fs: add initial syscall.Flock abstraction

amery commented 2 weeks ago

excluive lock, only only actually implemented for linux. it will compile and pretend to lock on windows

Summary by CodeRabbit

New Features
- Introduced a new flock package for file locking functionality across different operating systems (Linux and Windows).
- Added methods for locking, opening, and closing files to ensure safe access in concurrent environments.
Platform-Specific Enhancements
- Implemented file locking for Linux systems.
- Added a placeholder implementation for file locking on Windows systems.

deepsource-io[bot] commented 2 weeks ago

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Commits
Files that changed from the base of the PR and between 4d487a7fa3c5af9b7617b662c761b064cc683dde and 2a5e475aea359847f438960ffe96eb89f004af14.

Walkthrough

The changes introduce a new package named flock, which provides file locking functionality across different operating systems. It includes a wrapper around the syscall.Flock for managing file locks, with platform-specific implementations for Linux and Windows. The package defines a Handle type, methods for file operations, and functions to lock files exclusively. The Linux implementation utilizes syscall.Flock, while the Windows version includes a placeholder for similar functionality.

Changes

File	Change Summary
`fs/flock/flock.go`	Introduced package `flock` with function `LockEx` for exclusive file locking.
`fs/flock/flock_linux.go`	Added Linux-specific implementation with `Handle` type and functions `LockEx` and `UnlockEx` for file locking.
`fs/flock/flock_windows.go`	Added Windows-specific implementation with alias `Handle` and placeholder `LockEx` and `UnlockEx` functions.
`fs/syscall/syscall.go`	Introduced package `syscall` with function `Open` for opening files and methods for closing and checking handles.
`fs/syscall/syscall_linux.go`	Added Linux-specific file descriptor handling with `Handle` type and locking functions.
`fs/syscall/syscall_windows.go`	Added Windows-specific file descriptor handling with `Handle` type and placeholder locking functions.

Suggested labels

enhancement, x/fs

Suggested reviewers

karasz

Poem

In the land where files do play,
Locks are set to keep them at bay.
With flock we dance, both night and day,
Ensuring safe paths, come what may.
A hop, a skip, a lock so bright,
In CodeRabbit's world, all feels just right! 🐇✨

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amery commented 2 weeks ago

@coderabbitai review again

coderabbitai[bot] commented 2 weeks ago

@amery: I will review the changes.

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amery commented 2 weeks ago

The package is explicitly about flock but I wonder about splitting this into:

flock.go
syscall.go
syscall_linux.go
syscall_windows.go

or even a dedicated x/fs/syscall package for Handle

amery commented 2 weeks ago

refactored into x/fs/syscall and x/fs/flock, and Lock() function renamed to LockEx()

amery commented 2 weeks ago

to shadow or not to shadow, that is always the question with darvaza.org/x

amery commented 2 weeks ago

not to shadow. renamed to x/fs/fssyscall

amery commented 2 weeks ago

darvaza.org/x/fs@v0.3.0 tagged

darvaza-proxy / x