Detect OS upgrades and refer users to Migration

[Daniel J. Luke]

On Nov 6, 2013, at 5:06 AM, Rainer Müller <raimue at macports.org> wrote:
> On 2013-11-05 02:06, Ryan Schmidt wrote:
>> Is there a way that we could detect that the OS has been upgraded so that we could refer users to the Migration wiki page? I don’t think we keep track of the last-used OS X version anywhere, but maybe it’s as simple as checking if any installed port was installed for a different OS version than the current one (e.g. we’re now on darwin 13 but there are ports installed with darwin 12).
> 
> As our base system is already targeting a specific OS release, we should
> just store the platform it was built for in *_autoconf.tcl and issue an
> error if that does not match on launch.

That sounds good to me.
--
Daniel J. Luke                                                                   
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