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?? access.js(3.23 KB)
?? adduser.js(3.98 KB)
?? bin.js(515 B)
?? bugs.js(857 B)
?? build.js(8.5 KB)
?? cache
?? cache.js(10.17 KB)
?? completion.js(7.06 KB)
?? config
?? config.js(8.27 KB)
?? dedupe.js(5.27 KB)
?? deprecate.js(1.4 KB)
?? dist-tag.js(3.67 KB)
?? docs.js(1.03 KB)
?? edit.js(985 B)
?? explore.js(1.63 KB)
?? fetch-package-metadata.js(11.5 KB)
?? fetch-package-metadata.md(1.76 KB)
?? get.js(235 B)
?? help-search.js(5.65 KB)
?? help.js(6.19 KB)
?? init.js(1.27 KB)
?? install
?? install-test.js(507 B)
?? install.js(25.49 KB)
?? link.js(5.55 KB)
?? logout.js(1.1 KB)
?? ls.js(13.94 KB)
?? npm.js(11.23 KB)
?? outdated.js(12.1 KB)
?? owner.js(7.55 KB)
?? pack.js(1.79 KB)
?? ping.js(556 B)
?? prefix.js(330 B)
?? prune.js(1.5 KB)
?? publish.js(5.02 KB)
?? rebuild.js(2.11 KB)
?? repo.js(1.43 KB)
?? restart.js(64 B)
?? root.js(316 B)
?? run-script.js(5.16 KB)
?? search.js(7.76 KB)
?? set.js(276 B)
?? shrinkwrap.js(6.54 KB)
?? star.js(1.17 KB)
?? stars.js(1.1 KB)
?? start.js(62 B)
?? stop.js(61 B)
?? substack.js(509 B)
?? tag.js(1.08 KB)
?? team.js(1.41 KB)
?? test.js(294 B)
?? unbuild.js(3.97 KB)
?? uninstall.js(2.31 KB)
?? unpublish.js(3.55 KB)
?? update.js(1.76 KB)
?? utils
?? version.js(7.71 KB)
?? view.js(9.12 KB)
?? visnup.js(4.01 KB)
?? whoami.js(1.42 KB)
?? xmas.js(1.57 KB)

Editing: install.js

'use strict'
// npm install <pkg> <pkg> <pkg>
//
// See doc/cli/npm-install.md for more description
//
// Managing contexts...
// there's a lot of state associated with an "install" operation, including
// packages that are already installed, parent packages, current shrinkwrap, and
// so on. We maintain this state in a "context" object that gets passed around.
// every time we dive into a deeper node_modules folder, the "family" list that
// gets passed along uses the previous "family" list as its __proto__.  Any
// "resolved precise dependency" things that aren't already on this object get
// added, and then that's passed to the next generation of installation.

module.exports = install
module.exports.Installer = Installer

var usage = require('./utils/usage')

install.usage = usage(
  'install',
  '\nnpm install (with no args, in package dir)' +
  '\nnpm install [<@scope>/]<pkg>' +
  '\nnpm install [<@scope>/]<pkg>@<tag>' +
  '\nnpm install [<@scope>/]<pkg>@<version>' +
  '\nnpm install [<@scope>/]<pkg>@<version range>' +
  '\nnpm install <folder>' +
  '\nnpm install <tarball file>' +
  '\nnpm install <tarball url>' +
  '\nnpm install <git:// url>' +
  '\nnpm install <github username>/<github project>',
  '[--save|--save-dev|--save-optional] [--save-exact]'
)

install.completion = function (opts, cb) {
  validate('OF', arguments)
  // install can complete to a folder with a package.json, or any package.
  // if it has a slash, then it's gotta be a folder
  // if it starts with https?://, then just give up, because it's a url
  if (/^https?:\/\//.test(opts.partialWord)) {
    // do not complete to URLs
    return cb(null, [])
  }

if (/\//.test(opts.partialWord)) {
    // Complete fully to folder if there is exactly one match and it
    // is a folder containing a package.json file.  If that is not the
    // case we return 0 matches, which will trigger the default bash
    // complete.
    var lastSlashIdx = opts.partialWord.lastIndexOf('/')
    var partialName = opts.partialWord.slice(lastSlashIdx + 1)
    var partialPath = opts.partialWord.slice(0, lastSlashIdx)
    if (partialPath === '') partialPath = '/'

