Re: [GSoC] migration

[Joshua Root]

On 2017-8-11 21:14 , Umesh Singla wrote:
Hi
        And then again, I am sensing a confusion with the idea of
        snapshot with Josh, like when he says "remove ports when they
        are no longer referenced by any snapshot".


    What confusion exactly? A snapshot is simply a set of ports (by
    which I mean rows in the 'ports' table, with a unique combination of
    name,version,revision,variants). When nothing references a row any
    more, it needs to be deleted.


By 'ports', do you mean 'registry.ports' table? If yes, then I disagree. 
It's actually 'registry.snapshot_ports' table. A snapshot has nothing to 
do with the original registry "tables".

That was a suggested design; if you're already doing it differently then 
I guess you don't need a design. I disagree with the last sentence 
though, a snapshot can be viewed as precisely the state of the original 
tables at a previous time.

Also, we are not using version and revision. Even going by the literal 
meaning of a snapshot, it should not have a key or id linked to 
something that can change over time. It's simply the present state.

The row in the ports table would not change over time, it would simply 
persist until no longer needed. If we ever get the ability to install 
old versions then that information would come in handy.

Later, I am planning to keep information on the manual portgroups in the 
snapshot, if there are any.

What would this information be used for?

- Josh