//go:build unix

package config

import (
	"io/fs"
	"syscall"
)

// inodeOf reports the inode of a file, or 0 when the platform does not expose one.
//
// A rename over the config — which is how every legitimate change is written — changes the inode, so
// this is what makes "the file was replaced" detectable even when the modification time and size
// happen to match, as they do when a pairing is immediately followed by a destroy.
func inodeOf(info fs.FileInfo) uint64 {
	stat, ok := info.Sys().(*syscall.Stat_t)
	if !ok {
		return 0
	}
	return uint64(stat.Ino)
}