[systemd-devel] Method to Wait for service to complete

[Harry Goldschmitt]

On 8/12/15 12:32 PM, killermoehre wrote:
> Am 12.08.2015 um 20:34 schrieb Harry Goldschmitt:
>> I have a service that has to complete before boot can continue. Is there
>> an “approved” method for doing this?
>>
>>  
>>
>> I have an ugly solution I’ve come up with… I’ve created a foo.target to
>> run my foo.service and set the default.target to my foo.target. After my
>> foo.service completes, I’m issuing “systemctl isolate multi-user” to
>> complete the boot.
>>
>>  
>>
>> Any help would be appreciated.
>>
>>  
>>
>> Harry
> Because my first answer wasn't send to the ML, here again:
>
>> Hello Harry,
>>
>> so the first question here always is: why do you think your service
>> is so important that no other service should be run at the same time?
>> Can you give us more information about your service? Some
>> explanaition what it does and why it should run before boot completes
>> (which is quite the funny thing, because "boot end" is never defined
>> with systemd, because everyting is brought up in parallel only taking
>> dependencies in account).
>>
>> Regards
> Harrys answer
>
>> My product is a Linux network appliance and my service updates
>> platform and peripheral firmware as needed without human
>> intervention. For the updates to take effect, the platform needs to
>> be rebooted after updates. If a network card needs new firmware, the
>> network is shut down before the update. If a peripheral needs to be
>> updated, it is shutdown, too. It would probably be a bad idea to let
>> users log into the appliance only to shutdown peripherals and then
>> reboot after a firmware update. In addition we have several services
>> that should not be brought up before it is known that firmware needs
>> to be updated.
>>
>> Before systemd, we just ran the service early in the boot process.
>> 99.9% of the time the service did nothing and boot continued. If
>> something had to be updated, the service did the update and rebooted.
> In the end after I got his answer it boils down to
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.freedesktop.org_wiki_Software_systemd_SystemUpdates_&d=BQIDaQ&c=8S5idjlO_n28Ko3lg6lskTMwneSC-WqZ5EBTEEvDlkg&r=naTX-IF7_QKyhqVve7SqbI_X3j-x4BDG1qRD3DBP5SU&m=ZM6b57JGl756Bwbd0UsC6ZGXt3aD-B8GRzrA_4gID2Y&s=fDLbpYg1uEoUgEUfFPmQiEPkfpiAXiaRn1AMycnZbT8&e= 
>
> Regards
>
Thank you. That's exactly what I need.

Harry

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