External to Hybrid examples

Author: jackal1-66

MC/config/examples/hybrid/example.json

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+{
+  "generators": [
+    {
+        "name": "pythia8",
+        "config": {
+        "config": "${O2_ROOT}/share/Generators/egconfig/pythia8_inel.cfg",
+        "hooksFileName": "",
+        "hooksFuncName": "",
+        "includePartonEvent": false,
+        "particleFilter": "",
+        "verbose": 0
+        }
+    },
+    {
+        "name": "evtpool",
+        "config": {
+        "eventPoolPath" : "alien:///alice/cern.ch/user/a/aliprod/LHC26c9/manifest1.dat",
+        "skipNonTrackable" : true,
+        "roundRobin" : false,
+        "randomize" : true,
+        "rngseed" : 0,
+        "randomphi" : false
+        }
+    }
+  ],
+  "fractions": [
+    1,
+    1
+  ]
+}

MC/config/examples/ini/GeneratorExtToHybrid.ini

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+[GeneratorHybrid]
+configFile = ${O2DPG_MC_CONFIG_ROOT}/MC/config/examples/hybrid/example.json
+switchExtToHybrid = true

MC/config/examples/ini/GeneratorExtToHybridAlien.ini

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+#---> GeneratorExtToHybrid
+[GeneratorHybrid]
+configFile = alien:///alice/cern.ch/user/p/pwg_pp/Hybrid/alienhybrid.json
+switchExtToHybrid = true

MC/config/examples/ini/tests/GeneratorExtToHybrid.C

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+int Hybrid()
+{
+  std::string path{"o2sim_Kine.root"};
+  // Check that file exists, can be opened and has the correct tree
+  TFile file(path.c_str(), "READ");
+  if (file.IsZombie())
+  {
+    std::cerr << "Cannot open ROOT file " << path << "\n";
+    return 1;
+  }
+  auto tree = (TTree *)file.Get("o2sim");
+  if (!tree)
+  {
+    std::cerr << "Cannot find tree o2sim in file " << path << "\n";
+    return 1;
+  }
+  std::vector<o2::MCTrack> *tracks{};
+  tree->SetBranchAddress("MCTrack", &tracks);
+
+  // Check if all events are filled
+  auto nEvents = tree->GetEntries();  
+  for (Long64_t i = 0; i < nEvents; ++i)
+  {
+    tree->GetEntry(i);
+    if (tracks->empty())
+    {
+      std::cerr << "Empty entry found at event " << i << "\n";
+      return 1;
+    }
+  }
+  // Check if there are 100 events, as simulated in the o2dpg-test
+  if (nEvents != 100)
+  {
+    std::cerr << "Expected 100 events, got " << nEvents << "\n";
+    return 1;
+  }
+  return 0;
+}