Fixed issue with checking the target of an alias

Signed-off-by: Ole Herman Schumacher Elgesem <ole.elgesem@northern.tech>

cfbs/cfbs_config.py

@@ -500,3 +500,15 @@ def _get_all_module_names(self, search_in=("build", "provides", "index")):
 
     def can_reach_dependency(self, name, search_in=("build", "provides", "index")):
         return name in self._get_all_module_names()
+
+    def find_module(self, name, search_in=("build", "provides", "index")):
+        if "build" in search_in and "build" in self:
+            for module in (x for x in self["build"]):
+                if module["name"] == name:
+                    return module
+        if "provides" in search_in and "provides" in self and name in self["provides"]:
+            return self["provides"][name]
+        if "index" in search_in and name in self.index:
+            return self.index[name]
+
+        return None

cfbs/validate.py

@@ -151,7 +151,7 @@ def validate_alias(name, module, context):
             raise CFBSValidationError(
                 name, '"alias" must reference another module in the index'
             )
-        if "alias" in modules[module["alias"]]:
+        if "alias" in config.find_module(module["alias"], search_in):
             raise CFBSValidationError(name, '"alias" cannot reference another alias')
 
     def validate_name(name, module):