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Re: boot multiple Gnu/Linux Distributions from one USB key

From: gnuforever
Subject: Re: boot multiple Gnu/Linux Distributions from one USB key
Date: Wed, 13 Mar 2019 06:24:59 +0100
User-agent: Roundcube Webmail/1.0.2

On 12.03.2019 11:34, Tobias Geerinckx-Rice wrote:
You'll also note that Debian-based distributions use a completely different magic word:

 linux … iso-scan/filename=$isofile …

Indeed. For Trisquel, libreboot, I have this:

       ## TRISQUEL
       menuentry "Trisquel 7.0 - Gnu/Linux" {
           set isofile="/boot-isos/trisquel_7.0_amd64.iso"
           loopback loop (usb0,msdos1)$isofile
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile noprompt noeject timezone=Europe/Brussels
           initrd (loop)/casper/initrd

I wonder if MAPPED-DEVICES could be a solution here, with a bit (heh) of extra code…

Unfortunately, I am not a lisp programmer. Not a programmer at all :-)
I do some lisp in my emacs config files but just for emacs customization. Code I found from other emacs users or sometimes with the emacs customization wizard.

TL;DR: there is no one reliable way, only distro-specific support.
Does this mean that ,for the moment, I can not add Guix to my multiple boot usb key?

On 12.03.2019 14:05, Ricardo Wurmus wrote:
Does a partition with this label exist?

Yes, it exists. If I dd the guix install iso into a usb and boot from it, the /dev/sr0 which is the is it booted from has "GUIXSD_IMAGE" as label In fact, the default embeded grub.cfg in the guix iso looks like this, but it uses uuid

        search --fs-uuid --set 1970-01-01-19-16-18-78
linux /gnu/store/0zajbn9q39yva4l0zzrcshlll8qikzba-linux-libre-4.19.6/bzImage9 --system=/gnu/store/l4hgd4l7acrqwi3imav9akcvv4sbj85j-system --load=/gnu/store/l4hgd4l7acrqwi3imav9akcvv4sbj85j-system/boot initrd /gnu/store/9nqaksx40zh5d6cg5rim3f3spy56bfb9-raw-initrd/initrd.cpio.gz

On 12.03.2019 19:56, Vagrant Cascadian wrote:
From the Guix initramfs you would need to run:

  losetup /path/to/file

If the image was in a partitioned loopback file:

  losetup --partscan /path/to/file

Then I suspect the labels would get populated. You may also need to add
losetup to the initramfs, since it probably isn't yet present.

I'm guessing you would also remove the (loop) from these arguments,
which are passed to the Guix initramfs, not loaded from grub:


I will give a try.

Happy Gnu!

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