Avoid self-dependencies, do not add dependencies multiple times.

1 files changed, 4 insertions, 2 deletions

diff --git a/morphlib/builddependencygraph.py b/morphlib/builddependencygraph.py
index b75eab84..90c4f084 100644
--- a/morphlib/builddependencygraph.py
+++ b/morphlib/builddependencygraph.py
@@ -183,12 +183,14 @@ class BuildDependencyGraph(object): # pragma: no cover
                 # chunks with no build-depends implicitly depend on all
                 # chunks listed earlier in the same stratum
                 for dependency in stratum_chunks:
-                    chunk.add_dependency(dependency)
+                    if not dependency is chunk:
+                        chunk.add_dependency(dependency)
             elif isinstance(build_depends, list):
                 for depname in build_depends:
                     if depname in name_to_chunk:
                         dependency = name_to_chunk[depname]
-                        chunk.add_dependency(dependency)
+                        if not dependency is chunk:
+                            chunk.add_dependency(dependency)
                     else:
                         raise Exception('%s: source %s references %s before '
                                         'it is defined' %