Guard functions for powershell version and elevation level

Check-Elevation.ps1

# Only run if elevated as administrator
$identity = [Security.Principal.WindowsIdentity]::GetCurrent()
$admin = [Security.Principal.WindowsBuiltInRole]::Administrator
if (!([Security.Principal.WindowsPrincipal]$identity).IsInRole($admin)) {
    Write-Output 'We are not elevated, launching elevated powershell...'
    Start-Process -FilePath powershell.exe -Verb RunAs -ArgumentList $MyInvocation.MyCommand.Source
    Start-Sleep 10
    exit 0
}

Check-PSVersion.ps1

# Only run in PowerShell 7 or higher
if ($PSVersionTable.PSVersion.Major -lt 7) {
    Write-Output 'This script requires PowerShell 7 or later.'
    #TODO: Add logic for PS6 on Linux
    $pwsh = 'C:\Program Files\PowerShell\7\pwsh.exe'
    if (([IO.FileInfo]$pwsh).Exists) {
        $pwshCIM = Get-CimInstance -Class CIM_DataFile -Filter ('Name="{0:s}"' -f $pwsh.Replace('\', '\\'))
        if ($pwshCIM.Version -ge 7) {
            Write-Output 'PowerShell 7 detected. Reinvoking with PowerShell 7...'
            Start-Process -FilePath $pwsh -ArgumentList $MyInvocation.Line -WorkingDirectory $PWD
            Start-Sleep 10
            exit 0
        }
    } else {
        Write-Output 'PowerShell 7 not detected. Please try again using PowerShell 7.'
        Start-Sleep 10
        exit 1
    }
}