fileutil

Documentation

Index

• func AtomicWriteFile(dest string, data []byte, perm os.FileMode) error
• func ReplaceFile(tmp, dest string) error

Functions

func AtomicWriteFile

func AtomicWriteFile(dest string, data []byte, perm os.FileMode) error

AtomicWriteFile writes data to dest atomically: it writes to a temp file in the same directory, applies perm, then renames onto dest via ReplaceFile. The temp file is removed on every error path. Use for files that other processes or goroutines may read concurrently (config, caches).

func ReplaceFile

func ReplaceFile(tmp, dest string) error

ReplaceFile renames tmp onto dest, falling back to a copy when the rename fails — Windows encryption-software filter drivers report a cross-device link (EXDEV) for a same-dir rename. The rename error surfaces only if the copy also fails.