[Bug 604335] Re: grub-pc.postinst script fails to detect virtio vda disk in KVM guest

[nutznboltz]

** Description changed:

+ A statement explaining the impact of the bug on users and justification
+ for backporting the fix to the stable release: Multiple people report
+ they cannot install grub2 on virtio disk on Ubuntu 10.04 LTS
+ 
+ An explanation of how the bug has been addressed in the development
+ branch, including the relevant version numbers of packages modified in
+ order to implement the fix.: Fixed (at least) in udev 167-0ubuntu3 in
+ Natty 11.04
+ 
+ 
+ A minimal patch applicable to the stable version of the package. If preparing a patch is likely to be time-consuming, it may be preferable to get a general approval from the SRU team first.: see provided patch
+ 
+ Detailed instructions how to reproduce the bug. These should allow
+ someone who is not familiar with the affected package to reproduce the
+ bug and verify that the updated package fixes the problem. Please mark
+ this with a line "TEST CASE:": See discussion
+ 
+ 
+ A discussion of the regression potential of the patch and how users could get inadvertently affected.: only two additional lines of udev rules and only affects /dev/vd* devices.
+ 
  Binary package hint: grub-pc
  
  The grub-pc.postinst script fails to detect virtio "vda" disk in a KVM
  guest because it looks for entries in /dev/disk/by-id/* and there is
  absolutely no /dev/disk/by-id directory at all when the only disk is a
  vda virtio one.
  
  You can test this either by creating a new KVM VM guest running Ubuntu
  10.04 with only virtio vda disk or by converting an existing hda disk VM
  guest into a vda one and then trying to purge and re-install grub-pc.
  
  If the KVM VM guest running Ubuntu 10.04 is configured to boot from LVM
  this issue is not seen; the failure requires a guest with a bare
  /dev/vda disk.
  
  Applying the patch (attached) to grub-pc.postinst in the KVM VM guest
  allows you to install (or re-install) grub-pc; without it the grub-pc
  package will not configure.
  
  Patch is against grub-pc 1.98-1ubuntu6
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: grub-pc 1.98-1ubuntu6
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sun Jul 11 12:15:58 2010
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2

** Description changed:

  A statement explaining the impact of the bug on users and justification
  for backporting the fix to the stable release: Multiple people report
  they cannot install grub2 on virtio disk on Ubuntu 10.04 LTS
  
  An explanation of how the bug has been addressed in the development
  branch, including the relevant version numbers of packages modified in
  order to implement the fix.: Fixed (at least) in udev 167-0ubuntu3 in
  Natty 11.04
  
- 
- A minimal patch applicable to the stable version of the package. If preparing a patch is likely to be time-consuming, it may be preferable to get a general approval from the SRU team first.: see provided patch
+ A minimal patch applicable to the stable version of the package. If
+ preparing a patch is likely to be time-consuming, it may be preferable
+ to get a general approval from the SRU team first.: see provided patch
  
  Detailed instructions how to reproduce the bug. These should allow
  someone who is not familiar with the affected package to reproduce the
  bug and verify that the updated package fixes the problem. Please mark
- this with a line "TEST CASE:": See discussion
+ this with a line "TEST CASE:": on KVM/qemu with /dev/vda only try
+ running "dpkg-reconfigure grub-pc" the scripts in that package will fail
+ because /dev/disk/by-id does not exist due to missing udev rules.
  
- 
- A discussion of the regression potential of the patch and how users could get inadvertently affected.: only two additional lines of udev rules and only affects /dev/vd* devices.
+ A discussion of the regression potential of the patch and how users
+ could get inadvertently affected.: only two additional lines of udev
+ rules and only affects /dev/vd* devices.
  
  Binary package hint: grub-pc
  
  The grub-pc.postinst script fails to detect virtio "vda" disk in a KVM
  guest because it looks for entries in /dev/disk/by-id/* and there is
  absolutely no /dev/disk/by-id directory at all when the only disk is a
  vda virtio one.
  
  You can test this either by creating a new KVM VM guest running Ubuntu
  10.04 with only virtio vda disk or by converting an existing hda disk VM
  guest into a vda one and then trying to purge and re-install grub-pc.
  
  If the KVM VM guest running Ubuntu 10.04 is configured to boot from LVM
  this issue is not seen; the failure requires a guest with a bare
  /dev/vda disk.
  
  Applying the patch (attached) to grub-pc.postinst in the KVM VM guest
  allows you to install (or re-install) grub-pc; without it the grub-pc
  package will not configure.
  
  Patch is against grub-pc 1.98-1ubuntu6
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: grub-pc 1.98-1ubuntu6
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sun Jul 11 12:15:58 2010
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2

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https://bugs.launchpad.net/bugs/604335

Title:
  grub-pc.postinst script fails to detect virtio vda disk in KVM guest

Status in “grub2” package in Ubuntu:
  Triaged

Bug description:
  A statement explaining the impact of the bug on users and
  justification for backporting the fix to the stable release: Multiple
  people report they cannot install grub2 on virtio disk on Ubuntu 10.04
  LTS

  An explanation of how the bug has been addressed in the development
  branch, including the relevant version numbers of packages modified in
  order to implement the fix.: Fixed (at least) in udev 167-0ubuntu3 in
  Natty 11.04

  A minimal patch applicable to the stable version of the package. If
  preparing a patch is likely to be time-consuming, it may be preferable
  to get a general approval from the SRU team first.: see provided patch

  Detailed instructions how to reproduce the bug. These should allow
  someone who is not familiar with the affected package to reproduce the
  bug and verify that the updated package fixes the problem. Please mark
  this with a line "TEST CASE:": on KVM/qemu with /dev/vda only try
  running "dpkg-reconfigure grub-pc" the scripts in that package will
  fail because /dev/disk/by-id does not exist due to missing udev rules.

  A discussion of the regression potential of the patch and how users
  could get inadvertently affected.: only two additional lines of udev
  rules and only affects /dev/vd* devices.

  Binary package hint: grub-pc

  The grub-pc.postinst script fails to detect virtio "vda" disk in a KVM
  guest because it looks for entries in /dev/disk/by-id/* and there is
  absolutely no /dev/disk/by-id directory at all when the only disk is a
  vda virtio one.

  You can test this either by creating a new KVM VM guest running Ubuntu
  10.04 with only virtio vda disk or by converting an existing hda disk
  VM guest into a vda one and then trying to purge and re-install grub-
  pc.

  If the KVM VM guest running Ubuntu 10.04 is configured to boot from
  LVM this issue is not seen; the failure requires a guest with a bare
  /dev/vda disk.

  Applying the patch (attached) to grub-pc.postinst in the KVM VM guest
  allows you to install (or re-install) grub-pc; without it the grub-pc
  package will not configure.

  Patch is against grub-pc 1.98-1ubuntu6

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: grub-pc 1.98-1ubuntu6
  ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sun Jul 11 12:15:58 2010
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2

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