nixos-pi-zero-2's Introduction

Building a NixOS SD image for a Raspberry Pi Zero 2 w

Update zero2w.nix

In particular, don't forget:

to configure your wifi
to add an admin user able to connect through ssh

Build the image

nix build -L .#nixosConfigurations.zero2w.config.system.build.sdImage

Copy the image in your sd card

DEVICE=/dev/disk5 # Whatever your sd card reader is
sudo dd if=result/sd-image/zero2.img of=$DEVICE bs=1M conv=fsync status=progress

Boot your Zero
Get your IP

ifconfig wlan0

From another machine, rebuild the system:

ZERO2_IP=<the-zero2-ip>
SSH_USER=<the-admin-user-in-the-pi>
nix run github:serokell/deploy-rs .#zero2w -- --ssh-user $SSH_USER --hostname $ZERO2_IP

Notes

The Zero 2 doesn't have enough RAM to build itself. An initial lead was to create a swap partition, but it turns out it was a bad idea, as it would have decreased the sd card lifetime (sd cards don't like many write operations). A zram swap is not big enough to work. Hence the use of deploy-rs.
- Note that nixos-rebuild --target-host would work instead of using deploy-rs. but as nixos-rebuild is not available on Darwin, I'm using deploy-rs that works both on NixOS and Darwin.
I still couldn't find a way to use boot.kernelPackages = pkgs.linuxKernel.packages.linux_rpi3.
the sdImage.extraFirmwareConfig option is not ideal as it cannot update config.txt after it is created in the sd image.

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nixos-pi-zero-2's Issues

Question: Building from x86_64-linux

Curious to try building this from a linux box! Any pointers to updated resources on how to work around the following?

~/nixos-config main *+                                                                                                                                                                                                                                                                                                   
❯ nix build -L .#nixosConfigurations.zero2w.config.system.build.sdImage
error: a 'aarch64-linux' with features {} is required to build
'/nix/store/dg8m1dlmqb9i11290ywlan5bwmj49fdf-config.txt.drv', 
but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test}

Best regards,
Torgeir

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