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

[Arun Isaac]

>> Thank you, this was useful. I was able to catch and report the error. I
>
> Where have you reported the error?

I reported the error to the derivation log. For example, if the
derivation for the guix-package-cache derivation is
/gnu/store/cyf2h3frcjxm147dii5qic8d6kpm39nq-guix-package-cache.drv, the
log file will be at
/var/log/guix/drvs/cy/f2h3frcjxm147dii5qic8d6kpm39nq-guix-package-cache.drv.bz2.
 Notice
that the directory name under drvs is the first two letters of the hash,
and the file name under that directory is the remaining letters.

Also please find attached a dump of my code so far.

>> 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.
>
> Hum? And this should explain why it is working with the REPL and not
> with the CLI, right?

This could expalin it, but I am not sure if this is the correct
explanation.

>> 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
>
> Cool!
> Let me know if you push something somewhere.

Sure, will let you know.

0001-fast-search.patch
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