Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Lennart Poettering]

On Mi, 18.11.20 09:15, Francis Moreau (francis.m...@gmail.com) wrote:

> >
> > Eg:
> >
> > $ busctl get-property org.freedesktop.systemd1 
> > /org/freedesktop/systemd1/unit/gdm_2eservice 
> > org.freedesktop.systemd1.Service NRestarts
> > u 0
> >
>
> I didn't know NRestart property, thanks. But it only counts automatic
> restart, not manual one.
>
> And also there's no need to use busctl, for getting service properties
> I can use 'systemctl show -p'

I am not sure what you even mean by "has been restarted"? Compared to
when?

You could enquire the invocation ID of the service at two points in
time, and if it changed in between the service got restarted.

  $ busctl get-property org.freedesktop.systemd1 
/org/freedesktop/systemd1/unit/gdm_2eservice org.freedesktop.systemd1.Unit 
InvocationID

The invocation is randomly generated whenever a new start cycle begins.

Lennart

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Lennart Poettering]

On Di, 10.11.20 12:47, Arian Van Putten (ar...@wire.com) wrote:

> I think what you might want is `Type=exec` instead of `Type=simple` in your
> unit file.  It was recently added to systemd.

Recently? That was in 2018! 2 Years ago!

Lennart

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Francis Moreau]

On Tue, Nov 10, 2020 at 6:35 PM Luca Boccassi  wrote:
>
> On Tue, 2020-11-10 at 17:22 +, Luca Boccassi wrote:
> > On Tue, 2020-11-10 at 18:12 +0100, Francis Moreau wrote:
> > > On Tue, Nov 10, 2020 at 2:43 PM Luca Boccassi  wrote:
> > > > On Tue, 2020-11-10 at 11:50 +0100, Francis Moreau wrote:
> > > > > On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
> > > > >  wrote:
> > > > > > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) 
> > > > > > wrote:
> > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > After restarting a service with "systemctl try-restart ..." I 
> > > > > > > want to
> > > > > > > verify that the service has been restarted.
> > > > > > >
> > > > > > > How can I reliably do this without using the dbus API ?
> > > > > >
> > > > > > D-Bus is how systemd exposes its state. If you don't want to use 
> > > > > > that,
> > > > > > you won't get the state information.
> > > > > >
> > > > >
> > > > > dbus is overkill for my little bash script.
> > > >
> > > > It's pretty simple, and a one-liner, to get the value of a property
> > > > from a bash script with busctl. Eg:
> > > >
> > > > $ busctl get-property org.freedesktop.systemd1 
> > > > /org/freedesktop/systemd1/unit/gdm_2eservice 
> > > > org.freedesktop.systemd1.Service Restart
> > > > s "always"
> > > >
> > >
> > > Thank you but I'm not interested in the Restart property of a service,
> > > I want to know if a service as been restarted.
> >
> > It's just an example on how to get D-Bus data on units easily from a
> > bash script.
>
> Eg:
>
> $ busctl get-property org.freedesktop.systemd1 
> /org/freedesktop/systemd1/unit/gdm_2eservice org.freedesktop.systemd1.Service 
> NRestarts
> u 0
>

I didn't know NRestart property, thanks. But it only counts automatic
restart, not manual one.

And also there's no need to use busctl, for getting service properties
I can use 'systemctl show -p'

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Luca Boccassi]

