Adding a user to a group and managing Home Directory

UserAdd.ps1

param (
  [parameter(Position=0)]
  [alias("user")][string]$userName,
  [alias("group")][string]$groupName=$null,
  [alias("home")][string]$homeDirectory=$null
)
# there are some much simpler ways to do this with the Active-Directory Module
# like Get-ADUser, Set-ADUser, etc but it is not installed on Win2008 (non-R2)
# and below so we want to prefer what works natively for all Windows machines

if ($userName -eq $null) { return "Error: Please pass in a User Name" }

$groups = @()
$currentHomeDirectory = $null

$adsi = [ADSI]"WinNT://$env:COMPUTERNAME"
# these do not return null
#$adsiUser = [ADSI]("WinNT://$env:COMPUTERNAME/$userName")
#$adsiGroup = [ADSI]("WinNT://$env:COMPUTERNAME/$groupName")

$adsiUser = $adsi.Children | ?{$_.SchemaClassName -eq 'user'} | ?{$_.Name.ToString().ToLower() -eq "$userName".ToLower()}
if ($adsiUser -eq $null) {
  # we are creating the user
  $newUser = $adsi.Children.Add("$userName","user")
  #$newUser.Invoke("Put", { "Description", "Test Group from .NET" });
  $newUser.CommitChanges()

  $adsiUser = $newUser
} else {
  $groups = $adsiUser.Groups() | %{$_.GetType().InvokeMember("Name", "GetProperty", $null, $_, $null)}
  $currentHomeDirectory = $adsiUser.HomeDirectory.Value
}

if ($groupName -ne $null) {
  # does the group exist?
  $adsiGroup = $adsi.Children | ?{$_.SchemaClassName -eq 'group'} | ?{$_.Name.ToString().ToLower() -eq "$groupName".ToLower()}
  if ($adsiGroup -eq $null) {
    # create the group
    $newGroup = $adsi.Children.Add("$groupName","group")
    $newGroup.CommitChanges()

    $adsiGroup = $newGroup
  }

  # is the user in the group?
  if (! ($groups -contains "$groupName")) {
    #put the user in the group
    $adsiGroup.PSBase.Invoke("Add",$adsiUser.PSBase.Path)
  }
}

# this may or may not be the correct thing to do because of HOMEDRIVE
if ($homeDirectory -ne $null) {
  # does the user have the home directory set properly?
  if ($currentHomeDirectory -ne $homeDirectory) {
	$adsiUser.HomeDirectory = "$homeDirectory"
	$adsiUser.CommitChanges()
  }
}

There is a very small issue with the $homeDirectory getting, sometimes folks will have a home already set without having that variable set (which is set to the default in the user profile) but there isn't really a nice way to get to that the way I went about it.

If you want to leave the default, you just don't pass it in

And hmmm, homedrive may or may not come into play here. I'm thinking about it way too much I know.