On Tue, Aug 05, 2014 at 09:36:09AM +0100, Nikhil Nair nnair-at-pobox.com 
|Sourceforge| wrote:
> First issue: I'm not sure what the -K flag to setup-x86_64.exe does (a la
> the instructions on the Cygwin Ports front page), but it seems to have the
> result that setup doesn't launch at all.  I tried:
> 
> 1.  cygstart -- path-to-setup.exe -K (from within Cygwin); nothing
> happened.  When I remove the -K flag, I get the user account control dialog
> box as usual, and when I click on yes (yes, I do want to allow the program
> to make changes to my computer), setup launches fine.
> 
> 2.  I tried creating a shortcut to setup-x86_64.exe, adding the -K flag to
> the target, and use that to launch it.  Same result: nothing, and removing
> the -K flag makes it operate as usual.

You seem to be missing the next argument to that command: the URI of the
Cygwin Ports GPG key.  The -K flag speficies that URI; you can see the
purpose of all the command line arguments by running `setup-<arch>.exe
--help` from a command line, or at 
https://cygwin.com/faq/faq.html#faq.setup.cli.

> So that's issue 1.  I tried proceeding without -K, but everything ground to
> a halt when setup.ini from ftp.cygwinports.org was rejected; setup
> complained of a corrupted mirror.  I'm not sure if that's something the -K
> flag was supposed to bypass...

Yes, that's what the -K flag is for.  Specifying the GPG key allows the
setup program to verify the packages provided by the mirror.  No GPG key
means the packages look invalid.

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