Add Full Text Search capability to Dovecot.
- Add 'dovecot-fts-xapian' to the list of packages for the email app.
- Add relevant configs for both dovecot 2.3 and 2.4
- Add a systemd timer to periodically clean search indexes
Configurations taken from plugin's upstream documentation:
https://github.com/grosjo/fts-xapian
Sunil:
- Tweak the dovecot 2.4 configuration. Remove explicit configuration same as or
close to default values.
- Drop the timer service for cleaning up the index. Dovecot documentation that
FTS plugins do it themselves.
- Drop the re-indexing command on setup. This could not be properly tested. On
first search, indexes will be created for mailboxes that don't have them.
Tests done:
- Perform a fresh install, on both Bookworm and Trixie, confirm the install is
successful, confirm the systemd service runs with exit 0.
- On Bookworm, apply the patches on an existing setup, confirm the patches apply
as expected.
- On a production like setup, set dovecot 2.4 to debug mode and check the
journal logs while receiving an email: The logs confirm that the fts module is
loaded and that it automatically creates a db for the indexes. I also opened the
newly created db file with less and confirmed that the human readable parts
contain my recent email.
- Using Sogo, perform a full search (including headers and body). Search works
and indexes are freshly created on all the folders.
Signed-off-by: Benedek Nagy <contact@nbenedek.me>
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
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