1 files changed, 16 insertions, 4 deletions
diff --git a/deps/npm/lib/config/defaults.js b/deps/npm/lib/config/defaults.js
index e5744772e..a90d4c22b 100644
--- a/deps/npm/lib/config/defaults.js
+++ b/deps/npm/lib/config/defaults.js
@@ -196,6 +196,7 @@ Object.defineProperty(exports, "defaults", {get: function () {
     , spin: true
     , "strict-ssl": true
     , tag : "latest"
+    , "tag-version-prefix" : "v"
     , tmp : temp
     , unicode : true
     , "unsafe-perm" : process.platform === "win32"
@@ -308,15 +309,26 @@ exports.types =
   , userconfig : path
   , umask: Umask
   , version : Boolean
+  , "tag-version-prefix" : String
   , versions : Boolean
   , viewer: String
   , _exit : Boolean
   }
 
-function getLocalAddresses() {
-  Object.keys(os.networkInterfaces()).map(function (nic) {
-    return os.networkInterfaces()[nic].filter(function (addr) {
-      return addr.family === "IPv4"
+function getLocalAddresses () {
+  var interfaces
+  // #8094: some environments require elevated permissions to enumerate
+  // interfaces, and synchronously throw EPERM when run without
+  // elevated privileges
+  try {
+    interfaces = os.networkInterfaces()
+  } catch (e) {
+    interfaces = {}
+  }
+
+  return Object.keys(interfaces).map(function (nic) {
+    return interfaces[nic].filter(function (addr) {
+      return addr.family === 'IPv4'
     })
     .map(function (addr) {
       return addr.address