Re: Reinstall GuixSD from another distribution with chroot (Recover Grub)

[ludo@gnu.org (Ludovic Courtès)]

Hi Oleg,

Thanks for sharing your tips.

Oleg Pykhalov <go.wigust@gmail.com> skribis:

> I got a ‘grub.cfg’ with following entries for all system generations:
>
> menuentry "GNU with Linux-Libre 4.15.6 (beta)" {
>   search --label --set magnolia-root
> }

How did you end up with that?  :-)

> Chrooting into GuixSD system:
>
> mkdir /tmp/guixsd
> sudo mount /dev/sda2 /tmp/guixsd # GuixSD partition
> sudo mount -t proc none /tmp/guixsd/proc
> sudo mount -t sysfs sys /tmp/guixsd/sys
> sudo mount -o bind /dev /tmp/guixsd/dev
> sudo mount /dev/sda1 /tmp/guixsd/boot/efi # UEFI partition with ‘EFI’ directory inside
> sudo chroot /tmp/guixsd /bin/sh
>
>
> You need to “source” a Bash profile with environment variables which
> will setup an environment as was GuixSD (such as ‘PATH’ to find
> executables).  The thing is if you make a ‘source /etc/profile’ then
> you cannot get YOUR-USER's profile PATH environment variable.  Because
> of that “source” only a ‘per-user’ profile.
>
> source /var/guix/profiles/per-user/YOUR-USER/guix-profile/etc/profile

Looking at this, I thought we should be able to do a better job to start
an already installed GuixSD, for instance by providing a script that
boots the system.

Actually, I suspect that something like this would work:

  cd /tmp/guixsd
  chroot . /gnu/store/…/bin/guile /run/current-system/boot

With a bit of work, we could make it as simple as:

  /tmp/guixsd/run/current-system/spawn

or similar.

Thoughts?

Ludo’.