[CMake] Make NSIS generator generate installer that requires admin or power user

[Mattias Helsing]

...and of course I forgot the patch. Here it is.
Mattias

On Wed, Feb 1, 2012 at 12:06 AM, Mattias Helsing <helsing72 at gmail.com> wrote:
> Hi,
>
> I'm a user of the NSIS generator of CPack to generate nice windows
> installers. Often lately I have embedded external installers with my
> installer and then run them as part of my installer. This is working
> really nice except for one thing; if you need to install drivers or
> services the entire installer will require admin or power user
> privileges. Thus I need to stop both the installer and the uninstaller
> from running early if the user running it doesn't have proper
> privileges. Until now I have manually post edited the generated
> project.nsi file to add this functionlity and regenerated the
> installer.
> Now I hope that someone else is embedding external installers with
> their installers and propose a new feature. It optionally adds an
> abort message and installer abort if one sets
> CPACK_NSIS_REQUIRE_POWERUSER prior to include(CPack).
> Attached patch is against cmake master. In CPack.cmake it sets
> CPACK_NSIS_REQUIRE_POWERUSER to "ON" if a user have defined or set
> CPACK_NSIS_REQUIRE_POWERUSER to anything. This is because the NSIS
> scripting language is assembler-like and I string compare (StrCmp) the
> value of said variable to "ON" to perform a relative jump. Not setting
> CPACK_NSIS_REQUIRE_POWERUSER will generate the same installer as
> NSIS.template.in has generated since cmake 2.6. Feedback welcome.
>
> cheers
> Mattias
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