core: EINVAL is not a metadata URL

CHANGELOG.md

@@ -3,6 +3,7 @@
 BUG FIXES:
 
   - core: V1 Vagrantfiles can upgrade provisioners properly. [GH-3092]
+  - core: Rare EINVAL errors on box adding are gone. [GH-3094]
 
 ## 1.5.0 (March 10, 2014)
 

lib/vagrant/action/builtin/box_add.rb

@@ -450,6 +450,10 @@ module Vagrant
               return true
             rescue Errors::BoxMetadataMalformed
               return false
+            rescue Errno::EINVAL
+              # Actually not sure what causes this, but its always
+              # in a case that isn't true.
+              return false
             rescue Errno::ENOENT
               return false
             end