more debugging for gentoo usage & supporting feature requests

["Robin H. Johnson" <robbat2@gentoo.org>]

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Hi,

I moved the Gentoo instance to a much beefier machine & newer kernel,
ingest is a lot faster; but there's still some hiccups.

1. Request for more debugging details about mails: Seems that many of
our oldest mails don't get ingested - and there's no output about why.
I don't know if -watch actually scanned that folder or not.

1.1. Possibly related:
Intended config is that the mail should be ingested regardless of the
email address on the headers. Way back in time, the Gentoo lists were
renamed a few times, and the files are sorted into the correct folders.
I think this impacted any attempted ingest via -mda because there's no
other way to override what list a given mail on stdin should be
associated with.

The headers may be inconsistent, changed style, name, or even be absent
in a few cases.

2.
What's the intended way for public-inbox-mda to function with no
SpamAssassin installed at all? "spamcheck = " doesn't seem to do it.

3.
As a formal feature request:
Change the arguments of: public-inbox-watch 
- Add --all to mean all lists in the config
- no arguments => implicit --all
- $LISTNAME/$INBOXPATH => one *OR* more inboxes manually specified.

I did a hacky split of the configuration for Gentoo, and things are a
LOT more stable with 120 instances; but it's a little wasteful: I'd like
to give the high-traffic lists their own instance, and group the
low-traffic instances together.

Downside of my hacky code is that I have 120 processes that just say
"/usr/bin/public-inbox-watch", and I have to be creative to see which
list a given process is linked to.

4.
Make public-inbox-init NOT attempt to write to any configuration files.

Trying to implement segregation of roles:
- config files owned by root only; readable by public-inbox users.
- source maildirs read-only to user running public-inbox-watch
- public-inbox dirs writable to user running public-inbox-watch
- public-inbox dirs readable to user running public-inbox-httpd

Intent:
- public-inbox-httpd CANNOT read or write the source maildirs.
- public-inbox-watch CANNOT write the source maildirs.
- neither process can write the config file

-- 
Robin Hugh Johnson
Gentoo Linux: Dev, Infra Lead, Foundation President & Treasurer
E-Mail   : robbat2@gentoo.org
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