---
pyanaconda/storage/devicetree.py | 3 +++
pyanaconda/tsort.py | 3 +++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/pyanaconda/storage/devicetree.py b/pyanaconda/storage/devicetree.py
index 1fcfc80..6b6b3e1 100644
--- a/pyanaconda/storage/devicetree.py
+++ b/pyanaconda/storage/devicetree.py
@@ -217,6 +217,9 @@ class DeviceTree(object):
def sortActions(self):
""" Sort actions based on dependencies. """
+ if not self._actions:
+ return
+
edges = []
# collect all ordering requirements for the actions
diff --git a/pyanaconda/tsort.py b/pyanaconda/tsort.py
index 5c6213c..52a871f 100644
--- a/pyanaconda/tsort.py
+++ b/pyanaconda/tsort.py
@@ -27,6 +27,9 @@ class CyclicGraphError(Exception):
def tsort(graph):
order = [] # sorted list of items
+ if not graph or not graph['items']:
+ return order
+
# determine which nodes have no incoming edges
roots = [n for n in graph['items'] if graph['incoming'][n] == 0]
if not roots:
--
1.7.2.3
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