provision-wsl2.ps1

# see https://ubuntu.com/blog/ubuntu-on-wsl-2-is-generally-available
# see https://aka.ms/wsl2kernel

# only install WSL2 in Windows 2004+ Client/Workstation.
# see https://github.com/microsoft/WSL/issues/6301#issuecomment-858816891
$windowsCurrentVersionKey = Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion'
$windowsEdition = $windowsCurrentVersionKey.EditionID
if ($windowsEdition -like 'Server*') {
    Write-Host "WARN: WSL was skipped because it only works in the Client/Workstation Windows edition. The current Windows edition is $windowsEdition."
    Exit 0
}
$windowsBuildNumber = $windowsCurrentVersionKey.CurrentBuildNumber
if ($windowsBuildNumber -lt 19041) {
    Write-Host "WARN: WSL2 was skipped because you need Windows Build 19041+ (aka Windows 10 2004) and you are using Windows Build $windowsBuildNumber."
    Exit 0
}

Write-Host 'Downloading the WSL2 kernel...'
$archiveUrl = 'https://wslstorestorage.blob.core.windows.net/wslblob/wsl_update_x64.msi'
$archiveName = Split-Path -Leaf $archiveUrl
$archivePath = "$env:TEMP\$archiveName"
(New-Object System.Net.WebClient).DownloadFile($archiveUrl, $archivePath)

Write-Host 'Installing the WSL2 kernel...'
msiexec /i $archivePath `
    /qn `
    /L*v "$archivePath.log" `
    | Out-String -Stream
if ($LASTEXITCODE) {
    throw "$archiveName installation failed with exit code $LASTEXITCODE. See $archivePath.log."
}
Remove-Item $archivePath

Write-Host 'Setting default WSL version to 2...'
wsl.exe --set-default-version 2