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

[Arun Isaac]

> Danny told me something like:
>
>   (catch (sqlite-error
>
> I have not tried yet.

Thank you, this was useful. I was able to catch and report the error. I
also found the log file for the guix-package-cache profile hook. It says

(repl-version 0 0)
Generating package cache for 
'/gnu/store/b6f9b5qbcn4r932whrr6m15rdimbgrhs-profile'...
(exception sqlite-error (value sqlite-open) (value 14) (value "Unable to open 
the database file"))

This could be a permission error, or something to do with the existence
or lack thereof of certain directories (such as /var) in the chroot of
the build daemon. I'm still figuring it out.

I'm also in half a mind to get some guile xapian bindings ready so we
can just do that instead of messing with sqlite here. But, let's
see. :-P

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