Index: node_modules/tar/lib/mkdir.js
===================================================================
--- node_modules/tar/lib/mkdir.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/tar/lib/mkdir.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,229 @@
+'use strict'
+// wrapper around mkdirp for tar's needs.
+
+// TODO: This should probably be a class, not functionally
+// passing around state in a gazillion args.
+
+const mkdirp = require('mkdirp')
+const fs = require('fs')
+const path = require('path')
+const chownr = require('chownr')
+const normPath = require('./normalize-windows-path.js')
+
+class SymlinkError extends Error {
+  constructor (symlink, path) {
+    super('Cannot extract through symbolic link')
+    this.path = path
+    this.symlink = symlink
+  }
+
+  get name () {
+    return 'SylinkError'
+  }
+}
+
+class CwdError extends Error {
+  constructor (path, code) {
+    super(code + ': Cannot cd into \'' + path + '\'')
+    this.path = path
+    this.code = code
+  }
+
+  get name () {
+    return 'CwdError'
+  }
+}
+
+const cGet = (cache, key) => cache.get(normPath(key))
+const cSet = (cache, key, val) => cache.set(normPath(key), val)
+
+const checkCwd = (dir, cb) => {
+  fs.stat(dir, (er, st) => {
+    if (er || !st.isDirectory()) {
+      er = new CwdError(dir, er && er.code || 'ENOTDIR')
+    }
+    cb(er)
+  })
+}
+
+module.exports = (dir, opt, cb) => {
+  dir = normPath(dir)
+
+  // if there's any overlap between mask and mode,
+  // then we'll need an explicit chmod
+  const umask = opt.umask
+  const mode = opt.mode | 0o0700
+  const needChmod = (mode & umask) !== 0
+
+  const uid = opt.uid
+  const gid = opt.gid
+  const doChown = typeof uid === 'number' &&
+    typeof gid === 'number' &&
+    (uid !== opt.processUid || gid !== opt.processGid)
+
+  const preserve = opt.preserve
+  const unlink = opt.unlink
+  const cache = opt.cache
+  const cwd = normPath(opt.cwd)
+
+  const done = (er, created) => {
+    if (er) {
+      cb(er)
+    } else {
+      cSet(cache, dir, true)
+      if (created && doChown) {
+        chownr(created, uid, gid, er => done(er))
+      } else if (needChmod) {
+        fs.chmod(dir, mode, cb)
+      } else {
+        cb()
+      }
+    }
+  }
+
+  if (cache && cGet(cache, dir) === true) {
+    return done()
+  }
+
+  if (dir === cwd) {
+    return checkCwd(dir, done)
+  }
+
+  if (preserve) {
+    return mkdirp(dir, { mode }).then(made => done(null, made), done)
+  }
+
+  const sub = normPath(path.relative(cwd, dir))
+  const parts = sub.split('/')
+  mkdir_(cwd, parts, mode, cache, unlink, cwd, null, done)
+}
+
+const mkdir_ = (base, parts, mode, cache, unlink, cwd, created, cb) => {
+  if (!parts.length) {
+    return cb(null, created)
+  }
+  const p = parts.shift()
+  const part = normPath(path.resolve(base + '/' + p))
+  if (cGet(cache, part)) {
+    return mkdir_(part, parts, mode, cache, unlink, cwd, created, cb)
+  }
+  fs.mkdir(part, mode, onmkdir(part, parts, mode, cache, unlink, cwd, created, cb))
+}
+
+const onmkdir = (part, parts, mode, cache, unlink, cwd, created, cb) => er => {
+  if (er) {
+    fs.lstat(part, (statEr, st) => {
+      if (statEr) {
+        statEr.path = statEr.path && normPath(statEr.path)
+        cb(statEr)
+      } else if (st.isDirectory()) {
+        mkdir_(part, parts, mode, cache, unlink, cwd, created, cb)
+      } else if (unlink) {
+        fs.unlink(part, er => {
+          if (er) {
+            return cb(er)
+          }
+          fs.mkdir(part, mode, onmkdir(part, parts, mode, cache, unlink, cwd, created, cb))
+        })
+      } else if (st.isSymbolicLink()) {
+        return cb(new SymlinkError(part, part + '/' + parts.join('/')))
+      } else {
+        cb(er)
+      }
+    })
+  } else {
+    created = created || part
+    mkdir_(part, parts, mode, cache, unlink, cwd, created, cb)
+  }
+}
+
+const checkCwdSync = dir => {
+  let ok = false
+  let code = 'ENOTDIR'
+  try {
+    ok = fs.statSync(dir).isDirectory()
+  } catch (er) {
+    code = er.code
+  } finally {
+    if (!ok) {
+      throw new CwdError(dir, code)
+    }
+  }
+}
+
+module.exports.sync = (dir, opt) => {
+  dir = normPath(dir)
+  // if there's any overlap between mask and mode,
+  // then we'll need an explicit chmod
+  const umask = opt.umask
+  const mode = opt.mode | 0o0700
+  const needChmod = (mode & umask) !== 0
+
+  const uid = opt.uid
+  const gid = opt.gid
+  const doChown = typeof uid === 'number' &&
+    typeof gid === 'number' &&
+    (uid !== opt.processUid || gid !== opt.processGid)
+
+  const preserve = opt.preserve
+  const unlink = opt.unlink
+  const cache = opt.cache
+  const cwd = normPath(opt.cwd)
+
+  const done = (created) => {
+    cSet(cache, dir, true)
+    if (created && doChown) {
+      chownr.sync(created, uid, gid)
+    }
+    if (needChmod) {
+      fs.chmodSync(dir, mode)
+    }
+  }
+
+  if (cache && cGet(cache, dir) === true) {
+    return done()
+  }
+
+  if (dir === cwd) {
+    checkCwdSync(cwd)
+    return done()
+  }
+
+  if (preserve) {
+    return done(mkdirp.sync(dir, mode))
+  }
+
+  const sub = normPath(path.relative(cwd, dir))
+  const parts = sub.split('/')
+  let created = null
+  for (let p = parts.shift(), part = cwd;
+    p && (part += '/' + p);
+    p = parts.shift()) {
+    part = normPath(path.resolve(part))
+    if (cGet(cache, part)) {
+      continue
+    }
+
+    try {
+      fs.mkdirSync(part, mode)
+      created = created || part
+      cSet(cache, part, true)
+    } catch (er) {
+      const st = fs.lstatSync(part)
+      if (st.isDirectory()) {
+        cSet(cache, part, true)
+        continue
+      } else if (unlink) {
+        fs.unlinkSync(part)
+        fs.mkdirSync(part, mode)
+        created = created || part
+        cSet(cache, part, true)
+        continue
+      } else if (st.isSymbolicLink()) {
+        return new SymlinkError(part, part + '/' + parts.join('/'))
+      }
+    }
+  }
+
+  return done(created)
+}