feat: merge tonistiigi upstream (586307ad452fadb42e28be16d2b995b2eb6755e9)

[janishorsts]

Upgrading to the latest changes from the upstream https://github.com/tonistiigi/fsutil.

Disabled the codecov/codecov-action – not relevant to us. Unless somebody sees the value.

[gemini-code-assist]

Summary of Changes

Hello @janishorsts, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly updates the repository by merging upstream changes, focusing on modernizing the build and CI/CD infrastructure, enhancing file system utility features, and improving cross-platform compatibility. It introduces new capabilities for file copying and transfer, along with refinements to internal data handling and static analysis configurations.

Highlights

• Build & CI/CD Enhancements: Updated Go version from 1.20 to 1.23 and tonistiigi/xx version from 1.1.0 to 1.6.1 in the Dockerfile. Added .github/CODEOWNERS for PR approval requirements and .github/dependabot.yml for GitHub Actions dependency updates. The .gitignore was simplified, and .golangci.yml had its timeout increased and a depguard rule added to deny io/ioutil usage. docker-bake.hcl was significantly refactored to support cross-platform builds, linting, and generated file validation.
• File Copying Features: Introduced new options in copy/copy.go such as ModeStr for non-octal permission string application, and AlwaysReplaceExistingDestPaths to force overwriting existing destination paths regardless of type. The MkdirAll function now returns a list of created directories, and copyFileInfo logic was updated for Linux and Unix systems to correctly apply special permission bits (setuid, setgid, sticky) using dchapes-mode.
• Core File Utility Improvements: A new buffer.go and buffer_test.go were added for efficient byte buffer management. diff_containerd.go was updated to use stat.Clone() for safer stat object manipulation and filepath.Separator for platform-agnostic path handling. A WithHardlinkReset function was introduced in hardlinks.go to correctly handle hardlinks in filtered file systems.
• Cross-Platform Compatibility: New copy_otherbsd.go and copy_windows_test.go files were added to extend platform support. Path normalization was implemented in receive.go and send.go to convert Unix-style paths to platform-specific paths and vice-versa during transfers, improving cross-OS compatibility. Darwin-specific xattr filtering was added in stat_unix.go to skip com.apple. attributes.
• File Transfer Protocol & Metadata: The receive.go protocol implementation was enhanced with a MetadataOnly option in ReceiveOpt, allowing clients to request only file metadata without content. This feature buffers stat information and writes it to a .fsutil-metadata file upon completion of the transfer.

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[gemini-code-assist]

Code Review

This pull request is a large upstream merge that introduces a wide range of improvements and new features. Key changes include updating the Go version and dependencies, migrating from gogo/protobuf to the more performant vtprotobuf, and a significant overhaul of the build system using Docker Buildx Bake.

The file copying and synchronization logic has been enhanced with new features like string-based file mode settings, an option to always replace destination paths, and improved handling of directory timestamps. The fsutil file-transfer protocol is now more robust with platform-agnostic path handling. Additionally, there are bug fixes and improvements in filtering, hardlink handling, and platform-specific code for BSD variants.

The overall quality of the changes is high, with new features being accompanied by tests. However, I've identified a critical issue in bench/diffcopy.go where a merge conflict was left unresolved. This must be addressed before the pull request can be merged.