aego/project/atomic.go

package project

import (
	"os"
	"path/filepath"
)

func WriteAtomic(abs string, data []byte) error {
	dir := filepath.Dir(abs)
	if err := os.MkdirAll(dir, 0o755); err != nil {
		return err
	}
	tmp, err := os.CreateTemp(dir, ".aego-*.tmp")
	if err != nil {
		return err
	}
	name := tmp.Name()
	if _, err := tmp.Write(data); err != nil {
		tmp.Close()
		os.Remove(name)
		return err
	}
	if err := tmp.Chmod(0o644); err != nil {
		tmp.Close()
		os.Remove(name)
		return err
	}
	if err := tmp.Close(); err != nil {
		os.Remove(name)
		return err
	}
	if err := os.Rename(name, abs); err != nil {
		os.Remove(name)
		return err
	}
	return nil
}