Re: No daemon-reload or restart with %systemd_postun_with_restart

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On Tue, Mar 22, 2022, 00:12 Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx> wrote:
Ewoud Kohl van Wijngaarden writes:

> On Mon, Mar 21, 2022 at 08:27:35AM -0400, Sam Varshavchik wrote:
>> Ewoud Kohl van Wijngaarden writes:
>>
>>> On Fri, Mar 18, 2022 at 06:22:08PM -0400, Sam Varshavchik wrote:
>>>> The only thing that https://docs.fedoraproject.org/en-US/packaging-
>>>> guidelines/Scriptlets/ tells me to do is to put %systemd_postun_with_restart 
>>>> in my %post. However:
>>>>
>>>> 1) systemd complains that it wants a daemon-reload, in order to pick up an 
>>>> updated .service file
>>>>
>>>> 2) I still must manually run systemctl reload-or-restart --marked, in order 
>>>> to actually restart an updated service
>>>>
>>>> It seems to be there's a missing step, in here. By comparison I prepared 
>>>> comparable .deb packages for Ubuntu, using dh_installsystemd in the install 
>>>> script. The end result:
>>>>
>>>> A) The initial .deb install enabled and started the service.
>>>>
>>>> B) Bumping the release, rebuilding, and installing the newer package results 
>>>> in an automatic daemon-reload and restart, restarting the service.
>>>>
>>>> Overall .deb's systemd integration seems to go smoother (compared to the 
>>>> rest of the .deb packaging process) than rpm's.
>>>>
>>>> Is there a specific reason why %systemd_postun_with_restart stops before 
>>>> finishing the job? Am I missing something that I can install, to have this 
>>>> happen auto-magically?
>>>
>>> I think daemon-reload changed to file triggers in systemd 228:
>>>
>>> https://github.com/systemd/systemd/commit/
>>> 873e413323dfff4023604849c70944674ae5cd29
>>>
>>> However, the scriptlets documentation[1] states to use %systemd_post with 
>>> %post and %systemd_postun_with_restart with %postun. %Perhaps that you're 
>>> using %systemd_postun_with_restart in %post is the source of your problems?
>>
>> No, my invocation is in %postun. Furthermore, it wouldn't matter, since at 
>> %post time the new package and the new service unit should already be 
>> installed and restartable.
>>
>> And, as I wrote:
>>
>>>> 1) systemd complains that it wants a daemon-reload, in order to pick up an 
>>>> updated .service file
>>
>> If ot was "changed to file triggers", well, it's not working since nothing 
>> is getting triggered. Furthermore, %systemd_postun_with_restart runs:
>>
>> /usr/lib/systemd/systemd-update-helper mark-restart-system-units
>>
>> which does:
>>
>> systemctl set-property "$unit" Markers=+needs-restart &
>>
>> That's all it does. Then, as I wrote:
>>
>>>> 2) I still must manually run systemctl reload-or-restart --marked, in order 
>>>> to actually restart an updated service
>>
>> So, the shipped systemd scriptlets are still, very much, under an impression 
>> that explicit action needs to be taken to restart and/or reload 
>> updated .services. But, nothing gets reloaded. The .service files gets 
>> marked for a restart, but, from what I can tell, nothing ever gets restarted.
>
> Do you happen to have the spec file and/or the RPMs? How can we replicate 
> the findings?

Take the following spec file, below, and just feed it to rpmbuild -ba.

Then, rpm -ivh the binary rpm. Then:

systemctl enable testsystemd
systemctl start testsystemd
systemctl status testsystemd

You'll get something like this:

[mrsam@jack tmp]$ systemctl status testsystemd
● testsystemd.service - testsystemd
     Loaded: loaded (/usr/lib/systemd/system/testsystemd.service; enabled; 
vend>
     Active: active (exited) since Mon 2022-03-21 19:02:37 EDT; 10s ago
    Process: 88834 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 88834 (code=exited, status=0/SUCCESS)
        CPU: 2ms

Mar 21 19:02:37 jack systemd[1]: Starting testsystemd…
Mar 21 19:02:37 jack systemd[1]: Finished testsystemd.

Up to now, everything looks good.

Now, take this spec file, bump the release, feed it to rpmbuild again.

According to my best understanding of systemd's published documentation: 
installing an updated package should automatically restart the active 
service, shouldn't it?

But after I fed the new version to rpm -UvhF, what I got was:

[mrsam@jack tmp]$ systemctl status testsystemd | cat
Warning: The unit file, source configuration file or drop-ins of 
testsystemd.service changed on disk. Run 'systemctl daemon-reload' to reload 
units.
● testsystemd.service - testsystemd
     Loaded: loaded (/usr/lib/systemd/system/testsystemd.service; enabled; 
vendor preset: disabled)
     Active: active (exited) since Mon 2022-03-21 19:02:37 EDT; 4min 35s ago
    Process: 88834 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 88834 (code=exited, status=0/SUCCESS)
      Tasks: 0 (limit: 76902)
     Memory: 0B
        CPU: 0
     CGroup: /system.slice/testsystemd.service

Mar 21 19:02:37 jack systemd[1]: Starting testsystemd…
Mar 21 19:02:37 jack systemd[1]: Finished testsystemd.

A loud complaint at the beginning that systemd wasn't reload. Same, 
unchanged, syslog timestamp from the initial start.

This is on up to date F35.

Then, at this point:

sudo systemctl daemon-reload
sudo systemctl reload-or-restart --marked

[mrsam@jack tmp]$ systemctl status testsystemd
● testsystemd.service - testsystemd
     Loaded: loaded (/usr/lib/systemd/system/testsystemd.service; enabled; 
vend>
     Active: active (exited) since Mon 2022-03-21 19:08:29 EDT; 26s ago
    Process: 89032 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
   Main PID: 89032 (code=exited, status=0/SUCCESS)
        CPU: 1ms

Mar 21 19:08:29 jack systemd[1]: Starting testsystemd…
Mar 21 19:08:29 jack systemd[1]: Finished testsystemd.

Now, everything is normal, and new syslogs showing a restart.

So, as far as I can tell: %systemd_postun_with_restart did not restart 
anything.





Name:           testsystemd
Version:        1
Release:        3%{?dist}
Summary:        Test
License:        GPL

%description


%prep


%build


%install
mkdir -p $RPM_BUILD_ROOT/lib/systemd/system
cat >$RPM_BUILD_ROOT/lib/systemd/system/testsystemd.service <<EOF
[Unit]
Description=testsystemd

[Install]
WantedBy=multi-user.target

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/bin/true
ExecStop=/bin/true
EOF

%post
%systemd_post testsystemd.service

%preun
%systemd_preun testsystemd.service

%postun
%systemd_postun_with_restart testsystemd.service

%files
/lib/systemd/system/*

I wonder if this behaves the way it does because you're using a oneshot service as an example here? It exits as soon as it starts, so there is not even a running process to "restart" on package upgrade.

Fabio


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