75 lines
2.1 KiB
Markdown
75 lines
2.1 KiB
Markdown
# Laser NixOS
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Nix expressions for building a NixOS image for the Raspberry Pi 3 controlling the laser cutter in CCCHH.
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## TL;DR
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```shell
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export \
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MACHINE=raspberry-pi-3 \
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SD_CARD=/dev/sda \
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NIXPKGS_REV=dba4149
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nix-build -I nixpkgs="https://github.com/NixOS/nixpkgs/archive/${NIXPKGS_REV}.tar.gz" -I machine=machines/$MACHINE --out-link out-links/$MACHINE
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```
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## Building
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The ISO must be built by emulation if you are not building on an aarch64 machine.
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Build your host NixOS with the following in the configuration.
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```nix
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boot.binfmt.emulatedSystems = [
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"aarch64-linux"
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];
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```
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### Machines
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Select one of the [machines](./machines/) and set the environment variable.
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```shell
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export MACHINE=raspberry-pi-3
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```
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### `nixpkgs` Versions
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Select a [nixpkgs](https://github.com/NixOS/nixpkgs/) version and set the enviroment variable.
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```shell
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export NIXPKGS_REV=dba4149
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```
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It's recommended to set it to one of the revision hashes from the table below.
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But you can also set it to a branch name like `nixos-24.05`.
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| ref | rev | date |
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|-------------|-----------|------------|
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| nixos-24.05 | `dba4149` | 2024-11-07 |
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### Build
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```shell
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nix-build -I nixpkgs="https://github.com/NixOS/nixpkgs/archive/${NIXPKGS_REV}.tar.gz" -I machine=machines/$MACHINE --out-link out-links/$MACHINE
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```
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## Flashing
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Select the correct block device and set the environment variable.
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```shell
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export SD_CARD=/dev/sda
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sudo sh -c "zstd -dcf out-links/$MACHINE/sd-image/*.img.zst | dd status=progress bs=64k iflag=fullblock oflag=direct of=$SD_CARD && sync && eject $SD_CARD"
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```
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## Deployment
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For deploying new images without reflashing, you can use [NixOps](https://github.com/NixOS/nixops).
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```shell
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nix-shell -p nixops_unstable_minimal
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```
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Since stable NixOps reuqires Python2, we use the unstable version.
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```shell
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[nix-shell:~]$ nixops --version
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NixOps 1.7-unstable-2024-02-28-pre-08feccb
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```
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### Create
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```shell
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nixops create -I nixpkgs="https://github.com/NixOS/nixpkgs/archive/${NIXPKGS_REV}.tar.gz" -I machine=machines/$MACHINE
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```
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### Deploy
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```shell
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nixops deploy -I nixpkgs="https://github.com/NixOS/nixpkgs/archive/${NIXPKGS_REV}.tar.gz" -I machine=machines/$MACHINE
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```
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