error bridge veth

backend/src/utilities/capture_pipeline.py

@@ -13,6 +13,21 @@ from src.config import settings
 logger = logging.getLogger("capture_pipeline")
 
 
+def _run_checked(cmd: list[str]) -> subprocess.CompletedProcess[str]:
+    """Run a command and surface stdout/stderr in raised errors."""
+    try:
+        return subprocess.run(cmd, check=True, capture_output=True, text=True)
+    except subprocess.CalledProcessError as exc:
+        stdout = (exc.stdout or "").strip()
+        stderr = (exc.stderr or "").strip()
+        if stdout:
+            logger.error("Command stdout for %s:\n%s", cmd[0], stdout)
+        if stderr:
+            logger.error("Command stderr for %s:\n%s", cmd[0], stderr)
+        detail = stderr or stdout or str(exc)
+        raise RuntimeError(detail) from exc
+
+
 class CapturePipelineManager:
     """Reference-count mirrored capture pipelines per bridge."""
 
@@ -107,7 +122,7 @@ class CapturePipelineManager:
             mirror_if,
             capture_if,
         )
-        subprocess.run(cmd, check=True, capture_output=True, text=True)
+        _run_checked(cmd)
         self._active[bridge] = {
             "mirror_if": mirror_if,
             "capture_if": capture_if,
@@ -134,7 +149,7 @@ class CapturePipelineManager:
             mirror_if,
             capture_if,
         )
-        subprocess.run(cmd, check=True, capture_output=True, text=True)
+        _run_checked(cmd)
 
     def _repo_root(self) -> Path:
         return Path(__file__).resolve().parents[3]