[systemd-devel] systemd efi boot and default entry

[Michal Sekletar]

On Thu, Mar 31, 2016 at 11:10 AM, Jóhann B. Guðmundsson
<johannbg at gmail.com> wrote:
>
>
> On 03/30/2016 03:49 PM, Michal Sekletar wrote:
>>
>> On Mon, Mar 21, 2016 at 1:42 PM, Vasiliy Tolstov <v.tolstov at selfip.ru>
>> wrote:
>>
>>> Now i want to have two entries and assign priority to it via systemd,
>>> in my use-case i want to know last succeseful boot entry and use it.
>>> After upgrade i want to boot from new antry and if it fails - change
>>> priority to lower level...
>>
>> I don't believe this is currently possible. I've tried to implement
>> similar scheme in the past. I should probably resurrect that effort,
>>
>
> Had you finished writing the kernel driver that implements some kind of (
> sysfs? ) boot counting scheme?
> ( There is no  point in implementing something in systemd until that is in
> place )

We don't need to extend the kernel in order to implement this
particular mechanism. After new kernel is installed, you make it
default and mark as "tentative". Then, after first successful boot of
newly added bootloader entry you just remove the flag, because it is
known to work.

I withdrew my PR because we discussed this with Kay and we were not
sure we liked proposed scheme which uses file on disk as "tentative"
marker.

Michal