grouptools.py: Don't allow non-string arguments

Since we want to do string operations on the inputs to the various
grouptools modules assert that the inputs are in fact strings not other
things.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/framework/grouptools.py b/framework/grouptools.py
index 74b75a335..7a7a12733 100644
--- a/framework/grouptools.py
+++ b/framework/grouptools.py
@@ -44,6 +44,7 @@ __all__ = [
 
 def _assert_illegal(group):
     """Helper that checks for illegal characters in input."""
+    assert isinstance(group, (str, unicode)), 'Type must be string or unicode'
     assert '\\' not in group, \
         'Groups are not paths and cannot contain \\.  ({})'.format(group)
     assert not group.startswith('/'), \
@@ -103,6 +104,8 @@ def join(*args):
 
     """
     for group in args:
+        assert isinstance(group, (str, unicode)), \
+            'Type must be string or unicode'
         assert '\\' not in group, \
             'Groups are not paths and cannot contain \\.  ({})'.format(group)
     assert not args[0].startswith('/'), \
@@ -149,6 +152,7 @@ def from_path(path):
     This safely handles both Windows and Unix style paths.
 
     """
+    assert isinstance(path, (str, unicode)), 'Type must be string or unicode'
     assert not path.startswith('/'), \
         'Groups cannot start with /. ({})' .format(path)