ssm

function Has-Instance
{
    $ssm_path = $Env:Programfiles + "\Amazon\SSM\sam-cli.exe"
    if(Test-Path -Path $ssm_path -PathType Leaf)
    {
        cd $Env:ProgramFiles\Amazon\SSM
        $output = .\ssm-cli.exe get-instance-information | ConvertFrom-Json
        if([bool] $output.psobject.properties.name -match "instance-id")
        {
            $managed_instance_id = $output.psobject.properties["instance-id"].value
            if($managed_instance_id.StartsWith("mi-"))
            {
                return 0
            }
        }
    }
    return 1
}

$has_instance = Has-Instance
if($has_instance -eq 1)
{
  echo "Instance Id already exists, do not re-run the activation."
  exit 0
}