Add check on downloaded file

Author: njacazio

ALICE3/Core/DelphesO2TrackSmearer.cxx

@@ -64,7 +64,7 @@ bool TrackSmearer::loadTable(int pdg, const char* filename, bool forceReload)
     return false;
   }
 
-  filename = o2::fastsim::GeometryEntry::accessFile(filename, "./ALICE3/LUTs/", mCcdbManager, 600).c_str();
+  filename = o2::fastsim::GeometryEntry::accessFile(filename, "./.ALICE3/LUTs/", mCcdbManager).c_str();
   mLUTHeader[ipdg] = new lutHeader_t;
 
   std::ifstream lutFile(filename, std::ifstream::binary);

ALICE3/Core/GeometryContainer.cxx

@@ -218,9 +218,24 @@ std::string GeometryEntry::accessFile(const std::string& path, const std::string
     // File does not exist, retrieve from CCDB
     LOG(info) << " --- CCDB source detected for detector geometry " << path;
     std::map<std::string, std::string> metadata;
-    ccdb->getCCDBAccessor().retrieveBlob(ccdbPath, localPath, metadata, 1);
+    ccdb->getCCDBAccessor().retrieveBlob(ccdbPath, downloadPath, metadata, 1);
     LOG(info) << " --- Retrieved geometry configuration from CCDB to: " << localPath;
 
+    // Verify the integrity of the downloaded file
+    if (stat(localPath.c_str(), &buffer) != 0) {
+      flock(lockFd, LOCK_UN);
+      close(lockFd);
+      LOG(fatal) << " --- Downloaded file does not exist or is not accessible: " << localPath;
+      return "";
+    }
+    if (buffer.st_size == 0) {
+      flock(lockFd, LOCK_UN);
+      close(lockFd);
+      LOG(fatal) << " --- Downloaded file is empty: " << localPath;
+      return "";
+    }
+    LOG(info) << " --- File integrity verified. Size: " << buffer.st_size << " bytes";
+
     // Create done marker file to indicate successful download
     std::ofstream doneMarker(doneFile);
     doneMarker.close();