var annotatePackageDirMatch = function (sibling, cb) {
      var fullPath = path.join(partialPath, sibling)
      if (sibling.slice(0, partialName.length) !== partialName) {
        return cb(null, null) // not name match
      }
      fs.readdir(fullPath, function (err, contents) {
        if (err) return cb(null, { isPackage: false })

cb(
          null,
          {
            fullPath: fullPath,
            isPackage: contents.indexOf('package.json') !== -1
          }
        )
      })
    }

return fs.readdir(partialPath, function (err, siblings) {
      if (err) return cb(null, []) // invalid dir: no matching

asyncMap(siblings, annotatePackageDirMatch, function (err, matches) {
        if (err) return cb(err)

var cleaned = matches.filter(function (x) { return x !== null })
        if (cleaned.length !== 1) return cb(null, [])
        if (!cleaned[0].isPackage) return cb(null, [])

// Success - only one match and it is a package dir
        return cb(null, [cleaned[0].fullPath])
      })
    })
  }

// FIXME: there used to be registry completion here, but it stopped making
  // sense somewhere around 50,000 packages on the registry
  cb()
}

// system packages
var fs = require('fs')
var path = require('path')

// dependencies
var log = require('npmlog')
var readPackageTree = require('read-package-tree')
var chain = require('slide').chain
var asyncMap = require('slide').asyncMap
var archy = require('archy')
var mkdirp = require('mkdirp')
var rimraf = require('rimraf')
var iferr = require('iferr')
var validate = require('aproba')

// npm internal utils
var npm = require('./npm.js')
var locker = require('./utils/locker.js')
var lock = locker.lock
var unlock = locker.unlock
var ls = require('./ls.js')
var parseJSON = require('./utils/parse-json.js')
var output = require('./utils/output.js')

// install specific libraries
var copyTree = require('./install/copy-tree.js')
var readShrinkwrap = require('./install/read-shrinkwrap.js')
var recalculateMetadata = require('./install/deps.js').recalculateMetadata
var loadDeps = require('./install/deps.js').loadDeps
var loadDevDeps = require('./install/deps.js').loadDevDeps
var getAllMetadata = require('./install/deps.js').getAllMetadata
var loadRequestedDeps = require('./install/deps.js').loadRequestedDeps
var loadExtraneous = require('./install/deps.js').loadExtraneous
var diffTrees = require('./install/diff-trees.js')
var checkPermissions = require('./install/check-permissions.js')
var decomposeActions = require('./install/decompose-actions.js')
var filterInvalidActions = require('./install/filter-invalid-actions.js')
var validateTree = require('./install/validate-tree.js')
var validateArgs = require('./install/validate-args.js')
var saveRequested = require('./install/save.js').saveRequested
var getSaveType = require('./install/save.js').getSaveType
var doSerialActions = require('./install/actions.js').doSerial
var doReverseSerialActions = require('./install/actions.js').doReverseSerial
var doParallelActions = require('./install/actions.js').doParallel
var doOneAction = require('./install/actions.js').doOne
var removeObsoleteDep = require('./install/deps.js').removeObsoleteDep
var packageId = require('./utils/package-id.js')
var moduleName = require('./utils/module-name.js')
var errorMessage = require('./utils/error-message.js')
var andIgnoreErrors = require('./install/and-ignore-errors.js')

function unlockCB (lockPath, name, cb) {
  validate('SSF', arguments)
  return function (installEr) {
    var args = arguments
    try {
      unlock(lockPath, name, reportErrorAndReturn)
    } catch (unlockEx) {
      process.nextTick(function () {
        reportErrorAndReturn(unlockEx)
      })
    }
    function reportErrorAndReturn (unlockEr) {
      if (installEr) {
        if (unlockEr && unlockEr.code !== 'ENOTLOCKED') {
          log.warn('unlock' + name, unlockEr)
        }
        return cb.apply(null, args)
      }
      if (unlockEr) return cb(unlockEr)
      return cb.apply(null, args)
    }
  }
}

