buildman: mark missing buildargs as failure

buildman/component/buildcomponent.py

@@ -94,6 +94,7 @@ class BuildComponent(BaseComponent):
       build_config = build_job.build_config
     except BuildJobLoadException as irbe:
       self._build_failure('Could not load build job information', irbe)
+      raise Return()
 
     base_image_information = {}
 
@@ -141,6 +142,14 @@ class BuildComponent(BaseComponent):
         'private_key': build_job.repo_build.trigger.private_key,
       }
 
+    # If the build args have no buildpack, mark it as a failure before sending
+    # it to a builder instance.
+    if not build_arguments['build_package'] and not build_arguments['git']:
+      logger.error('%s: insufficient build args: %s',
+                   self._current_job.repo_build.uuid, build_arguments)
+      self._build_failure('Insufficient build arguments. No buildpack available.')
+      raise Return()
+
     # Invoke the build.
     logger.debug('Invoking build: %s', self.builder_realm)
     logger.debug('With Arguments: %s', build_arguments)