Add an fs.inafs function for determining if a path is in AFS at all.

Signed-off-by: Evan Broder <broder@mit.edu>

diff --git a/afs/fs.py b/afs/fs.py
index 0044c05..a90cd4c 100644 (file)
--- a/afs/fs.py
+++ b/afs/fs.py
@@ -1,2 +1,13 @@
+import errno

 import _fs
 from _fs import whichcell
 import _fs
 from _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