function install (where, args, cb) {
  if (!cb) {
    cb = args
    args = where
    where = null
  }
  var globalTop = path.resolve(npm.globalDir, '..')
  if (!where) {
    where = npm.config.get('global')
          ? globalTop
          : npm.prefix
  }
  validate('SAF', [where, args, cb])
  // the /path/to/node_modules/..
  var dryrun = !!npm.config.get('dry-run')

if (npm.config.get('dev')) {
    log.warn('install', 'Usage of the `--dev` option is deprecated. Use `--only=dev` instead.')
  }

if (where === globalTop && !args.length) {
    args = ['.']
  }
  args = args.filter(function (a) {
    return path.resolve(a) !== npm.prefix
  })

new Installer(where, dryrun, args).run(cb)
}

function Installer (where, dryrun, args) {
  validate('SBA', arguments)
  this.where = where
  this.dryrun = dryrun
  this.args = args
  this.currentTree = null
  this.idealTree = null
  this.differences = []
  this.todo = []
  this.progress = {}
  this.noPackageJsonOk = !!args.length
  this.topLevelLifecycles = !args.length
  this.npat = npm.config.get('npat')
  this.dev = npm.config.get('dev') || (!/^prod(uction)?$/.test(npm.config.get('only')) && !npm.config.get('production')) || /^dev(elopment)?$/.test(npm.config.get('only'))
  this.prod = !/^dev(elopment)?$/.test(npm.config.get('only'))
  this.rollback = npm.config.get('rollback')
  this.link = npm.config.get('link')
  this.global = this.where === path.resolve(npm.globalDir, '..')
}
Installer.prototype = {}

Installer.prototype.run = function (cb) {
  validate('F', arguments)

// FIXME: This is bad and I should feel bad.
  // lib/install needs to have some way of sharing _limited_
  // state with the things it calls. Passing the object is too
  // much. The global config is WAY too much. =( =(
  // But not having this is gonna break linked modules in
  // subtle stupid ways, and refactoring all this code isn't
  // the right thing to do just yet.
  if (this.global) {
    var prevGlobal = npm.config.get('global')
    npm.config.set('global', true)
    var next = cb
    cb = function () {
      npm.config.set('global', prevGlobal)
      next.apply(null, arguments)
    }
  }

var installSteps = []
  var postInstallSteps = []
  installSteps.push(
    [this.newTracker(log, 'loadCurrentTree', 4)],
    [this, this.loadCurrentTree],
    [this, this.finishTracker, 'loadCurrentTree'],

[this.newTracker(log, 'loadIdealTree', 12)],
    [this, this.loadIdealTree],
    [this, this.finishTracker, 'loadIdealTree'],

[this, this.debugTree, 'currentTree', 'currentTree'],
    [this, this.debugTree, 'idealTree', 'idealTree'],

[this.newTracker(log, 'generateActionsToTake')],
    [this, this.generateActionsToTake],
    [this, this.finishTracker, 'generateActionsToTake'],

[this, this.debugActions, 'diffTrees', 'differences'],
    [this, this.debugActions, 'decomposeActions', 'todo'])
  if (!this.dryrun) {
    installSteps.push(
      [this.newTracker(log, 'runTopLevelLifecycles', 2)],
      [this, this.runPreinstallTopLevelLifecycles],

[this.newTracker(log, 'executeActions', 8)],
      [this, this.executeActions],
      [this, this.finishTracker, 'executeActions'])
    var node_modules = path.resolve(this.where, 'node_modules')
    var staging = path.resolve(node_modules, '.staging')
    postInstallSteps.push(
      [this.newTracker(log, 'rollbackFailedOptional', 1)],
      [this, this.rollbackFailedOptional, staging, this.todo],
      [this, this.finishTracker, 'rollbackFailedOptional'],
      [this, this.commit, staging, this.todo],

