title: Install Cygwin SSH during CloudFormation on Windows EC2
body: <p>I provision a Windows EC2 with CloudFormation and I'd like to install Cygwin SSH on it. Cygwin is scriptable according to <a href="https://stackoverflow.com/questions/745275/can-i-script-a-cygwin-install-to-include-certain-packages/7366200#7366200">Can I script a Cygwin install to include certain packages?</a>. I tried with <code>setup-x86_64.exe --quiet-mode --packages ssh</code>, but I still got a dialog to choose the mirror URL.</p>
  
  <p>What would be the correct command line?</p>