[GSoC] migration

[Umesh Singla]

Hi

For testing it should be enough to just modify the registry.db locally
> as you need it. Once you reach a stable schema, you will have to add
> modifications to the registry schema at two places.
>
> 1) The initial database schema for new installations is defined here:
>
> https://github.com/macports/macports-base/blob/
> e3a0dc2ebde62a9c5feac6a1edee1708a95bb02a/src/cregistry/sql.c#L122-L131
>
> 2) The metadata table in registry.db has a row with key='version', where
> value holds the schema version. The code to update from one schema
> version to the next is here:
>
> https://github.com/macports/macports-base/blob/
> e3a0dc2ebde62a9c5feac6a1edee1708a95bb02a/src/cregistry/sql.c#L231-L240


Thanks Rainer for this. This is really useful. I had doubts on how often
cregistry/sql.c file gets updated or whether this is the one. The name
sql.c seems to be so OS core file. So, I can just add the new tables here?

Also, new tables means adding them in update_db() too, just like it is the
case with existing port or portgroup tables?

Forgive me for asking almost everything.


--
Umesh Singla
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