From e82785d6b5da237931288255481143f7b1430e51 Mon Sep 17 00:00:00 2001
From: Maksim Denisov <denisov.maksim@huawei.com>
Date: Mon, 17 Feb 2025 14:30:30 +0100
Subject: TmpDir: Create temporary files

... and keep parent directories alive while nested directories exist.
---
 src/utils/cpp/tmp_dir.cpp | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'src/utils/cpp/tmp_dir.cpp')

diff --git a/src/utils/cpp/tmp_dir.cpp b/src/utils/cpp/tmp_dir.cpp
index 88cc0f98..8d6e0724 100644
--- a/src/utils/cpp/tmp_dir.cpp
+++ b/src/utils/cpp/tmp_dir.cpp
@@ -21,7 +21,6 @@
 #endif
 
 #include <cstdlib>
-#include <string>
 #include <string_view>
 #include <tuple>
 
@@ -41,6 +40,28 @@ auto TmpDir::CreateNestedDirectory(TmpDir::Ptr const& parent) noexcept
     return CreateImpl(parent, parent->GetPath());
 }
 
+auto TmpDir::CreateFile(TmpDir::Ptr const& parent,
+                        std::string const& file_name) noexcept -> TmpFile::Ptr {
+    // Create a new tmp directory to guarantee uniqueness:
+    auto temp_dir = CreateNestedDirectory(parent);
+    if (temp_dir == nullptr) {
+        return nullptr;
+    }
+
+    try {
+        auto file_path = std::filesystem::weakly_canonical(
+            std::filesystem::absolute(temp_dir->GetPath() / file_name));
+        if (not FileSystemManager::CreateFile(file_path)) {
+            return nullptr;
+        }
+
+        return std::shared_ptr<TmpFile const>{
+            new TmpFile(std::move(temp_dir), std::move(file_path))};
+    } catch (...) {
+        return nullptr;
+    }
+}
+
 auto TmpDir::CreateImpl(TmpDir::Ptr parent,
                         std::filesystem::path const& path) noexcept -> Ptr {
     static constexpr std::string_view kDirTemplate = "tmp.XXXXXX";
-- 
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