Powershell – Run powershell script as local script if ComputerName is localhost or ‘.’

powershellpowershell-remoting

I have this script that should be able to run on both remote and localhost. It accepts -ComputerName as parameter with '.' (localhost) as default.

Currently I am testing how to validate a new remote session and wrote a little cmdlet for it. Problem is, if I run this script with '.' or localhost as the ComputerName the script tries to connect to a new remote session on my computer. That will not work as I do not have PSRemoting enabled.

This is my test script: 

Function Test-PsRemoting {
[CmdletBinding()]
param(
    $ComputerName = ".",
    $Credentials    
)

$ErrorActionPreference = "Stop"

Test-Connection -ComputerName $ComputerName -Count 1 | 
    Format-List -Property PSComputerName,Address,IPV4Address,IPV6Address

Test-WSMan $ComputerName

$session = New-PSSession -ComputerName $ComputerName -Credential $Credentials
Invoke-Command -ComputerName $computername { 1 }
}

All of the commands, Test-WSMan, New-PSSession and Invoke-Command will fail as they assume I want to make a remote connection

Is it possible to let Powershell run the commands in the local session if $ComputerName is '.' or localhost or do I have to handle this myself in an if/else clause ?

The script is meant to run both local and on remote machines and I do not want PSRemoting enabled to be a requirement for running the script locally

Best Answer

AFAIK there is no $localsession-variable. You could use if-tests:

Function Test-PsRemoting {
    [CmdletBinding()]
    param(
        $ComputerName = ".",
        $Credentials    
    )

    $ErrorActionPreference = "Stop"

    $remote = $ComputerName -notmatch '\.|localhost'
    $sc = { 1 }

    #If remote computer, test connection create sessions
    if($remote) {
        Test-Connection -ComputerName $ComputerName -Count 1 | 
            Format-List -Property PSComputerName,Address,IPV4Address,IPV6Address

        Test-WSMan $ComputerName

        $session = New-PSSession -ComputerName $ComputerName -Credential $Credentials
    }

    if($remote) {
        #If remote computer
        Invoke-Command -ComputerName $computername -ScriptBlock $sc
    } else { 
        #Localhost
        Invoke-Command -ScriptBlock $sc
    }

}
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