// Copyright (C) 2024  Umorpha Systems
// SPDX-License-Identifier: AGPL-3.0-or-later

package gitcache

import (
	"errors"
	"os"
	"time"
)

func touch(filename string) error {
	fh, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0o666)
	if err != nil {
		return err
	}
	return fh.Close()
}

func mtime(filename string) (time.Time, error) {
	fi, err := os.Stat(filename)
	if err != nil {
		return time.Time{}, err
	}
	return fi.ModTime(), nil
}

func mkdirAllowExisting(dirname string) error {
	// Fast-path - we expect to call this with existing dirs far
	// more often than with non-existing dirs.
	if fi, err := os.Stat(dirname); err == nil && fi.IsDir() {
		return nil
	}

	if err := os.Mkdir(dirname, 0o777); err != nil {
		// Check for a race.
		if errors.Is(err, os.ErrExist) {
			if fi, err := os.Stat(dirname); err == nil && fi.IsDir() {
				return nil
			}
		}
		return err
	}

	return nil
}