Failback mailboxes?

[Vincent Bernat]

 ❦ 14 août 2017 09:24 +0300, Dag Nygren <dag at newtech.fi> :

> Have been using Fedora as my dovecot server for
> some time and am struggling with systemd
> at every update.
> Fedora insists on setting
> ProtectSystem=full in both dovecot.service and postfix.service
> at every update of the packages.
>
> This makes my mailstore which is in /usr/local/var/mail
> Read-only.
>
> And this makes the incoming emails delivered through
> dovecot-lda disappear into /dev/null until I notice
> the problem and we lose incoming emails.
>
> My question is:
> Is there any way to set up a failback mailstore
> for these occasions?
>
> PS! I really hate systemd - Destroys the UNIX way of
> doing things with a heavy axe....

In /etc/systemd/system/dovecot.service.d/10-mailboxes.conf, put:

[Service]
ReadWritePaths=/usr/local/var/mail

Same for Postfix. This won't be overwritten on updates.
-- 
Don't stop at one bug.
            - The Elements of Programming Style (Kernighan & Plauger)