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nix-community / raspberry-pi-nix

NixOS modules to aid in configuring NixOS for raspberry pi products
MIT License
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Configuration does not persist across reboots #36

Closed SED4906 closed 1 month ago

SED4906 commented 2 months ago

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
tstat commented 2 months ago

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.

SED4906 commented 2 months ago

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

SED4906 commented 2 months ago

what does a working configuration.nix look like?

tstat commented 2 months ago

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

SED4906 commented 2 months ago

so I just have to use a flake.nix?

SED4906 commented 2 months ago

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.

mroi commented 2 months ago

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.