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: /proc/self/root/lib/node_modules/npm/lib/utils/

files >> //proc/self/root/lib/node_modules/npm/lib/utils/locker.js

 var crypto = require('crypto')
var resolve = require('path').resolve

var lockfile = require('lockfile')
var log = require('npmlog')

var npm = require('../npm.js')
var correctMkdir = require('../utils/correct-mkdir.js')

var installLocks = {}

function lockFileName (base, name) {
  var c = name.replace(/[^a-zA-Z0-9]+/g, '-').replace(/^-+|-+$/g, '')
  var p = resolve(base, name)
  var h = crypto.createHash('sha1').update(p).digest('hex')
  var l = resolve(npm.cache, '_locks')

  return resolve(l, c.substr(0, 24) + '-' + h.substr(0, 16) + '.lock')
}

function lock (base, name, cb) {
  var lockDir = resolve(npm.cache, '_locks')
  correctMkdir(lockDir, function (er) {
    if (er) return cb(er)

    var opts = {
      stale: npm.config.get('cache-lock-stale'),
      retries: npm.config.get('cache-lock-retries'),
      wait: npm.config.get('cache-lock-wait')
    }
    var lf = lockFileName(base, name)
    lockfile.lock(lf, opts, function (er) {
      if (er) log.warn('locking', lf, 'failed', er)

      if (!er) {
        log.verbose('lock', 'using', lf, 'for', resolve(base, name))
        installLocks[lf] = true
      }

      cb(er)
    })
  })
}

function unlock (base, name, cb) {
  var lf = lockFileName(base, name)
  var locked = installLocks[lf]
  if (locked === false) {
    return process.nextTick(cb)
  } else if (locked === true) {
    lockfile.unlock(lf, function (er) {
      if (er) {
        log.warn('unlocking', lf, 'failed', er)
      } else {
        installLocks[lf] = false
        log.verbose('unlock', 'done using', lf, 'for', resolve(base, name))
      }

      cb(er)
    })
  } else {
    var notLocked = new Error(
      'Attempt to unlock ' + resolve(base, name) + ", which hasn't been locked"
    )
    notLocked.code = 'ENOTLOCKED'
    throw notLocked
  }
}

module.exports = {
  lock: lock,
  unlock: unlock
}

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