Add File hard link API and tests#120041
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adamsitnik merged 45 commits intodotnet:mainfrom Oct 22, 2025
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Introduce `File.CreateHardLink` and `FileSystemInfo.CreateAsHardLink` APIs to create hard links, with platform-specific implementations. Add comprehensive tests for hard link creation, behavior, and error cases for both File and FileInfo. Implements #69030
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@dotnet-policy-service agree |
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src/coreclr/nativeaot/System.Private.CoreLib/src/CompatibilitySuppressions.xml
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Pull Request Overview
This pull request adds hard link creation APIs to .NET, implementing File.CreateHardLink and FileSystemInfo.CreateAsHardLink methods with platform-specific implementations for Windows and Unix systems.
Key changes:
- Introduce public APIs for creating hard links in both File and FileSystemInfo classes
- Add platform-specific implementations using Windows Kernel32 and Unix system calls
- Implement comprehensive test coverage for hard link functionality
Reviewed Changes
Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.
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| File | Description |
|---|---|
| src/libraries/System.Runtime/ref/System.Runtime.cs | Add public API signatures for CreateHardLink methods |
| src/libraries/System.Private.CoreLib/src/System/IO/File.cs | Implement File.CreateHardLink static method |
| src/libraries/System.Private.CoreLib/src/System/IO/FileSystemInfo.cs | Implement CreateAsHardLink instance method |
| src/libraries/System.Private.CoreLib/src/System/IO/FileSystem.Windows.cs | Windows-specific hard link implementation using Kernel32 |
| src/libraries/System.Private.CoreLib/src/System/IO/FileSystem.Unix.cs | Unix-specific hard link implementation using link system call |
| src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems | Add Windows interop reference for CreateHardLink |
| src/libraries/Common/tests/System/IO/ReparsePointUtilities.cs | Add hard link test utilities and capability detection |
| src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/Base/HardLinks/BaseHardLinks.FileSystem.cs | Base test class with common hard link test scenarios |
| src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/File/HardLinks.cs | Tests for File.CreateHardLink API |
| src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/FileInfo/HardLinks.cs | Tests for FileInfo.CreateAsHardLink API |
| src/libraries/System.Runtime/tests/System.IO.FileSystem.Tests/System.IO.FileSystem.Tests.csproj | Add test files to project compilation |
src/libraries/System.Private.CoreLib/src/System/IO/FileSystemInfo.cs
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This was referenced Sep 24, 2025
No functional changes.
Calling `File.WriteAllText` (creates the file if it does not exist) right after `CreateFile` might be redundant
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Hi. May I ask the current review status of this PR? |
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@adamsitnik Thanks for your review! All review comments have been addressed. However this ConditionalClass comment requires your attention. |
adamsitnik
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Oct 20, 2025
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It looks very good, PTAL at my comments regarding test cleanup.
src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarEntry.Unix.cs
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...s/System.Runtime/tests/System.IO.FileSystem.Tests/Base/HardLinks/BaseHardLinks.FileSystem.cs
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...s/System.Runtime/tests/System.IO.FileSystem.Tests/Base/HardLinks/BaseHardLinks.FileSystem.cs
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...s/System.Runtime/tests/System.IO.FileSystem.Tests/Base/HardLinks/BaseHardLinks.FileSystem.cs
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jozkee
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Oct 20, 2025
...s/System.Runtime/tests/System.IO.FileSystem.Tests/Base/HardLinks/BaseHardLinks.FileSystem.cs
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Oct 21, 2025
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LGTM, big thanks for your contribution @SadPencil !
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Introduce
File.CreateHardLinkandFileSystemInfo.CreateAsHardLinkAPIs to create hard links, with platform-specific implementations. Add comprehensive tests for hard link creation, behavior, and error cases for both File and FileInfo.Implements and closes #69030