[Bug 1644975] Re: Resume from disk (swapfile) fails

[Wladimir Palant]

I can confirm that the following statement in
https://help.ubuntu.com/community/SwapFaq#Why_do_I_need_swap.3F is
wrong:

>  The hibernation implementation currently used in Ubuntu, swsusp,
needs a swap or suspend partition. It cannot use a swap file on an
active file system.

In fact, swsusp supports offsets just fine, and so does initramfs-tools
- mostly. The only thing blocking hibernation to a swap file from
working is that check in /usr/share/initramfs-tools/scripts/local-
premount/resume script. It calls wait-for-root which returns "ext4"
because no offset has been passed in. So the script will just assume
that no hibernation occurred and continue without resuming. While I
opted for simply removing the check, I strongly suspect that Ryo's patch
will fix the issue just as well.

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https://bugs.launchpad.net/bugs/1644975

Title:
  Resume from disk (swapfile) fails

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  Well, hibernation with swap file doesn't work while hibernation with
  swap partition works perfectly fine with the exactly same
  configuration and hardware.

  The reason is that when resuming from swap file, initramfs script
  can't correctly detect the machine are hibernated from the last shut
  down.

  And I investigated the issue and found this patch solved
  https://bugs.launchpad.net/ubuntu/+source/initramfs-
  tools/+bug/554009/+attachment/1366060/+files/resume.patch) for the
  hibernate to work.

  And it isn't applied to the package. I'd like to help this is really
  applied to the official package.

  In short, my setup is swapfile inside the system filesystem (LUKS +
  LVM2 + ext4).

  Also, I roughly followed this tutorial to prepare this configurartion
  that: https://ubuntuforums.org/showthread.php?t=1042946

  I've opening this bug because the original bug report is closed and
  getting no response...

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