[GSoC] migration

[db]

On 27 Jul 2017, at 00:35, Umesh Singla <umeshksingla at macports.org> wrote:
> Hi Josh
>> We don't have version dependencies so no, this sort of check is not possible a priori. Breakage will be caught by rev-upgrade after the fact in many cases (and if it is set to rebuild automatically, it may well revert you back to the newer version).

>> Also note that we can't actually revert to an older version of a port if it has been uninstalled.

Does it mean that snapshot just outputs a list of ports, deps and variants without their versions, so if I postpone the restore long enough, it'll reinstall current versions of all of them? I'm thinking here about the possibility of reinstalling a system or migrating between machines with same operating system and ending up with some broken ports.