chore: import upstream snapshot with attribution

Sources/ContainerizationArchive/TempDir.swift

@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import ContainerizationExtras
+import Foundation
+
+internal func createTemporaryDirectory(baseName: String) -> URL? {
+    let url = FileManager.default.uniqueTemporaryDirectory().appendingPathComponent(
+        "\(baseName).XXXXXX")
+
+    var path = url.absoluteURL.path
+    return path.withUTF8 { utf8Bytes in
+        var mutablePath = Array(utf8Bytes) + [0]
+        return mutablePath.withUnsafeMutableBufferPointer { buffer -> URL? in
+            guard let baseAddress = buffer.baseAddress else { return nil }
+            mkdtemp(baseAddress)
+            let resultPath = String(decoding: buffer[..<(buffer.count - 1)], as: UTF8.self)
+            return URL(fileURLWithPath: resultPath, isDirectory: true)
+        }
+    }
+}