given FC wwn and lun number, find matching dev name

gistfile1.txt

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
)

func main() {
	if len(os.Args) < 3 {
		fmt.Fprintf(os.Stdout, "usage: %s wwn lun_number\n", os.Args[0])
		os.Exit(1)
	}
	wwn := os.Args[1]
	lun := os.Args[2]
	fc_path := "-fc-0x" + wwn + "-lun-" + lun
	dev_path := "/dev/disk/by-path/"
	if dirs, err := ioutil.ReadDir(dev_path); err == nil {
		for _, f := range dirs {
			name := f.Name()
			if strings.Contains(name, fc_path) {
				fmt.Fprintf(os.Stdout, "found %s\n", name)
				if disk, err1 := filepath.EvalSymlinks(dev_path + name); err1 == nil {
					fmt.Fprintf(os.Stderr, "found %s, disk is %s\n", name, disk)
				}
				return
			}
		}
		fmt.Fprintf(os.Stderr, "cannot find %s\n", os.Args[1])
	} else {
		fmt.Fprintf(os.Stderr, "failed to open: %v\n", err)
	}

}