[systemd-devel] Implementing resume from hibernation as a systemd unit file

[Ivan Shapovalov]

Hello all,

I'm trying to implement resuming from hibernation with systemd-based initramfs,
i. e. in terms of systemd unit files. That is, there should be a unit which
waits for the resume device and writes its major:minor into /sys/power/resume.

I've chosen to write a templated resume@<path>.service and a generator which
parses 'resume=' kernel parameter and enables a corresponding instance of the
resume at .service unit.

The resume at .service itself shall be ordered so that it is activated when there
are no filesystems mounted read-write, except tmpfs instances. It will be good
if it works both from initramfs and from real rootfs (if it is mounted RO).

So, here are some questions:
- is it the way to go (overall)?
- is it OK to use generators for outlined purpose?
- how to order resume at .service and where to symlink it?

I'm using Arch, if that matters -- but, IIUC, Arch strives to do everything
"in the upstream's way", so there should be no distro-specific details.

Thanks,
-- 
Ivan Shapovalov / intelfx /
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