1 files changed, 21 insertions, 0 deletions

diff --git a/scripts/lib/checklayer/__init__.py b/scripts/lib/checklayer/__init__.py
index e69a10f452..f91888ccbb 100644
--- a/scripts/lib/checklayer/__init__.py
+++ b/scripts/lib/checklayer/__init__.py
@@ -156,6 +156,27 @@ def _find_layer(depend, layers):
                 return layer
     return None
 
+def sanity_check_layers(layers, logger):
+    """
+    Check that we didn't find duplicate collection names, as the layer that will
+    be used is non-deterministic. The precise check is duplicate collections
+    with different patterns, as the same pattern being repeated won't cause
+    problems.
+    """
+    import collections
+
+    passed = True
+    seen = collections.defaultdict(set)
+    for layer in layers:
+        for name, data in layer.get("collections", {}).items():
+            seen[name].add(data["pattern"])
+
+    for name, patterns in seen.items():
+        if len(patterns) > 1:
+            passed = False
+            logger.error("Collection %s found multiple times: %s" % (name, ", ".join(patterns)))
+    return passed
+
 def get_layer_dependencies(layer, layers, logger):
     def recurse_dependencies(depends, layer, layers, logger, ret = []):
         logger.debug('Processing dependencies %s for layer %s.' % \