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nixos/flake.nix
beatzaplentyandClaude Sonnet 4.6 a63e1c70c3 feat(provision): Phase 2 — migrate SSH host keys to clan vars
Replaces the gitignored host-keys/ directory with clan vars as the
authoritative storage for SSH host keys. Keys are now generated as
sops-binary-encrypted clan var files (admin-key only) and checked into
vars/per-machine/<target>/openssh/, eliminating the plaintext private
key that previously had to live outside the repo.

Changes:
- modules/clan/ssh-host-key.nix: clan vars generator for the ed25519
  SSH host key pair (neededFor="activation" — not mapped to sops.secrets,
  delivered via tarball baking for LXC or --pre-format-files for VMs)
- flake.nix: add clanCore module + required settings to every mkTarget;
  deduplicate bundled disko/sops-nix via follows; all 27 hosts eval clean
- flake.lock: updated to reflect the new follows constraints
- scripts/lib/clan-vars.sh: new helper library with
  clan_ssh_key_exists / clan_ssh_pubkey_path / clan_decrypt_ssh_key /
  clan_generate_ssh_key for use by the provisioning and sync scripts
- scripts/secrets/sync-host-keys.sh: queue_host_sync() now checks clan
  vars first; generates via clan_generate_ssh_key if no key exists;
  derives age fingerprint from clan pub key for .sops.yaml registration
- scripts/proxmox/create-proxmox-resource.sh: key management simplified
  (sync-host-keys.sh now generates the key if missing, so the inline
  prepare-host-key.sh call is gone); sync_remote_host_keys() decrypts
  the clan key into a temp dir and scps just the two files to the node
  when a clan key exists, falling back to the old host-keys/ scp for
  any remaining legacy entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B2EJ4qTsM5KUqhS5c3GAwx
2026-07-25 18:22:33 +10:00

240 lines
12 KiB
Nix

{
description = "LAN NixOS configs";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
nixos-conf-editor.url = "github:snowfallorg/nixos-conf-editor";
home-manager = {
url = "github:nix-community/home-manager/release-26.05";
inputs.nixpkgs.follows = "nixpkgs";
};
disko = {
url = "github:nix-community/disko";
inputs.nixpkgs.follows = "nixpkgs";
};
sops-nix = {
url = "github:Mic92/sops-nix";
inputs.nixpkgs.follows = "nixpkgs";
};
clan-core = {
url = "https://git.clan.lol/clan/clan-core/archive/26.05.tar.gz";
# Deduplicate modules: clan-core bundles its own disko and sops-nix
# (both imported by nixosModules.clanCore). Without follows, we'd get
# two different versions of each, and disko's _module.args.diskoLib
# unique option would conflict. With follows, clan-core uses the same
# store paths as us, so NixOS deduplicates the imports.
inputs = {
nixpkgs.follows = "nixpkgs";
disko.follows = "disko";
sops-nix.follows = "sops-nix";
};
};
};
outputs = { self, nixpkgs, nixos-conf-editor, home-manager, sops-nix, ... } @ inputs:
let
system = "x86_64-linux";
inherit (nixpkgs) lib;
pkgs = nixpkgs.legacyPackages.${system};
vars = import ./variables.nix;
# Generates a nixosConfiguration from a platform (what it runs on) and
# a build type (what it's for), plus the per-identity host.nix that
# carries the bits that must stay fixed regardless of platform
# (hostName, hostId, per-machine secrets). Every build type except
# nix-cache itself consumes the nix-cache substituter and remote
# builder.
mkTarget = { platform, buildType, hostPath, homeFile ? ./modules/common/home.nix }:
let
flakeTarget = "${platform}-${buildType}";
in
nixpkgs.lib.nixosSystem {
inherit system;