[this, this.runPostinstallTopLevelLifecycles],
      [this, this.finishTracker, 'runTopLevelLifecycles'])
    if (getSaveType(this.args)) {
      postInstallSteps.push(
        [this, this.saveToDependencies])
    }
  }
  postInstallSteps.push(
    [this, this.printInstalled])

var self = this
  chain(installSteps, function (installEr) {
    if (installEr) self.failing = true
    chain(postInstallSteps, function (postInstallEr) {
      if (self.idealTree) {
        self.idealTree.warnings.forEach(function (warning) {
          if (warning.code === 'EPACKAGEJSON' && self.global) return
          if (warning.code === 'ENOTDIR') return
          var output = errorMessage(warning)
          output.summary.forEach(function (logline) {
            log.warn.apply(log, logline)
          })
          output.detail.forEach(function (logline) {
            log.verbose.apply(log, logline)
          })
        })
      }
      if (installEr && postInstallEr) {
        var msg = errorMessage(postInstallEr)
        msg.summary.forEach(function (logline) {
          log.warn.apply(log, logline)
        })
        msg.detail.forEach(function (logline) {
          log.verbose.apply(log, logline)
        })
      }
      cb(installEr || postInstallEr, self.getInstalledModules(), self.idealTree)
    })
  })
}

Installer.prototype.loadArgMetadata = function (next) {
  var self = this
  getAllMetadata(this.args, this.currentTree, process.cwd(), iferr(next, function (args) {
    self.args = args
    next()
  }))
}

Installer.prototype.newTracker = function (tracker, name, size) {
  validate('OS', [tracker, name])
  if (size) validate('N', [size])
  this.progress[name] = tracker.newGroup(name, size)
  var self = this
  return function (next) {
    self.progress[name].silly(name, 'Starting')
    next()
  }
}

Installer.prototype.finishTracker = function (name, cb) {
  validate('SF', arguments)
  this.progress[name].silly(name, 'Finishing')
  this.progress[name].finish()
  cb()
}

Installer.prototype.loadCurrentTree = function (cb) {
  validate('F', arguments)
  log.silly('install', 'loadCurrentTree')
  var todo = []
  if (this.global) {
    todo.push([this, this.readGlobalPackageData])
  } else {
    todo.push([this, this.readLocalPackageData])
  }
  todo.push(
    [this, this.normalizeTree, log.newGroup('normalizeTree')])
  chain(todo, cb)
}

Installer.prototype.loadIdealTree = function (cb) {
  validate('F', arguments)
  log.silly('install', 'loadIdealTree')

chain([
    [this.newTracker(this.progress.loadIdealTree, 'cloneCurrentTree')],
    [this, this.cloneCurrentTreeToIdealTree],
    [this, this.finishTracker, 'cloneCurrentTree'],

[this.newTracker(this.progress.loadIdealTree, 'loadShrinkwrap')],
    [this, this.loadShrinkwrap],
    [this, this.finishTracker, 'loadShrinkwrap'],

[this.newTracker(this.progress.loadIdealTree, 'loadAllDepsIntoIdealTree', 10)],
    [this, this.loadAllDepsIntoIdealTree],
    [this, this.finishTracker, 'loadAllDepsIntoIdealTree'],

// TODO: Remove this (should no longer be necessary, instead counter productive)
    [this, function (next) { recalculateMetadata(this.idealTree, log, next) }]
  ], cb)
}

Installer.prototype.loadAllDepsIntoIdealTree = function (cb) {
  validate('F', arguments)
  log.silly('install', 'loadAllDepsIntoIdealTree')
  var saveDeps = getSaveType(this.args)

var cg = this.progress.loadAllDepsIntoIdealTree
  var installNewModules = !!this.args.length
  var steps = []

if (installNewModules) {
    steps.push([validateArgs, this.idealTree, this.args])
    steps.push([loadRequestedDeps, this.args, this.idealTree, saveDeps, cg.newGroup('loadRequestedDeps')])
  } else {
    if (this.prod) {
      steps.push(
        [loadDeps, this.idealTree, cg.newGroup('loadDeps')])
    }
    if (this.dev) {
      steps.push(
        [loadDevDeps, this.idealTree, cg.newGroup('loadDevDeps')])
    }
  }
  steps.push(
    [loadExtraneous.andResolveDeps, this.idealTree, cg.newGroup('loadExtraneous')])
  chain(steps, cb)
}

