Create output directories (#170)

k4FWCore/components/PodioOutput.cpp

@@ -17,6 +17,10 @@
  * limitations under the License.
  */
 #include <cstdlib>
+#include <filesystem>
+#include <system_error>
+
+#include "GaudiKernel/MsgStream.h"
 
 #include "PodioOutput.h"
 #include "k4FWCore/PodioDataSvc.h"
@@ -38,6 +42,20 @@ StatusCode PodioOutput::initialize() {
     return StatusCode::FAILURE;
   }
 
+  // check whether output directory needs to be created and eventually create it
+  auto outDirPath = std::filesystem::path(m_filename.value()).parent_path();
+  if (!outDirPath.empty() && !std::filesystem::is_directory(outDirPath)) {
+    std::error_code ec;
+    std::filesystem::create_directories(outDirPath, ec);
+    if (ec.value() != 0) {
+      error() << "Output directory \"" << outDirPath << "\" was not created!" << endmsg;
+      error() << "Error " << ec.value() << ": " << ec.message() << endmsg;
+
+      return StatusCode::FAILURE;
+    }
+    debug() << "Created output directory: " << outDirPath << endmsg;
+  }
+
   m_framewriter = std::make_unique<podio::ROOTWriter>(m_filename);
   m_switch      = KeepDropSwitch(m_outputCommands);
 

test/k4FWCoreTest/CMakeLists.txt

@@ -58,6 +58,7 @@ function(add_test_with_env testname)
 endfunction()
 
 add_test_with_env(CreateExampleEventData options/createExampleEventData.py)
+add_test_with_env(CreateExampleEventDataInDirectory options/createExampleEventDataInDirectory.py)
 
 add_test_with_env(CheckExampleEventData options/checkExampleEventData.py PROPERTIES DEPENDS CreateExampleEventData)
 add_test_with_env(CheckExampleEventData_noCollections options/checkExampleEventData.py --collections= PROPERTIES DEPENDS CreateExampleEventData)

test/k4FWCoreTest/options/createExampleEventDataInDirectory.py

@@ -0,0 +1,41 @@
+#
+# Copyright (c) 2014-2024 Key4hep-Project.
+#
+# This file is part of Key4hep.
+# See https://key4hep.github.io/key4hep-doc/ for further info.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from Gaudi.Configuration import INFO
+from Configurables import ApplicationMgr
+from Configurables import k4FWCoreTest_CreateExampleEventData
+from Configurables import k4DataSvc
+from Configurables import PodioOutput
+
+podioevent = k4DataSvc("EventDataSvc")
+
+producer = k4FWCoreTest_CreateExampleEventData()
+
+out = PodioOutput("out")
+out.filename = "output/dir/output_k4test_exampledata.root"
+out.outputCommands = ["keep *"]
+
+
+ApplicationMgr(
+    TopAlg=[producer, out],
+    EvtSel="NONE",
+    EvtMax=100,
+    ExtSvc=[podioevent],
+    OutputLevel=INFO,
+    StopOnSignal=True,
+)