Some more cleanup and avoid opening libvirt connections until they're really needed

pvcf.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+import os, sys, libvirt, uuid
+
+#
+# Generic function helpers for PVC
+#
+
+# > lookupByUUID
+# This function is a wrapper for libvirt.lookupByUUID which fixes some problems
+# 1. Takes a text UUID and handles converting it to bytes
+# 2. Disables stdout to avoid stupid printouts
+# 3. Try's it and returns a sensible value if not
+def lookupByUUID(tuuid):
+    dom = None
+
+    # Convert the text UUID to bytes
+    buuid = uuid.UUID(tuuid).bytes
+
+    # Disable stdout
+    sys.stdout = open(os.devnull, 'w')
+
+    # Try
+    try:
+        # Open a libvirt connection
+        libvirt_name = "qemu:///system"
+        conn = libvirt.open(libvirt_name)
+        if conn == None:
+            print('>>> %s - Failed to open local libvirt connection.' % self.domuuid)
+            return dom
+    
+        # Lookup the UUID
+        dom = conn.lookupByUUID(buuid)
+
+        # Close the libvirt connection
+        conn.close()
+    # Fail
+    except:
+        # Close the libvirt connection
+        if conn != None:
+            conn.close()
+
+    # Enable stdout
+    sys.stdout = sys.__stdout__
+
+    # Return the dom object (or None)
+    return dom
+