libvirt-check-trim.py: Check machine type & handle diskless VMs

libvirt-check-trim.py

@@ -19,6 +19,16 @@ for domain in conn.listAllDomains():
     xml = domain.XMLDesc()
     tree = objectify.fromstring(xml)
 
+    machine = tree.os.type.get('machine')
+    if machine < 'pc-i440fx-2.1':
+        print('machine should be at least pc-i440fx-2.1')
+        # Might want to check qemu-system-x86_64 -M help for supported
+        # machines.
+
+    if not hasattr(tree.devices, 'disk'):
+        print('(has no disks)')
+        continue
+
     # every disk should be scsi + discard=unmap
     for disk in tree.devices.disk:
         if disk.get('device') != 'disk':