-import _fs
-from _fs import whichcell
+import errno
+from afs import _fs
+from afs._fs import whichcell
+
+def inafs(path):
+ """Return True if a path is in AFS."""
+ try:
+ whichcell(path)
+ except OSError, e:
+ if e.errno in (errno.EINVAL, errno.ENOENT):
+ return False
+
+ return True