[Bug 721560] Re: grub-mkrescue: paths/disks are not updated in grub.cfg

[Marcus Tomlinson]

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** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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Title:
  grub-mkrescue: paths/disks are not updated in grub.cfg

Status in grub:
  New
Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: grub2

  Hello,
  Ubuntu (grub2 1.99) is installed on a Usb drive.
  I needed to create a boot cd for my system since the boot disk is failing more and more and I have NO USB BIOS support.

  1. So after installation, I ran with root rights:
  grub-mkrescue --output=cd.iso /boot
  In that case, I get the image with inside:
  /boot/grub/i386-pc/ {grub.cfg, eltorito.img & the modules}
  /{kernel, initrd and the content of my boot folder in the system, INCLUDING THE GRUB FOLDER, which become in the image /grub

  /boot/grub/i386-pc/ grub.cfg text is:
  insmod part_acorn
  insmod part_amiga
  insmod part_apple
  insmod part_bsd
  insmod part_gpt
  insmod part_msdos
  insmod part_sun
  insmod part_sunpc
  source /boot/grub/grub.cfg

  However, as told above, the original grub.cfg image from my system is
  on the CD in /grub/grub.cfg. So it IS NOT SOURCED BY GRUB AND I GET
  DIRECTLY TO THE CLI WHILE BOOTING.

  2. I tried:
  sudo grub-mkrescue --output=cd.iso /boot/grub
  In that case, I get the image with inside:
  /boot/grub/i386-pc/ {grub.cfg, eltorito.img & the modules}
  /{the content of my system's boot/grub folder, i.e. modules and grub.cfg at the root of my CD.}.
  So it is not sourced by the command "source /boot/grub/grub.cfg" in the default file read by the eltorito.img core.

  3. To get the right path (/boot/grub/grub.cfg) for my system's file (/boot/grub/grub.cfg), I tried
  sudo grub-mkrescue --output=cd.iso /
  i get:
  ---------------------------------
  aure at aure-VGN-A517B:/$ sudo grub-mkrescue --output=/root/cd.iso /
  Enabling BIOS support ...
  xorriso 0.5.6 : RockRidge filesystem manipulator, libburnia project.

  xorriso : FAILURE : Cannot determine attributes of source file ''
  xorriso : sys   : No such file or directory
  ----------------------------------
  I do not understand these messages...

  4. SOLUTION:
  I copied the /boot folder in a temporary other folder, let's say /root/ttt
  I use this folder in the command:

  sudo grub-mkrescue --output=cd.iso /root/ttt

  that way I get on the cd my original system's grub.cfg in
  /boot/grub/grub.cfg.

  
  -> Therefore, the grub-mkrescue command should adapt the source command to access the right file parsing the path passed as an argument.
  -> The command should also include any required file (unicode.pf2, gfx etc.) inside the CD and change the references of the grub.cfg file to point to the CD's files. But as I state in the bug (721545), any file should be copied in /boot to eliminate all the problems of accessible files at once and solve all.

  Thank you, I do not know C a lot so cannot play with that.

  PS: May be somehow linked to the bug I just reported (721545) which
  highlights that the paths management is sometimes wrong, but this can
  be solved separately since it copies the system grub.cfg.

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