1 files changed, 41 insertions, 0 deletions
diff --git a/src/Agent.Windows/Recovery/TransactionalFileEditor.cs b/src/Agent.Windows/Recovery/TransactionalFileEditor.cs
index 805a069..25c949d 100644
--- a/src/Agent.Windows/Recovery/TransactionalFileEditor.cs
+++ b/src/Agent.Windows/Recovery/TransactionalFileEditor.cs
@@ -93,6 +93,26 @@ public sealed class TransactionalFileEditor(TaskResourceJournal journal, string
         return new(journal, entryId, canonical);
     }
 
+    public FileRenameTransaction Rename(string sourcePath, string destinationPath)
+    {
+        string source = CanonicalPath.Resolve(sourcePath);
+        string destination = CanonicalPath.Resolve(destinationPath, requireExisting: false);
+        if (!File.Exists(source)) throw new FileNotFoundException($"Source file does not exist: '{source}'.");
+        if (File.Exists(destination)) throw new ToolValidationException($"Destination already exists: '{destination}'. Rename overwrite is not allowed.");
+        if (!source.StartsWith(System.IO.Path.GetPathRoot(source)!, StringComparison.OrdinalIgnoreCase) ||
+            !destination.StartsWith(System.IO.Path.GetPathRoot(source)!, StringComparison.OrdinalIgnoreCase))
+            throw new ToolValidationException("Cross-volume rename is not supported.");
+        byte[] content = File.ReadAllBytes(source);
+        string sourceHash = Convert.ToHexString(SHA256.HashData(content));
+        Guid entryId = journal.Prepare("file.rename", source, new Dictionary<string, string>
+        {
+            ["destination_path"] = destination, ["source_sha256"] = sourceHash
+        });
+        File.Move(source, destination);
+        journal.MarkApplied(entryId);
+        return new(journal, entryId, source, destination, sourceHash);
+    }
+
     private static string NormalizeHash(string hash) => hash.Replace("-", string.Empty, StringComparison.Ordinal).Trim().ToUpperInvariant();
 }
 
@@ -144,6 +164,27 @@ public sealed class DirectoryRmdirTransaction(TaskResourceJournal journal, Guid
     }
 }
 
+public sealed class FileRenameTransaction(TaskResourceJournal journal, Guid entryId, string sourcePath, string destinationPath, string sourceHash)
+{
+    private bool _finished;
+    public void Commit() { if (_finished) return; journal.MarkCleaned(entryId); _finished = true; }
+    public void Rollback()
+    {
+        if (_finished) return;
+        if (!File.Exists(destinationPath)) throw new InvalidOperationException("Rollback refused because the destination file is missing.");
+        if (!Hash(destinationPath).Equals(sourceHash, StringComparison.Ordinal))
+            throw new InvalidDataException("Rollback refused because the destination file hash does not match the original source hash.");
+        File.Move(destinationPath, sourcePath);
+        journal.MarkCleaned(entryId);
+        _finished = true;
+    }
+    private static string Hash(string target)
+    {
+        using FileStream stream = File.OpenRead(target);
+        return Convert.ToHexString(SHA256.HashData(stream));
+    }
+}
+
 public sealed class FileEditTransaction(
     TaskResourceJournal journal, Guid entryId, string path, string originalHash, string replacementHash,
     string backupPath, string originalBase64, bool originallyExisted)