DSCResources/MSFT_xVHD/MSFT_xVHD.psm1
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function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [parameter(Mandatory)] [String]$Name, [parameter(Mandatory)] [String]$Path, # Virtual disk format - Vhd or Vhdx [ValidateSet("Vhd","Vhdx")] [String]$Generation = "Vhd" ) # Check if Hyper-V module is present for Hyper-V cmdlets if(!(Get-Module -ListAvailable -Name Hyper-V)) { Throw "Please ensure that Hyper-V role is installed with its PowerShell module" } # Construct the full path for the vhdFile $vhdName = GetNameWithExtension -Name $Name -Generation $Generation $vhdFilePath = Join-Path -Path $Path -ChildPath $vhdName Write-Debug -Message "Vhd full path is $vhdFilePath" $vhd = Get-VHD -Path $vhdFilePath -ErrorAction SilentlyContinue @{ Name = $Name Path = $Path ParentPath = $vhd.ParentPath Generation = $vhd.VhdFormat Ensure = if($vhd){"Present"}else{"Absent"} ID = $vhd.DiskIdentifier Type = $vhd.VhdType FileSizeBytes = $vhd.FileSize MaximumSizeBytes = $vhd.Size IsAttached = $vhd.Attached } } function Set-TargetResource { [CmdletBinding()] param ( # Name of the VHD File [parameter(Mandatory)] [String]$Name, # Folder where the VHD will be created [parameter(Mandatory)] [String]$Path, # Parent VHD file path, for differencing disk [String]$ParentPath, # Size of Vhd to be created [Uint64]$MaximumSizeBytes, # Virtual disk format - Vhd or Vhdx [ValidateSet("Vhd","Vhdx")] [String]$Generation = "Vhd", # Should the VHD be created or deleted [ValidateSet("Present","Absent")] [String]$Ensure = "Present" ) # Check if Hyper-V module is present for Hyper-V cmdlets if(!(Get-Module -ListAvailable -Name Hyper-V)) { Throw "Please ensure that Hyper-V role is installed with its PowerShell module" } # Construct the full path for the vhdFile $vhdName = GetNameWithExtension -Name $Name -Generation $Generation $vhdFilePath = Join-Path -Path $Path -ChildPath $vhdName Write-Debug -Message "Vhd full path is $vhdFilePath" Write-Verbose -Message "Checking if $vhdFilePath is $Ensure ..." # If vhd should be absent, delete it if($Ensure -eq "Absent") { if (Test-Path $vhdFilePath) { Write-Verbose -Message "$vhdFilePath is not $Ensure" Remove-Item -Path $vhdFilePath -Force -ErrorAction Stop } Write-Verbose -Message "$vhdFilePath is $Ensure" } else { # Check if the Vhd is present try { $vhd = Get-VHD -Path $vhdFilePath -ErrorAction Stop # If this is a differencing disk, check the parent path if($ParentPath) { Write-Verbose -Message "Checking if $vhdFilePath parent path is $ParentPath ..." # If the parent path is not set correct, fix it if($vhd.ParentPath -ne $ParentPath) { Write-Verbose -Message "$vhdFilePath parent path is not $ParentPath." Set-VHD -Path $vhdFilePath -ParentPath $ParentPath Write-Verbose -Message "$vhdFilePath parent path is now $ParentPath." } else { Write-Verbose -Message "$vhdFilePath is $Ensure and parent path is set to $ParentPath." } } # This is a fixed disk, check the size else { Write-Verbose -Message "Checking if $vhdFilePath size is $MaximumSizeBytes ..." # If the size is not correct, fix it if($vhd.Size -ne $MaximumSizeBytes) { Write-Verbose -Message "$vhdFilePath size is not $MaximumSizeBytes." Resize-VHD -Path $vhdFilePath -SizeBytes $MaximumSizeBytes Write-Verbose -Message "$vhdFilePath size is now $MaximumSizeBytes." } else { Write-Verbose -Message "$vhdFilePath is $Ensure and size is $MaximumSizeBytes." } } } # Vhd file is not present catch [System.Management.Automation.ActionPreferenceStopException] { Write-Verbose -Message "$vhdFilePath is not $Ensure" if($ParentPath) { $null = New-VHD -Path $vhdFilePath -ParentPath $ParentPath } else { $null = New-VHD -Path $vhdFilePath -SizeBytes $MaximumSizeBytes } Write-Verbose -Message "$vhdFilePath is now $Ensure" } } } function Test-TargetResource { [CmdletBinding()] [OutputType([System.Boolean])] param ( # Name of the VHD File [parameter(Mandatory)] [String]$Name, # Folder where the VHD will be created [parameter(Mandatory)] [String]$Path, # Parent VHD file path, for differencing disk [String]$ParentPath, # Size of Vhd to be created [Uint64]$MaximumSizeBytes, # Virtual disk format - Vhd or Vhdx [ValidateSet("Vhd","Vhdx")] [String]$Generation = "Vhd", # Should the VHD be created or deleted [ValidateSet("Present","Absent")] [String]$Ensure = "Present" ) #region input validation # Check if Hyper-V module is present for Hyper-V cmdlets if(!(Get-Module -ListAvailable -Name Hyper-V)) { Throw "Please ensure that Hyper-V role is installed with its PowerShell module" } if(! ($ParentPath -or $MaximumSizeBytes)) { Throw "Either specify ParentPath or MaximumSizeBytes property." } if($ParentPath) { # Ensure only one value is specified - differencing disk or new disk if($MaximumSizeBytes) { Throw "Cannot specify both ParentPath and MaximumSizeBytes. Specify only one and try again." } if(! (Test-Path -Path $ParentPath)) { Throw "$ParentPath does not exists" } # Check if the generation matches parenting disk if($Generation -and ($ParentPath.Split('.')[-1] -ne $Generation)) { Throw "Generation $geneartion should match ParentPath extension $($ParentPath.Split('.')[-1])" } } if(!(Test-Path -Path $Path)) { Throw "$Path does not exists" } # Construct the full path for the vhdFile $vhdName = GetNameWithExtension -Name $Name -Generation $Generation $vhdFilePath = Join-Path -Path $Path -ChildPath $vhdName Write-Debug -Message "Vhd full path is $vhdFilePath" # Add the logic here and at the end return either $true or $false. $result = Test-VHD -Path $vhdFilePath -ErrorAction SilentlyContinue Write-Verbose -Message "Vhd $vhdFilePath is present:$result and Ensure is $Ensure" return ($result -and ($Ensure -eq "Present")) } # Appends the generation to the name provided if it is not part of the name already. function GetNameWithExtension { param( # Name of the VHD File [parameter(Mandatory)] [String]$Name, [parameter(Mandatory)] [String]$Generation ='Vhd' ) # If the name ends with vhd or vhdx don't append the generation to the vhdname. if ($Name -like '*.vhd' -or $Name -like '*.vhdx') { $extension = $Name.Split('.')[-1] if ($Generation -ne $extension) { throw "the extension $extension on the name does match the generation $Generation" } else { Write-Debug -Message "Vhd full name is $vhdName" $vhdName = $Name } } else { # Append generation to the name $vhdName = "$Name.$Generation" Write-Debug -Message "Vhd full name is $vhdName" } return $vhdName } Export-ModuleMember -Function *-TargetResource |