Create permanent backup before migrating collections.

Penumbra/Configuration.cs

@@ -136,7 +136,7 @@ public class Configuration : IPluginConfiguration, ISavable
     /// <summary> Contains some default values or boundaries for config values. </summary>
     public static class Constants
     {
-        public const int   CurrentVersion      = 8;
+        public const int   CurrentVersion      = 9;
         public const float MaxAbsoluteSize     = 600;
         public const int   DefaultAbsoluteSize = 250;
         public const float MinAbsoluteSize     = 50;

Penumbra/Services/BackupService.cs

@@ -7,6 +7,10 @@ namespace Penumbra.Services;
 
 public class BackupService : IAsyncService
 {
+    private readonly Logger                  _logger;
+    private readonly DirectoryInfo           _configDirectory;
+    private readonly IReadOnlyList<FileInfo> _fileNames;
+
     /// <inheritdoc/>
     public Task Awaiter { get; }
 
@@ -17,10 +21,16 @@ public class BackupService : IAsyncService
     /// <summary> Start a backup process on the collected files. </summary>
     public BackupService(Logger logger, FilenameService fileNames)
     {
-        var files = PenumbraFiles(fileNames);
+        _logger          = logger;
-        Awaiter = Task.Run(() => Backup.CreateAutomaticBackup(logger, new DirectoryInfo(fileNames.ConfigDirectory), files));
+        _fileNames       = PenumbraFiles(fileNames);
+        _configDirectory = new DirectoryInfo(fileNames.ConfigDirectory);
+        Awaiter          = Task.Run(() => Backup.CreateAutomaticBackup(logger, new DirectoryInfo(fileNames.ConfigDirectory), _fileNames));
     }
 
+    /// <summary> Create a permanent backup with a given name for migrations. </summary>
+    public void CreateMigrationBackup(string name)
+        => Backup.CreatePermanentBackup(_logger, _configDirectory, _fileNames, name);
+
     /// <summary> Collect all relevant files for penumbra configuration. </summary>
     private static IReadOnlyList<FileInfo> PenumbraFiles(FilenameService fileNames)
     {

Penumbra/Services/ConfigMigrationService.cs

@@ -22,7 +22,7 @@ namespace Penumbra.Services;
 /// Contains everything to migrate from older versions of the config to the current,
 /// including deprecated fields.
 /// </summary>
-public class ConfigMigrationService(SaveService saveService) : IService
+public class ConfigMigrationService(SaveService saveService, BackupService backupService) : IService
 {
     private Configuration _config = null!;
     private JObject       _data   = null!;
@@ -73,9 +73,23 @@ public class ConfigMigrationService(SaveService saveService) : IService
         Version5To6();
         Version6To7();
         Version7To8();
+        Version8To9();
         AddColors(config, true);
     }
 
+    // Migrate to ephemeral config.
+    private void Version8To9()
+    {
+        if (_config.Version != 8)
+            return;
+
+        backupService.CreateMigrationBackup("pre_collection_identifiers");
+        _config.Version           = 9;
+        _config.Ephemeral.Version = 9;
+        _config.Save();
+        _config.Ephemeral.Save();
+    }
+
     // Migrate to ephemeral config.
     private void Version7To8()
     {