package system // import "github.com/docker/docker/pkg/system"

import (
	"os"
	"syscall"
	"time"
	"unsafe"
)

// Used by Chtimes
var maxTime time.Time

func init() {
	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
		// This is a 64 bit timespec
		// os.Chtimes limits time to the following
		//
		// Note that this intentionally sets nsec (not sec), which sets both sec
		// and nsec internally in time.Unix();
		// https://github.com/golang/go/blob/go1.19.2/src/time/time.go#L1364-L1380
		maxTime = time.Unix(0, 1<<63-1)
	} else {
		// This is a 32 bit timespec
		maxTime = time.Unix(1<<31-1, 0)
	}
}

// Chtimes changes the access time and modified time of a file at the given path
func Chtimes(name string, atime time.Time, mtime time.Time) error {
	unixMinTime := time.Unix(0, 0)
	unixMaxTime := maxTime

	// If the modified time is prior to the Unix Epoch, or after the
	// end of Unix Time, os.Chtimes has undefined behavior
	// default to Unix Epoch in this case, just in case

	if atime.Before(unixMinTime) || atime.After(unixMaxTime) {
		atime = unixMinTime
	}

	if mtime.Before(unixMinTime) || mtime.After(unixMaxTime) {
		mtime = unixMinTime
	}

	if err := os.Chtimes(name, atime, mtime); err != nil {
		return err
	}

	// Take platform specific action for setting create time.
	return setCTime(name, mtime)
}