Use overlayfs when building systems

This will allow us to cache systems as a list of chunks and a small
filesystem delta, rather than a massive tarball.

1 files changed, 15 insertions, 1 deletions

diff --git a/morphlib/stagingarea_tests.py b/morphlib/stagingarea_tests.py
index dc43e4f6..f64cf2d4 100644
--- a/morphlib/stagingarea_tests.py
+++ b/morphlib/stagingarea_tests.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2014  Codethink Limited
+# Copyright (C) 2012-2015  Codethink Limited
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -119,6 +119,20 @@ class StagingAreaTests(unittest.TestCase):
         self.assertEqual(self.created_dirs, [dirname])
         self.assertTrue(dirname.startswith(self.staging))
 
+    def test_creates_overlay_upper_directory(self):
+        source = FakeSource()
+        self.sa._mkdir = self.fake_mkdir
+        dirname = self.sa.overlay_upperdir(source)
+        self.assertEqual(self.created_dirs, [dirname])
+        self.assertTrue(dirname.startswith(self.staging))
+
+    def test_creates_overlay_directory(self):
+        source = FakeSource()
+        self.sa._mkdir = self.fake_mkdir
+        dirname = self.sa.overlaydir(source)
+        self.assertEqual(self.created_dirs, [dirname])
+        self.assertTrue(dirname.startswith(self.staging))
+
     def test_makes_relative_name(self):
         filename = os.path.join(self.staging, 'foobar')
         self.assertEqual(self.sa.relative(filename), '/foobar')