From ca81f9d6cbcc10ed226dd88d100206d5e39a14de Mon Sep 17 00:00:00 2001
From: Chris Roberts <croberts@hashicorp.com>
Date: Wed, 24 Oct 2018 17:05:20 -0700
Subject: [PATCH] Prevent exception from raising on hyper-v check

---
 lib/vagrant/util/platform.rb            | 17 +++++++++++++++--
 test/unit/vagrant/util/platform_test.rb |  7 +++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/lib/vagrant/util/platform.rb b/lib/vagrant/util/platform.rb
index b695546fe..891623011 100644
--- a/lib/vagrant/util/platform.rb
+++ b/lib/vagrant/util/platform.rb
@@ -13,6 +13,14 @@ module Vagrant
     # This class just contains some platform checking code.
     class Platform
       class << self
+
+        def logger
+          if !defined?(@_logger)
+            @_logger = Log4r::Logger.new("vagrant::util::platform")
+          end
+          @_logger
+        end
+
         def cygwin?
           if !defined?(@_cygwin)
             @_cygwin = ENV["VAGRANT_DETECTED_OS"].to_s.downcase.include?("cygwin") ||
@@ -134,8 +142,13 @@ module Vagrant
           @_windows_hyperv_enabled = -> {
             ["Get-WindowsOptionalFeature", "Get-WindowsFeature"].each do |cmd_name|
               ps_cmd = "$(#{cmd_name} -FeatureName Microsoft-Hyper-V-Hypervisor).State"
-              output = Vagrant::Util::PowerShell.execute_cmd(ps_cmd)
-              return true if output == "Enabled"
+              begin
+                output = Vagrant::Util::PowerShell.execute_cmd(ps_cmd)
+                return true if output == "Enabled"
+              rescue Errors::PowerShellInvalidVersion
+                logger.warn("Invalid PowerShell version detected during Hyper-V enable check")
+                return false
+              end
             end
             return false
           }.call
diff --git a/test/unit/vagrant/util/platform_test.rb b/test/unit/vagrant/util/platform_test.rb
index 82721b0e1..c4aaa32a5 100644
--- a/test/unit/vagrant/util/platform_test.rb
+++ b/test/unit/vagrant/util/platform_test.rb
@@ -262,6 +262,13 @@ describe Vagrant::Util::Platform do
 
       expect(Vagrant::Util::Platform.windows_hyperv_enabled?).to be_falsey
     end
+
+    it "should return false if PowerShell cannot be validated" do
+      allow_any_instance_of(Vagrant::Errors::PowerShellInvalidVersion).to receive(:translate_error)
+      allow(Vagrant::Util::PowerShell).to receive(:execute_cmd).and_raise(Vagrant::Errors::PowerShellInvalidVersion)
+
+      expect(Vagrant::Util::Platform.windows_hyperv_enabled?).to be_falsey
+    end
   end
 
   context "within the WSL" do