# Edit this configuration file to define what should be installed on # your system. Help is available in the configuration.nix(5) man page # and in the NixOS manual (accessible by running ‘nixos-help’). { config, pkgs, ... }: let netifWan = "enp0s31f6"; netifLan = "enp3s0"; netifWifi = "wlp1s0"; netifSit = "henet0"; hydraWwwOutputs = "/var/www/hydra-outputs"; in { imports = [ ./hardware-configuration.nix ./backup-module.nix ./flarum.nix (builtins.fetchTarball { url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/fb1cc04c0a517d4200237b02c3472bcaf9104afb/nixos-mailserver-nixos.tar.gz"; sha256 = "0vsvgxxg5cgmzwj98171j7h5l028f1yq784alb3lxgbk8znfk51y"; }) ]; # Use the systemd-boot EFI boot loader. boot.loader.systemd-boot.enable = true; boot.loader.efi.canTouchEfiVariables = true; boot.blacklistedKernelModules = ["iwlwifi"]; boot.supportedFilesystems = ["zfs"]; services.zfs.autoScrub.enable = true; services.zfs.autoSnapshot.enable = true; fileSystems."/tank" = { device = "tank"; fsType = "zfs"; }; security.apparmor.enable = true; networking = { hostName = "nixbld"; hostId = "b82fb017"; firewall = { allowedTCPPorts = [ 80 443 ]; allowedUDPPorts = [ 53 67 ]; trustedInterfaces = [ netifLan ]; }; interfaces."${netifLan}" = { ipv4.addresses = [{ address = "192.168.1.1"; prefixLength = 24; }]; ipv6.addresses = [{ address = "2001:470:f821:1::"; prefixLength = 64; }]; }; interfaces."${netifWifi}" = { ipv4.addresses = [{ address = "192.168.12.1"; prefixLength = 24; }]; ipv6.addresses = [{ address = "2001:470:f821:2::"; prefixLength = 64; }]; }; nat = { enable = true; externalInterface = netifWan; internalInterfaces = [ netifLan netifWifi ]; forwardPorts = [ { sourcePort = 2201; destination = "192.168.1.201:22"; proto = "tcp"; } { sourcePort = 2202; destination = "192.168.1.202:22"; proto = "tcp"; } { sourcePort = 2203; destination = "192.168.1.203:22"; proto = "tcp"; } { sourcePort = 2204; destination = "192.168.1.204:22"; proto = "tcp"; } { sourcePort = 2205; destination = "192.168.1.205:22"; proto = "tcp"; } ]; extraCommands = '' iptables -w -N block-lan-from-wifi iptables -w -A block-lan-from-wifi -i ${netifLan} -o ${netifWifi} -j DROP iptables -w -A block-lan-from-wifi -i ${netifWifi} -o ${netifLan} -j DROP iptables -w -A FORWARD -j block-lan-from-wifi ''; extraStopCommands = '' iptables -w -D FORWARD -j block-lan-from-wifi 2>/dev/null|| true iptables -w -F block-lan-from-wifi 2>/dev/null|| true iptables -w -X block-lan-from-wifi 2>/dev/null|| true ''; }; sits."${netifSit}" = { dev = netifWan; remote = "216.218.221.6"; local = "42.200.147.171"; ttl = 255; }; interfaces."${netifSit}".ipv6 = { addresses = [{ address = "2001:470:18:629::2"; prefixLength = 64; }]; routes = [{ address = "::"; prefixLength = 0; }]; }; }; boot.kernel.sysctl."net.ipv6.conf.all.forwarding" = "1"; boot.kernel.sysctl."net.ipv6.conf.default.forwarding" = "1"; services.unbound = { enable = true; extraConfig = '' server: port: 5353 ''; }; services.hostapd = { enable = true; interface = netifWifi; hwMode = "g"; ssid = "M-Labs"; wpaPassphrase = (import /etc/nixos/secret/wifi_password.nix); extraConfig = '' ieee80211d=1 country_code=HK ieee80211n=1 wmm_enabled=1 auth_algs=1 wpa_key_mgmt=WPA-PSK rsn_pairwise=CCMP ''; }; services.dnsmasq = { enable = true; servers = ["::1#5353"]; extraConfig = '' interface=${netifLan} interface=${netifWifi} bind-interfaces dhcp-range=interface:${netifLan},192.168.1.81,192.168.1.254,24h dhcp-range=interface:${netifWifi},192.168.12.10,192.168.12.254,24h enable-ra dhcp-range=interface:${netifLan},::,constructor:${netifLan},ra-names dhcp-range=interface:${netifWifi},::,constructor:${netifWifi},ra-only no-resolv # Static IPv4s to make Red Pitayas with factory firmware less annoying dhcp-host=rp-f05cc9,192.168.1.190 dhcp-host=rp-f0612e,192.168.1.191 # Static IPv4s to make port redirections work dhcp-host=rpi-1,192.168.1.201 dhcp-host=rpi-2,192.168.1.202 dhcp-host=rpi-3,192.168.1.203 dhcp-host=rpi-4,192.168.1.204 dhcp-host=rpi-5,192.168.1.205 # Static IP addresses for non-DHCP boards address=/thermostat/192.168.1.26 address=/powercycler/192.168.1.31 address=/kc705/192.168.1.50 address=/zynq-experiments/192.168.1.51 address=/zc706/192.168.1.52 address=/zc706-2/192.168.1.53 address=/cora-z7/192.168.1.54 address=/rust-pitaya/192.168.1.55 address=/sayma/192.168.1.60 address=/metlino/192.168.1.65 address=/kasli/192.168.1.70 address=/kasli-customer/192.168.1.75 address=/stabilizer-customer/192.168.1.76 # uTCA MCH from NAT address=/tschernobyl/192.168.1.80 ''; }; # Select internationalisation properties. i18n.defaultLocale = "en_US.UTF-8"; console = { font = "Lat2-Terminus16"; keyMap = "de"; }; # Set your time zone. time.timeZone = "Asia/Hong_Kong"; # List packages installed in system profile. To search, run: # $ nix search wget environment.systemPackages = with pkgs; [ wget vim git file lm_sensors acpi pciutils psmisc telnet nixops irssi tmux usbutils imagemagick jq zip unzip ]; # Some programs need SUID wrappers, can be configured further or are # started in user sessions. # programs.mtr.enable = true; # programs.gnupg.agent = { enable = true; enableSSHSupport = true; }; # List services that you want to enable: services.apcupsd.enable = true; services.apcupsd.configText = '' UPSTYPE usb NISIP 127.0.0.1 BATTERYLEVEL 10 MINUTES 5 ''; # Enable the OpenSSH daemon. services.openssh.enable = true; services.openssh.forwardX11 = true; services.openssh.passwordAuthentication = false; programs.mosh.enable = true; programs.fish.enable = true; # Enable CUPS to print documents. services.avahi.enable = true; services.avahi.interfaces = [ netifLan ]; services.avahi.publish.enable = true; services.avahi.publish.userServices = true; nixpkgs.config.allowUnfree = true; services.printing.enable = true; services.printing.drivers = [ pkgs.hplipWithPlugin ]; services.printing.browsing = true; services.printing.listenAddresses = [ "*:631" ]; services.printing.defaultShared = true; hardware.sane.enable = true; hardware.sane.extraBackends = [ pkgs.hplipWithPlugin ]; users.extraGroups.hkadmin = { }; users.extraUsers.sb = { isNormalUser = true; extraGroups = ["wheel" "hkadmin" "lp" "scanner"]; openssh.authorizedKeys.keys = [ "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCyPk5WyFoWSvF4ozehxcVBoZ+UHgrI7VW/OoQfFFwIQe0qvetUZBMZwR2FwkLPAMZV8zz1v4EfncudEkVghy4P+/YVLlDjqDq9zwZnh8Nd/ifu84wmcNWHT2UcqnhjniCdshL8a44memzABnxfLLv+sXhP2x32cJAamo5y6fukr2qLp2jbXzR+3sv3klE0ruUXis/BR1lLqNJEYP8jB6fLn2sLKinnZPfn6DwVOk10mGeQsdME/eGl3phpjhODH9JW5V2V5nJBbC0rBnq+78dyArKVqjPSmIcSy72DEIpTctnMEN1W34BGrnsDd5Xd/DKxKxHKTMCHtZRwLC2X0NWN" "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCMALVC8RDTHec+PC8y1s3tcpUAODgq6DEzQdHDf/cyvDMfmCaPiMxfIdmkns5lMa03hymIfSmLUF0jFFDc7biRp7uf9AAXNsrTmplHii0l0McuOOZGlSdZM4eL817P7UwJqFMxJyFXDjkubhQiX6kp25Kfuj/zLnupRCaiDvE7ho/xay6Jrv0XLz935TPDwkc7W1asLIvsZLheB+sRz9SMOb9gtrvk5WXZl5JTOFOLu+JaRwQLHL/xdcHJTOod7tqHYfpoC5JHrEwKzbhTOwxZBQBfTQjQktKENQtBxXHTe71rUEWfEZQGg60/BC4BrRmh4qJjlJu3v4VIhC7SSHn1" ]; shell = pkgs.fish; }; users.extraUsers.rj = { isNormalUser = true; extraGroups = ["wheel"]; }; users.extraUsers.harry = { isNormalUser = true; extraGroups = ["hkadmin" "lp" "scanner"]; openssh.authorizedKeys.keys = [ "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBDcPNCgtdz8erFPRrAwCr4JrkeYXJUUvoRBgP0X2HlzJgDe1Inuo6sC6CGcO3IXbf4MwVA9XEp8BYPHARVeEHhufg/0wnIABLx2GcK99yxOLDUe4h/3YwtqvOcqHEsDx7w==" ]; }; users.extraUsers.nix = { isNormalUser = true; }; security.sudo.wheelNeedsPassword = false; security.hideProcessInformation = true; boot.kernel.sysctl."kernel.dmesg_restrict" = true; services.udev.packages = [ pkgs.sane-backends ]; nix.distributedBuilds = true; nix.buildMachines = [ { hostName = "localhost"; maxJobs = 4; system = "x86_64-linux"; supportedFeatures = ["big-parallel"]; } { hostName = "rpi-3"; sshUser = "nix"; sshKey = "/etc/nixos/secret/nix_id_rsa"; maxJobs = 1; system = "aarch64-linux"; } ]; services.hydra = { enable = true; package = pkgs.hydra-unstable; useSubstitutes = true; hydraURL = "https://nixbld.m-labs.hk"; notificationSender = "hydra@m-labs.hk"; minimumDiskFree = 15; # in GB minimumDiskFreeEvaluator = 1; extraConfig = '' binary_cache_secret_key_file = /etc/nixos/secret/nixbld.m-labs.hk-1 max_output_size = 10000000000 job = web:web:web command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/web job = artiq:full:sipyco-manual-html command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/sipyco-manual-html job = artiq:full:sipyco-manual-latexpdf command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/sipyco-manual-latexpdf job = artiq:full-beta:artiq-manual-html command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-manual-html-beta job = artiq:full-beta:artiq-manual-latexpdf command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-manual-latexpdf-beta job = artiq:full-beta:conda-channel command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-conda-channel-beta job = artiq:full:artiq-manual-html command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-manual-html job = artiq:full:artiq-manual-latexpdf command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-manual-latexpdf job = artiq:full:conda-channel command = [ $(jq '.buildStatus' < $HYDRA_JSON) = 0 ] && ln -sfn $(jq -r '.outputs[0].path' < $HYDRA_JSON) ${hydraWwwOutputs}/artiq-conda-channel jobs = artiq:fast.