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Dir : /proc/self/root/opt/alt/alt-nodejs8/root/usr/lib/node_modules/npm/lib/install/action/
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Dir : //proc/self/root/opt/alt/alt-nodejs8/root/usr/lib/node_modules/npm/lib/install/action/remove.js

'use strict'
var path = require('path')
var fs = require('graceful-fs')
var rimraf = require('rimraf')
var asyncMap = require('slide').asyncMap
var mkdirp = require('gentle-fs').mkdir
var npm = require('../../npm.js')
var andIgnoreErrors = require('../and-ignore-errors.js')
var move = require('../../utils/move.js')
var isInside = require('path-is-inside')
var vacuum = require('fs-vacuum')

// This is weird because we want to remove the module but not it's node_modules folder
// allowing for this allows us to not worry about the order of operations
module.exports = function (staging, pkg, log, next) {
  log.silly('remove', pkg.path)
  if (pkg.target) {
    removeLink(pkg, next)
  } else {
    removeDir(pkg, log, next)
  }
}

function removeLink (pkg, next) {
  var base = isInside(pkg.path, npm.prefix) ? npm.prefix : pkg.path
  rimraf(pkg.path, (err) => {
    if (err) return next(err)
    vacuum(pkg.path, {base: base}, next)
  })
}

function removeDir (pkg, log, next) {
  var modpath = path.join(path.dirname(pkg.path), '.' + path.basename(pkg.path) + '.MODULES')

  move(path.join(pkg.path, 'node_modules'), modpath).then(unbuildPackage, unbuildPackage)

  function unbuildPackage (moveEr) {
    rimraf(pkg.path, moveEr ? andRemoveEmptyParents(pkg.path) : moveModulesBack)
  }

  function andRemoveEmptyParents (path) {
    return function (er) {
      if (er) return next(er)
      removeEmptyParents(pkg.path)
    }
  }

  function moveModulesBack () {
    fs.readdir(modpath, makeTarget)
  }

  function makeTarget (readdirEr, files) {
    if (readdirEr) return cleanup()
    if (!files.length) return cleanup()
    mkdirp(path.join(pkg.path, 'node_modules'), function (mkdirEr) { moveModules(mkdirEr, files) })
  }

  function moveModules (mkdirEr, files) {
    if (mkdirEr) return next(mkdirEr)
    asyncMap(files, function (file, done) {
      var from = path.join(modpath, file)
      var to = path.join(pkg.path, 'node_modules', file)
      // we ignore errors here, because they can legitimately happen, for instance,
      // bundled modules will be in both node_modules folders
      move(from, to).then(andIgnoreErrors(done), andIgnoreErrors(done))
    }, cleanup)
  }

  function cleanup () {
    rimraf(modpath, afterCleanup)
  }

  function afterCleanup (rimrafEr) {
    if (rimrafEr) log.warn('remove', rimrafEr)
    removeEmptyParents(path.resolve(pkg.path, '..'))
  }

  function removeEmptyParents (pkgdir) {
    fs.rmdir(pkgdir, function (er) {
      // FIXME: Make sure windows does what we want here
      if (er && er.code !== 'ENOENT') return next()
      removeEmptyParents(path.resolve(pkgdir, '..'))
    })
  }
}