From 4df4f77bf6a7489be3f79ff2fc9e52270acc2178 Mon Sep 17 00:00:00 2001
From: Chris Roberts <code@chrisroberts.org>
Date: Mon, 8 May 2017 10:06:27 -0700
Subject: [PATCH] Match WSL installed Vagrant with Windows installed Vagrant

---
 lib/vagrant/errors.rb        |  4 ++++
 lib/vagrant/util/platform.rb | 19 +++++++++++++++++++
 templates/locales/en.yml     | 10 ++++++++++
 3 files changed, 33 insertions(+)

diff --git a/lib/vagrant/errors.rb b/lib/vagrant/errors.rb
index 6fb07803b..b822644ea 100644
--- a/lib/vagrant/errors.rb
+++ b/lib/vagrant/errors.rb
@@ -891,5 +891,9 @@ module Vagrant
     class VMPowerOffToPackage < VagrantError
       error_key(:power_off, "vagrant.actions.vm.export")
     end
+
+    class WSLVagrantVersionMismatch < VagrantError
+      error_key(:wsl_vagrant_version_mismatch)
+    end
   end
 end
diff --git a/lib/vagrant/util/platform.rb b/lib/vagrant/util/platform.rb
index 24b315987..4b744c3e7 100644
--- a/lib/vagrant/util/platform.rb
+++ b/lib/vagrant/util/platform.rb
@@ -293,6 +293,7 @@ module Vagrant
         # @param [Logger] logger Optional logger to display information
         def wsl_init(logger=nil)
           if wsl? && ENV["VAGRANT_WSL_ACCESS_WINDOWS_USER"]
+            wsl_validate_matching_vagrant_versions!
             shared_user = ENV["VAGRANT_WSL_ACCESS_WINDOWS_USER"]
             if logger
               logger.warn("Windows Subsystem for Linux detected. Allowing access to user: #{shared_user}")
@@ -310,6 +311,24 @@ module Vagrant
           end
         end
 
+        # Confirm Vagrant versions installed within the WSL and the Windows system
+        # are the same. Raise error if they do not match.
+        def wsl_validate_matching_vagrant_versions!
+          valid = false
+          result = Util::Subprocess.execute("vagrant.exe", "version")
+          if result.exit_code == 0
+            windows_version = result.stdout.match(/Installed Version: (?<version>.+$)/)
+            if windows_version
+              valid = windows_version[:version] == Vagrant::VERSION
+            end
+          end
+          if !valid
+            raise Vagrant::Errors::WSLVagrantVersionMismatch,
+              wsl_version: Vagrant::VERSION,
+              windows_version: windows_version ? windows_version[:version] : "unknown"
+          end
+        end
+
         # @private
         # Reset the cached values for platform. This is not considered a public
         # API and should only be used for testing.
diff --git a/templates/locales/en.yml b/templates/locales/en.yml
index 00ba09371..8c08135f9 100644
--- a/templates/locales/en.yml
+++ b/templates/locales/en.yml
@@ -1520,6 +1520,16 @@ en:
         VM must be running to open SSH connection. Run `vagrant up`
         to start the virtual machine.
       test_key: "test value"
+      wsl_vagrant_version_mismatch: |-
+        Vagrant cannot currently enable access to manage machines within the Windows
+        environment because the version of Vagrant installed on Windows does not
+        match this version of Vagrant running within the Windows Subsystem for Linux.
+        Please ensure both installation of Vagrant are the same. If you do not want
+        update your Vagrant installations you can disable Windows access by unsetting
+        the `VAGRANT_WSL_ACCESS_WINDOWS_USER` environment variable.
+
+          Windows Vagrant version: %{windows_version}
+          Windows Subsystem for Linux Vagrant version: %{wsl_version}
 
 #-------------------------------------------------------------------------------
 # Translations for config validation errors