Installer.prototype.generateActionsToTake = function (cb) {
  validate('F', arguments)
  log.silly('install', 'generateActionsToTake')
  var cg = this.progress.generateActionsToTake
  chain([
    [validateTree, this.idealTree, cg.newGroup('validateTree')],
    [diffTrees, this.currentTree, this.idealTree, this.differences, cg.newGroup('diffTrees')],
    [this, this.computeLinked],
    [filterInvalidActions, this.where, this.differences],
    [checkPermissions, this.differences],
    [decomposeActions, this.differences, this.todo]
  ], cb)
}

Installer.prototype.computeLinked = function (cb) {
  validate('F', arguments)
  if (!this.link || this.global) return cb()
  var linkTodoList = []
  var self = this
  asyncMap(this.differences, function (action, next) {
    var cmd = action[0]
    var pkg = action[1]
    if (cmd !== 'add' && cmd !== 'update') return next()
    var isReqByTop = pkg.requiredBy.filter(function (mod) { return mod.isTop }).length
    var isReqByUser = pkg.userRequired
    var isExtraneous = pkg.requiredBy.length === 0
    if (!isReqByTop && !isReqByUser && !isExtraneous) return next()
    isLinkable(pkg, function (install, link) {
      if (install) linkTodoList.push(['global-install', pkg])
      if (link) linkTodoList.push(['global-link', pkg])
      if (install || link) removeObsoleteDep(pkg)
      next()
    })
  }, function () {
    if (linkTodoList.length === 0) return cb()
    self.differences.length = 0
    Array.prototype.push.apply(self.differences, linkTodoList)
    diffTrees(self.currentTree, self.idealTree, self.differences, log.newGroup('d2'), cb)
  })
}

function isLinkable (pkg, cb) {
  var globalPackage = path.resolve(npm.globalPrefix, 'lib', 'node_modules', moduleName(pkg))
  var globalPackageJson = path.resolve(globalPackage, 'package.json')
  fs.stat(globalPackage, function (er) {
    if (er) return cb(true, true)
    fs.readFile(globalPackageJson, function (er, data) {
      var json = parseJSON.noExceptions(data)
      cb(false, json && json.version === pkg.package.version)
    })
  })
}

Installer.prototype.executeActions = function (cb) {
  validate('F', arguments)
  log.silly('install', 'executeActions')
  var todo = this.todo
  var cg = this.progress.executeActions

var node_modules = path.resolve(this.where, 'node_modules')
  var staging = path.resolve(node_modules, '.staging')
  var steps = []
  var trackLifecycle = cg.newGroup('lifecycle')

cb = unlockCB(node_modules, '.staging', cb)

steps.push(
    [doSerialActions, 'global-install', staging, todo, trackLifecycle.newGroup('global-install')],
    [doParallelActions, 'fetch', staging, todo, cg.newGroup('fetch', 10)],
    [lock, node_modules, '.staging'],
    [rimraf, staging],
    [mkdirp, staging],
    [doParallelActions, 'extract', staging, todo, cg.newGroup('extract', 10)],
    [doParallelActions, 'preinstall', staging, todo, trackLifecycle.newGroup('preinstall')],
    [doReverseSerialActions, 'remove', staging, todo, cg.newGroup('remove')],
    [doSerialActions, 'move', staging, todo, cg.newGroup('move')],
    [doSerialActions, 'finalize', staging, todo, cg.newGroup('finalize')],
    [doSerialActions, 'build', staging, todo, trackLifecycle.newGroup('build')],
    [doSerialActions, 'global-link', staging, todo, trackLifecycle.newGroup('global-link')],
    [doParallelActions, 'update-linked', staging, todo, trackLifecycle.newGroup('update-linked')],
    [doSerialActions, 'install', staging, todo, trackLifecycle.newGroup('install')],
    [doSerialActions, 'postinstall', staging, todo, trackLifecycle.newGroup('postinstall')])
  if (this.npat) {
    steps.push(
      [doParallelActions, 'test', staging, todo, trackLifecycle.newGroup('npat')])
  }

var self = this
  chain(steps, function (er) {
    if (!er || self.rollback) {
      rimraf(staging, function () { cb(er) })
    } else {
      cb(er)
    }
  })
}

