Windows 2008r2 Elevated Provisioning Example

win2008r2-packer.json

{
  "builders": [{
    "type": "virtualbox-windows-ovf",
    "name":"win2008updates",
    "source_path": "/Users/mfellows/Downloads/packer-output-updates/virtualbox-win-2008-base.ovf",
    "headless": false,
    "boot_wait": "1m",
    "winrm_username": "vagrant",
    "winrm_password": "vagrant",
    "winrm_wait_timeout": "5m",
    "guest_additions_mode": "disable",
    "shutdown_timeout": "2h",
    "shutdown_command": "shutdown /s /t 10 /f /d p:4:1 /c \"Packer Shutdown\"",
    "vboxmanage": [
      ["modifyvm", "{{.Name}}", "--memory", "2048"],
      ["modifyvm", "{{.Name}}", "--cpus", "1"]
    ]
  }],
  "provisioners": [
    {
      "type": "powershell",
      "elevated_user": "vagrant",
      "elevated_password": "vagrant",
	  "environment_vars":[
       "foo=bar",
       "bat=bat"
      ],
      "inline": [
          "echo $env:foo > c:\\foo.txt",
          "echo $env:foo > ~/foo.txt",
		  "echo 'should have output foo before'",
          "echo $env:bat > bat.txt",
          "echo $env:bat > ~/bat.txt",
		  "echo 'should have output bat before'"
      ]
	},
    {
      "type": "powershell",
      "elevated_user": "vagrant",
      "elevated_password": "vagrant",
      "inline": [
		"$wc = New-Object System.Net.WebClient; $wc.DownloadFile(\"http://download.microsoft.com/download/3/D/6/3D61D262-8549-4769-A660-230B67E15B25/Windows6.1-KB2819745-x64-MultiPkg.msu\", \"c:\\wmf4.msu\")",
		"c:\\wmf4.msu /quiet"
      ]
	},
	{
		"type":"restart-windows"
	},
    {
      "type": "powershell",
      "elevated_user": "vagrant",
      "elevated_password": "vagrant",
      "inline": [
          "iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))"
      ]
	},
	{
		"type":"restart-windows"
	},
    {
      "type": "powershell",
      "elevated_user": "vagrant",
      "elevated_password": "vagrant",
	  "environment_vars":[
       "foo=bar",
       "bat=bat"
      ],
      "inline": [
          "choco install netfx-4.5.2-devpack"
      ]
	}
  ]
}

winrm-setup.ps1

cmd.exe /c winrm quickconfig -q
cmd.exe /c winrm quickconfig '-transport:http'
cmd.exe /c winrm set "winrm/config" '@{MaxTimeoutms="1800000"}'
cmd.exe /c winrm set "winrm/config/winrs" '@{MaxMemoryPerShellMB="1024"}'
cmd.exe /c winrm set "winrm/config/service" '@{AllowUnencrypted="true"}'
cmd.exe /c winrm set "winrm/config/client" '@{AllowUnencrypted="true"}'
cmd.exe /c winrm set "winrm/config/service/auth" '@{Basic="true"}'
cmd.exe /c winrm set "winrm/config/client/auth" '@{Basic="true"}'
cmd.exe /c winrm set "winrm/config/service/auth" '@{CredSSP="true"}'
cmd.exe /c winrm set "winrm/config/listener?Address=*+Transport=HTTP" '@{Port="5985"}'
cmd.exe /c netsh advfirewall firewall set rule group="remote administration" new enable=yes
cmd.exe /c netsh firewall add portopening TCP 5985 "Port 5985"
cmd.exe /c net stop winrm
cmd.exe /c sc config winrm start= auto
cmd.exe /c net start winrm

1. Ensure the machine has all updates applied
2. Prepare your machine with the winrm-setup (probably in Autounattend.xml file) and then run Packer (with Packer Windows Plugins installed).
3. This will upgrade WMF to 4 which means you can install chocolatey from the CLI

The goal is to install .NET Devpack 4.5.2 using an elevated scheduled task.