nixos-config/flake.nix
Simon Bruder 10b8d432d5
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2024-01-13 14:39:22 +01:00

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Nix

# SPDX-FileCopyrightText: 2021-2024 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
{
description = "NixOS system configuration";
inputs = {
flake-utils.url = "github:numtide/flake-utils";
nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
home-manager.url = "github:nix-community/home-manager/release-23.11";
home-manager.inputs.nixpkgs.follows = "nixpkgs";
home-manager-unstable.url = "github:nix-community/home-manager";
home-manager-unstable.inputs.nixpkgs.follows = "nixpkgs-unstable";
krops.url = "github:Mic92/krops";
krops.inputs.flake-utils.follows = "flake-utils";
krops.inputs.nixpkgs.follows = "nixpkgs";
nixos-hardware.url = "github:nixos/nixos-hardware/master";
nix-pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix/master";
nix-pre-commit-hooks.inputs.flake-utils.follows = "flake-utils";
nix-pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs-unstable";
sops-nix.url = "github:Mic92/sops-nix";
sops-nix.inputs.nixpkgs.follows = "nixpkgs";
infinisilSystem.url = "github:Infinisil/system/9f7cf7497d26d57996edc7f70edcf7d2cccfdf60";
infinisilSystem.flake = false;
nixpkgs-overlay.url = "git+https://git.sbruder.de/simon/nixpkgs-overlay";
nixpkgs-overlay.inputs.flake-utils.follows = "flake-utils";
nixpkgs-overlay.inputs.nixpkgs.follows = "nixpkgs";
nixpkgs-overlay.inputs.nix-pre-commit-hooks.follows = "nix-pre-commit-hooks";
bang-evaluator.url = "git+https://git.sbruder.de/simon/bangs";
bang-evaluator.inputs.flake-utils.follows = "flake-utils";
bang-evaluator.inputs.nixpkgs.follows = "nixpkgs";
password-hash-self-service.url = "git+https://git.sbruder.de/simon/password-hash-self-service";
password-hash-self-service.inputs.flake-utils.follows = "flake-utils";
};
outputs =
{ self
, flake-utils
, krops
, nix-pre-commit-hooks
, nixpkgs
, nixpkgs-overlay
, ...
}@inputs: flake-utils.lib.eachDefaultSystem
(system:
let
pkgs = import nixpkgs { inherit system; };
inherit (pkgs) lib;
in
{
checks = {
pre-commit-check = nix-pre-commit-hooks.lib.${system}.run {
src = self;
hooks = {
black.enable = true;
nixpkgs-fmt.enable = true;
shellcheck.enable = true;
reuse = {
enable = true;
name = "reuse";
entry = "reuse lint";
pass_filenames = false;
};
};
};
};
apps = lib.mapAttrs
(name: program: { type = "app"; program = toString program; })
(flake-utils.lib.flattenTree {
deploy = lib.recurseIntoAttrs (lib.mapAttrs
(hostname: machine:
let
inherit (krops.packages.${system}) writeCommand;
inherit (krops) lib;
in
writeCommand "deploy-${hostname}" {
target = lib.mkTarget "root@${machine.config.deployment.targetHost}" // {
extraOptions = [
# force allocation of tty to allow aborting with ^C and to show build progress
"-t"
];
};
source = lib.evalSource (lib.singleton {
config.file = {
path = toString self;
useChecksum = true;
filters = [
{
type = "include";
pattern = "/machines/${hostname}/";
}
{
type = "exclude";
pattern = "/machines/*/";
}
];
};
});
command = targetPath: ''
nixos-rebuild switch --flake ${targetPath}/config -L --keep-going
'';
}
)
self.nixosConfigurations);
deploy-local = lib.recurseIntoAttrs (lib.mapAttrs
(hostname: machine: pkgs.writeShellScript "deploy-local-${hostname}" ''
set -euo pipefail
SUBSTITUTE="-s"
for i in "$@"; do
case $i in
-S)
SUBSTITUTE=""
;;
esac
done
closure="$(nix build -L --print-out-paths .#nixosConfigurations.${hostname}.config.system.build.toplevel)"
nix copy \
$SUBSTITUTE \
-L \
--to ssh://root@${machine.config.deployment.targetHost} \
"$closure"
ssh root@${machine.config.deployment.targetHost} nix-env -p /nix/var/nix/profiles/system --set ''${closure}
ssh root@${machine.config.deployment.targetHost} ''${closure}/bin/switch-to-configuration switch
return="$?"
if [ "$return" != 0 ]; then
echo "Error(s) occurred while Switching configuration"
exit "$retuen"
fi
'')
self.nixosConfigurations);
unlock = lib.recurseIntoAttrs (lib.mapAttrs
(hostname: machine:
let
inherit (machine.config.deployment)
targetHost
unlockOverV4;
in
pkgs.writeShellScript "unlock-${hostname}" ''
set -exo pipefail
# opening luks fails if gpg-agent is not unlocked yet
pass "devices/${hostname}/luks" >/dev/null
ssh \
${lib.optionalString unlockOverV4 "-4"} \
-p 2222 \
"root@${targetHost}" \
"cat > /crypt-ramfs/passphrase" < <(pass "devices/${hostname}/luks")
'')
self.nixosConfigurations);
showKeyFingerprint = pkgs.writeShellScript "show-key-fingerprint" ''
gpg --with-fingerprint --with-colons --show-key "keys/''${1}.asc" | awk -F: '$1 == "fpr" { print $10; exit }'
'';
});
devShells.default = pkgs.mkShell {
buildInputs = (with pkgs; [
black
nixpkgs-fmt
reuse
shellcheck
sops
ssh-to-pgp
]);
shellHook = ''
find ${./keys} -type f -print0 | xargs -0 ${pkgs.gnupg}/bin/gpg --quiet --import
'' + self.checks.${system}.pre-commit-check.shellHook;
};
}) // {
overlays.default = import ./pkgs;
nixosConfigurations = nixpkgs.lib.mapAttrs
(hostname: { system
, extraModules ? [ ]
, targetHost ? hostname
, unlockOverV4 ? true
, nixpkgs ? inputs.nixpkgs
}: nixpkgs.lib.nixosSystem rec {
inherit system;
modules = [
(./machines + "/${hostname}/configuration.nix")
{
_module.args.inputs = inputs;
}
# deployment settings
({ lib, ... }: {
options.deployment = {
targetHost = lib.mkOption {
type = lib.types.str;
readOnly = true;
internal = true;
};
unlockOverV4 = lib.mkOption {
type = lib.types.bool;
readOnly = true;
internal = true;
description = "Whether to unlock the host over IPv4 (only)";
};
};
config.deployment = {
inherit
targetHost
unlockOverV4;
};
})
] ++ (with inputs; [
# Use newest home-manager for hosts that use unstable, otherwise there are conflicts
(if nixpkgs == inputs.nixpkgs-unstable then home-manager-unstable else home-manager).nixosModules.home-manager
sops-nix.nixosModules.sops
bang-evaluator.nixosModules.bang-evaluator
]) ++ (builtins.attrValues nixpkgs-overlay.nixosModules)
++ extraModules;
})
(import ./machines inputs);
};
}