1 files changed, 20 insertions, 4 deletions
diff --git a/deps/npm/node_modules/read-package-json/read-json.js b/deps/npm/node_modules/read-package-json/read-json.js
index 969bcc030b..243af8e271 100644
--- a/deps/npm/node_modules/read-package-json/read-json.js
+++ b/deps/npm/node_modules/read-package-json/read-json.js
@@ -339,10 +339,26 @@ function githead_ (file, data, dir, head, cb) {
     data.gitHead = head.trim()
     return cb(null, data)
   }
-  var headFile = head.replace(/^ref: /, '').trim()
-  headFile = path.resolve(dir, '.git', headFile)
+  var headRef = head.replace(/^ref: /, '').trim()
+  var headFile = path.resolve(dir, '.git', headRef)
   fs.readFile(headFile, 'utf8', function (er, head) {
-    if (er || !head) return cb(null, data)
+    if (er || !head) {
+      var packFile = path.resolve(dir, '.git/packed-refs')
+      return fs.readFile(packFile, 'utf8', function (er, refs) {
+        if (er || !refs) {
+          return cb(null, data)
+        }
+        refs = refs.split('\n')
+        for (var i = 0; i < refs.length; i++) {
+          var match = refs[i].match(/^([0-9a-f]{40}) (.+)$/)
+          if (match && match[2].trim() === headRef) {
+            data.gitHead = match[1]
+            break
+          }
+        }
+        return cb(null, data)
+      })
+    }
     head = head.replace(/^ref: /, '').trim()
     data.gitHead = head
     return cb(null, data)
@@ -371,7 +387,7 @@ function checkBinReferences_ (file, data, warn, cb) {
     var relName = data.bin[key]
     try {
       var binPath = path.resolve(dirName, relName)
-      fs.exists(binPath, handleExists.bind(null, relName))
+      fs.stat(binPath, (err) => handleExists(relName, !err))
     } catch (error) {
       if (error.message === 'Arguments to path.resolve must be strings' || error.message.indexOf('Path must be a string') === 0) {
         warn('Bin filename for ' + key + ' is not a string: ' + util.inspect(relName))