atomicfile

Documentation

Overview

Package atomicfile writes files atomically at 0600 so concurrent writers can't interleave and token-bearing data is never exposed at a looser mode.

Index

• func Write(path string, data []byte) error

Functions

func Write

func Write(path string, data []byte) error

Write stages data to a uniquely-named sibling temp file at 0600, then renames it into place. Rename is atomic on POSIX, and the unique temp name lets concurrent writers each stage their own file without clobbering each other. os.CreateTemp creates the temp file at 0600, so token-bearing callers never expose data at a wider mode.