Installer.prototype.rollbackFailedOptional = function (staging, actionsToRun, cb) {
  if (!this.rollback) return cb()
  var failed = actionsToRun.map(function (action) {
    return action[1]
  }).filter(function (pkg) {
    return pkg.failed && pkg.rollback
  })
  asyncMap(failed, function (pkg, next) {
    asyncMap(pkg.rollback, function (rollback, done) {
      rollback(staging, pkg, done)
    }, next)
  }, cb)
}

Installer.prototype.commit = function (staging, actionsToRun, cb) {
  var toCommit = actionsToRun.map(function (action) { return action[1] }).filter(function (pkg) { return !pkg.failed && pkg.commit })
  asyncMap(toCommit, function (pkg, next) {
    asyncMap(pkg.commit, function (commit, done) {
      commit(staging, pkg, done)
    }, function () {
      pkg.commit = []
      next.apply(null, arguments)
    })
  }, cb)
}

Installer.prototype.runPreinstallTopLevelLifecycles = function (cb) {
  validate('F', arguments)
  if (this.failing) return cb()
  if (!this.topLevelLifecycles) return cb()
  log.silly('install', 'runPreinstallTopLevelLifecycles')
  var steps = []
  var trackLifecycle = this.progress.runTopLevelLifecycles

steps.push(
    [doOneAction, 'preinstall', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('preinstall:.')]
  )
  chain(steps, cb)
}

Installer.prototype.runPostinstallTopLevelLifecycles = function (cb) {
  validate('F', arguments)
  if (this.failing) return cb()
  if (!this.topLevelLifecycles) return cb()
  log.silly('install', 'runPostinstallTopLevelLifecycles')
  var steps = []
  var trackLifecycle = this.progress.runTopLevelLifecycles

steps.push(
    [doOneAction, 'build', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('build:.')],
    [doOneAction, 'install', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('install:.')],
    [doOneAction, 'postinstall', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('postinstall:.')])
  if (this.npat) {
    steps.push(
      [doOneAction, 'test', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('npat:.')])
  }
  if (this.dev) {
    steps.push(
      [doOneAction, 'prepublish', this.idealTree.path, this.idealTree, trackLifecycle.newGroup('prepublish')])
  }
  chain(steps, cb)
}

Installer.prototype.saveToDependencies = function (cb) {
  validate('F', arguments)
  if (this.failing) return cb()
  log.silly('install', 'saveToDependencies')
  saveRequested(this.args, this.idealTree, cb)
}

Installer.prototype.readGlobalPackageData = function (cb) {
  validate('F', arguments)
  log.silly('install', 'readGlobalPackageData')
  var self = this
  this.loadArgMetadata(iferr(cb, function () {
    mkdirp(self.where, iferr(cb, function () {
      var pkgs = {}
      self.args.forEach(function (pkg) {
        pkgs[pkg.name] = true
      })
      readPackageTree(self.where, function (ctx, kid) { return ctx.parent || pkgs[kid] }, iferr(cb, function (currentTree) {
        self.currentTree = currentTree
        return cb()
      }))
    }))
  }))
}

Installer.prototype.readLocalPackageData = function (cb) {
  validate('F', arguments)
  log.silly('install', 'readLocalPackageData')
  var self = this
  mkdirp(this.where, iferr(cb, function () {
    readPackageTree(self.where, iferr(cb, function (currentTree) {
      self.currentTree = currentTree
      self.currentTree.warnings = []
      if (currentTree.error && currentTree.error.code === 'EJSONPARSE') {
        return cb(currentTree.error)
      }
      if (!self.noPackageJsonOk && !currentTree.package) {
        log.error('install', "Couldn't read dependencies")
        var er = new Error("ENOENT, open '" + path.join(self.where, 'package.json') + "'")
        er.code = 'ENOPACKAGEJSON'
        er.errno = 34
        return cb(er)
      }
      if (!currentTree.package) currentTree.package = {}
      if (currentTree.package._shrinkwrap) {
        self.loadArgMetadata(cb)
      } else {
        fs.readFile(path.join(self.where, 'npm-shrinkwrap.json'), function (er, data) {
          if (er) return self.loadArgMetadata(cb)
          try {
            currentTree.package._shrinkwrap = parseJSON(data)
          } catch (ex) {
            return cb(ex)
          }
          return self.loadArgMetadata(cb)
        })
      }
    }))
  }))
}

