Abstract db access from Postfix and Dovecot

[kaiyou]

This is a work in progress but I guess the review can start already as 90% of it is testable.

Most of the original work is discussed in #420 and #445. The general idea is that

• Podop (https://github.com/mailu/podop) is a proxy framework between Postfix/Dovecot and any Python available service, including notably a REST API
• A fairly simple (and still a bit too tightly dependent on Postfix/Dovecot structures) API was written as part of the internal REST API already leveraged for authentication, the API includes transparent authentication for Dovecot, domain, alias, mailbox and transport resolution for Postfix, quotas, sieve scripts.
• A simple sieve script as a Jinja template was written, removing the need for extdata in sieve.
• Dovecot and Postfix were bound to the admin container API using Podop, embedded as a side process in both start scripts.
• Fetchmail was bound to a simple internal API on the admin container.

No change should be required in a standard compose environment. There are still a lot of tests to run before declaring this equivalent to the current database queries.

[muhlemmer]

@kaiyou Did you see the conflict?

[kaiyou]

Yes, the conflict can be resolved at merge time and is pretty straightforward :)

[muhlemmer]

All seems good 🥇

[muhlemmer]

@kaiyou, I looked to resolving the merge conflict myself, but I'm not comfortable doing it. Especially for the core/postfix/conf/master.cf I have my doubts.

[kaiyou]

I'll resolve it tomorrow then :)
Thank you so much for reviewing

[kaiyou]

Merged, if you could have a quick look and see everything still runs fine, especially the tenacity part :)

[muhlemmer]

You need another backslash at the end of this line.

[kaiyou]

God do I need more coffee.

[muhlemmer]

We might put an expresso machine on the "Donation list":
ERROR: Service 'smtp' failed to build: The command '/bin/sh -c apk add --no-cache postfix postfix-pcre rsyslog && python3 py3-pip && pip3 install --upgrade pip && pip3 install jinja2 podop tenacity' returned a non-zero code: 127

Edit
Sorry, pushed send too soon.

See:
https://travis-ci.org/Mailu/Mailu/builds/439511658#L1023

I think you are trying to install python3, not running it? So the first && should be \ as well.

[muhlemmer]

Omit && beginning of line

[muhlemmer]

@kaiyou Wrong line, the build fails on line 3 /4. apk add needs to install python3 and py3-pip. With the && in front, you just try to run python3 which is not installed.

[muhlemmer]

All back to normal again :p. It works fine now.

[HorayNarea]

we have a merge \o/

[muhlemmer]

🎉 🎈 🎂