From 2540f071ea80d02658ff0e12097b62bd1017b43e Mon Sep 17 00:00:00 2001
From: Alex Barney <thealexbarney@gmail.com>
Date: Mon, 13 Dec 2021 16:43:52 -0700
Subject: [PATCH] LocalFileSystem: Allow deleting read-only files and
 directories

---
 src/LibHac/Common/HResult.cs                  |  2 +
 .../FsSystem/Impl/TargetLockedAvoidance.cs    |  2 +-
 src/LibHac/FsSystem/LocalFileSystem.cs        | 81 ++++++++++++++++++-
 3 files changed, 82 insertions(+), 3 deletions(-)

diff --git a/src/LibHac/Common/HResult.cs b/src/LibHac/Common/HResult.cs
index 3f0c3439..48fc4404 100644
--- a/src/LibHac/Common/HResult.cs
+++ b/src/LibHac/Common/HResult.cs
@@ -19,6 +19,7 @@ internal static class HResult
     public const int ERROR_ALREADY_EXISTS = unchecked((int)0x800700B7);
     public const int ERROR_DIRECTORY = unchecked((int)0x8007010B);
     public const int ERROR_SPACES_NOT_ENOUGH_DRIVES = unchecked((int)0x80E7000B);
+    public const int COR_E_IO = unchecked((int)0x80131620);
 
     public static Result HResultToHorizonResult(int hResult) => hResult switch
     {
@@ -35,6 +36,7 @@ internal static class HResult
         ERROR_ALREADY_EXISTS => ResultFs.PathAlreadyExists.Value,
         ERROR_DIRECTORY => ResultFs.PathNotFound.Value,
         ERROR_SPACES_NOT_ENOUGH_DRIVES => ResultFs.UsableSpaceNotEnough.Value,
+        COR_E_IO => ResultFs.TargetLocked.Value,
         _ => ResultFs.UnexpectedInLocalFileSystemE.Value
     };
 }
diff --git a/src/LibHac/FsSystem/Impl/TargetLockedAvoidance.cs b/src/LibHac/FsSystem/Impl/TargetLockedAvoidance.cs
index 840f9b57..0ba4302d 100644
--- a/src/LibHac/FsSystem/Impl/TargetLockedAvoidance.cs
+++ b/src/LibHac/FsSystem/Impl/TargetLockedAvoidance.cs
@@ -7,7 +7,7 @@ namespace LibHac.FsSystem.Impl;
 
 internal static class TargetLockedAvoidance
 {
-    private const int RetryCount = 2;
+    private const int RetryCount = 25;
     private const int SleepTimeMs = 2;
 
     // Allow usage outside of a Horizon context by using standard .NET APIs
diff --git a/src/LibHac/FsSystem/LocalFileSystem.cs b/src/LibHac/FsSystem/LocalFileSystem.cs
index b1640801..39664ad2 100644
--- a/src/LibHac/FsSystem/LocalFileSystem.cs
+++ b/src/LibHac/FsSystem/LocalFileSystem.cs
@@ -653,7 +653,28 @@ private static Result DeleteDirectoryInternal(DirectoryInfo dir, bool recursive)
 
         try
         {
-            dir.Delete(recursive);
+            try
+            {
+                dir.Delete(recursive);
+            }
+            catch (Exception ex) when (ex.HResult is HResult.COR_E_IO or HResult.ERROR_ACCESS_DENIED)
+            {
+                if (recursive)
+                {
+                    Result rc = DeleteDirectoryRecursivelyWithReadOnly(dir);
+                    if (rc.IsFailure()) return rc.Miss();
+                }
+                else
+                {
+                    // Try to delete read-only directories by first removing the read-only flag
+                    if (dir.Attributes.HasFlag(FileAttributes.ReadOnly))
+                    {
+                        dir.Attributes &= ~FileAttributes.ReadOnly;
+                    }
+
+                    dir.Delete(false);
+                }
+            }
         }
         catch (Exception ex) when (ex.HResult < 0)
         {
@@ -670,7 +691,20 @@ private static Result DeleteFileInternal(FileInfo file)
 
         try
         {
-            file.Delete();
+            try
+            {
+                file.Delete();
+            }
+            catch (UnauthorizedAccessException ex) when (ex.HResult == HResult.ERROR_ACCESS_DENIED)
+            {
+                // Try to delete read-only files by first removing the read-only flag.
+                if (file.Attributes.HasFlag(FileAttributes.ReadOnly))
+                {
+                    file.Attributes &= ~FileAttributes.ReadOnly;
+                }
+
+                file.Delete();
+            }
         }
         catch (Exception ex) when (ex.HResult < 0)
         {
@@ -680,6 +714,49 @@ private static Result DeleteFileInternal(FileInfo file)
         return EnsureDeleted(file);
     }
 
+    private static Result DeleteDirectoryRecursivelyWithReadOnly(DirectoryInfo rootDir)
+    {
+        try
+        {
+            foreach (FileSystemInfo info in rootDir.EnumerateFileSystemInfos())
+            {
+                if (info is FileInfo file)
+                {
+                    // Check each file for the read-only flag before deleting.
+                    if (file.Attributes.HasFlag(FileAttributes.ReadOnly))
+                    {
+                        file.Attributes &= ~FileAttributes.ReadOnly;
+                    }
+
+                    file.Delete();
+                }
+                else if (info is DirectoryInfo dir)
+                {
+                    Result rc = DeleteDirectoryRecursivelyWithReadOnly(dir);
+                    if (rc.IsFailure()) return rc.Miss();
+                }
+                else
+                {
+                    return ResultFs.UnexpectedInLocalFileSystemF.Log();
+                }
+            }
+
+            // The directory should be empty now. Remove any read-only flag and delete it.
+            if (rootDir.Attributes.HasFlag(FileAttributes.ReadOnly))
+            {
+                rootDir.Attributes &= ~FileAttributes.ReadOnly;
+            }
+
+            rootDir.Delete(true);
+        }
+        catch (Exception ex) when (ex.HResult < 0)
+        {
+            return HResult.HResultToHorizonResult(ex.HResult).Log();
+        }
+
+        return Result.Success;
+    }
+
     private static Result CreateDirInternal(DirectoryInfo dir, NxFileAttributes attributes)
     {
         try