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Arbiel Perlacremaz | 18 Feb 2012 00:53
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Booting grml from the iso file itself

Hi

I downloaded grml96_2011.12.iso and I would be glad to boot this file 
without having to burn a CD or to write it down to a USB stick.

I've already done this for Ubuntu distros and for Clonezilla, and I 
found it very helpful.

I've been through the iso file to look for the grub.cfg file and I found 
out that I could write a little grub.cfg file of my own to launch 
grub.cfg which resides in the iso file. I got the menu generated by the 
following lines

for config in /boot/grub/*_default.cfg ; do source "$config" ; done
for config in /boot/grub/*_options.cfg ; do source "$config" ; done
source /boot/grub/addons.cfg

and I choose the first entry, grml32. The boot process than proceded 
until I got an error message stating that

BOOT failed
grml32 2011.12 Release Codename Knecht Rootrecht [2011-12-23]

And the explanation was

Unable to find a medium containing a live file system.

I suppose this message results from the fact that I've not been able to 
correctly set the iso_path and the kernelopts variables which are used 
as parameters of the linux command of the menuentry command.
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Ulrich Dangel | 18 Feb 2012 01:06
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Re: Booting grml from the iso file itself

* Arbiel Perlacremaz wrote [18.02.12 00:53]:

> I downloaded grml96_2011.12.iso and I would be glad to boot this
> file without having to burn a CD or to write it down to a USB stick.

> function iso_virtuel {
> search --file --set=root --no-floppy /${2}
> loopback iso ${1}${2}
> }
> 
> menuentry 'grmliso' {
> iso_virtuel / "grml96_2011.12.iso"
> set root=(iso)
> set iso_path=(iso)
> configfile /boot/grub/grub.cfg
> }

The problem is probably that you have to export the iso path otherwise
the exported values won't be availabe in the other grub configs. This
means you have to add export iso_path to your menu entry.

There are other small issues you should also be aware of:

1) You should use loopback.cfg instead of grub.cfg as loopback.cfg is a
more standardized way e.g. ubuntu also supports loobpack.cfg
2) The released grml96 iso image has a wrong grub config (i think you
only can boot either grml64 or grml32). You should generate your own
grub config with the current grml2usb itself.

Ulrich
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Michael Prokop | 18 Feb 2012 07:55
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Re: Booting grml from the iso file itself

* Ulrich Dangel [Sat Feb 18, 2012 at 01:06:52AM +0100]:

> 2) The released grml96 iso image has a wrong grub config (i think you
> only can boot either grml64 or grml32). You should generate your own
> grub config with the current grml2usb itself.

Yeah, it's http://bts.grml.org/grml/issue1134
and already fixed in the daily ISOs and for the upcoming stable
release.

JFYI

regards,
-mika-

* Ulrich Dangel [Sat Feb 18, 2012 at 01:06:52AM +0100]:

> 2) The released grml96 iso image has a wrong grub config (i think you
> only can boot either grml64 or grml32). You should generate your own
> grub config with the current grml2usb itself.

Yeah, it's http://bts.grml.org/grml/issue1134
and already fixed in the daily ISOs and for the upcoming stable
release.

JFYI

regards,
-mika-
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