[Bug 243783] Re: update-grub fails to detect correct kernel_dir

[dino99]

outdated report & no more maintained distro; please send a new one if
that issue still exist (using ubuntu-bug)

** Changed in: grub (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/243783

Title:
  update-grub fails to detect correct kernel_dir

Status in grub package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: grub

  in a setup where a boot partition is shared among different unices,
  all having their own subdirectory there (let's say the boot partition
  is /dev/sda3 mounted on /mnt/boot; in that case ubuntu hardy's /boot
  is a symlink to /mnt/boot/ubuntu-stable), update-grub fails to detect
  the kernel_dir correctly.

  as a result, the /mnt/boot/ubuntu-stable/grub/menu.lst (which is
  intended to be read via configfile by a distribution chooser grub
  installation on /mnt/boot/grub) claims that the kernel resides in
  (hd0,2)/boot/ instead of (hd0,2)/ubuntu-stable/.

  the desired behavior would be to resolve all symlinks in the path of
  the kernel image found as /boot/vmlinuz-x resulting in /mnt/boot
  /ubuntu-stable/vmlinuz-x, then determine the partition it resides on
  (this is done correctly in my case) and find that kernel's path
  relative to the mount point, which will be the abolute path on (hd0,2)
  where grub has to look for the kernel. (it goes without saying that
  the same is true for initrd images)

  the issue can be temporarily mitigated by inserting a "kernel_dir
  =/ubuntu-stable" in line 1283 of /usr/sbin/update-grub, but that's a
  rather brutal workaround.

  observed on ubuntu hardy with grub 0.97-29ubuntu21.

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