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Viewing file:     index.js (1.69 KB)      -rw-r--r--

const cache = new Map()
const fs = require('fs')
const { dirname, resolve } = require('path')


const lstat = path => new Promise((res, rej) =>
  fs.lstat(path, (er, st) => er ? rej(er) : res(st)))

const inferOwner = path => {
  path = resolve(path)
  if (cache.has(path))
    return Promise.resolve(cache.get(path))

  const statThen = st => {
    const { uid, gid } = st
    cache.set(path, { uid, gid })
    return { uid, gid }
  }
  const parent = dirname(path)
  const parentTrap = parent === path ? null : er => {
    return inferOwner(parent).then((owner) => {
      cache.set(path, owner)
      return owner
    })
  }
  return lstat(path).then(statThen, parentTrap)
}

const inferOwnerSync = path => {
  path = resolve(path)
  if (cache.has(path))
    return cache.get(path)

  const parent = dirname(path)

  // avoid obscuring call site by re-throwing
  // "catch" the error by returning from a finally,
  // only if we're not at the root, and the parent call works.
  let threw = true
  try {
    const st = fs.lstatSync(path)
    threw = false
    const { uid, gid } = st
    cache.set(path, { uid, gid })
    return { uid, gid }
  } finally {
    if (threw && parent !== path) {
      const owner = inferOwnerSync(parent)
      cache.set(path, owner)
      return owner // eslint-disable-line no-unsafe-finally
    }
  }
}

const inflight = new Map()
module.exports = path => {
  path = resolve(path)
  if (inflight.has(path))
    return Promise.resolve(inflight.get(path))
  const p = inferOwner(path).then(owner => {
    inflight.delete(path)
    return owner
  })
  inflight.set(path, p)
  return p
}
module.exports.sync = inferOwnerSync
module.exports.clearCache = () => {
  cache.clear()
  inflight.clear()
}