Remove dummy lock functions from lock.py

nilmdb/utils/lock.py

@@ -1,33 +1,20 @@
 # File locking
 
-import warnings
+import fcntl
+import errno
 
-try:
-    import fcntl
-    import errno
+def exclusive_lock(f):
+    """Acquire an exclusive lock.  Returns True on successful
+    lock, or False on error."""
+    try:
+        fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
+    except IOError as e:
+        if e.errno in (errno.EACCES, errno.EAGAIN):
+            return False
+        else:
+            raise
+    return True
 
-    def exclusive_lock(f):
-        """Acquire an exclusive lock.  Returns True on successful
-        lock, or False on error."""
-        try:
-            fcntl.flock(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
-        except IOError as e:
-            if e.errno in (errno.EACCES, errno.EAGAIN):
-                return False
-            else: # pragma: no cover
-                raise
-        return True
-
-    def exclusive_unlock(f):
-        """Release an exclusive lock."""
-        fcntl.flock(f.fileno(), fcntl.LOCK_UN)
-
-except ImportError: # pragma: no cover
-    def exclusive_lock(f):
-        """Dummy lock function -- does not lock!"""
-        warnings.warn("Pretending to lock " + str(f))
-        return True
-
-    def exclusive_unlock(f):
-        """Release an exclusive lock."""
-        return
+def exclusive_unlock(f):
+    """Release an exclusive lock."""
+    fcntl.flock(f.fileno(), fcntl.LOCK_UN)