Index: node_modules/prebuild-install/download.js
===================================================================
--- node_modules/prebuild-install/download.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/prebuild-install/download.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,142 @@
+const path = require('path')
+const fs = require('fs')
+const get = require('simple-get')
+const pump = require('pump')
+const tfs = require('tar-fs')
+const zlib = require('zlib')
+const util = require('./util')
+const error = require('./error')
+const proxy = require('./proxy')
+const mkdirp = require('mkdirp-classic')
+
+function downloadPrebuild (downloadUrl, opts, cb) {
+  let cachedPrebuild = util.cachedPrebuild(downloadUrl)
+  const localPrebuild = util.localPrebuild(downloadUrl, opts)
+  const tempFile = util.tempFile(cachedPrebuild)
+  const log = opts.log || util.noopLogger
+
+  if (opts.nolocal) return download()
+
+  log.info('looking for local prebuild @', localPrebuild)
+  fs.access(localPrebuild, fs.R_OK | fs.W_OK, function (err) {
+    if (err && err.code === 'ENOENT') {
+      return download()
+    }
+
+    log.info('found local prebuild')
+    cachedPrebuild = localPrebuild
+    unpack()
+  })
+
+  function download () {
+    ensureNpmCacheDir(function (err) {
+      if (err) return onerror(err)
+
+      log.info('looking for cached prebuild @', cachedPrebuild)
+      fs.access(cachedPrebuild, fs.R_OK | fs.W_OK, function (err) {
+        if (!(err && err.code === 'ENOENT')) {
+          log.info('found cached prebuild')
+          return unpack()
+        }
+
+        log.http('request', 'GET ' + downloadUrl)
+        const reqOpts = proxy({ url: downloadUrl }, opts)
+
+        if (opts.token) {
+          reqOpts.headers = {
+            'User-Agent': 'simple-get',
+            Accept: 'application/octet-stream',
+            Authorization: 'token ' + opts.token
+          }
+        }
+
+        const req = get(reqOpts, function (err, res) {
+          if (err) return onerror(err)
+          log.http(res.statusCode, downloadUrl)
+          if (res.statusCode !== 200) return onerror()
+          mkdirp(util.prebuildCache(), function () {
+            log.info('downloading to @', tempFile)
+            pump(res, fs.createWriteStream(tempFile), function (err) {
+              if (err) return onerror(err)
+              fs.rename(tempFile, cachedPrebuild, function (err) {
+                if (err) return cb(err)
+                log.info('renaming to @', cachedPrebuild)
+                unpack()
+              })
+            })
+          })
+        })
+
+        req.setTimeout(30 * 1000, function () {
+          req.abort()
+        })
+      })
+
+      function onerror (err) {
+        fs.unlink(tempFile, function () {
+          cb(err || error.noPrebuilts(opts))
+        })
+      }
+    })
+  }
+
+  function unpack () {
+    let binaryName
+
+    const updateName = opts.updateName || function (entry) {
+      if (/\.node$/i.test(entry.name)) binaryName = entry.name
+    }
+
+    log.info('unpacking @', cachedPrebuild)
+
+    const options = {
+      readable: true,
+      writable: true,
+      hardlinkAsFilesFallback: true
+    }
+    const extract = tfs.extract(opts.path, options).on('entry', updateName)
+
+    pump(fs.createReadStream(cachedPrebuild), zlib.createGunzip(), extract,
+      function (err) {
+        if (err) return cb(err)
+
+        let resolved
+        if (binaryName) {
+          try {
+            resolved = path.resolve(opts.path || '.', binaryName)
+          } catch (err) {
+            return cb(err)
+          }
+          log.info('unpack', 'resolved to ' + resolved)
+
+          if (opts.runtime === 'node' && opts.platform === process.platform && opts.abi === process.versions.modules && opts.arch === process.arch) {
+            try {
+              require(resolved)
+            } catch (err) {
+              return cb(err)
+            }
+            log.info('unpack', 'required ' + resolved + ' successfully')
+          }
+        }
+
+        cb(null, resolved)
+      })
+  }
+
+  function ensureNpmCacheDir (cb) {
+    const cacheFolder = util.npmCache()
+    fs.access(cacheFolder, fs.R_OK | fs.W_OK, function (err) {
+      if (err && err.code === 'ENOENT') {
+        return makeNpmCacheDir()
+      }
+      cb(err)
+    })
+
+    function makeNpmCacheDir () {
+      log.info('npm cache directory missing, creating it...')
+      mkdirp(cacheFolder, cb)
+    }
+  }
+}
+
+module.exports = downloadPrebuild