[arch-projects] [mkinitcpio] [PATCH 2/2] resume: generate a udev rule for specifying device

[Thomas Bächler]

Am 26.11.2013 19:00, schrieb Tom Gundersen:
> On Tue, Nov 26, 2013 at 5:09 PM, Dave Reisner <d at falconindy.com> wrote:
>> On Tue, Nov 26, 2013 at 04:35:13PM +0100, Thomas Bächler wrote:
>>> Am 26.11.2013 16:22, schrieb Dave Reisner:
>>>> I'll ask Harald about this -- Dracut uses a very similar mechanism (but
>>>> a bit more complex/convoluted).
>>>
>>> Nobody said this was easy to solve.
>>>
>> Consider the patch shelved for now. It's not something I care about --
>> just thought I'd take a stab at fixing it for others.
> 
> Well now I got interested ;-)
> 
> Could this be solved (in a systemd world) by a systemd generator
> (running in the initramfs of course) generating a one-shot service
> which does the RUN from your udev rule, but which is ordered between
> the <hibernation>.device and local-fs-pre.target?

This should work, but we have to be careful that everything that touches
file systems is ordered After=local-fs-pre.target.

I would not put this into udev, but use a service file. Simply have a
service ordered Before=local-fs-pre.target, which binds to the
hibernation device (generated from the resume= option). I have no idea
what happens if you add another job to systemd in the middle of booting
up - and doing everything with a service file seems cleaner to me.

FYI, systemd-fsck at .service currently has no ordering to
local-fs-pre.target, this may lead to races between resuming and fsck.


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