Clean up platform checks in update service

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -26,7 +26,7 @@
     <PackageReference Include="Material.Avalonia" Version="3.6.0" />
     <PackageReference Include="Material.Icons.Avalonia" Version="2.1.9" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
-    <PackageReference Include="Onova" Version="2.6.11" />
+    <PackageReference Include="Onova" Version="2.6.12" />
   </ItemGroup>
 
   <ItemGroup>

DiscordChatExporter.Gui/Services/UpdateService.cs

@@ -9,18 +9,20 @@ namespace DiscordChatExporter.Gui.Services;
 
 public class UpdateService(SettingsService settingsService) : IDisposable
 {
-    private readonly IUpdateManager _updateManager = new UpdateManager(
-        new GithubPackageResolver(
-            "Tyrrrz",
-            "DiscordChatExporter",
-            // Examples:
-            // DiscordChatExporter.win-arm64.zip
-            // DiscordChatExporter.win-x64.zip
-            // DiscordChatExporter.linux-x64.zip
-            $"DiscordChatExporter.{RuntimeInformation.RuntimeIdentifier}.zip"
-        ),
-        new ZipPackageExtractor()
-    );
+    private readonly IUpdateManager? _updateManager = OperatingSystem.IsWindows()
+        ? new UpdateManager(
+            new GithubPackageResolver(
+                "Tyrrrz",
+                "DiscordChatExporter",
+                // Examples:
+                // DiscordChatExporter.win-arm64.zip
+                // DiscordChatExporter.win-x64.zip
+                // DiscordChatExporter.linux-x64.zip
+                $"DiscordChatExporter.{RuntimeInformation.RuntimeIdentifier}.zip"
+            ),
+            new ZipPackageExtractor()
+        )
+        : null;
 
     private Version? _updateVersion;
     private bool _updatePrepared;
@@ -28,6 +30,9 @@ public class UpdateService(SettingsService settingsService) : IDisposable
 
     public async ValueTask<Version?> CheckForUpdatesAsync()
     {
+        if (_updateManager is null)
+            return null;
+
         if (!settingsService.IsAutoUpdateEnabled)
             return null;
 
@@ -37,6 +42,9 @@ public class UpdateService(SettingsService settingsService) : IDisposable
 
     public async ValueTask PrepareUpdateAsync(Version version)
     {
+        if (_updateManager is null)
+            return;
+
         if (!settingsService.IsAutoUpdateEnabled)
             return;
 
@@ -57,11 +65,10 @@ public class UpdateService(SettingsService settingsService) : IDisposable
 
     public void FinalizeUpdate(bool needRestart)
     {
-        if (!settingsService.IsAutoUpdateEnabled)
+        if (_updateManager is null)
             return;
 
-        // Onova only works on Windows currently
-        if (!OperatingSystem.IsWindows())
+        if (!settingsService.IsAutoUpdateEnabled)
             return;
 
         if (_updateVersion is null || !_updatePrepared || _updaterLaunched)
@@ -82,5 +89,5 @@ public class UpdateService(SettingsService settingsService) : IDisposable
         }
     }
 
-    public void Dispose() => _updateManager.Dispose();
+    public void Dispose() => _updateManager?.Dispose();
 }