[virt-manager v3]Add virtio-scsi disk bus option

[Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>]

From: ChenHanxiao <chenhanxiao@xxxxxxxxxxxxxx>

This patch will add virtio-scsi bus option on "Add New Virtual
Hardware" GUI page. It will support users to add a virtual disk
using SCSI bus with a controller model virtio-scsi.
If there is no SCSI controller existed, a new SCSI controller by
model 'virtio-scsi' will be added automatically.

Signed-off-by: ChenHanxiao <chenhanxiao@xxxxxxxxxxxxxx>

diff --git a/src/virtManager/addhardware.py b/src/virtManager/addhardware.py
index 4d894eb..f0b8319 100644
--- a/src/virtManager/addhardware.py
+++ b/src/virtManager/addhardware.py
@@ -34,6 +34,7 @@ import virtManager.uihelpers as uihelpers
 from virtManager.asyncjob import vmmAsyncJob
 from virtManager.storagebrowse import vmmStorageBrowser
 from virtManager.baseclass import vmmGObjectUI
+from virtinst.VirtualController import VirtualControllerSCSI    
 
 PAGE_ERROR = 0
 PAGE_DISK = 1
@@ -539,6 +540,8 @@ class vmmAddHardware(vmmGObjectUI):
         if self.vm.get_hv_type() == "kvm":
             add_dev("sata", virtinst.VirtualDisk.DEVICE_DISK, "SATA disk")
             add_dev("virtio", virtinst.VirtualDisk.DEVICE_DISK, "Virtio disk")
+            add_dev("virtio-scsi", virtinst.VirtualDisk.DEVICE_DISK, 
+                "Virtio SCSI disk")
         if self.conn.is_xen():
             add_dev("xen", virtinst.VirtualDisk.DEVICE_DISK, "Virtual disk")
 
@@ -1151,10 +1154,16 @@ class vmmAddHardware(vmmGObjectUI):
 
         self._dev.get_xml_config()
         logging.debug("Adding device:\n" + self._dev.get_xml_config())
+        if self.has_controller():  
+            if self._controller is not None:
+                logging.debug("Adding controller:\n" 
+                            + self._controller.get_xml_config())
 
         # Hotplug device
         attach_err = False
         try:
+            if self.has_controller() and self._controller is not None:
+                self.vm.attach_device(self._controller)    
             self.vm.attach_device(self._dev)
         except Exception, e:
             logging.debug("Device could not be hotplugged: %s", str(e))
@@ -1176,6 +1185,13 @@ class vmmAddHardware(vmmGObjectUI):
                 return (False, None)
 
         # Alter persistent config
+        if self.has_controller() and self._controller is not None:
+            try:
+                self.vm.add_device(self._controller)    
+            except Excpetion, e:
+                self.err.show_err(_("Error adding device: %s" % str(e)))
+                return (True, None)
+
         try:
             self.vm.add_device(self._dev)
         except Exception, e:
@@ -1184,6 +1200,14 @@ class vmmAddHardware(vmmGObjectUI):
 
         return (False, None)
 
+    #check whether device has attribute '_controller'
+    def has_controller(self):  
+        try:
+            self._controller
+        except AttributeError:
+            return False
+        else:
+            return True
 
     ###########################
     # Page validation methods #
@@ -1222,6 +1246,10 @@ class vmmAddHardware(vmmGObjectUI):
         bus, device = self.get_config_disk_target()
         cache = self.get_config_disk_cache()
         fmt = self.get_config_disk_format()
+        model = None
+        if bus == "virtio-scsi":
+           bus = "scsi"
+           model = "virtio-scsi"
 
         # Make sure default pool is running
         if self.is_default_storage():
@@ -1271,6 +1299,7 @@ class vmmAddHardware(vmmGObjectUI):
                                         device=device,
                                         bus=bus,
                                         driverCache=cache,
+                                        model=model,
                                         format=fmt)
 
             if not fmt:
@@ -1316,6 +1345,15 @@ class vmmAddHardware(vmmGObjectUI):
         uihelpers.check_path_search_for_qemu(self.topwin,
                                              self.conn, disk.path)
 
+        if disk.model == "virtio-scsi": 
+            controllers = self.vm.get_controller_devices()
+            controller = VirtualControllerSCSI(conn = self.conn.vmm)
+            controller.set_model(disk.model)
+            self._controller = controller
+            for d in controllers:
+                if disk.model == d.model:
+                   self._controller = None
+
         self._dev = disk
         return True
 
-- 
1.7.1

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