--- a/configmix/variables.py	Fri Mar 18 09:13:06 2016 +0100
+++ b/configmix/variables.py	Fri Mar 18 09:27:14 2016 +0100
@@ -28,7 +28,17 @@
             return default
 
 
-_varns_registry = {"ENV": _envlookup}
+def _oslookup(name, default=_MARKER):
+    """Lookup an environment variable"""
+    if name == "cwd":
+        return native_os_str_to_text(os.getcwd())
+    raise KeyError("key %r not found in the namespace" % name)
+
+
+_varns_registry = {
+    "ENV": _envlookup,
+    "OS": _oslookup
+}
 
 
 def lookup_varns(name):
@@ -94,3 +104,13 @@
     """
     import passlib.utils
     return passlib.utils.saslprep(v)
+
+
+@filter("normpath")
+def normpath_impl(config, v):
+    return os.path.normpath(v)
+
+
+@filter("abspath")
+def abspath_impl(config, v):
+    return os.path.abspath(v)