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tips&tricks: expanded wifi notes

Aly Raffauf 2024-06-10 14:22:24 -04:00
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Tips & Tricks.md

@ -8,14 +8,22 @@
7. Rebuild the new system from git. Secrets will be automatically decrypted and immediately available in `/run/agenix/`.
8. (OPTIONAL) Generate a new user SSH key and add it to `nixosModules/users/default.nix` in order to enable passwordless logins to other hosts.
## WiFi
## Declarative WiFi Connections
WiFi networks can be configured declratively in `nixosModules/system/wifi.nix` using `networking.networkmanager.ensureProfiles.profiles`, provided by nixpkgs.
WiFi networks can be configured declaratiely in `nixosModules/system/wifi.nix` using `config.networking.networkmanager.ensureProfiles.profiles`, provided by nixpkgs.
### Generating WiFi Profiles
[nm2nix](https://github.com/janik-haag/nm2nix) can generate nix-compatible code for all the WiFi networks in `/etc/NetworkManager/system-connections/` and `/run/NetworkManager/system-connections`.
[nm2nix](https://github.com/janik-haag/nm2nix) can generate nix code for all WiFi networks currently configured in `/etc/NetworkManager/system-connections/` and `/run/NetworkManager/system-connections` with the following command:
```bash
sudo su -c "cd /etc/NetworkManager/system-connections && nix --extra-experimental-features 'nix-command flakes' run github:Janik-Haag/nm2nix | nix --extra-experimental-features 'nix-command flakes' run nixpkgs#nixfmt-rfc-style"
```
[[Secrets]] (passwords, certificates, and identities) are supported, but must be declared and available as variables with agenix. They will be replaced upon activation with `envsubst`.
In short,
1. Manually configure the WiFi network on one device.
1. Export configuration to nix with `nm2nix`.
1. Add secrets to `secrets/wifi.age` as variables (e.g. `MYPSK=1234567890`)
1. Edit the code generated by `nm2nix` to reference `$MYPSK` instead of directly declaring the WPA password.
1. Commit and push changes.
1. Rebuild hosts as required to propogate your new WiFi configuration.