[Bug 1769297] Re: resume from hibernation broken when resume image is autodetected

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https://bugs.launchpad.net/bugs/1769297

Title:
  resume from hibernation broken when resume image is autodetected

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  I found a reason of non-functioning resume from hibernation when
  resume partition/file is autodetected by intiramfs hook /usr/share
  /initramfs-tools/hooks/resume.

  Here is the scenario:
  1) hook /usr/share/initramfs-tools/hooks/resume creates config conf/conf.d/zz-resume-auto saved in initrd image, containing one variable: RESUME=UUID=106238b0-707d-4422-866d-a7534da50702 in my case

  2) during boot init script sets 'resume' variable to 'RESUME' value
  from conf/conf.d/zz-resume-auto, then it executes local-premount
  scripts including local-premount/resume

  3) resuming script local-premount/resume (/usr/share/initramfs-tools/scripts/local-premount/resume) tries to get resume device major-minor numbers by these lines:
  DEV=$(readlink ${resume})
  DEV=/sys/class/block/${DEV##*/}/dev
  if [ -r "$DEV" ]; then
          read MAJMIN < "$DEV"
  fi

  4) next check fails and resume process silently aborts:
  if [ -z "$MAJMIN" ]; then
          exit 1
  fi

  Resuming script fails to get device major-minor because
  resume=UUID=106238b0-707d-4422-866d-a7534da50702 -- it's not resolved
  into device path in init script.

  Commonly mentioned workaround is to explicitly specify kernel
  parameter resume=UUID=106238b0-707d-4422-866d-a7534da50702 -- only in
  this case init script resolves it to device path.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: initramfs-tools 0.130ubuntu3
  Uname: Linux 4.16.6-041606-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat May  5 11:32:31 2018
  InstallationDate: Installed on 2018-03-27 (38 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180327)
  PackageArchitecture: all
  SourcePackage: initramfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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