updating system with local time

updating system with local time

[Arik Kleiman]

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Hi,

Is there any way to update my Read Only system (which connected  to the
world via cellular) with local time?

Im able to get the local time zone from ip lookup ... but can't use it to
update the system current time.

Thanks,
Arik

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Re: [yocto] updating system with local time

[Ross Burton]

Just use something like NTP to sync the local time. There's a number
of recipes that can do this, such as systemd/ntp/ntpdate.

Ross

On Tue, 4 Jan 2022 at 07:47, Arik Kleiman <arik.kleiman@gmail.com> wrote:
>
> Hi,
>
> Is there any way to update my Read Only system (which connected  to the world via cellular) with local time?
>
> Im able to get the local time zone from ip lookup ... but can't use it to update the system current time.
>
> Thanks,
> Arik
>
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Re: [yocto] updating system with local time

[Arik Kleiman]

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The thing is that ntpdate syncs system time to UTC

How can i set my system's time according to time zone?

On Tue, Jan 4, 2022, 14:05 Ross Burton <ross@burtonini.com> wrote:

> Just use something like NTP to sync the local time. There's a number
> of recipes that can do this, such as systemd/ntp/ntpdate.
>
> Ross
>
> On Tue, 4 Jan 2022 at 07:47, Arik Kleiman <arik.kleiman@gmail.com> wrote:
> >
> > Hi,
> >
> > Is there any way to update my Read Only system (which connected  to the
> world via cellular) with local time?
> >
> > Im able to get the local time zone from ip lookup ... but can't use it
> to update the system current time.
> >
> > Thanks,
> > Arik
> >
> > -=-=-=-=-=-=-=-=-=-=-=-
> > Links: You receive all messages sent to this group.
> > View/Reply Online (#55714):
> https://lists.yoctoproject.org/g/yocto/message/55714
> > Mute This Topic: https://lists.yoctoproject.org/mt/88186305/1676615
> > Group Owner: yocto+owner@lists.yoctoproject.org
> > Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [
> ross@burtonini.com]
> > -=-=-=-=-=-=-=-=-=-=-=-
> >
>

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Re: [yocto] updating system with local time

[Arik Kleiman]

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I don't have option to add systemd.

Added alrady tzdata and all time zone folders exist.
The issue is that ntpdate returns time in UTC.

I found a way to get local time zone (by using ip lookup). Now i looking
for a way to use it to update system time

On Tue, Jan 4, 2022, 15:47 Michael Opdenacker <
michael.opdenacker@bootlin.com> wrote:

> Hi Arik,
>
> On 1/4/22 1:15 PM, Arik Kleiman wrote:
> > The thing is that ntpdate syncs system time to UTC
> >
> > How can i set my system's time according to time zone?
>
>
> If you're using systemd, you could use the timedatectl command:
>
> https://linuxiac.com/how-to-set-timezone-and-sync-server-time-with-ntp-in-linux/
>
> Otherwise, you can add the "tzdata" recipe to your image. It should
> allow you to set the timezone that you want:
> https://www.yoctoproject.org/pipermail/yocto/2018-October/042964.html
>
> Cheers
> Michael.
>
> --
> Michael Opdenacker, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>
>

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Re: [yocto] updating system with local time

[Arik Kleiman]

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From what i read, there is a way to do this using timedatectl (its part of
systemd).

Anyone knows what recipe i need for that?


On Tue, Jan 4, 2022, 16:58 Arik Kleiman via lists.yoctoproject.org
<arik.kleiman=gmail.com@lists.yoctoproject.org> wrote:

