Re: guix system init with mounted btrfs

[Efraim Flashner <efraim@flashner.co.il>]

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On Mon, Jun 24, 2019 at 10:54:37AM -0700, Matt Huszagh wrote:
> Efraim Flashner <efraim@flashner.co.il> writes:
> > I spent some time yesterday with the arch wiki and I have an idea.
> > assuming you're using %desktop-services, inside services:
> >
> > (modify-services %desktop-services
> >   (udev-service-type config =>
> >                      (udev-configuration
> >                      (inherit config)
> >                      (rules (list lvm2 fuse alsa-utils crda btrfs)))))
> >
> > Perhaps adding the udev rules for btrfs will force it to run 'btrfs
> > device scan' or whatever the magic is that it apparently isn't running
> > now.
> 
> Efraim, is btrfs supposed to btrfs-progs here? I believe rules takes
> package names right? In any event I tried this and it didn't work for me.
> Did you have success with it?
> 

I haven't tried it yet, I'm somehow running low on physical machines and
I haven't set up a VM to test it yet. The two places I remember seeing
something about it was with Gentoo¹ and with Arch², which is where I got
the udev suggestion for btrfs, from the 64-btrfs.rule file.

¹ https://forums.gentoo.org/viewtopic-t-1010878.html
² https://bbs.archlinux.org/viewtopic.php?id=189845

> On Mon, Jun 24, 2019 at 7:51 AM Matt Huszagh <huszaghmatt@gmail.com> wrote:
> 
> > Efraim Flashner <efraim@flashner.co.il> writes:
> > > I spent some time yesterday with the arch wiki and I have an idea.
> > > assuming you're using %desktop-services, inside services:
> > >
> > > (modify-services %desktop-services
> > >   (udev-service-type config =>
> > >                      (udev-configuration
> > >                      (inherit config)
> > >                      (rules (list lvm2 fuse alsa-utils crda btrfs)))))
> > >
> > > Perhaps adding the udev rules for btrfs will force it to run 'btrfs
> > > device scan' or whatever the magic is that it apparently isn't running
> > > now.
> >
> > Thanks for the suggestion Efraim. I don't currently use desktop
> > services, just base-services at the moment. However, I'm concerned there
> > may still be an issue with this modification. I'm currently only getting
> > prompted for 1 of 2 LUKS device passphrases, which I believe is an issue
> > with the grub bootloader (which in my case is an efi shell program). I'm
> > getting stuck at the grub rescue prompt and so I don't even get to the
> > initial ramdisk stage. Is that where these services kick in, or does
> > that happen later when the full kernel is loaded? When I mount the btrfs
> > root fs manually, I have to decrypt both devices before I can run btrfs
> > device scan.
> >
> > To address the grub issue I've tried doing:
> > grub rescue> insmod luks
> > grub rescue> cryptomount -a
> >
> > However, that doesn't appear to have any effect. I've also tried
> > modifying grub.cfg directly and reinstalling the bootloader by chrooting
> > and running grub-install, but that doesn't work for reasons that seem to
> > be related to the guix way of doing things. Since I'm still new to Guix,
> > I don't know how one might make custom modifications to the cfg file.
> >
> 
> 
> -- 
> 
> *Matt Huszagh*
> Emerging Markets Trader | JP Morgan
> 
> o: (212) 834-4869
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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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