On Tue, 2020-11-10 at 17:22 +, Luca Boccassi wrote:
> On Tue, 2020-11-10 at 18:12 +0100, Francis Moreau wrote:
> > On Tue, Nov 10, 2020 at 2:43 PM Luca Boccassi  wrote:
> > > On Tue, 2020-11-10 at 11:50 +0100, Francis Moreau wrote:
> > > > On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
> > > >  wrote:
> > > > > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
> > > > > 
> > > > > > Hello,
> > > > > > 
> > > > > > After restarting a service with "systemctl try-restart ..." I want 
> > > > > > to
> > > > > > verify that the service has been restarted.
> > > > > > 
> > > > > > How can I reliably do this without using the dbus API ?
> > > > > 
> > > > > D-Bus is how systemd exposes its state. If you don't want to use that,
> > > > > you won't get the state information.
> > > > > 
> > > > 
> > > > dbus is overkill for my little bash script.
> > > 
> > > It's pretty simple, and a one-liner, to get the value of a property
> > > from a bash script with busctl. Eg:
> > > 
> > > $ busctl get-property org.freedesktop.systemd1 
> > > /org/freedesktop/systemd1/unit/gdm_2eservice 
> > > org.freedesktop.systemd1.Service Restart
> > > s "always"
> > > 
> > 
> > Thank you but I'm not interested in the Restart property of a service,
> > I want to know if a service as been restarted.
> 
> It's just an example on how to get D-Bus data on units easily from a
> bash script.

Eg:

$ busctl get-property org.freedesktop.systemd1 
/org/freedesktop/systemd1/unit/gdm_2eservice org.freedesktop.systemd1.Service 
NRestarts
u 0

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Luca Boccassi]

On Tue, 2020-11-10 at 18:12 +0100, Francis Moreau wrote:
> On Tue, Nov 10, 2020 at 2:43 PM Luca Boccassi  wrote:
> > On Tue, 2020-11-10 at 11:50 +0100, Francis Moreau wrote:
> > > On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
> > >  wrote:
> > > > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
> > > > 
> > > > > Hello,
> > > > > 
> > > > > After restarting a service with "systemctl try-restart ..." I want to
> > > > > verify that the service has been restarted.
> > > > > 
> > > > > How can I reliably do this without using the dbus API ?
> > > > 
> > > > D-Bus is how systemd exposes its state. If you don't want to use that,
> > > > you won't get the state information.
> > > > 
> > > 
> > > dbus is overkill for my little bash script.
> > 
> > It's pretty simple, and a one-liner, to get the value of a property
> > from a bash script with busctl. Eg:
> > 
> > $ busctl get-property org.freedesktop.systemd1 
> > /org/freedesktop/systemd1/unit/gdm_2eservice 
> > org.freedesktop.systemd1.Service Restart
> > s "always"
> > 
> 
> Thank you but I'm not interested in the Restart property of a service,
> I want to know if a service as been restarted.

It's just an example on how to get D-Bus data on units easily from a
bash script.

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Francis Moreau]

On Tue, Nov 10, 2020 at 2:43 PM Luca Boccassi  wrote:
>
> On Tue, 2020-11-10 at 11:50 +0100, Francis Moreau wrote:
> > On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
> >  wrote:
> > > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
> > >
> > > > Hello,
> > > >
> > > > After restarting a service with "systemctl try-restart ..." I want to
> > > > verify that the service has been restarted.
> > > >
> > > > How can I reliably do this without using the dbus API ?
> > >
> > > D-Bus is how systemd exposes its state. If you don't want to use that,
> > > you won't get the state information.
> > >
> >
> > dbus is overkill for my little bash script.
>
> It's pretty simple, and a one-liner, to get the value of a property
> from a bash script with busctl. Eg:
>
> $ busctl get-property org.freedesktop.systemd1 
> /org/freedesktop/systemd1/unit/gdm_2eservice org.freedesktop.systemd1.Service 
> Restart
> s "always"
>

Thank you but I'm not interested in the Restart property of a service,
I want to know if a service as been restarted.

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Luca Boccassi]

On Tue, 2020-11-10 at 11:50 +0100, Francis Moreau wrote:
> On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
>  wrote:
> > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
> > 
> > > Hello,
> > > 
> > > After restarting a service with "systemctl try-restart ..." I want to
> > > verify that the service has been restarted.
> > > 
> > > How can I reliably do this without using the dbus API ?
> > 
> > D-Bus is how systemd exposes its state. If you don't want to use that,
> > you won't get the state information.
> > 
> 
> dbus is overkill for my little bash script.

