[Bug 959790] Re: grub-mkrelpath produce incorrect paths if /boot is a bind mount

[Kasper Dupont]

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Title:
  grub-mkrelpath produce incorrect paths if /boot is a bind mount

Status in “grub2” package in Ubuntu:
  New

Bug description:
  grub-mkconfig uses grub-mkrelpath to find out which paths to put in
  grub.cfg, but in some cases grub-mkrelpath produce an incorrect
  output.

  If / and /boot are both mountpoints of different directories from the
  same physical file system, grub-mkrelpath will use the wrong entry
  from /proc/self/mountinfo. It should use the entry for /boot to
  produce the correct path, but it picks the entry for / when given a
  path under /boot.

  For example if /proc/self/mountinfo contains:
  20 1 8:1 /lucid / rw,relatime - ext4 ....
  26 20 8:1 /boot /boot rw,relatime - ext4 ....

  Then running "grub-mkrelpath /boot/grub" outputs /lucid/boot/grub, but
  it should have output /boot/grub.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: grub-common 1.99~rc1-13ubuntu3 [modified: usr/bin/grub-mkrelpath]
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Tue Mar 20 00:00:30 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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