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felschr's NixOS configuration

Installation

Clone the configuration into /etc/nixos.

On a new machine run:

scripts/setup-partitions

Then move the resulting /mnt/etc/nixos/hardware-configuration.nix to ./hardware/<config>.nix. Update the configuration according to the script output, if necessary. Btrfs mount options likely need to be added, for example. Copy the configuration from /etc/nixos to /mnt/etc/nixos.

Reference this hardware config in a nixosConfigurations.<config> section in flake.nix.

Now set up a device key that will be used by agenix. Create a new key and re-encrypt the secrets on an existing device & pull the changes.
To create a new key run:

mkdir -p /mnt/etc/secrets/initrd
ssh-keygen -t ed25519 -N "" -f /mnt/etc/secrets/initrd/ssh_host_ed25519_key

You will likely need to temporarily set age.identityPaths for the installation to succeed:

age.identityPaths = "/etc/secrets/initrd/ssh_host_ed25519_key";

To install run the following command where <config> matches outputs.nixosConfigurations.<config> in flake.nix:

nixos-install --flake '/mnt/etc/nixos#<config>'

After the installation finished, set a password for the user:

passwd <user>

Updating

Update all flake inputs:

nix flake update

Update a specific flake input:

nix flake lock --update-input <input>

Rebuilding the system

Rebuild the system:

sudo nixos-rebuild switch

Rebuild the system for a remote machine:

sudo nixos-rebuild switch --flake '/etc/nixos#<config>' --target-host user@hostname --use-remote-sudo