Re: Guix System ext4 index full

[Tobias Geerinckx-Rice <me@tobias.gr>]

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Roel,

Roel Janssen 写道：
> Thanks for the suggestion.  So I did:
> $ tune2fs -O large_dir /dev/sdd3
>
> .. and after a reboot I get booted into a GRUB resque shell.

Shart.  It seems that GRUB still[0] can't read ext4 file systems 
with features newer than 2017 :-/  I'll never recommend this again 
(I use it myself…).

The flag can't be cleared once set:

  $ sudo tune2fs -O ^large_dir img
  tune2fs 1.45.6 (20-Mar-2020)
  Clearing filesystem feature 'large_dir' not supported.

Your data's perfectly safe.  This is just a GRUB limitation.

> So.. do you have a suggestion for how I could boot into the Guix 
> system
> again?

I think realistic options are:

- Migrate to any other file system like btrfs, then use the live 
  USB's GRUB to bootstrap it using ‘configfile 
  (hdX,Y)/your/grub.cfg’ so you don't have to reinstall anything, 
  just copy.  This can even be done-in place[1], assuming you have 
  back-ups.

- Use a separate /boot partition if you want to keep using ext4 
  for large /gnus.  You'll have to manually copy each kernel & 
  friends to /boot but this can be automated in your system .scm.

> After booting from a live USB, I chrooted into the Guix system 
> and when
> running the following command, I get the following error:
> $ guix system reconfigure /etc/config.scm
> ...
> guix system: error: while setting up the build environment: 
> cannot
> pivot old root directory onto
> '/gnu/store/4q1vpidsawmfhmqdwy4mxvjc720jxcjm-slim-
> 1.3.6.drv.chroot/real-root': Invalid argument

I think your in-chroot guix is talking to the live system's 
guix-daemon.  Perhaps stopping the out-of-chroot daemon and 
starting a ‘guix-daemon --disable-chroot’ inside the chroot will 
work.

Kind regards,

T G-R

[0]: https://savannah.gnu.org/bugs/?56897
[1]: https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-convert

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