//go:build unix

package bundle

import (
	"os"
	"syscall"
)

// inodeOf returns a stable identity (device+inode) for the file at absPath,
// used to break symlink loops and de-duplicate symlink targets that point at
// the same underlying file. On Unix it follows symlinks (os.Stat) so a symlink
// and its target share one identity.
func inodeOf(absPath string) (uint64, bool) {
	info, err := os.Stat(absPath)
	if err != nil {
		return 0, false
	}
	st, ok := info.Sys().(*syscall.Stat_t)
	if !ok {
		return 0, false
	}
	// Combine device and inode so identities are unique across filesystems.
	// Inode alone can collide between two mounts; XOR-folding dev in keeps the
	// visited-set safe without an allocation-heavy composite key.
	return uint64(st.Dev)<<32 ^ uint64(st.Ino), true
}