fetch-package-metadata: use unpipe

for 0.8 compatibility instead of trying to kill the streams by hand

Fixes #8695

PR-URL: #8718

lib/fetch-package-metadata.js

@@ -13,6 +13,7 @@ var iferr = require('iferr')
 var rimraf = require('rimraf')
 var clone = require('lodash.clonedeep')
 var validate = require('aproba')
+var unpipe = require('unpipe')
 
 var npm = require('./npm.js')
 var mapToRegistry = require('./utils/map-to-registry.js')
@@ -256,9 +257,9 @@ function untarStream (tarball, cb) {
   validate('SF', arguments)
   cb = once(cb)
 
-  var tounpipe = []
   var stream
   var file = stream = fs.createReadStream(tarball)
+  var tounpipe = [file]
   file.on('error', function (er) {
     er = new Error('Error extracting ' + tarball + ' archive: ' + er.message)
     er.code = 'EREADFILE'
@@ -287,7 +288,7 @@ function untarStream (tarball, cb) {
       er.code = 'EGUNZIP'
       cb(er)
     })
-    tounpipe.push([stream, gunzip])
+    tounpipe.push(gunzip)
     stream = gunzip
     doUntar()
   }
@@ -299,18 +300,19 @@ function untarStream (tarball, cb) {
       er.code = 'EUNTAR'
       cb(er)
     })
-    tounpipe.push([stream, untar])
+    tounpipe.push(untar)
     stream = untar
     addClose()
   }
 
   function addClose () {
     stream.close = function () {
-      tounpipe.forEach(function (streams) {
-        streams[0].unpipe(streams[1])
+      tounpipe.forEach(function (stream) {
+        unpipe(stream)
       })
 
-      file.close()
+      if (file.close) file.close()
+      if (file.destroy) file.destroy()
     }
   }
 }