These changes were motivated by switching to a mechanism of loading data that
isn't dependent on the big advisory lock that prevents more than one revision
from being processed at a time.
Since INSERT ... RETURNING id; is used, this can block if another transaction
inserts the same data, and then cause an error when that transaction
commits. The solution is to use ON CONFLICT DO NOTHING, but you have to handle
the case when the INSERT doesn't return an id since the other transaction has
inserted it.
This commit rewrites insert-missing-data-and-return-all-ids to do as described
above, as well as being more efficient in how existing data is detected and to
use more vectors. Other utilities for inserting data are added as well.
Start at least looking for package replacements, and storing the
details (particularly the derivation). I'm looking at doing this so that build
servers using the Guix Data Service can build these derivations.
From the normalized one, to the one actually contained within glibc. Recent
versions of glibc also contain symlinks linking the normalized codeset to the
locales with the .UTF-8 ending, but older ones do not.
Maybe handling codeset normalisation for queries would be good, but the locale
values ending in .UTF-8 are more compatible and allow the code to be
simplified. For querying, maybe there should be a locales table which handles
different representations.
Add tests around the package module, extract out the use of the
inferior-package record assessors so that they aren't part of the tests, and
switch across the package-metadata module to use
insert-missing-data-and-return-all-ids.
