability=false
+      rescue
+        availability_gem=Gem.available?("opennebula")
+      end
+
+      if availability
+        for service in services
+          for collection in self.class_for(service).collections
+            unless self.respond_to?(collection)
+              self.class_eval <<-EOS, __FILE__, __LINE__
+                def self.#{collection}
+                  self[:#{service}].#{collection}
+                end
+              EOS
+            end
+          end
+        end
+      end
+      availability
+    end
+
+    def collections
+      services.map {|service| self[service].collections}.flatten.sort_by {|service| service.to_s}
+    end
+
+    def services
+      Fog::OpenNebula.services
+    end
+
+  end
+end