modules = [
inputs.disko.nixosModules.disko
sops-nix.nixosModules.sops
inputs.clan-core.nixosModules.clanCore
{
# Required clan settings. directory is the flake root (where
# vars/ and sops/ directories live); machine.name is the flake
# target name (matches what clan vars generate uses as the key
# under vars/per-machine/). enableRecommendedDefaults = false
# is mandatory: without it, clan unconditionally enables
# networking.useNetworkd, adds packages, and tweaks nix settings
# -- none of which belong here.
clan.core = {
settings.directory = self;
settings.machine.name = flakeTarget;
enableRecommendedDefaults = false;
};
}
./modules/clan/ssh-host-key.nix
./modules/common/configuration.nix
./modules/platforms/${platform}.nix
./modules/build-types/${buildType}.nix
hostPath
{ environment.etc."flake-target".text = flakeTarget; }
home-manager.nixosModules.home-manager
{
home-manager = {
useGlobalPkgs = true;
useUserPackages = true;
extraSpecialArgs = { inherit vars; };
users.nixos = import homeFile;
};
}
] ++ lib.optionals (buildType != "nix-cache") [
./modules/nix-cache/client.nix
./modules/nix-cache/remote-builder-client.nix
];
# flakeTarget is passed via specialArgs (not read back from
# config.environment.etc."flake-target" above) specifically so
# modules/platforms/lxc.nix can use it to select its own host key
# file without a same-option circular dependency (a module
# contributing to environment.etc can't read the merged
# environment.etc it's itself contributing to).
specialArgs = { inherit inputs vars netbootSystem netbootMinimalSystem flakeTarget; };
};
# Generated platform x build-type matrix. pxe-boot has no linode
# variant (PXE/DHCP/TFTP need LAN L2 adjacency, which a Linode VPS
# doesn't have).
generatedTargets = {
linode-minimal = mkTarget { platform = "linode"; buildType = "minimal"; hostPath = ./hosts/nix-minimal/host.nix; };
proxmox-minimal = mkTarget { platform = "proxmox"; buildType = "minimal"; hostPath = ./hosts/nix-minimal/host.nix; };
lxc-minimal = mkTarget { platform = "lxc"; buildType = "minimal"; hostPath = ./hosts/nix-minimal/host.nix; };
linode-nix-cache = mkTarget { platform = "linode"; buildType = "nix-cache"; hostPath = ./hosts/nix-cache/host.nix; };
proxmox-nix-cache = mkTarget { platform = "proxmox"; buildType = "nix-cache"; hostPath = ./hosts/nix-cache/host.nix; };
lxc-nix-cache = mkTarget { platform = "lxc"; buildType = "nix-cache"; hostPath = ./hosts/nix-cache/host.nix; };
linode-server = mkTarget { platform = "linode"; buildType = "server"; hostPath = ./hosts/server/host.nix; };
proxmox-server = mkTarget { platform = "proxmox"; buildType = "server"; hostPath = ./hosts/server/host.nix; };
lxc-server = mkTarget { platform = "lxc"; buildType = "server"; hostPath = ./hosts/server/host.nix; };
linode-docker = mkTarget { platform = "linode"; buildType = "docker"; hostPath = ./hosts/docker/host.nix; };
proxmox-docker = mkTarget { platform = "proxmox"; buildType = "docker"; hostPath = ./hosts/docker/host.nix; };
lxc-docker = mkTarget { platform = "lxc"; buildType = "docker"; hostPath = ./hosts/docker/host.nix; };
linode-gui = mkTarget { platform = "linode"; buildType = "gui"; hostPath = ./hosts/nixos/host.nix; homeFile = ./hosts/nixos/home.nix; };
proxmox-gui = mkTarget { platform = "proxmox"; buildType = "gui"; hostPath = ./hosts/nixos/host.nix; homeFile = ./hosts/nixos/home.nix; };
lxc-gui = mkTarget { platform = "lxc"; buildType = "gui"; hostPath = ./hosts/nixos/host.nix; homeFile = ./hosts/nixos/home.nix; };
baremetal-gui = mkTarget { platform = "baremetal"; buildType = "gui"; hostPath = ./hosts/nixos/host.nix; homeFile = ./hosts/nixos/home.nix; };
proxmox-pxe-boot = mkTarget { platform = "proxmox"; buildType = "pxe-boot"; hostPath = ./hosts/pxe-boot/host.nix; };
lxc-pxe-boot = mkTarget { platform = "lxc"; buildType = "pxe-boot"; hostPath = ./hosts/pxe-boot/host.nix; };
linode-tailscale-router = mkTarget { platform = "linode"; buildType = "tailscale-router"; hostPath = ./hosts/tailscale-router/host.nix; };
proxmox-tailscale-router = mkTarget { platform = "proxmox"; buildType = "tailscale-router"; hostPath = ./hosts/tailscale-router/host.nix; };
lxc-tailscale-router = mkTarget { platform = "lxc"; buildType = "tailscale-router"; hostPath = ./hosts/tailscale-router/host.nix; };
lxc-tor-relay = mkTarget { platform = "lxc"; buildType = "tor-relay"; hostPath = ./hosts/tor-relay/host.nix; };
};
# Auto-install environments (migrated from the former nix-auto-installer
# flake): a self-contained NixOS installer that boots, discovers this
# flake's own nixosConfigurations over the network, and runs
# nixos-install against whichever one the operator picks. These are
# deliberately not part of the platform x build-type matrix above —
# they're throwaway boot media, not persistent hosts, so they skip
# disko/sops-nix/home-manager and just need `vars`.
installerTargets = {
installer = nixpkgs.lib.nixosSystem {
inherit system;
modules = [ ./modules/installer/iso.nix ];
specialArgs = { inherit vars; };
};
};
