晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
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Current File : //lib/node_modules/npm/lib/install/check-permissions.js
'use strict'
var path = require('path')
var log = require('npmlog')
var validate = require('aproba')
var uniq = require('lodash.uniq')
var asyncMap = require('slide').asyncMap
var npm = require('../npm.js')
var exists = require('./exists.js')
var writable = require('./writable.js')

module.exports = function (actions, next) {
  validate('AF', arguments)
  var errors = []
  asyncMap(actions, function (action, done) {
    var cmd = action[0]
    var pkg = action[1]
    switch (cmd) {
      case 'add':
        hasAnyWriteAccess(path.resolve(pkg.path, '..'), errors, done)
        break
      case 'update':
      case 'remove':
        hasWriteAccess(pkg.path, errors, andHasWriteAccess(path.resolve(pkg.path, '..'), errors, done))
        break
      case 'move':
        hasAnyWriteAccess(pkg.path, errors, andHasWriteAccess(path.resolve(pkg.fromPath, '..'), errors, done))
        break
      default:
        done()
    }
  }, function () {
    if (!errors.length) return next()
    uniq(errors.map(function (er) { return 'Missing write access to ' + er.path })).forEach(function (er) {
      log.warn('checkPermissions', er)
    })
    npm.config.get('force') ? next() : next(errors[0])
  })
}

function andHasWriteAccess (dir, errors, done) {
  validate('SAF', arguments)
  return function () {
    hasWriteAccess(dir, errors, done)
  }
}

function hasAnyWriteAccess (dir, errors, done) {
  validate('SAF', arguments)
  findNearestDir()
  function findNearestDir () {
    var nextDir = path.resolve(dir, '..')
    exists(dir, function (dirDoesntExist) {
      if (!dirDoesntExist || nextDir === dir) {
        return hasWriteAccess(dir, errors, done)
      } else {
        dir = nextDir
        findNearestDir()
      }
    })
  }
}

function hasWriteAccess (dir, errors, done) {
  validate('SAF', arguments)
  writable(dir, function (er) {
    if (er) errors.push(er)
    done()
  })
}