Get all filenames inside an Golang embedded filesystem.

main.go

func getAllFilenames(fs *embed.FS, path string) (out []string, err error) {
	if len(path) == 0 {
		path = "."
	}
	entries, err := fs.ReadDir(path)
	if err != nil {
		return nil, err
	}
	for _, entry := range entries {
		fp := filepath.Join(path, entry.Name())
		if entry.IsDir() {
			res, err := getAllFilenames(fs, fp)
			if err != nil {
				return nil, err
			}
			out = append(out, res...)
			continue
		}
		out = append(out, fp)
	}
	return
}