> I don't have option to add systemd.
>
> Added alrady tzdata and all time zone folders exist.
> The issue is that ntpdate returns time in UTC.
>
> I found a way to get local time zone (by using ip lookup). Now i looking
> for a way to use it to update system time
>
> On Tue, Jan 4, 2022, 15:47 Michael Opdenacker <
> michael.opdenacker@bootlin.com> wrote:
>
>> Hi Arik,
>>
>> On 1/4/22 1:15 PM, Arik Kleiman wrote:
>> > The thing is that ntpdate syncs system time to UTC
>> >
>> > How can i set my system's time according to time zone?
>>
>>
>> If you're using systemd, you could use the timedatectl command:
>>
>> https://linuxiac.com/how-to-set-timezone-and-sync-server-time-with-ntp-in-linux/
>>
>> Otherwise, you can add the "tzdata" recipe to your image. It should
>> allow you to set the timezone that you want:
>> https://www.yoctoproject.org/pipermail/yocto/2018-October/042964.html
>>
>> Cheers
>> Michael.
>>
>> --
>> Michael Opdenacker, Bootlin
>> Embedded Linux and Kernel engineering
>> https://bootlin.com
>>
>>
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> https://lists.yoctoproject.org/g/yocto/message/55721
> Mute This Topic: https://lists.yoctoproject.org/mt/88186305/6638820
> Group Owner: yocto+owner@lists.yoctoproject.org
> Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [
> arik.kleiman@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>
>

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Re: [yocto] updating system with local time

[Ross Burton]

On Tue, 4 Jan 2022 at 14:58, Arik Kleiman <arik.kleiman@gmail.com> wrote:
>
> I don't have option to add systemd.
>
> Added alrady tzdata and all time zone folders exist.
> The issue is that ntpdate returns time in UTC.
>
> I found a way to get local time zone (by using ip lookup). Now i looking for a way to use it to update system time

Just write a small tool to map the local timezone from the IP lookup
to a timezone name (such as Europe/London) and write it to
/etc/timezone. You could do that with a short ifup script.

That said, for headless appliances working in UTC is absolutely fine,
and for user-facing devices it's perfectly acceptable to ask the user
what the timezone is, as your geo-IP lookup might be incorrect anyway.

Ross

Re: [yocto] updating system with local time

[Arik Kleiman]

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can't write it to /etc/localtime ... it's a read only system.


There is an environment variable named TZ, when ever it is changed, local
time is changed as well.

Is there a way (by script or cron job) to set the way system will update as
well?

10x,
Arik

On Tue, Jan 4, 2022 at 5:46 PM Ross Burton <ross@burtonini.com> wrote:

> On Tue, 4 Jan 2022 at 14:58, Arik Kleiman <arik.kleiman@gmail.com> wrote:
> >
> > I don't have option to add systemd.
> >
> > Added alrady tzdata and all time zone folders exist.
> > The issue is that ntpdate returns time in UTC.
> >
> > I found a way to get local time zone (by using ip lookup). Now i looking
> for a way to use it to update system time
>
> Just write a small tool to map the local timezone from the IP lookup
> to a timezone name (such as Europe/London) and write it to
> /etc/timezone. You could do that with a short ifup script.
>
> That said, for headless appliances working in UTC is absolutely fine,
> and for user-facing devices it's perfectly acceptable to ask the user
> what the timezone is, as your geo-IP lookup might be incorrect anyway.
>
> Ross
>

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Re: [yocto] updating system with local time

[Ross Burton]

Package /etc/timezone as a symlink to /run/timezone, and write to that instead?

Ross

On Tue, 4 Jan 2022 at 17:35, Arik Kleiman <arik.kleiman@gmail.com> wrote:
>
> can't write it to /etc/localtime ... it's a read only system.
>
>
> There is an environment variable named TZ, when ever it is changed, local time is changed as well.
>
> Is there a way (by script or cron job) to set the way system will update as well?
>
> 10x,
> Arik
>
> On Tue, Jan 4, 2022 at 5:46 PM Ross Burton <ross@burtonini.com> wrote:
>>
>> On Tue, 4 Jan 2022 at 14:58, Arik Kleiman <arik.kleiman@gmail.com> wrote:
>> >
>> > I don't have option to add systemd.
>> >
>> > Added alrady tzdata and all time zone folders exist.
>> > The issue is that ntpdate returns time in UTC.
>> >
>> > I found a way to get local time zone (by using ip lookup). Now i looking for a way to use it to update system time
>>
>> Just write a small tool to map the local timezone from the IP lookup
>> to a timezone name (such as Europe/London) and write it to
>> /etc/timezone. You could do that with a short ifup script.
>>
>> That said, for headless appliances working in UTC is absolutely fine,
>> and for user-facing devices it's perfectly acceptable to ask the user
>> what the timezone is, as your geo-IP lookup might be incorrect anyway.
>>
>> Ross