# jalr's NixOS Configuration

## Install a new host

This installs nixos on host `somehost`:

### NixOS Anywhere

```bash
nix run github:nix-community/nixos-anywhere -- --flake .#<somehost> root@<somehost>
```

### The traditional way

```bash
nix-shell -p nixUnstable --run 'nixos-install --flake https://gitlab.jalr.de/jalr/nixos-configuration#somehost --no-channel-copy'
```

### Build a configuration

```
nix build .#nixosConfigurations.iron.config.system.build.toplevel
```

### setting up sops
Get the host key and convert it.
```bash
ssh-keyscan -t ed25519 $host | ssh-to-age
```

Then add the key to `.sops.yaml`

If the key changed, you might want to run
```bash
sops updatekeys hosts/$host/secrets.yaml
```

## nix repl
start an interactive environment for evaluating Nix expressions

```
$ nix repl

nix-repl> a=builtins.getFlake (toString ./.)
```

```
$ nix repl

nix-repl> :lf .#
```


## Import GPG public key
```
gpg --card-edit
gpg/card> fetch
gpg --edit-key $key
gpg> trust
Your decision? 5
```

## Debugging boot issues

1. Add `rd.systemd.debug_shell` kernel parameter
2. Press CTRL+ALT+F9 to switch to root shell