Add per-session timestamped log files in launch directory, keep last 5

Each launch creates a new mo_interface_YYYY-MM-DD_HH-MM-SS.log in a
logs/ folder next to where fluorine-manager was run from. Old logs are
cleaned up to keep only the 5 most recent. Launcher scripts export
FLUORINE_LAUNCH_DIR before cd'ing to the bin directory so the C++ side
knows the original working directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2 files changed, 31 insertions, 5 deletions

diff --git a/docker/build-inner.sh b/docker/build-inner.sh
index 2d32e31..98b8932 100755
--- a/docker/build-inner.sh
+++ b/docker/build-inner.sh
@@ -432,6 +432,7 @@ unset PYTHONPATH PYTHONNOUSERSITE PYTHONHOME MO2_PYTHON_DIR
 export QT_PLUGIN_PATH="${RUN}/qt6plugins"
 export QT_QPA_PLATFORM_PLUGIN_PATH="${RUN}/qt6plugins/platforms"
 
+export FLUORINE_LAUNCH_DIR="${PWD}"
 cd "${RUN}"
 exec "${RUN}/ModOrganizer-core" "$@"
 LAUNCH
@@ -662,6 +663,7 @@ export QT_ICON_THEME_NAME="${QT_ICON_THEME_NAME:-breeze}"
 export QT_STYLE_OVERRIDE="${QT_STYLE_OVERRIDE:-Breeze}"
 export XDG_CURRENT_DESKTOP="${XDG_CURRENT_DESKTOP:-KDE}"
 
+export FLUORINE_LAUNCH_DIR="${PWD}"
 cd "${APPIMAGE_DIR}"
 exec "${BIN}/ModOrganizer-core" "$@"
 APPRUN
diff --git a/src/src/loglist.cpp b/src/src/loglist.cpp
index 8ed28f1..b7ccda2 100644
--- a/src/src/loglist.cpp
+++ b/src/src/loglist.cpp
@@ -22,6 +22,7 @@ along with Mod Organizer.  If not, see <http://www.gnu.org/licenses/>.
 #include "env.h"

 #include "fluorinepaths.h"

 #include "organizercore.h"

+#include <algorithm>

 #include <cstdlib>

 

 using namespace MOBase;

@@ -241,7 +242,10 @@ void LogList::clear()
 void LogList::openLogsFolder()

 {

 #ifndef _WIN32

-  const QString logsPath = fluorineDataDir() + "/logs";

+  const char* launchDir  = std::getenv("FLUORINE_LAUNCH_DIR");

+  const QString logsPath = (launchDir && launchDir[0])

+                               ? QString::fromUtf8(launchDir) + "/logs"

+                               : QDir::currentPath() + "/logs";

 #else

   const QString logsPath = qApp->property("dataPath").toString() + "/" +

                            QString::fromStdWString(AppConfig::logPath());

@@ -406,11 +410,31 @@ bool createAndMakeWritable(const std::wstring& subPath)
 bool setLogDirectory(const QString& dir)

 {

 #ifndef _WIN32

-  // On Linux, all logs go to ~/.var/app/com.fluorine.manager/logs/

-  const QString logDir = fluorineDataDir() + "/logs";

+  // Place logs in the directory the user launched fluorine from so they're

+  // easy to find and share.  Each launch creates a new timestamped log file

+  // and the oldest are cleaned up to keep only the last 5.

+  // FLUORINE_LAUNCH_DIR is set by the launcher script before it cd's elsewhere.

+  const char* launchDir = std::getenv("FLUORINE_LAUNCH_DIR");

+  const QString logDir  = (launchDir && launchDir[0])

+                              ? QString::fromUtf8(launchDir) + "/logs"

+                              : QDir::currentPath() + "/logs";

   QDir().mkpath(logDir);

-  const auto logFile = logDir + "/" +

-                       QString::fromStdWString(AppConfig::logFileName());

+

+  // Create a timestamped log file for this session.

+  const QString timestamp =

+      QDateTime::currentDateTime().toString("yyyy-MM-dd_HH-mm-ss");

+  const auto logFile = logDir + "/mo_interface_" + timestamp + ".log";

+

+  // Clean up old logs, keeping only the most recent (numLogFiles - 1) so that

+  // together with the new one we have numLogFiles total.

+  {

+    QDir d(logDir);

+    QStringList existing = d.entryList({"mo_interface_*.log"}, QDir::Files, QDir::Name);

+    const int keep = std::max(0, AppConfig::numLogFiles() - 1);

+    while (existing.size() > keep) {

+      d.remove(existing.takeFirst());

+    }

+  }

 #else

   const auto logFile = dir + "/" + QString::fromStdWString(AppConfig::logPath()) + "/" +

                        QString::fromStdWString(AppConfig::logFileName());