param(
  [Parameter(Mandatory = $true, Position = 0)]
  [string]$Url,

  [Parameter(Position = 1)]
  [string]$Output = "repo.zip"
)

$ErrorActionPreference = "Stop"
$WorkDir = ".tmp_git_mirror"

try {
  Write-Host "[1/3] Cloning mirror of $Url ..."
  git clone --mirror $Url $WorkDir

  Write-Host "[2/3] Creating $Output with maximum compression ..."
  Compress-Archive -Path "$WorkDir\*" -DestinationPath $Output -CompressionLevel Optimal -Force

  $Size = [math]::Round((Get-Item $Output).Length / 1MB, 2)
  Write-Host "[3/3] Done: $Output ($Size MB)"
}
finally {
  if (Test-Path $WorkDir) {
    Remove-Item -Recurse -Force $WorkDir
  }
}