Hi Efraim,

thanks for helping me!

This is what I see when I run `which -a guix` as a user, and when run via
sudo. I do reconfigure the system with `sudo guix ...`. I used to as root. Not
sure if that matters.

[roman@m1 guix]$ which -a guix
/home/roman/.config/guix/current/bin/guix
/run/current-system/profile/bin/guix
/home/roman/.config/guix/current/bin/guix
/run/current-system/profile/bin/guix

[roman@m1 guix]$ sudo which -a guix
/home/roman/.config/guix/current/bin/guix
/run/current-system/profile/bin/guix
/home/roman/.config/guix/current/bin/guix
/run/current-system/profile/bin/guix

I have no idea if this is good or bad. :)

I don't think I have any `guix` package installed in my profiles. I checked
this with:

guix package -I | grep guix
sudo guix package -I | grep guix

Both profiles also seem to have a recent version of the `guix` cli.

[roman@m1 guix]$ guix --version
guix (GNU Guix) 68edde635d7f60fb48b2b664e55118fdc3021a73

[roman@m1 guix]$ sudo guix --version
guix (GNU Guix) 68edde635d7f60fb48b2b664e55118fdc3021a73

Was your thinking that I may got so far back in time somehow that the `guix`
package I was using did not contain the `efi-bootloader-chain` variable, and
thus `lookup-bootloader-by-name` could not find it?

Good idea, I haven't even thought of that. :)

But I think that's not the case here, isn't it?

Do you have any other ideas?

Thanks, Roman.

Efraim Flashner <efraim@flashner.co.il> writes:

> On Fri, Sep 27, 2024 at 08:16:16AM +0200, Roman Scherer wrote:
>> 
>> Hello Guix,
>> 
>> I'm using a Guix system with the efi-bootloader-chain [1]. The chain
>> loads m1n1 (the Asahi Linux boot loader), u-boot and then grub.
>> 
>> A system roll-back used to work fine, but it stopped to work a while
>> ago. I'm not sure when that happened, because I rarley needed to
>> roll-back. But now that I don't have it anymore, I'm a bit nervous.
>> 
>> When I do a roll-back, this is what happens:
>> 
>> ```
>> $ sudo guix system roll-back
>> Password:
>> guix system: error: efi-bootloader-chain: no such bootloader
>> ```
>> 
>> It looks like the efi-bootloader-chain can't be found in the
>> %bootloaders variable of the (gnu bootloader) module. But that seems
>> strange, since it is defined in the same file (just a bit later).
>> 
>> Any ideas?
>> 
>> Thanks, Roman.
>> 
>> [1] https://github.com/asahi-guix/channel/blob/main/modules/asahi/guix/bootloader/m1n1.scm
>
> What do you get from `which -a guix`? Make sure you haven't installed
> guix (the package) into a profile and are slowly making your way
> backwards in time each time you reconfigure.