# Same installer environment, built as netboot (kernel + initrd +
# iPXE script) instead of an ISO — this is what packages.pxe bundles.
#
# Deliberately imports common.nix directly, NOT ./modules/installer/iso.nix
# (which pulls in nixpkgs' installation-cd-minimal.nix) -- confirmed live
# that composing the ISO module together with netboot-minimal.nix hangs
# every boot waiting for a device that can never exist on a netboot
# client ("A start job is running for /dev/disk/by-label/nixos-minimal-...").
# Both installation-cd-base.nix and netboot.nix set fileSystems."/" via
# the identical lib.mkImageMediaOverride (mkOverride 60) priority --
# genuinely conflicting root-filesystem strategies (ISO-by-label vs.
# netboot-tmpfs) at the same priority, and the ISO one was winning.
# netboot-minimal.nix's own chain (netboot-base.nix) already imports
# profiles/installation-device.nix independently, so common.nix's
# initialHashedPassword override (which assumes that profile is
# present) still applies correctly without iso.nix in the mix.
#
# networking.hostName is set explicitly (rather than left at nixpkgs'
# own "nixos" default) so this image's generated system name
# (nixos-system-auto-installer-*) matches its iPXE menu entry —
# see modules/build-types/pxe-boot.nix's :auto-installer item — and
# its staged directory, /srv/pxe/http/auto-installer.
netbootSystem = nixpkgs.lib.nixosSystem {
inherit system;
modules = [
./modules/installer/common.nix
({ modulesPath, ... }: {
imports = [
(modulesPath + "/installer/netboot/netboot-minimal.nix")
];
})
{ networking.hostName = "auto-installer"; }
];
specialArgs = { inherit vars; };
};
# A genuinely vanilla NixOS minimal netboot image: nixpkgs'
# netboot-minimal.nix on its own, with none of this flake's
# auto-installer wiring (no common.nix — no auto-install.sh, no
# baked host keys, no custom users/passwords). Built from source via
# the same nixosSystem + netboot-minimal.nix path as netbootSystem
# above, so both go through an identical build mechanism; the only
# difference is what's composed in. hostName again matches this
# image's iPXE menu entry (:nixos-minimal) and staged directory
# (/srv/pxe/http/nixos-minimal).
netbootMinimalSystem = nixpkgs.lib.nixosSystem {
inherit system;
modules = [
({ modulesPath, ... }: {
imports = [
(modulesPath + "/installer/netboot/netboot-minimal.nix")
];
})
{ networking.hostName = "nixos-minimal"; }
];
};
in
{
nixosConfigurations = generatedTargets // installerTargets;
# Buildable auto-installer artifacts (`nix build .#<name>`). No `lxc`
# variant (installer-boots-as-an-LXC-container) or `all` bundle
# anymore — lxc-* and proxmox-* hosts deploy via their own tarball/
# disk-image outputs instead (see docs/auto-installer.md and
# docs/proxmox-images.md), which left the installer's own LXC form
# with no real use case: it's excluded from the install menu (same
# bind-mount problem as any LXC nixos-install target) and nothing
# else needed booting the installer itself as a container.
packages.${system} = {
iso = installerTargets.installer.config.system.build.isoImage;
pxe = pkgs.linkFarm "pxe" [
{ name = "netboot.ipxe"; path = netbootSystem.config.system.build.netbootIpxeScript; }
{ name = "initrd"; path = netbootSystem.config.system.build.netbootRamdisk; }
{ name = "kernel"; path = netbootSystem.config.system.build.kernel; }
];
# Vanilla NixOS minimal netboot bundle — see netbootMinimalSystem
# above. Staged onto the pxe-boot host alongside packages.pxe by
# modules/pxe-boot/stage-installer-artifacts.nix.
pxe-minimal = pkgs.linkFarm "pxe-minimal" [
{ name = "netboot.ipxe"; path = netbootMinimalSystem.config.system.build.netbootIpxeScript; }
{ name = "initrd"; path = netbootMinimalSystem.config.system.build.netbootRamdisk; }
{ name = "kernel"; path = netbootMinimalSystem.config.system.build.kernel; }
];
};
};
}