Handle write exception for log handler (#2135)

Bloxstrap/App.xaml.cs

@@ -182,7 +182,7 @@ namespace Bloxstrap
             {
                 Logger.Initialize(LaunchSettings.IsUninstall);
 
-                if (!Logger.Initialized)
+                if (!Logger.Initialized && !Logger.NoWriteMode)
                 {
                     Logger.WriteLine(LOG_IDENT, "Possible duplicate launch detected, terminating.");
                     Terminate();

Bloxstrap/Logger.cs

@@ -9,6 +9,7 @@
 
         public readonly List<string> Backlog = new();
         public bool Initialized = false;
+        public bool NoWriteMode = false;
         public string? FileLocation;
 
         public void Initialize(bool useTempDir = false)
@@ -45,6 +46,23 @@
                 WriteLine(LOG_IDENT, "Failed to initialize because log file already exists");
                 return;
             }
+            catch (UnauthorizedAccessException)
+            {
+                if (NoWriteMode)
+                    return;
+
+                WriteLine(LOG_IDENT, $"Failed to initialize because Bloxstrap cannot write to {directory}");
+
+                Frontend.ShowMessageBox(
+                    String.Format(Resources.Strings.Logger_NoWriteMode, directory), 
+                    System.Windows.MessageBoxImage.Warning, 
+                    System.Windows.MessageBoxButton.OK
+                );
+
+                NoWriteMode = true;
+
+                return;
+            }
             
 
             Initialized = true;

Bloxstrap/Resources/Strings.Designer.cs

@@ -1317,6 +1317,15 @@ namespace Bloxstrap.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to No log file will be written for this launch because Bloxstrap is unable to write to the folder at &apos;{0}&apos;.
+        /// </summary>
+        public static string Logger_NoWriteMode {
+            get {
+                return ResourceManager.GetString("Logger.NoWriteMode", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Contributors.
         /// </summary>

Bloxstrap/Resources/Strings.resx

@@ -1079,4 +1079,7 @@ Selecting 'No' will ignore this warning and continue installation.</value>
   <data name="Menu.FastFlagEditor.InvalidNumberValue" xml:space="preserve">
     <value>The entry for '{0}' is not valid as the value must be a number</value>
   </data>
+  <data name="Logger.NoWriteMode" xml:space="preserve">
+    <value>No log file will be written for this launch because Bloxstrap is unable to write to the folder at '{0}'</value>
+  </data>
 </root>