*:extended-tests inputs = artiqSrc useShortContext = 1 authorization = token ${(import /etc/nixos/secret/github_tokens.nix).artiq} jobs = artiq:zynq:zc706-hitl-tests inputs = artiq-zynq token ${(import /etc/nixos/secret/gitea_tokens.nix).artiq-zynq} ''; }; systemd.services.hydra-www-outputs-init = { description = "Set up a hydra-owned directory for build outputs"; wantedBy = [ "multi-user.target" ]; requiredBy = [ "hydra-queue-runner.service" ]; before = [ "hydra-queue-runner.service" ]; serviceConfig = { Type = "oneshot"; ExecStart = [ "${pkgs.coreutils}/bin/mkdir -p ${hydraWwwOutputs}" "${pkgs.coreutils}/bin/chown hydra-queue-runner:hydra ${hydraWwwOutputs}" ]; }; }; nix.extraOptions = '' secret-key-files = /etc/nixos/secret/nixbld.m-labs.hk-1 ''; nix.sandboxPaths = ["/opt"]; services.munin-node.enable = true; services.munin-cron = { enable = true; hosts = '' [${config.networking.hostName}] address localhost ''; }; services.mlabs-backup.enable = true; services.gitea = { enable = true; httpPort = 3001; rootUrl = "https://git.m-labs.hk/"; appName = "M-Labs Git"; cookieSecure = true; disableRegistration = true; mailerPasswordFile = "/etc/nixos/secret/mailerpassword"; settings = { indexer = { REPO_INDEXER_ENABLED = true; }; mailer = { ENABLED = true; HOST = "ssl.serverraum.org:587"; FROM = "sysop@m-labs.hk"; USER = "sysop@m-labs.hk"; }; service = { ENABLE_NOTIFY_MAIL = true; }; attachment = { ALLOWED_TYPES = "*/*"; }; }; }; systemd.tmpfiles.rules = [ "L+ '${config.services.gitea.stateDir}/custom/templates/home.tmpl' - - - - ${./gitea-home.tmpl}" "L+ '${config.services.gitea.stateDir}/custom/templates/user/auth/signin.tmpl' - - - - ${./gitea-signin.tmpl}" ]; services.mattermost = { enable = true; siteUrl = "https://chat.m-labs.hk/"; mutableConfig = true; }; services.matterbridge = { enable = true; configPath = "/etc/nixos/secret/matterbridge.toml"; }; nixpkgs.config.packageOverrides = super: let self = super.pkgs; in { nix = super.nix.overrideAttrs(oa: { patches = oa.patches or [] ++ [ ./nix-networked-derivations.diff ]; }); nixFlakes = super.nixFlakes.overrideAttrs(oa: { patches = oa.patches or [] ++ [ ./nix-3-networked-derivations.patch ]; }); hydra-unstable = super.hydra-unstable.overrideAttrs(oa: { patches = oa.patches or [] ++ [ ./hydra-conda.patch ./hydra-unbreak-sysbuild.patch ./hydra-restrictdist.patch ./hydra-giteastatus.patch ]; hydraPath = oa.hydraPath + ":" + super.lib.makeBinPath [ super.jq ]; }); matterbridge = super.matterbridge.overrideAttrs(oa: { patches = oa.patches or [] ++ [ ./matterbridge-disable-github.patch ]; }); gitea = super.gitea.overrideAttrs(oa: { preBuild = let tagsString = "pam sqlite sqlite_unlock_notify"; in '' export buildFlagsArray=( -tags="${tagsString}" -ldflags='-X "main.Version=${oa.version}" -X "main.Tags=${tagsString}"' ) ''; }); }; security.acme.acceptTerms = true; security.acme.email = "sb" + "@m-labs.hk"; security.acme.certs = { "nixbld.m-labs.hk" = { group = "nginx"; webroot = "/var/lib/acme/acme-challenge"; extraDomainNames = [ "m-labs.hk" "www.m-labs.hk" "conda.m-labs.hk" "lab.m-labs.hk" "git.m-labs.hk" "chat.m-labs.hk" "hooks.m-labs.hk" "forum.m-labs.hk" "perso.m-labs.hk" "call.m-labs.hk" "nmigen.org" "www.nmigen.org" ]; }; }; # https://github.com/NixOS/nixpkgs/issues/106862 systemd.services."acme-fixperms".wants = [ "unbound.service" "dnsmasq.service" ]; systemd.services."acme-fixperms".after = [ "unbound.service" "dnsmasq.service" ]; services.nginx = { enable = true; recommendedProxySettings = true; recommendedGzipSettings = true; virtualHosts = let mainWebsite = { addSSL = true; useACMEHost = "nixbld.m-labs.hk"; root = "${hydraWwwOutputs}/web"; extraConfig = '' error_page 404 /404.html; ''; locations."^~ /fonts/".extraConfig = '' expires 60d; ''; locations."^~ /js/".extraConfig = '' expires 60d; ''; locations."/MathJax/" = { alias = "/var/www/MathJax/"; extraConfig = '' expires 60d; ''; }; # legacy URLs, redirect to avoid breaking people's bookmarks locations."/gateware.html".extraConfig = '' return 301 /gateware/migen/; ''; locations."/migen".extraConfig = '' return 301 /gateware/migen/; ''; locations."/artiq".extraConfig = '' return 301 /experiment-control/artiq/; ''; locations."/artiq/resources.html".extraConfig = '' return 301 /experiment-control/resources/; ''; # autogenerated manuals locations."/artiq/sipyco-manual/" = { alias = "${hydraWwwOutputs}/sipyco-manual-html/share/doc/sipyco-manual/html/"; }; locations."=/artiq/sipyco-manual.pdf" = { alias = "${hydraWwwOutputs}/sipyco-manual-latexpdf/share/doc/sipyco-manual/SiPyCo.pdf"; }; locations."/artiq/manual-beta/" = { alias = "${hydraWwwOutputs}/artiq-manual-html-beta/share/doc/artiq-manual/html/"; }; locations."=/artiq/manual-beta.pdf" = { alias = "${hydraWwwOutputs}/artiq-manual-latexpdf-beta/share/doc/artiq-manual/ARTIQ.pdf"; }; locations."/artiq/manual/" = { alias = "${hydraWwwOutputs}/artiq-manual-html/share/doc/artiq-manual/html/"; }; locations."=/artiq/manual.pdf" = { alias = "${hydraWwwOutputs}/artiq-manual-latexpdf/share/doc/artiq-manual/ARTIQ.pdf"; }; # legacy content locations."/migen/manual/" = { alias = "/var/www/m-labs.hk.old/migen/manual/"; }; locations."/artiq/manual-release-4/" = { alias = "/var/www/m-labs.hk.old/artiq/manual-release-4/"; }; locations."/artiq/manual-release-3/" = { alias = "/var/www/m-labs.hk.old/artiq/manual-release-3/"; }; locations."/artiq/manual-release-2/" = { alias = "/var/www/m-labs.hk.old/artiq/manual-release-2/"; }; }; in { "m-labs.hk" = mainWebsite; "www.m-labs.hk" = mainWebsite; "lab.m-labs.hk" = { addSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/munin/".alias = "/var/www/munin/"; locations."/munin".extraConfig = '' auth_basic "Munin"; auth_basic_user_file /etc/nixos/secret/muninpasswd; ''; }; "nixbld.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/".proxyPass = "http://127.0.0.1:3000"; }; "conda.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/artiq-beta/" = { alias = "${hydraWwwOutputs}/artiq-conda-channel-beta/"; extraConfig = '' autoindex on; index bogus_index_file; ''; }; locations."/artiq/" = { alias = "${hydraWwwOutputs}/artiq-conda-channel/"; extraConfig = '' autoindex on; index bogus_index_file; ''; }; }; "git.