diff --git a/code/app.py b/code/app.py
index e277b54..f319d49 100644
--- a/code/app.py
+++ b/code/app.py
@@ -79,7 +79,13 @@ def handle_event(request: GiteaRequest):
     requirements_path = local_repo_dir / pipeline.requirements
     os.system(f'pip install -r {requirements_path}')
     for cmd in pipeline.script:
-        print(cmd)
+        try:
+            os.system(cmd)
+        except Exception as e:
+            raise HTTPException(
+                status_code=503,
+                detail=f'failed running {cmd}: {e}'
+            )
 
     # send response
     raise HTTPException(