r14897: Do more error checking of tdb function returns and raise IOError or

KeyError exceptions as appropriate.

Add a close() function to the wrapper as we can't rely on the
Python garbage collector destroying the object and closing the tdb file
at any particular time.
(This used to be commit a40d6c792257315d1eac955718db5ec1df7e07bb)

source4/scripting/swig/Tdb.py

@@ -39,25 +39,33 @@ class Tdb:
     def __init__(self, name, hash_size = 0, flags = tdb.TDB_DEFAULT,
                  open_flags = os.O_RDWR | os.O_CREAT, mode = 0600):
         self.tdb = tdb.open(name, hash_size, flags, open_flags, mode)
-
+        if self.tdb is None:
+            raise IOError, tdb.errorstr(self.tdb)
+        
     def __del__(self):
-        if hasattr(self, 'tdb'):
-            tdb.close(self.tdb)
+        self.close()
+
+    def close(self):
+        if hasattr(self, 'tdb') and self.tdb is not None:
+            if tdb.close(self.tdb) == -1:
+                raise IOError, tdb.errorstr(self.tdb)
+            self.tdb = None
 
     # Random access to keys, values
 
     def __getitem__(self, key):
         result = tdb.fetch(self.tdb, key)
         if result is None:
-            raise KeyError, key
+            raise KeyError, '%s: %s' % (key, tdb.errorstr(self.tdb))
         return result
 
     def __setitem__(self, key, item):
-        tdb.store(self.tdb, key, item)
+        if tdb.store(self.tdb, key, item) == -1:
+            raise IOError, tdb.errorstr(self.tdb)
 
     def __delitem__(self, key):
         if not tdb.exists(self.tdb, key):
-            raise KeyError, key
+            raise KeyError, '%s: %s' % (key, tdb.errorstr(self.tdb))
         tdb.delete(self.tdb, key)
 
     def has_key(self, key):