Functions/Test-WindowsFeature.ps1
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# Copyright 2012 Aaron Jensen # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Test-WindowsFeature { <# .SYNOPSIS Tests if an optional Windows component exists and, optionally, if it is installed. .DESCRIPTION Feature names are different across different versions of Windows. This function tests if a given feature exists. You can also test if a feature is installed by setting the `Installed` switch. Feature names are case-sensitive and are different between different versions of Windows. For a list, on Windows 2008, run `serveramanagercmd.exe -q`; on Windows 7, run `Get-WmiObject -Class Win32_OptionalFeature | Select-Object Name`. On Windows 8/2012, use `Get-WindowsFeature`. .LINK Get-WindowsFeature .LINK Install-WindowsFeature .LINK Uninstall-WindowsFeature .EXAMPLE Test-WindowsFeature -Name MSMQ-Server Tests if the MSMQ-Server feature exists on the current computer. .EXAMPLE Test-WindowsFeature -Name IIS-WebServer -Installed Tests if the IIS-WebServer features exists and is installed/enabled. #> [CmdletBinding(SupportsShouldProcess=$true)] param( [Parameter(Mandatory=$true)] [string] # The name of the feature to test. Feature names are case-sensitive and are different between different versions of Windows. For a list, on Windows 2008, run `serveramanagercmd.exe -q`; on Windows 7, run `Get-WmiObject -Class Win32_OptionalFeature | Select-Object Name`. On Windows 8/2012, use `Get-WindowsFeature`. $Name, [Switch] # Test if the service is installed in addition to if it exists. $Installed ) Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState if( -not (Get-Module -Name 'ServerManager') -and -not (Assert-WindowsFeatureFunctionsSupported) ) { return } $feature = Get-WindowsFeature -Name $Name if( $feature ) { if( $Installed ) { return $feature.Installed } return $true } else { return $false } } |