Go - File Path walk searching for files with suid bit set

findsuid.go

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"syscall"
)

type SuidFile struct {

	FileMode 		string
	FilePermissions string
	FilePath 		string
}

var FileList []SuidFile

func uidForFileInfo(fi os.FileInfo) int {
	return int(fi.Sys().(*syscall.Stat_t).Uid)
}

func findSUID() filepath.WalkFunc {
	return func(path string, file os.FileInfo, err error) error {
		if err != nil {
			return nil
		}

		if !file.IsDir() {

			filePath := path
			fileMode := fmt.Sprintf("%s", file.Mode()) // Convert to string
			filePerm := fmt.Sprintf("%04o", file.Mode().Perm())  // Convert to string

			if err != nil {
				fmt.Println(err)
			}

			patternRegex := "^u" // This checks if sticky bit is set as first character
			isStickyBitSet, _ := regexp.MatchString(patternRegex, fileMode)  // Return true if it is set

			if isStickyBitSet {
				uid := uidForFileInfo(file)

				if uid == 0 {

					fmt.Printf("%v %v %s\n", fileMode, filePerm, filePath) // For debug

					file := SuidFile{
						FileMode: fileMode,
						FilePermissions: filePerm,
						FilePath: filePath}

					FileList = append(FileList, file) // TODO: For future use (json)
				}
			}
		}

		return nil
	}
}

func main() {

	// Equivalent find / -uid 0 -perm -4000 -type f 2>/dev/null

	dirPath := "/"

	err := filepath.Walk(dirPath, findSUID())
	if err != nil {
		fmt.Println(err)
	}

	fmt.Println(FileList) // TODO: For future use (json)
}