From 8dae128d07a4d0e78a9c3573456adabf285eeab9 Mon Sep 17 00:00:00 2001
From: Michael Zanetti <michael_zanetti@gmx.net>
Date: Tue, 18 Jun 2019 16:55:54 +0200
Subject: [PATCH] Fix app logging not working when the cache dir does not
 exist.

This may happen on the very first startup on a pristine system.
---
 nymea-app/applogcontroller.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/nymea-app/applogcontroller.cpp b/nymea-app/applogcontroller.cpp
index 223d59fb..5d7ceb64 100644
--- a/nymea-app/applogcontroller.cpp
+++ b/nymea-app/applogcontroller.cpp
@@ -5,6 +5,7 @@
 #include <QSettings>
 #include <QClipboard>
 #include <QGuiApplication>
+#include <QDir>
 
 QtMessageHandler AppLogController::s_oldLogMessageHandler = nullptr;
 
@@ -28,7 +29,8 @@ AppLogController *AppLogController::instance()
 AppLogController::AppLogController(QObject *parent) : QAbstractListModel(parent)
 {
 
-    QString fileName = QStandardPaths::writableLocation(QStandardPaths::CacheLocation) + "/nymea-app.log";
+    QString path = QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
+    QString fileName = path + "/nymea-app.log";
     m_logFile.setFileName(fileName);
 
     if (QFile::exists(fileName)) {
@@ -37,11 +39,19 @@ AppLogController::AppLogController(QObject *parent) : QAbstractListModel(parent)
         }
         QFile::rename(fileName, fileName + ".old");
     }
+    QDir dir(path);
+    if (!dir.exists()) {
+        if (!dir.mkpath(path)) {
+            qWarning() << "Cannot create cache location. Logging will not work.";
+            return;
+        }
+    }
 
     if (!m_logFile.open(QFile::ReadWrite | QFile::Truncate)) {
-        qDebug() << "Cannot open logfile for writing";
+        qWarning() << "Cannot open logfile for writing.";
         return;
     }
+    qDebug() << "App log opened at" << fileName;
 
     if (enabled()) {
         activate();