It's pretty simple, and a one-liner, to get the value of a property
from a bash script with busctl. Eg:

$ busctl get-property org.freedesktop.systemd1 
/org/freedesktop/systemd1/unit/gdm_2eservice org.freedesktop.systemd1.Service 
Restart
s "always"

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Francis Moreau]

On Tue, Nov 10, 2020 at 12:47 PM Arian Van Putten  wrote:
>
> I think what you might want is `Type=exec` instead of `Type=simple` in your 
> unit file.  It was recently added to systemd.
>
> then `systemctl restart` will return a failure when the main process fails to 
> start. I hope that helps.

Thank you however I don't control the type of the restarted units, it
can be anything,

>
>
> On Tue, Nov 10, 2020 at 11:50 AM Francis Moreau  
> wrote:
>>
>> On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
>>  wrote:
>> >
>> > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
>> >
>> > > Hello,
>> > >
>> > > After restarting a service with "systemctl try-restart ..." I want to
>> > > verify that the service has been restarted.
>> > >
>> > > How can I reliably do this without using the dbus API ?
>> >
>> > D-Bus is how systemd exposes its state. If you don't want to use that,
>> > you won't get the state information.
>> >
>>
>> dbus is overkill for my little bash script.
>>
>> --
>> Francis
>> ___
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>> https://lists.freedesktop.org/mailman/listinfo/systemd-devel
>
>
>
> --
>
> Arian van Putten  l  Software Engineer
>
> @arian_wire on Wire
>
> Wire - Secure team messaging.
>
>  Zeta Project Germany GmbH  l  Rosenthaler Straße 40, 10178 Berlin, Germany
>
> Geschäftsführer/Managing Director: Morten J. Broegger
>
> HRB 149847 beim Handelsregister Charlottenburg, Berlin
>
> VAT-ID DE288748675



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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Arian Van Putten]

I think what you might want is `Type=exec` instead of `Type=simple` in your
unit file.  It was recently added to systemd.

then `systemctl restart` will return a failure when the main process fails
to start. I hope that helps.



On Tue, Nov 10, 2020 at 11:50 AM Francis Moreau 
wrote:

> On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
>  wrote:
> >
> > On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
> >
> > > Hello,
> > >
> > > After restarting a service with "systemctl try-restart ..." I want to
> > > verify that the service has been restarted.
> > >
> > > How can I reliably do this without using the dbus API ?
> >
> > D-Bus is how systemd exposes its state. If you don't want to use that,
> > you won't get the state information.
> >
>
> dbus is overkill for my little bash script.
>
> --
> Francis
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Geschäftsführer/Managing Director: Morten J. Broegger

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VAT-ID DE288748675
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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Francis Moreau]

On Tue, Nov 10, 2020 at 11:30 AM Lennart Poettering
 wrote:
>
> On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:
>
> > Hello,
> >
> > After restarting a service with "systemctl try-restart ..." I want to
> > verify that the service has been restarted.
> >
> > How can I reliably do this without using the dbus API ?
>
> D-Bus is how systemd exposes its state. If you don't want to use that,
> you won't get the state information.
>

dbus is overkill for my little bash script.

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Re: [systemd-devel] How can I simply check that a service has been restarted ?

[Lennart Poettering]

On Di, 10.11.20 10:28, Francis Moreau (francis.m...@gmail.com) wrote:

> Hello,
>
> After restarting a service with "systemctl try-restart ..." I want to
> verify that the service has been restarted.
>
> How can I reliably do this without using the dbus API ?

D-Bus is how systemd exposes its state. If you don't want to use that,
you won't get the state information.

Sorry,

Lennart

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[systemd-devel] How can I simply check that a service has been restarted ?

[Francis Moreau]

Hello,

After restarting a service with "systemctl try-restart ..." I want to
verify that the service has been restarted.

How can I reliably do this without using the dbus API ?

Thank you
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