PowerShell script to do a full MSYS2 upgrade

msys2_full_upgrade.ps1

$erroractionpreference = 'stop'

if (-not (new-object security.principal.windowsprincipal(
            [security.principal.windowsidentity]::getcurrent()
        )).isinrole([security.principal.windowsbuiltinrole]::administrator)) {

    write-error "Must be elevated."
}

$bash = resolve-path /tools/msys64/usr/bin/bash.exe

function bash_cmd {
    $cmd = ($args | %{ "'$_'" }) -join " "

    &$bash -l -c $cmd
}

do {
    bash_cmd pacman --noconfirm -Syuu --overwrite '*'
    taskkill /f /FI 'MODULES eq msys-2.0.dll'
} while (bash_cmd pacman -Qu)