Libvirt-Mockup: Add support for getting the boot source target

Prior to this patch the BootSourceOverrideTarget element of the Redfish
template was hardcoded to "Pxe".

Change-Id: Iff300172853e23628da56213081f24c70f0d0959

tools/mockup_server_libvirt/mockup_server_libvirt.py

@@ -28,12 +28,14 @@ app.url_map.strict_slashes = False
 
 LIBVIRT_CONN = None
 
-SET_BOOT_DEVICES_MAP = {
+BOOT_DEVICE_MAP = {
     'Pxe': 'network',
     'Hdd': 'hd',
     'Cd': 'cdrom',
 }
 
+BOOT_DEVICE_MAP_REV = {v: k for k, v in BOOT_DEVICE_MAP.items()}
+
 
 def _get_libvirt_domain(domain):
     try:
@@ -67,17 +69,25 @@ def system_resource(identity):
             # domain to be running
             total_cpus = 0
 
+        # Get the current boot device
+        boot_source_target = None
+        tree = ET.fromstring(domain.XMLDesc())
+        boot_element = tree.find('.//boot')
+        if boot_element is not None:
+            boot_source_target = (
+                BOOT_DEVICE_MAP_REV.get(boot_element.get('dev')))
+
         return flask.render_template(
             'system.json', identity=identity, uuid=domain.UUIDString(),
             power_state=power_state, total_memory_gb=total_memory_gb,
-            total_cpus=total_cpus)
+            total_cpus=total_cpus, boot_source_target=boot_source_target)
 
     elif flask.request.method == 'PATCH':
         boot = flask.request.json.get('Boot')
         if not boot:
             return 'PATCH only works for the Boot element', 400
 
-        target = SET_BOOT_DEVICES_MAP.get(boot.get('BootSourceOverrideTarget'))
+        target = BOOT_DEVICE_MAP.get(boot.get('BootSourceOverrideTarget'))
         if not target:
             return 'Missing the BootSourceOverrideTarget element', 400
 

tools/mockup_server_libvirt/templates/system.json

@@ -20,8 +20,8 @@
     "IndicatorLED": "Off",
     "PowerState": "{{ power_state }}",
     "Boot": {
-        "BootSourceOverrideEnabled": "Once",
-        "BootSourceOverrideTarget": "Pxe",
+        "BootSourceOverrideEnabled": "Continuous",
+        "BootSourceOverrideTarget": "{{ boot_source_target }}",
         "BootSourceOverrideTarget@Redfish.AllowableValues": [
             "Pxe",
             "Cd",