Function AtomicWriteFile

internal/fileutil/fileutil.go:29–50

AtomicWriteFile atomically (as atomic as os.Rename allows) writes a file to a disk.

(filename string, reader io.Reader, mode os.FileMode)

// AtomicWriteFile atomically (as atomic as os.Rename allows) writes a file to a
// disk.
func AtomicWriteFile(filename string, reader io.Reader, mode os.FileMode) error {
	tempFile, err := os.CreateTemp(filepath.Split(filename))
	if err != nil {
		return err
	}
	tempName := tempFile.Name()

	if _, err := io.Copy(tempFile, reader); err != nil {
		tempFile.Close() // return value is ignored as we are already on error path
		return err
	}

	if err := tempFile.Close(); err != nil {
		return err
	}

	if err := os.Chmod(tempName, mode); err != nil {
		return err
	}

	return fs.RenameWithFallback(tempName, filename)
}