InstallPuppetFromMSI.ps1

$puppetVersion = '3.8.1'
$MsiUrl = "https://downloads.puppetlabs.com/windows/puppet-$puppetVersion.msi"
$MsiUrlx64 = "https://downloads.puppetlabs.com/windows/puppet-$puppetVersion-x64.msi"
$PuppetInstallerPath = 'c:\vagrantshared\resources\installers'
$PuppetInstallerFile = 'puppet-agent.msi'
if ([System.IntPtr]::Size -eq 8) {
  Write-Host "Going Puppet 64-bit."
  $MsiUrl = $MsiUrlx64
  $PuppetInstallerFile = 'puppet-agent-x64.msi'
}
$PuppetInstaller = Join-Path $PuppetInstallerPath $PuppetInstallerFile

$PuppetInstalled = $false
try {
  $ErrorActionPreference = "Stop";
  Get-Command puppet | Out-Null
  $PuppetInstalled = $true
  $PuppetVersion=&puppet "--version"
  Write-Host "Puppet $PuppetVersion is installed. This process does not ensure the exact version or at least version specified, but only that puppet is installed. Exiting..."
  Exit 0
} catch {
  Write-Host "Puppet is not installed, continuing..."
}

if (!($PuppetInstalled)) {
  $currentPrincipal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
  if (! ($currentPrincipal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator))) {
    Write-Host -ForegroundColor Red "You must run this script as an administrator."
    Exit 1
  }

  if (!(Test-Path $PuppetInstallerPath)) {
    Write-Host "Creating folder `'$PuppetInstallerPath`'"
    $null = New-Item -Path "$PuppetInstallerPath" -ItemType Directory
  }

  if (!(Test-Path $PuppetInstaller)) {
    Write-Host "Downloading `'$MsiUrl`' to `'$PuppetInstaller`'"
    (New-Object Net.WebClient).DownloadFile("$MsiUrl","$PuppetInstaller")
  }


  # Install it - msiexec will download from the url
  $install_args = @("/qn", "/norestart","/i", "$PuppetInstaller")
  Write-Host "Installing Puppet. Running msiexec.exe $install_args"
  $process = Start-Process -FilePath msiexec.exe -ArgumentList $install_args -Wait -PassThru
  if ($process.ExitCode -ne 0) {
    Write-Host "Installer failed."
    Exit 1
  }

  Write-Host "Notifing processes of PATH Change"
  # Notifies other processes that the global environment block has changed. 
  # This lets other processes pick changes to ENV: without having to reboot or logoff/logon. 
  # A non-zero result from SendMessageTimeout indicates success.
  if (-not ("win32.nativemethods" -as [type])) {
    # import sendmessagetimeout from win32
    add-type -Namespace Win32 -Name NativeMethods -MemberDefinition @"
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessageTimeout(
    IntPtr hWnd, uint Msg, UIntPtr wParam, string lParam,
    uint fuFlags, uint uTimeout, out UIntPtr lpdwResult);
"@
  }

  $HWND_BROADCAST = [intptr]0xffff;
  $WM_SETTINGCHANGE = 0x1a;
  $result = [uintptr]::zero

  # notify all windows of environment block change
  [win32.nativemethods]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE,  [uintptr]::Zero, "Environment", 2, 5000, [ref]$result);

  Write-Host "Puppet successfully installed."
}