[Bug 1751554] [NEW] os-prober: generates buggy btrfs entries in grub.cfg

[Achim Bohnet]

Public bug reported:

17.10 & 16.04: Choosing a grub menu entry that references a parallell
installed ubuntu system on a btrfs FS does not work.

I've installed neonuser (xenial based distro) in parallel to Kubuntu artful.
It's mounted via

UUID=879cfb57-f580-4326-a2fe-8dc83e0013f4 /os-neon-user   btrfs   defaults,subvol=@ 0       2
UUID=879cfb57-f580-4326-a2fe-8dc83e0013f4 /os-neon-user/home btrfs defaults,subvol=@home 0       2

Running update-grub on artful generates grub.cf entries like for the
Neon User system:

..
               linux /boot/vmlinuz-4.13.0-32-generic root=/dev/sda3
               initrd /boot/initrd.img-4.13.0-32-generic
..

with does not work.

Workaround: Edit the entry to

               linux /@/boot/vmlinuz-4.13.0-32-generic root=/dev/sda3  rootflags=subvol=@
                initrd /@/boot/initrd.img-4.13.0-32-generic

Boots the other ubuntu OS on the btrfs filesys.


I can reproduce the bug on two systems (desktop with xenial, laptop with artful)


The grub.cfg entry of the currently booted OS on a btrfs FS is okay.  So update-grub handles
/ on btrfs okay.  But os-prober on /whatever with btrfs does not.

Achim

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: os-prober 1.74ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
NonfreeKernelModules: openafs wl
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Feb 25 10:55:13 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-01-13 (42 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: os-prober (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

** Attachment added: "grub.cfg with buggy os-proper entry for NeonUser on btrfs"
   https://bugs.launchpad.net/bugs/1751554/+attachment/5062352/+files/grub.cfg

** Summary changed:

- os-prober: generated buggy btrfs entries in grub.cfg
+ os-prober: generates buggy btrfs entries in grub.cfg

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https://bugs.launchpad.net/bugs/1751554

Title:
  os-prober: generates buggy btrfs entries in grub.cfg

Status in os-prober package in Ubuntu:
  New

Bug description:
  17.10 & 16.04: Choosing a grub menu entry that references a parallell
  installed ubuntu system on a btrfs FS does not work.

  I've installed neonuser (xenial based distro) in parallel to Kubuntu artful.
  It's mounted via

  UUID=879cfb57-f580-4326-a2fe-8dc83e0013f4 /os-neon-user   btrfs   defaults,subvol=@ 0       2
  UUID=879cfb57-f580-4326-a2fe-8dc83e0013f4 /os-neon-user/home btrfs defaults,subvol=@home 0       2

  Running update-grub on artful generates grub.cf entries like for the
  Neon User system:

  ..
                 linux /boot/vmlinuz-4.13.0-32-generic root=/dev/sda3
                 initrd /boot/initrd.img-4.13.0-32-generic
  ..

  with does not work.

  Workaround: Edit the entry to

                 linux /@/boot/vmlinuz-4.13.0-32-generic root=/dev/sda3  rootflags=subvol=@
                  initrd /@/boot/initrd.img-4.13.0-32-generic

  Boots the other ubuntu OS on the btrfs filesys.

  
  I can reproduce the bug on two systems (desktop with xenial, laptop with artful)

  
  The grub.cfg entry of the currently booted OS on a btrfs FS is okay.  So update-grub handles
  / on btrfs okay.  But os-prober on /whatever with btrfs does not.

  Achim

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: os-prober 1.74ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  NonfreeKernelModules: openafs wl
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sun Feb 25 10:55:13 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-01-13 (42 days ago)
  InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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