[bug#39258] Faster guix search using an sqlite cache

[Arun Isaac]

> Hum? weird...
> Is it possible that a module is loaded when Guile repl is used and not
> with Guix pull?

It could be. But I don't know how to confirm this theory.

> What about "guix repl"?

I just tried 'guix repl'. It worked correctly, just like guile repl.

>> If I try to populate the database with each package record being
>> inserted in its own transaction, at least some of the insertions
>
> You mean 'commit' the database after each insertion, right?

Yes, that is what I mean.

>> work. But the journal file still lingers. My unverified guess is that
>> everything except the last transaction was successful.
>
> And this does not happen with the repl, right?

No, this does not happen with the repl.

>> Any ideas what's going on?
>
> I have no idea.
> Weird.

Do you know of any way sqlite can create an error log to report what's
going on? That might really help debug this issue.

> What about adding 'last-insert-row-id' from 'guix/store/database.scm'?
> I mean without really understanding and just grepping
> 'sqlite-finalize' spots that 'last-insert-row-id' seems often around.
> :-)

I tried this just now, but still the journal lingers.

> Otherwise, 'list->string' is defined twice. And the first one is not
> necessary, I guess.

Ah, thanks for catching this!

> The docstring of 'cache-lookup' is not coherent anymore. :-)

Yes, I haven't gotten around to fixing up all those yet. I thought I'll
get the code working first.

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