[GSoC] migration

[Umesh Singla]

Hi

>       • A snapshot would be a list of install commands that created the
> current installed state.
> >       • Restoring a snapshot would deactivate the active ports and
> reproduce the install commands for the selected snapshot.
> >       • Migrate would amount to creating a new snapshot, uninstalling
> installed ports and reproducing the install commands for the last snapshot.
> > @Brad: Did you miss “uninstalling installed ports” in the second point
> above?
>
> No. I imagined being able to switch between snapshots with minimal
> building. Migration would uninstall because we are changing platforms.
>

I didn't look at the point with this perspective. But it sure is a great
idea.

Thanks,
Umesh
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