1 files changed, 51 insertions, 9 deletions
diff --git a/deps/npm/node_modules/write-file-atomic/index.js b/deps/npm/node_modules/write-file-atomic/index.js
index 797e571779..519aacad98 100644
--- a/deps/npm/node_modules/write-file-atomic/index.js
+++ b/deps/npm/node_modules/write-file-atomic/index.js
@@ -2,6 +2,7 @@
 var fs = require('graceful-fs')
 var chain = require('slide').chain
 var MurmurHash3 = require('imurmurhash')
+var extend = Object.assign || require('util')._extend
 
 function murmurhex () {
   var hash = new MurmurHash3()
@@ -20,22 +21,63 @@ module.exports = function writeFile (filename, data, options, callback) {
   }
   if (!options) options = {}
   var tmpfile = getTmpname(filename)
-  chain([
-    [fs, fs.writeFile, tmpfile, data, options],
-    options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid],
-    [fs, fs.rename, tmpfile, filename]
-  ], function (err) {
-    err ? fs.unlink(tmpfile, function () { callback(err) })
-      : callback()
-  })
+
+  if (options.mode && options.chmod) {
+    return thenWriteFile()
+  } else {
+    // Either mode or chown is not explicitly set
+    // Default behavior is to copy it from original file
+    return fs.stat(filename, function (err, stats) {
+      options = extend({}, options)
+      if (!err && stats && !options.mode) {
+        options.mode = stats.mode
+      }
+      if (!err && stats && !options.chown && process.getuid) {
+        options.chown = { uid: stats.uid, gid: stats.gid }
+      }
+      return thenWriteFile()
+    })
+  }
+
+  function thenWriteFile () {
+    chain([
+      [fs, fs.writeFile, tmpfile, data, options.encoding || 'utf8'],
+      options.mode && [fs, fs.chmod, tmpfile, options.mode],
+      options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid],
+      [fs, fs.rename, tmpfile, filename]
+    ], function (err) {
+      err ? fs.unlink(tmpfile, function () { callback(err) })
+        : callback()
+    })
+  }
 }
 
 module.exports.sync = function writeFileSync (filename, data, options) {
   if (!options) options = {}
   var tmpfile = getTmpname(filename)
+
   try {
-    fs.writeFileSync(tmpfile, data, options)
+    if (!options.mode || !options.chmod) {
+      // Either mode or chown is not explicitly set
+      // Default behavior is to copy it from original file
+      try {
+        var stats = fs.statSync(filename)
+
+        options = extend({}, options)
+        if (!options.mode) {
+          options.mode = stats.mode
+        }
+        if (!options.chown && process.getuid) {
+          options.chown = { uid: stats.uid, gid: stats.gid }
+        }
+      } catch (ex) {
+        // ignore stat errors
+      }
+    }
+
+    fs.writeFileSync(tmpfile, data, options.encoding || 'utf8')
     if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid)
+    if (options.mode) fs.chmodSync(tmpfile, options.mode)
     fs.renameSync(tmpfile, filename)
   } catch (err) {
     try { fs.unlinkSync(tmpfile) } catch (e) {}