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Published 20 hours ago • verified publisher icon nix-community

Configuration does not persist across reboots

Open SED4906 opened this issue 1 year ago • 7 comments

I'm not sure if this is actually just user error, but the process I attempted was:

  1. Build an SD image using an installation of Nix under Raspberry Pi OS on a different SD card
  2. Write the image to the target SD card and boot from it
  3. Log in as root and notice there's nothing in /etc/nixos/ so I run nixos-generate-config
  4. The generated config has GRUB enabled for some reason
  5. nixos-rebuild switch fails because flakes aren't enabled (???)
  6. Enable flakes in root's per-user nix.conf
  7. A different error about not finding nixos-config
  8. nixos-rebuild -I nixos-config=/etc/nixos/configuration.nix switch
  9. After rebooting the configuration does not persist This is on a Raspberry Pi 5

SED4906 avatar Jul 26 '24 13:07 SED4906

Hi, this does sound like a user error.

It sounds like you generated a default config in (3) that does not import raspberry-pi-nix, then switched. If that's correct, then a failure is expected.

This project supports and uses the default raspberry pi boot process, so you will need to switch to configurations that handle that appropriately. This project does handle that appropriately, so importing it remains important after the initial sd card image is written.

Some of what you mentioned is related to https://github.com/nix-community/raspberry-pi-nix/discussions/32, so you may find that discussion interesting.

tstat avatar Jul 26 '24 13:07 tstat

how do I import raspberry-pi-nix in this case?

SED4906 avatar Jul 26 '24 16:07 SED4906

what does a working configuration.nix look like?

SED4906 avatar Jul 26 '24 16:07 SED4906

The readme links the example repo https://github.com/tstat/raspberry-pi-nix-example/tree/master.

tstat avatar Jul 26 '24 16:07 tstat

so I just have to use a flake.nix?

SED4906 avatar Jul 26 '24 16:07 SED4906

I haven't tried to use this flake in a while, but an update: after booting the built system, I put an adapted version of the example config in the README in /etc/nixos/flake.nix and ran nixos-rebuild switch, and it tried to rebuild everything again. Including the kernel. I couldn't get it to not do that after multiple attempts, so I gave up.

SED4906 avatar Aug 01 '24 11:08 SED4906

Did you include the flake.lock file from this repo? Otherwise the rebuild will build against the then-current version of nixpkgs, which will be different from the one this repo is locked to.

mroi avatar Aug 01 '24 12:08 mroi