From d2c347f1fa6abb1339d6bffc93dbd6c75ce9c657 Mon Sep 17 00:00:00 2001
From: Giulio Eulisse <10544+ktf@users.noreply.github.com>
Date: Fri, 8 Nov 2024 09:57:25 +0100
Subject: [PATCH] DPL Analysis: fix missing connection to the grid

It's not a given that parent files and the original data are
on the same support, so we need to connect to the grid if needed.
---
 Framework/AnalysisSupport/src/Plugin.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Framework/AnalysisSupport/src/Plugin.cxx b/Framework/AnalysisSupport/src/Plugin.cxx
index b899a52206422..e2a9a98ab90d3 100644
--- a/Framework/AnalysisSupport/src/Plugin.cxx
+++ b/Framework/AnalysisSupport/src/Plugin.cxx
@@ -175,6 +175,10 @@ struct DiscoverMetadataInAOD : o2::framework::ConfigDiscoveryPlugin {
             }
           }
 
+          if (parentFilename.starts_with("alien://")) {
+            TGrid::Connect("alien://");
+          }
+
           std::unique_ptr<TFile> parentFile{TFile::Open(parentFilename.c_str())};
           if (parentFile.get() == nullptr) {
             LOGP(fatal, "Couldn't open derived file \"{}\"!", parentFilename);