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0.1.0

Ubuntu.ps1

 
# https://www.lucd.info/2019/12/06/cloud-init-part-1-the-basics/
# https://gist.github.com/leogallego/a614c61457ed22cb1d960b32de4a1b01
function Get-OVF {


} 

function Get-Ubuntu {
    param (
        [string] $Path,
        [string] $File,
        [bool] $Update
    )

    $cacheDir = Get-BoxPath -Path "cache"
    $imageFile = Join-Path $cacheDir $File

    # If not update and image file exists we have it

    if (-Not($Update)) {
        if (Test-Path $imageFile -PathType Leaf) {
            return $imageFile
        }
    }

    $ProgressPreference = "SilentlyContinue"

    $url = (("https://cloud-images.ubuntu.com", $Path, $File) -join "/")
    Write-Verbose $url

    # If update and we have a file, check if there's one newer

    if (Test-Path $imageFile -PathType Leaf) {
        Write-Host "Checking new image '$File' ..." -NoNewline
        $response = Invoke-WebRequest $url -UseBasicParsing -Method Head
        Write-Host -ForegroundColor Green " Done."

        $lastModified = Get-Date -Date ($response.Headers["Last-Modified"])
        $fileTime = (Get-ChildItem $imageFile | Select-Object CreationTime).CreationTime

        if ($fileTime -gt $lastModified) {
            return $imageFile
        }
        
    }
    

    # Download file

    Write-Host "Checking new image size '$File' ..." -NoNewline
    $response = Invoke-WebRequest $url -UseBasicParsing -Method Head
    Write-Host -ForegroundColor Green " Done."
    $downloadSize = [int]$response.Headers["Content-Length"]


    $tmpFile = Join-Path $cacheDir "${File}.tmp"
    if (Test-Path $tmpFile -PathType Leaf) {
        Remove-Item $tmpFile
    }
    
    Write-Host "Downloading new image '$File' ($([int]($downloadSize / 1024 / 1024)) MB)..." -NoNewline
    Invoke-WebRequest $url -OutFile $tmpFile
    Write-Host -ForegroundColor Green " Done."

    # Check file hash
    $hashPath = (("https://cloud-images.ubuntu.com", $Path, "SHA256SUMS") -join "/")
    Write-Host "Checking file hash for '$File' ..." -NoNewline
    $hashSums = [System.Text.Encoding]::UTF8.GetString((Invoke-WebRequest $hashPath -UseBasicParsing).Content)
    $fileHash = Get-FileHash $tmpFile -Algorithm SHA256
    if (($hashSums | Select-String -pattern $fileHash.Hash -SimpleMatch).Count -eq 0) { 
        Remove-Item $tmpFile
        Write-Host -ForegroundColor Red "File hash check failed" 
        exit
    }
    Write-Host -ForegroundColor Green " Done."

    $ProgressPreference = "Continue"

    # Replace file

    if (Test-Path $imageFile -PathType Leaf) {
        Remove-Item $imageFile
    }

    Move-Item $tmpFile $imageFile

    return $imageFile
}