providrs/hyperv: ask for the vswitch to use

plugins/providers/hyperv/action/import.rb

@@ -40,6 +40,29 @@ module VagrantPlugins
           end
 
           env[:ui].output("Importing a Hyper-V instance")
+
+          switches = env[:machine].provider.driver.execute("get_switches.ps1", {})
+          raise Errors::NoSwitches if switches.empty?
+
+          switch = switches[0]["Name"]
+          if switches.length > 1
+            env[:ui].detail(I18n.t("vagrant_hyperv.choose_switch") + "\n ")
+            switches.each_index do |i|
+              switch = switches[i]
+              env[:ui].detail("#{i+1}) #{switch["Name"]}")
+            end
+            env[:ui].detail(" ")
+
+            switch = nil
+            while !switch
+              switch = env[:ui].ask("What switch would you like to use? ")
+              next if !switch
+              switch = switch.to_i - 1
+              switch = nil if switch < 0 || switch >= switches.length
+            end
+            switch = switches[switch]["Name"]
+          end
+
           env[:ui].detail("Cloning virtual hard drive...")
           source_path = vhdx_path.to_s
           dest_path   = env[:machine].data_dir.join("disk.vhdx").to_s
@@ -52,6 +75,7 @@ module VagrantPlugins
             vm_xml_config:  config_path.to_s.gsub("/", "\\"),
             vhdx_path:      vhdx_path.to_s.gsub("/", "\\")
           }
+          options[:switchname] = switch if switch
 
           env[:ui].detail("Creating and registering the VM...")
           server = env[:machine].provider.driver.execute(

plugins/providers/hyperv/errors.rb

@@ -18,6 +18,10 @@ module VagrantPlugins
         error_key(:ip_addr_timeout)
       end
 
+      class NoSwitches < HyperVError
+        error_key(:no_switches)
+      end
+
       class PowerShellError < HyperVError
         error_key(:powershell_error)
       end

plugins/providers/hyperv/scripts/get_switches.ps1

@@ -3,6 +3,10 @@
 #   0 - Private
 #   1 - Internal
 #
+# Include the following modules
+$Dir = Split-Path $script:MyInvocation.MyCommand.Path
+. ([System.IO.Path]::Combine($Dir, "utils\write_messages.ps1"))
+
 $Switches = @(Get-VMSwitch `
     | Select-Object Name,SwitchType,NetAdapterInterfaceDescription)
-Write-Output $(ConvertTo-JSON $Switches)
+Write-Output-Message $(ConvertTo-JSON $Switches)

templates/locales/providers_hyperv.yml

@@ -1,5 +1,9 @@
 en:
   vagrant_hyperv:
+    choose_switch: |-
+      Please choose a switch to attach to your Hyper-V instance.
+      If none of these are appropriate, please open the Hyper-V manager
+      to create a new virtual switch.
     message_already_running: |-
       Hyper-V instance already running.
     message_not_created: |-
@@ -37,6 +41,16 @@ en:
         machine doesn't have the latest Hyper-V integration drivers. Please
         research for your operating system how to install these in order
         for the VM to properly communicate its IP address to Hyper-V.
+      no_switches: |-
+        There are no virtual switches created for Hyper-V! Please open
+        the Hyper-V Manager, go to the "Virtual Switch Manager", and create
+        at least one virtual switch.
+
+        A virtual switch is required for Vagrant to create a Hyper-V
+        machine that is connected to a network so it can access it.
+
+        For more help, please see the documentation on the Vagrant website
+        for Hyper-V.
       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