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Edit File : realpath.js \| Size : 2.71 KB
// look up the realpath, but cache stats to minimize overhead // If the parent folder is in the realpath cache, then we just // lstat the child, since there's no need to do a full realpath // This is not a separate module, and is much simpler than Node's // built-in fs.realpath, because we only care about symbolic links, // so we can handle many fewer edge cases. const fs = require('fs') /* istanbul ignore next / const promisify = require('util').promisify \|\| require('util-promisify') const readlink = promisify(fs.readlink) const lstat = promisify(fs.lstat) const { resolve, basename, dirname } = require('path') const realpathCached = (path, rpcache, stcache, depth) => { // just a safety against extremely deep eloops / istanbul ignore next / if (depth > 2000) throw eloop(path) path = resolve(path) if (rpcache.has(path)) return Promise.resolve(rpcache.get(path)) const dir = dirname(path) const base = basename(path) if (base && rpcache.has(dir)) return realpathChild(dir, base, rpcache, stcache, depth) // if it's the root, then we know it's real if (!base) { rpcache.set(dir, dir) return Promise.resolve(dir) } // the parent, what is that? // find out, and then come back. return realpathCached(dir, rpcache, stcache, depth + 1).then(() => realpathCached(path, rpcache, stcache, depth + 1)) } const lstatCached = (path, stcache) => { if (stcache.has(path)) return Promise.resolve(stcache.get(path)) const p = lstat(path).then(st => { stcache.set(path, st) return st }) stcache.set(path, p) return p } // This is a slight fib, as it doesn't actually occur during a stat syscall. // But file systems are giant piles of lies, so whatever. const eloop = path => Object.assign(new Error( `ELOOP: too many symbolic links encountered, stat '${path}'`), { errno: -62, syscall: 'stat', code: 'ELOOP', path: path, }) const realpathChild = (dir, base, rpcache, stcache, depth) => { const realdir = rpcache.get(dir) // that unpossible / istanbul ignore next */ if (typeof realdir === 'undefined') throw new Error('in realpathChild without parent being in realpath cache') const realish = resolve(realdir, base) return lstatCached(realish, stcache).then(st => { if (!st.isSymbolicLink()) { rpcache.set(resolve(dir, base), realish) return realish } let res return readlink(realish).then(target => { const resolved = res = resolve(realdir, target) if (realish === resolved) throw eloop(realish) return realpathCached(resolved, rpcache, stcache, depth + 1) }).then(real => { rpcache.set(resolve(dir, base), real) return real }) }) } module.exports = realpathCached Back

Edit File : realpath.js | Size : 2.71 KB

// look up the realpath, but cache stats to minimize overhead
// If the parent folder is in  the realpath cache, then we just
// lstat the child, since there's no need to do a full realpath
// This is not a separate module, and is much simpler than Node's
// built-in fs.realpath, because we only care about symbolic links,
// so we can handle many fewer edge cases.

const fs = require('fs')
/* istanbul ignore next */
const promisify = require('util').promisify || require('util-promisify')
const readlink = promisify(fs.readlink)
const lstat = promisify(fs.lstat)
const { resolve, basename, dirname } = require('path')

const realpathCached = (path, rpcache, stcache, depth) => {
  // just a safety against extremely deep eloops
  /* istanbul ignore next */
  if (depth > 2000)
    throw eloop(path)

path = resolve(path)
  if (rpcache.has(path))
    return Promise.resolve(rpcache.get(path))

const dir = dirname(path)
  const base = basename(path)

if (base && rpcache.has(dir))
    return realpathChild(dir, base, rpcache, stcache, depth)

// if it's the root, then we know it's real
  if (!base) {
    rpcache.set(dir, dir)
    return Promise.resolve(dir)
  }

// the parent, what is that?
  // find out, and then come back.
  return realpathCached(dir, rpcache, stcache, depth + 1).then(() =>
    realpathCached(path, rpcache, stcache, depth + 1))
}

const lstatCached = (path, stcache) => {
  if (stcache.has(path))
    return Promise.resolve(stcache.get(path))

const p = lstat(path).then(st => {
    stcache.set(path, st)
    return st
  })
  stcache.set(path, p)
  return p
}

// This is a slight fib, as it doesn't actually occur during a stat syscall.
// But file systems are giant piles of lies, so whatever.
const eloop = path =>
  Object.assign(new Error(
    `ELOOP: too many symbolic links encountered, stat '${path}'`), {
    errno: -62,
    syscall: 'stat',
    code: 'ELOOP',
    path: path,
  })

const realpathChild = (dir, base, rpcache, stcache, depth) => {
  const realdir = rpcache.get(dir)
  // that unpossible
  /* istanbul ignore next */
  if (typeof realdir === 'undefined')
    throw new Error('in realpathChild without parent being in realpath cache')

const realish = resolve(realdir, base)
  return lstatCached(realish, stcache).then(st => {
    if (!st.isSymbolicLink()) {
      rpcache.set(resolve(dir, base), realish)
      return realish
    }

let res
    return readlink(realish).then(target => {
      const resolved = res = resolve(realdir, target)
      if (realish === resolved)
        throw eloop(realish)

return realpathCached(resolved, rpcache, stcache, depth + 1)
    }).then(real => {
      rpcache.set(resolve(dir, base), real)
      return real
    })
  })
}

module.exports = realpathCached

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