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Re: Status of hibernation (suspend to disk) in Guix

From: Mekeor Melire
Subject: Re: Status of hibernation (suspend to disk) in Guix
Date: Sat, 10 Dec 2022 01:00:24 +0000

2022-12-09 23:10

> 2022-12-05 17:23
> > in #59746 I skipped documenting `resume_offset` with more detail, even
> > if it's needed for resuming from a swap file. The reason is that
> > according to [swsusp doc][1], some specific tool may be needed to
> > compute the swap file offset. There is [swap-offset][2] from the
> > uswsusp suite, which is missing from Guix and no longer shipped with
> > Debian.
> What about the "filefrag" executable from the "e2fsprogs" package.
> According to this article, it can be used in place of the deprecated
> uswsusp suite:

I just tried this out. And it worked like a charm! I have hibernated and
resumed successfully - first time with Guix System. I'm so happy :)

Would you like to add instructions for swap-files to your
patch-series #59746?

What I did: First, determine offset:

--8<---------------cut here---------------start------------->8---
$ sudo filefrag -v /swapfile
Filesystem type is: ef53
File size of /swapfile is 1717986918 (4194304 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..       0:    5308416..   5308416:      1:
--8<---------------cut here---------------end--------------->8---

Then, use offset in operating-system declaration:

--8<---------------cut here---------------start------------->8---
--8<---------------cut here---------------end--------------->8---

Caveat: IIUC, this does not work with Btrfs.

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