Fixed issue when adding modules that were already added

cfbs/core.py

@@ -423,7 +423,10 @@ def _find_dependencies(self, modules, exclude):
         return dependencies
 
     def _add_without_dependencies(self, modules):
-        assert modules and len(modules) > 0 and modules[0]["name"]
+        assert modules
+        assert len(modules) > 0
+        assert modules[0]["name"]
+
         for module in modules:
             name = module["name"]
             assert name not in (m["name"] for m in self["build"])
@@ -457,6 +460,8 @@ def _add_modules(
 
         # Filter modules which are already added:
         names = self._filter_modules_to_add(names)
+        if not names:
+            return 0  # Everything already added
 
         # Convert names to objects:
         modules_to_add = [index.get_module_object(m, added_by[m]) for m in names]

test/shell/add_all.sh

@@ -0,0 +1,16 @@
+# This test is quite slow and makes many API requests,
+# so not included in the normal sequence.
+# We do something very similar in the index repo.
+
+set -e
+set -x
+cd test
+mkdir -p ./tmp/
+cd ./tmp/
+touch cfbs.json && rm cfbs.json
+
+cfbs init
+cfbs add masterfiles
+cfbs search | awk '{print $1}' | xargs -n1 cfbs add
+
+cfbs build