Installer.prototype.cloneCurrentTreeToIdealTree = function (cb) {
  validate('F', arguments)
  log.silly('install', 'cloneCurrentTreeToIdealTree')
  this.idealTree = copyTree(this.currentTree)
  this.idealTree.warnings = []
  cb()
}

Installer.prototype.loadShrinkwrap = function (cb) {
  validate('F', arguments)
  log.silly('install', 'loadShrinkwrap')
  var installNewModules = !!this.args.length
  if (installNewModules) {
    readShrinkwrap(this.idealTree, cb)
  } else {
    readShrinkwrap.andInflate(this.idealTree, cb)
  }
}

Installer.prototype.normalizeTree = function (log, cb) {
  validate('OF', arguments)
  log.silly('install', 'normalizeTree')
  recalculateMetadata(this.currentTree, log, iferr(cb, function (tree) {
    tree.children.forEach(function (child) {
      if (child.requiredBy.length === 0) {
        child.existing = true
      }
    })
    cb(null, tree)
  }))
}

Installer.prototype.getInstalledModules = function () {
  return this.differences.filter(function (action) {
    var mutation = action[0]
    return (mutation === 'add' || mutation === 'update')
  }).map(function (action) {
    var child = action[1]
    return [child.package._id, child.path]
  })
}

Installer.prototype.printInstalled = function (cb) {
  validate('F', arguments)
  log.silly('install', 'printInstalled')
  var self = this
  this.differences.forEach(function (action) {
    var mutation = action[0]
    var child = action[1]
    var name = packageId(child)
    var where = path.relative(self.where, child.path)
    if (mutation === 'remove') {
      output('- ' + name + ' ' + where)
    } else if (mutation === 'move') {
      var oldWhere = path.relative(self.where, child.fromPath)
      output(name + ' ' + oldWhere + ' -> ' + where)
    }
  })
  var addedOrMoved = this.differences.filter(function (action) {
    var mutation = action[0]
    var child = action[1]
    return !child.failed && (mutation === 'add' || mutation === 'update')
  }).map(function (action) {
    var child = action[1]
    return child.path
  })
  if (!addedOrMoved.length) return cb()
  // TODO: remove the recalculateMetadata, should not be needed
  recalculateMetadata(this.idealTree, log, iferr(cb, function (tree) {
    // These options control both how installs happen AND how `ls` shows output.
    // Something like `npm install --production` only installs production deps.
    // By contrast `npm install --production foo` installs `foo` and the
    // `production` option is ignored. But when it comes time for `ls` to show
    // its output, it excludes the thing we just installed because that flag.
    // The summary output we get should be unfiltered, showing everything
    // installed, so we clear these options before calling `ls`.
    npm.config.set('production', false)
    npm.config.set('dev', false)
    npm.config.set('only', '')
    npm.config.set('also', '')
    ls.fromTree(self.where, tree, addedOrMoved, false, andIgnoreErrors(cb))
  }))
}

Installer.prototype.debugActions = function (name, actionListName, cb) {
  validate('SSF', arguments)
  var actionsToLog = this[actionListName]
  log.silly(name, 'action count', actionsToLog.length)
  actionsToLog.forEach(function (action) {
    log.silly(name, action.map(function (value) {
      return (value && value.package) ? packageId(value) : value
    }).join(' '))
  })
  cb()
}

// This takes an object and a property name instead of a value to allow us
// to define the arguments for use by chain before the property exists yet.
Installer.prototype.debugTree = function (name, treeName, cb) {
  validate('SSF', arguments)
  log.silly(name, this.prettify(this[treeName]).trim())
  cb()
}

Installer.prototype.prettify = function (tree) {
  validate('O', arguments)
  var seen = {}
  function byName (aa, bb) {
    return packageId(aa).localeCompare(packageId(bb))
  }
  function expandTree (tree) {
    seen[tree.path] = true
    return {
      label: packageId(tree),
      nodes: tree.children.filter(function (tree) { return !seen[tree.path] }).sort(byName).map(expandTree)
    }
  }
  return archy(expandTree(tree), '', { unicode: npm.config.get('unicode') })
}

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