Warn and default to null if repo or ref are given

This now means that the system morphology is not altered when chunks are
altered, so some tests had to change.

Since this uses the python warnings API, these warnings can be ignored
by running

    python -W ignore:"stratum morphology" \
           -W ignore:"system morphology" \
           "$(which morph)" ...`

or turned into errors with

    python -W error:"stratum morphology" \
           -W error:"system morphology" \
           "$(which morph)" ...`

1 files changed, 10 insertions, 0 deletions

diff --git a/morphlib/morphologyfactory.py b/morphlib/morphologyfactory.py
index 3462dd36..8a0b047a 100644
--- a/morphlib/morphologyfactory.py
+++ b/morphlib/morphologyfactory.py
@@ -145,6 +145,11 @@ class MorphologyFactory(object):
 
         morphology.needs_artifact_metadata_cached = False
 
+        morphlib.morphloader.MorphologyLoader._validate_stratum_specs_fields(
+            morphology, 'strata')
+        morphlib.morphloader.MorphologyLoader._set_stratum_specs_defaults(
+            morphology, 'strata')
+
     def _check_and_tweak_stratum(self, morphology, reponame, sha1, filename):
         '''Check and tweak a stratum morphology.'''
 
@@ -164,6 +169,11 @@ class MorphologyFactory(object):
         morphology.builds_artifacts = [morphology['name']]
         morphology.needs_artifact_metadata_cached = True
 
+        morphlib.morphloader.MorphologyLoader._validate_stratum_specs_fields(
+            morphology, 'build-depends')
+        morphlib.morphloader.MorphologyLoader._set_stratum_specs_defaults(
+            morphology, 'build-depends')
+
     def _check_and_tweak_chunk(self, morphology, reponame, sha1, filename):
         '''Check and tweak a chunk morphology.'''