On Mon, Sep 24, 2018 at 7:51 PM Mantas Mikulėnas <grawity@xxxxxxxxx> wrote:
On Mon, Sep 24, 2018, 16:29 Kamil Jońca <kjonca@xxxxx> wrote:Lennart Poettering <lennart@xxxxxxxxxxxxxx> writes:
> On Mo, 24.09.18 12:04, Mantas Mikulėnas (grawity@xxxxxxxxx) wrote:
>
>> > Uh, this looks like something you need to ask the exim community,
>> > systemd can't make exim mail queueing decisions, that's entirely
>> > internal to exim.
>> >
>> > One question though: are you sure you have started the exim service
>> > properly beforehand? I am pretty sure exim won't process the mail
>> > queue if it's not running...
>>
>> exim's a bit oldschool, and whenever you pipe a message to 'sendmail', it
>> immediately forks a worker to deliver the message synchronously, regardless
>> of the main daemon running.
>
> Uh, what? Are you saying exim is forking off privileged daemon code
> from unprivileged user command invocations? Christ, that's ugly. They
Yes. exim is suid root to deliver mails.
> really really shouldn't do that.
But they do.
>
> It appears to me exim should figure out some way how clients such as
> 'sendmail' invocations can trigger queue dispatching some other way,
> for example, by making exim listen on some IPC of some form, or using
> inotify or anything else.
IIRC postfix is written that way, but I want to use exim, as it is more
configurable.
KJWhen I was writing exim systemd units for Arch a few years ago, I experimented with using queue_only=true and no permanent daemon at all, but triggering the queue runner via systemd.path units (start as soon as spool is non-empty) and timers (to replace the usual -q15m)..path units are inotify-based and can start exim as soon as /usr/bin/sendmail puts something in the queue.This didn't work well enough IIRC, but if it did, then it'd provide almost postfix-like architecture.
Or just making 'sendmail' send a SIGALRM to the main daemon would do the job perfectly well, I suspect...
Mantas Mikulėnas
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