Merge branch 'support-BSM-H7-21.6' into '21.6'

Herwig7_i support for showering LHE files generated from a UFO file containting BSM particle

See merge request !64892

Generators/Herwig7_i/share/common/Herwig7_UFO.py

+# Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
+
+# Python steering script for Herwig7_i to shower input LHE files
+# generated with a given UFO model
+#   written by Yoran Yeh <yoran.yeh@cern.ch>
+
+import os, shutil
+
+def generateFRModel(UFOModel, overWriteLocalDir=False):
+    """
+        UFOModel (string) :: name of UFO model that is imported for the event generation
+    """
+
+    # find UFO directory
+    MGModelsLatest = '/cvmfs/atlas.cern.ch/repo/sw/Generators/madgraph/models/latest/'
+    MGModelDirCVMFS = os.path.join(MGModelsLatest, UFOModel)
+    if not MGModelDirCVMFS:
+        athMsgLog.error('could not find UFO model ' + UFOModel + ' on cvmfs.' \
+                        ' Are you sure it is available on ' + MGModelsLatest + '?')
+        exit(1)
+
+    try:
+        shutil.copytree(MGModelDirCVMFS, UFOModel)
+    except OSError:
+        if not overWriteLocalDir:
+            athMsgLog.error(UFOModel + ' already exists in your local directory.' \
+                            ' Please (re)move this directory yourself to avoid it' \
+                            ' being overwritten, or set `overWriteLocalDir` to True.' \
+                            ' Exiting gracefully...')
+            exit(1)
+        else:
+            shutil.rmtree(UFOModel)
+            shutil.copytree(MGModelDirCVMFS, UFOModel)
+
+    # find ufo2herwig command
+    HERWIG7_PATH = os.environ['HERWIG7_PATH']
+    ufo2herwig   = os.path.join(HERWIG7_PATH, 'bin/ufo2herwig')
+    if not ufo2herwig: 
+        athMsgLog.error('could not find Herwig7 ufo2herwig command: ' + ufo2herwig)
+        exit(1)
+
+    # generate FRModel.model file
+    try:
+        os.system(ufo2herwig + ' ' + UFOModel)
+    
+    # it might be needed to convert python2 models to python3
+    except:
+    
+        # fresh copy of UFO model, as the previous attempt for `ufo2herwig` 
+        # will have made modifications in this directory
+        shutil.rmtree(UFOModel)
+        shutil.copytree(MGModelDirCVMFS, UFOModel)
+        os.system(ufo2herwig + ' --convert ' + UFOModel)
+
+    os.system('make')
+    
+    # add "read FRModel.model" to the Herwig7 command
+    Herwig7Config.add_commands("""
+read FRModel.model
+""")
+
+  
+