Re: dnf-automatic command_email failing to send email?

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On 7/29/20 9:43 PM, Gunnar Niels wrote:
Hello, I'm trying to configure dnf-automatic to automatically upgrade my system
on a daily basis and send me a summary via mailx using my mailgun account.
I have mailx configured and functioning as expected; I can use the 'mail' cmd
to send mail, and have other services using it to send mail.

The following gist[1] has my /etc/dnf/automatic.conf; all I've really changed about
it is to specify to use 'command_email' and uncommented the default 'command_format'
and 'stdin_format', along with setting the from/to emails. I've dropped some
debug logs into the python it runs, and I can see it gets to the emitter fine.
I was even able to send an example email with the emmitter that was constructed
by manually setting the subject and body and running `emitters[0].commit()`[2]!

The error I'm seeing in the dnf-automatic.service logs is:

Jul 29 06:45:16 <host>dnf-automatic[6226]: . . . message not sent.

Is this is a bug or do I have something misconfigured? Would be much appreciated
if someone could point me in the right direction.

[1] https://gist.githubusercontent.com/gunnarniels/7e29720adf654fee698c33d9315647b0/raw/64b515f733428f8895739e407c0644e1ee95b313/gistfile1.txt
[2] https://github.com/rpm-software-management/dnf/blob/4.2.23/dnf/automatic/main.py#L277

-GN

Hi folks. Wanted to follow up because we found it is a bug in the example command, see:

https://bugzilla.redhat.com/show_bug.cgi?id=1862739

"This will not ever work with systemd. All you'll see is ". . . message not sent" in the dnf-automatic service status and no email will be delivered. The reason for this is that mailx will fork, dnf-automatic will exit, and systemd will kill the mail process."

The solution is to add "-Ssendwait", which prevents mailx from forking.


I've confirmed the fix and applied to my systems.

-GN
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