[libcalamaresui] Provide the logFile path

This is intended for consumption by QML; the ViewManager object
acts as a proxy for a handful of global Settings values already,
so throw in global Logger values as well. A QML module that would
like to read the log file (e.g. for tailing it as part of a
slide-show) can get the path via this property.

src/libcalamaresui/ViewManager.cpp

@@ -613,4 +613,10 @@ ViewManager::isSetupMode() const
     return s ? s->isSetupMode() : false;
 }
 
+QString
+ViewManager::logFilePath() const
+{
+    return Logger::logFile();
+}
+
 }  // namespace Calamares

src/libcalamaresui/ViewManager.h

@@ -54,6 +54,7 @@ class UIDLLEXPORT ViewManager : public QAbstractListModel
     Q_PROPERTY( bool isDebugMode READ isDebugMode CONSTANT FINAL )
     Q_PROPERTY( bool isChrootMode READ isChrootMode CONSTANT FINAL )
     Q_PROPERTY( bool isSetupMode READ isSetupMode CONSTANT FINAL )
+    Q_PROPERTY( QString logFilePath READ logFilePath CONSTANT FINAL )
 
 public:
     /**
@@ -208,6 +209,8 @@ public Q_SLOTS:
     bool isChrootMode() const;
     /// @brief Proxy to Settings::isSetupMode() default @c false
     bool isSetupMode() const;
+    /// @brief Proxy to Logger::logFile(), default empty
+    QString logFilePath() const;
 
 signals:
     void currentStepChanged();