From 0cf00acef7e7ec0474c7689410f512e4d9ff298e Mon Sep 17 00:00:00 2001
From: Thomas Madlener <thomas.madlener@desy.de>
Date: Fri, 22 Sep 2023 11:10:34 +0200
Subject: [PATCH] Fix python imports when built without SIO support (#490)

* Do not unconditionally try to import the sio bindings

* Make regex a bit less error prone

* Avoid noisy but harmless ROOT message during podio builds
---
 python/CMakeLists.txt      |  2 +-
 python/podio/__init__.py   | 10 +++++++++-
 python/podio/test_utils.py |  3 ++-
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index a17b07748..5952f8959 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -19,7 +19,7 @@ else()
     DESTINATION ${podio_PYTHON_INSTALLDIR}
     REGEX test_.*\\.py$ EXCLUDE  # Do not install test files
     PATTERN __pycache__ EXCLUDE  # Or pythons caches
-    REGEX .*sio.*\\.py$ EXCLUDE  # All things sio related
+    REGEX .*sio_.*\\.py$ EXCLUDE  # All things sio related
     )
 endif()
 
diff --git a/python/podio/__init__.py b/python/podio/__init__.py
index 483885729..1414f58be 100644
--- a/python/podio/__init__.py
+++ b/python/podio/__init__.py
@@ -22,7 +22,15 @@
 
 if _DYNAMIC_LIBS_LOADED:
   from .frame import Frame
-  from . import root_io, sio_io, reading
+  from . import root_io, reading
+
+  try:
+    # We try to import the sio bindings which may fail if ROOT is not able to
+    # load the dictionary in this case they have most likely not been built and
+    # we just move on
+    from . import sio_io
+  except ImportError:
+    pass
 
   from . import EventStore
 
diff --git a/python/podio/test_utils.py b/python/podio/test_utils.py
index 3fed5959a..2c07d086b 100644
--- a/python/podio/test_utils.py
+++ b/python/podio/test_utils.py
@@ -4,7 +4,8 @@
 import os
 import ROOT
 
-ROOT.gSystem.Load("libTestDataModelDict.so")  # noqa: E402
+if ROOT.gSystem.DynamicPathName("libTestDataModelDict.so", True):  # noqa: E402
+  ROOT.gSystem.Load("libTestDataModelDict.so")  # noqa: E402
 from ROOT import ExampleHitCollection, ExampleClusterCollection  # noqa: E402 # pylint: disable=wrong-import-position
 
 from podio import Frame  # pylint: disable=wrong-import-position