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/".proxyPass = "http://127.0.0.1:3001"; extraConfig = '' client_max_body_size 300M; ''; }; "chat.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/".proxyPass = "http://127.0.0.1:8065"; locations."~ /api/v[0-9]+/(users/)?websocket$".proxyPass = "http://127.0.0.1:8065"; locations."~ /api/v[0-9]+/(users/)?websocket$".proxyWebsockets = true; }; "hooks.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/mattermost-github".extraConfig = '' include ${pkgs.nginx}/conf/uwsgi_params; uwsgi_pass unix:${config.services.uwsgi.runDir}/uwsgi-mgi.sock; ''; locations."/rfq".extraConfig = '' include ${pkgs.nginx}/conf/uwsgi_params; uwsgi_pass unix:${config.services.uwsgi.runDir}/uwsgi-rfq.sock; ''; }; "forum.m-labs.hk" = { forceSSL = true; useACMEHost = "nixbld.m-labs.hk"; root = "${config.services.flarum.installPath}/public"; locations."~ \.php$".extraConfig = '' fastcgi_pass unix:${config.services.phpfpm.pools.flarum.socket}; fastcgi_index index.php; ''; extraConfig = '' index index.php; include ${config.services.flarum.installPath}/.nginx.conf; ''; }; "call.m-labs.hk" = { useACMEHost = "nixbld.m-labs.hk"; enableACME = false; forceSSL = true; }; "perso.m-labs.hk" = { addSSL = true; useACMEHost = "nixbld.m-labs.hk"; root = "/var/www/perso"; }; "nmigen.org" = { addSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/".extraConfig = '' return 307 https://m-labs.hk/gateware/nmigen/; ''; }; "www.nmigen.org" = { addSSL = true; useACMEHost = "nixbld.m-labs.hk"; locations."/".extraConfig = '' return 307 https://m-labs.hk/gateware/nmigen/; ''; }; }; }; services.uwsgi = { enable = true; plugins = [ "python3" ]; instance = { type = "emperor"; vassals = { mattermostgithub = import ./mattermost-github-integration/uwsgi-config.nix { inherit config pkgs; }; rfq = import ./rfq/uwsgi-config.nix { inherit config pkgs; }; }; }; }; services.mysql = { enable = true; package = pkgs.mariadb; }; services.phpfpm.pools.flarum = { user = config.services.flarum.user; settings = { "listen.owner" = "nginx"; "listen.group" = "nginx"; "listen.mode" = "0600"; "pm" = "dynamic"; "pm.max_children" = 5; "pm.start_servers" = 2; "pm.min_spare_servers" = 1; "pm.max_spare_servers" = 3; "pm.max_requests" = 500; }; }; services.jitsi-meet = { enable = true; hostName = "call.m-labs.hk"; }; services.jitsi-videobridge.openFirewall = true; mailserver = { enable = true; localDnsResolver = false; # conflicts with dnsmasq # Some mail servers do reverse DNS lookups to filter spam. # Getting a proper reverse DNS record from ISP is difficult, so use whatever already exists. fqdn = "42-200-147-171.static.imsbiz.com"; domains = [ "nmigen.org" ]; loginAccounts = (import /etc/nixos/secret/email_accounts.nix); certificateScheme = 3; }; security.acme.certs."${config.mailserver.fqdn}".extraDomainNames = [ "mail.nmigen.org" ]; # This value determines the NixOS release with which your system is to be # compatible, in order to avoid breaking some software such as database # servers. You should change this only after NixOS release notes say you # should. system.stateVersion = "18.09"; # Did you read the comment? }