Re: Systemd tip: service conditionals

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On Tue, May 21, 2013 at 10:12 AM, Lennart Poettering
<mzerqung@xxxxxxxxxxx> wrote:
> On Tue, 21.05.13 14:08, Simone Caronni (negativo17@xxxxxxxxx) wrote:
>
>> Hello,
>>
>> thanks for the tip.
>>
>> On 16 May 2013 20:41, Adam Williamson <awilliam@xxxxxxxxxx> wrote:
>>
>> > It's really neat stuff, and very easy to use: you just add a
>> > Condition(Something) statement to the .service file. For details on
>> > using these conditions, see 'man systemd.unit' and just search for
>> > Condition, and you'll find a list of all the available Conditions and
>> > how to use them.
>> >
>>
>> I have a question though, what is the best option in your opinion for a
>> service that should start only on a UEFI based system?
>
> /sys/firmware/efi only exists on EFI boots. In systemd you hence may use:
>
> ConditionPathExists=/sys/firmware/efi
>
>> If there's a way to check if Secure Boot is enabled that would be
>> great.
>
> There is an EFI var for that, but with systemd conditions you can only
> check for existance of EFI vars, not values, so this is currently not
> doable with systemd nicely.

You actually have to check two values anyway.  The SecureBoot variable
needs to be 1 and the SetupMode variable needs to be 0.  I don't think
it would be difficult for someone to write a small utility to check
for Secure Boot.

josh
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