Merge pull request #8594 from leoetlino/fs-createfullpath-fix

IOS/FS: Fix CreateFullPath to not create directories that already exist

Source/Core/Core/IOS/FS/FileSystem.cpp

@@ -115,9 +115,12 @@ ResultCode FileSystem::CreateFullPath(Uid uid, Gid gid, const std::string& path,
     if (metadata && metadata->is_file)
       return ResultCode::Invalid;
 
-    const ResultCode result = CreateDirectory(uid, gid, subpath, attribute, modes);
-    if (result != ResultCode::Success && result != ResultCode::AlreadyExists)
-      return result;
+    if (!metadata)
+    {
+      const ResultCode result = CreateDirectory(uid, gid, subpath, attribute, modes);
+      if (result != ResultCode::Success)
+        return result;
+    }
 
     ++position;
   }

Source/UnitTests/Core/IOS/FS/FileSystemTest.cpp

@@ -434,3 +434,21 @@ TEST_F(FileSystemTest, ReadDirectoryOrdering)
   ASSERT_EQ(result->size(), file_names.size());
   EXPECT_TRUE(std::equal(result->begin(), result->end(), file_names.rbegin()));
 }
+
+TEST_F(FileSystemTest, CreateFullPath)
+{
+  ASSERT_EQ(m_fs->CreateFullPath(Uid{0}, Gid{0}, "/tmp/a/b/c/d", 0, modes), ResultCode::Success);
+
+  // Parent directories should be created by CreateFullPath.
+  for (const std::string& path : {"/tmp", "/tmp/a", "/tmp/a/b", "/tmp/a/b/c"})
+    EXPECT_TRUE(m_fs->ReadDirectory(Uid{0}, Gid{0}, path).Succeeded());
+
+  // If parent directories already exist, the call should still succeed.
+  EXPECT_EQ(m_fs->CreateFullPath(Uid{0}, Gid{0}, "/tmp/a/b/c/d", 0, modes), ResultCode::Success);
+
+  // If parent directories already exist and are owned by a different user,
+  // CreateFullPath should still succeed.
+  // See https://github.com/dolphin-emu/dolphin/pull/8593
+  EXPECT_EQ(m_fs->CreateFullPath(Uid{0x1000}, Gid{1}, "/shared2/wc24/mbox/Readme.txt", 0, modes),
+            ResultCode::Success);
+}