providers/hyperv: verify cmdlet is available [GH-3398]

CHANGELOG.md

@@ -17,6 +17,7 @@ BUG FIXES:
   - guests/fedora: Fix hostname setting. [GH-3382]
   - guests/fedora: Support predictable network interface names for
       public/private networks. [GH-3207]
+  - providers/hyperv: Check for PowerShell features. [GH-3398]
   - synced\_folders/smb: Only set the chmod properly by default on Windows
       if it isn't already set. [GH-3394]
   - synced\_folders/smb: Sharing folders with odd characters like parens

plugins/providers/hyperv/action.rb

@@ -107,6 +107,7 @@ module VagrantPlugins
 
       def self.action_up
         Vagrant::Action::Builder.new.tap do |b|
+          b.use CheckEnabled
           b.use HandleBox
           b.use ConfigValidate
           b.use Call, IsState, :not_created do |env1, b1|
@@ -163,6 +164,7 @@ module VagrantPlugins
 
       # The autoload farm
       action_root = Pathname.new(File.expand_path("../action", __FILE__))
+      autoload :CheckEnabled, action_root.join("check_enabled")
       autoload :DeleteVM, action_root.join("delete_vm")
       autoload :Import, action_root.join("import")
       autoload :IsWindows, action_root.join("is_windows")

plugins/providers/hyperv/action/check_enabled.rb

@@ -0,0 +1,23 @@
+require "fileutils"
+
+require "log4r"
+
+module VagrantPlugins
+  module HyperV
+    module Action
+      class CheckEnabled
+        def initialize(app, env)
+          @app    = app
+        end
+
+        def call(env)
+          env[:ui].output("Verifying Hyper-V is enabled...")
+          result = env[:machine].provider.driver.execute("check_hyperv.ps1", {})
+          raise Errors::PowerShellFeaturesDisabled if !result["result"]
+
+          @app.call(env)
+        end
+      end
+    end
+  end
+end

plugins/providers/hyperv/errors.rb

@@ -22,6 +22,10 @@ module VagrantPlugins
         error_key(:no_switches)
       end
 
+      class PowerShellFeaturesDisabled < HyperVError
+        error_key(:powershell_features_disabled)
+      end
+
       class PowerShellError < HyperVError
         error_key(:powershell_error)
       end

plugins/providers/hyperv/scripts/check_hyperv.ps1

@@ -0,0 +1,10 @@
+# Include the following modules
+$Dir = Split-Path $script:MyInvocation.MyCommand.Path
+. ([System.IO.Path]::Combine($Dir, "utils\write_messages.ps1"))
+
+$check = $(-Not (-Not (Get-Command "Get-VMSwitch" -errorAction SilentlyContinue)))
+$result = @{
+    result = $check
+}
+
+Write-Output-Message $(ConvertTo-Json $result)

templates/locales/providers_hyperv.yml

@@ -51,6 +51,10 @@ en:
 
         For more help, please see the documentation on the Vagrant website
         for Hyper-V.
+      powershell_features_disabled: |-
+        The Hyper-V cmdlets for PowerShell are not available! Vagrant
+        requires these to control Hyper-V. Please enable them in the
+        "Windows Features" control panel and try again.
       powershell_error: |-
         An error occurred while executing a PowerShell script. This error
         is shown below. Please read the error message and see if this is