source/pkg/bundle/inode_other.go

//go:build !unix

package bundle

import "path/filepath"

// inodeOf returns a portable fallback identity on platforms without
// syscall.Stat_t inode access (e.g. Windows, wasm). It hashes the resolved
// absolute path so the visited-set still de-duplicates a symlink that points at
// a path already seen. This is weaker than a true inode (two distinct paths to
// the same file via different hardlinks are not deduped), but it is sufficient
// to break path-cycle symlink loops and never panics.
func inodeOf(absPath string) (uint64, bool) {
	resolved, err := filepath.EvalSymlinks(absPath)
	if err != nil {
		resolved = filepath.Clean(absPath)
	}
	return fnv64a(resolved), true
}

// fnv64a is the standard FNV-1a 64-bit hash of s.
func fnv64a(s string) uint64 {
	const (
		offset = 1469598103934665603
		prime  = 1099511628211
	)
	h := uint64(offset)
	for i := 0; i < len(s); i++ {
		h ^= uint64(s[i])
		h *= prime
	}
	return h
}