Add 'prepareResultOutputDirectory' function in Opm namespace that removes possible old simulation output files from the specified output directory.

This function is called during 'setupLogging' before the actual logging starts.

opm/simulators/utils/readDeck.cpp

@@ -76,6 +76,7 @@
 #include <filesystem>
 #include <functional>
 #include <memory>
+#include <regex>
 #include <sstream>
 #include <stdexcept>
 #include <unordered_map>
@@ -402,15 +403,28 @@ void Opm::ensureOutputDirExists(const std::string& cmdline_output_dir)
     }
 }
 
+void Opm::prepareResultOutputDirectory(const std::string&           baseName,
+                                       const std::filesystem::path& outputDir)  
+{   
+    //Loop over all files in the output directory and subdirectories and delete them if their name is baseName + a correct extension
+    std::regex r(baseName + R"(\.(F?(DBG|E?GRID|INIT|PRT|RFT|SMSPEC|UNSMRY|UNRST)|([ABCFGHSTUXYZ]\d{4})|(INFOSTEP|INFOITER|OPMRST)))");
+    for (auto& file : std::filesystem::recursive_directory_iterator(outputDir)) {
+        std::string fileName = file.path().filename();
+        if (std::regex_match(fileName, r)) {
+            std::filesystem::remove(file);
+        }
+    }
+}
+
 // Setup the OpmLog backends
 Opm::FileOutputMode
-Opm::setupLogging(const int          mpi_rank_,
-                  const std::string& deck_filename,
-                  const std::string& cmdline_output_dir,
-                  const std::string& cmdline_output,
-                  const bool         output_cout_,
-                  const std::string& stdout_log_id,
-                  const bool         allRanksDbgLog)
+Opm::setupLogging(Parallel::Communication& comm,
+                  const std::string&       deck_filename,
+                  const std::string&       cmdline_output_dir,
+                  const std::string&       cmdline_output,
+                  const bool               output_cout_,
+                  const std::string&       stdout_log_id,
+                  const bool               allRanksDbgLog)
 {
     if (!cmdline_output_dir.empty()) {
         ensureOutputDirExists(cmdline_output_dir);
@@ -439,15 +453,24 @@ Opm::setupLogging(const int          mpi_rank_,
             : std::filesystem::current_path().generic_string();
     }
 
+    // Cleans up the result output directory, we only do this on process 0
+    if (comm.rank() == 0) { 
+        prepareResultOutputDirectory(baseName, output_dir);
+    }
+    //... and the other processes need to wait for this to be finished.
+#if HAVE_MPI
+    MPI_Barrier(comm);
+#endif
+
     logFileStream << output_dir << "/" << baseName;
     debugFileStream << output_dir << "/" << baseName;
 
-    if (mpi_rank_ != 0) {
+    if (comm.rank() != 0) {
         // Added rank to log file for non-zero ranks.
         // This prevents message loss.
-        debugFileStream << "." << mpi_rank_;
+        debugFileStream << "." << comm.rank();
         // If the following file appears then there is a bug.
-        logFileStream << "." << mpi_rank_;
+        logFileStream << "." << comm.rank();
     }
     logFileStream << ".PRT";
     debugFileStream << ".DBG";
@@ -469,7 +492,7 @@ Opm::setupLogging(const int          mpi_rank_,
             std::cerr << "Value " << cmdline_output
                       << " is not a recognized output mode. Using \"all\" instead.\n";
         }
-        if (!allRanksDbgLog && mpi_rank_ != 0)
+        if (!allRanksDbgLog && comm.rank() != 0)
         {
             output = FileOutputMode::OUTPUT_NONE;
         }
@@ -488,7 +511,7 @@ Opm::setupLogging(const int          mpi_rank_,
         Opm::OpmLog::addBackend("DEBUGLOG", debugLog);
     }
 
-    if (mpi_rank_ == 0) {
+    if (comm.rank() == 0) {
         std::shared_ptr<Opm::StreamLog> streamLog = std::make_shared<Opm::StreamLog>(std::cout, Opm::Log::StdoutMessageTypes);
         Opm::OpmLog::addBackend(stdout_log_id, streamLog);
         // Set a tag limit of 10 (no category limit). Will later in

opm/simulators/utils/readDeck.hpp

@@ -24,6 +24,7 @@
 
 #include <opm/simulators/utils/ParallelCommunication.hpp>
 
+#include <filesystem>
 #include <memory>
 #include <optional>
 #include <string>
@@ -60,17 +61,21 @@ enum class FileOutputMode {
 void
 ensureOutputDirExists(const std::string& cmdline_output_dir);
 
+// Prepare the result ouptut directory by removing files from previous simulation runs.
+void
+prepareResultOutputDirectory(const std::string& baseName, const std::filesystem::path& outputDir);
+
 std::unique_ptr<ParseContext> setupParseContext(const bool exitOnAllErrors);
 
 // Setup the OpmLog backends
 FileOutputMode
-setupLogging(int                mpi_rank_,
-             const std::string& deck_filename,
-             const std::string& cmdline_output_dir,
-             const std::string& cmdline_output,
-             bool               output_cout_,
-             const std::string& stdout_log_id,
-             const bool         allRanksDbgLog);
+setupLogging(Parallel::Communication& comm,
+             const std::string&       deck_filename,
+             const std::string&       cmdline_output_dir,
+             const std::string&       cmdline_output,
+             bool                     output_cout_,
+             const std::string&       stdout_log_id,
+             const bool               allRanksDbgLog);
 
 /// \brief Reads the deck and creates all necessary objects if needed
 ///