Bug 1609116 - Activate warnings for rustfmt on code review mode, r=ahal

Differential Revision: https://phabricator.services.mozilla.com/D59859

--HG--
extra : moz-landing-system : lando

python/mozlint/mozlint/roller.py

@@ -49,6 +49,11 @@ def _run_worker(config, paths, **lintargs):
     if SHUTDOWN:
         return result
 
+    # Override warnings setup for code review
+    # Only activating when code_review_warnings is set on a linter.yml in use
+    if os.environ.get('CODE_REVIEW') == '1' and config.get('code_review_warnings'):
+        lintargs['show_warnings'] = True
+
     func = supported_types[config['type']]
     start_time = time.time()
     try:

tools/lint/rustfmt.yml

@@ -48,3 +48,4 @@ rust:
         - 'tools/lint/rust/**'
     type: external
     payload: rust:lint
+    code_review_warnings: true