Check permission before stat method to avoid errors

问题

My first time ever trying to traverse directories, but stat is throwing errors for some of the directories due to what seems to be a lack of permission.

Error: EPERM: operation not permitted, stat 'K:\System Volume Information'

I'd like to simply avoid calling stat on a given directory in the first place if it is going to throw an error, yet I can't figure out how to do it.

I've tried looking into ignoring protected directories altogether. However, all of the questions I came across used regular expressions that – to my limited knowledge of MacOS, Linux, and how things are handled under the hood on Windows – didn't seem to be applicable to the Windows environment.

I've tried checking the read and write permissions of the directory before making any call to stat, but this doesn't seem to do anything?

async function scanDirs(){
  const
    r = await fsp.readFile('./config.json', 'utf8'),
    archives = JSON.parse(r).archives,
    fs = require('fs'),
    { join } = require('path'),
    traverse = async (dir) => {
      try {
        const perm = await fsp.access(dir, fs.constants.R_OK)
        if (perm === undefined){
          const stats = await fsp.stat(dir)
          if (stats.isDirectory()){
            const subfolders = await fsp.readdir(dir)
            subfolders.forEach(path => {
              const fullPath = join(dir, path)
              traverse( fullPath )
            })
          }
        }
      }
      catch (error){
        console.error(error)
      }
    }

  for (const dir of archives){
    traverse(dir)
  }
}

I've also just tried checking the permissions of a given folder's children before feeding them back into traverse, but this doesn't work either.

            for (const path of subfolders){
              const
                fullPath = join(dir, path),
                perm = await fsp.access(fullPath, fs.constants.R_OK)
              if (perm === undefined) traverse(fullPath)
            }

Any help would be appreciated.

来源：https://stackoverflow.com/questions/58619990/check-permission-before-stat-method-to-avoid-errors