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309 lines
10 KiB
Nix
309 lines
10 KiB
Nix
{ config, lib, pkgs, ...}:
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with lib;
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let
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cfg = config.services.znc;
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defaultUser = "znc";
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modules = pkgs.buildEnv {
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name = "znc-modules";
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paths = cfg.modulePackages;
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};
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listenerPorts = concatMap (l: optional (l ? Port) l.Port)
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(attrValues (cfg.config.Listener or {}));
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# Converts the config option to a string
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semanticString = let
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sortedAttrs = set: sort (l: r:
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if l == "extraConfig" then false # Always put extraConfig last
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else if isAttrs set.${l} == isAttrs set.${r} then l < r
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else isAttrs set.${r} # Attrsets should be last, makes for a nice config
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# This last case occurs when any side (but not both) is an attrset
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# The order of these is correct when the attrset is on the right
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# which we're just returning
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) (attrNames set);
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# Specifies an attrset that encodes the value according to its type
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encode = name: value: {
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null = [];
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bool = [ "${name} = ${boolToString value}" ];
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int = [ "${name} = ${toString value}" ];
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# extraConfig should be inserted verbatim
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string = [ (if name == "extraConfig" then value else "${name} = ${value}") ];
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# Values like `Foo = [ "bar" "baz" ];` should be transformed into
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# Foo=bar
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# Foo=baz
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list = concatMap (encode name) value;
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# Values like `Foo = { bar = { Baz = "baz"; Qux = "qux"; Florps = null; }; };` should be transmed into
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# <Foo bar>
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# Baz=baz
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# Qux=qux
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# </Foo>
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set = concatMap (subname: optionals (value.${subname} != null) ([
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"<${name} ${subname}>"
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] ++ map (line: "\t${line}") (toLines value.${subname}) ++ [
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"</${name}>"
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])) (filter (v: v != null) (attrNames value));
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}.${builtins.typeOf value};
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# One level "above" encode, acts upon a set and uses encode on each name,value pair
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toLines = set: concatMap (name: encode name set.${name}) (sortedAttrs set);
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in
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concatStringsSep "\n" (toLines cfg.config);
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semanticTypes = with types; rec {
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zncAtom = nullOr (oneOf [ int bool str ]);
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zncAttr = attrsOf (nullOr zncConf);
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zncAll = oneOf [ zncAtom (listOf zncAtom) zncAttr ];
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zncConf = attrsOf (zncAll // {
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# Since this is a recursive type and the description by default contains
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# the description of its subtypes, infinite recursion would occur without
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# explicitly breaking this cycle
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description = "znc values (null, atoms (str, int, bool), list of atoms, or attrsets of znc values)";
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});
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};
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in
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{
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imports = [ ./options.nix ];
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options = {
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services.znc = {
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enable = mkEnableOption "ZNC";
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user = mkOption {
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default = "znc";
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example = "john";
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type = types.str;
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description = ''
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The name of an existing user account to use to own the ZNC server
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process. If not specified, a default user will be created.
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'';
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};
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group = mkOption {
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default = defaultUser;
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example = "users";
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type = types.str;
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description = ''
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Group to own the ZNC process.
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'';
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};
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dataDir = mkOption {
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default = "/var/lib/znc/";
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example = "/home/john/.znc/";
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type = types.path;
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description = ''
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The state directory for ZNC. The config and the modules will be linked
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to from this directory as well.
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'';
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};
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openFirewall = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to open ports in the firewall for ZNC. Does work with
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ports for listeners specified in
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<option>services.znc.config.Listener</option>.
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'';
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};
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config = mkOption {
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type = semanticTypes.zncConf;
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default = {};
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example = literalExample ''
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{
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LoadModule = [ "webadmin" "adminlog" ];
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User.paul = {
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Admin = true;
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Nick = "paul";
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AltNick = "paul1";
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LoadModule = [ "chansaver" "controlpanel" ];
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Network.freenode = {
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Server = "chat.freenode.net +6697";
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LoadModule = [ "simple_away" ];
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Chan = {
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"#nixos" = { Detached = false; };
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"##linux" = { Disabled = true; };
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};
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};
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Pass.password = {
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Method = "sha256";
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Hash = "e2ce303c7ea75c571d80d8540a8699b46535be6a085be3414947d638e48d9e93";
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Salt = "l5Xryew4g*!oa(ECfX2o";
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};
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};
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}
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'';
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description = ''
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Configuration for ZNC, see
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<link xlink:href="https://wiki.znc.in/Configuration"/> for details. The
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Nix value declared here will be translated directly to the xml-like
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format ZNC expects. This is much more flexible than the legacy options
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under <option>services.znc.confOptions.*</option>, but also can't do
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any type checking.
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</para>
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<para>
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You can use <command>nix-instantiate --eval --strict '<nixpkgs/nixos>' -A config.services.znc.config</command>
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to view the current value. By default it contains a listener for port
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5000 with SSL enabled.
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</para>
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<para>
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Nix attributes called <literal>extraConfig</literal> will be inserted
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verbatim into the resulting config file.
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</para>
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<para>
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If <option>services.znc.useLegacyConfig</option> is turned on, the
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option values in <option>services.znc.confOptions.*</option> will be
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gracefully be applied to this option.
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</para>
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<para>
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If you intend to update the configuration through this option, be sure
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to enable <option>services.znc.mutable</option>, otherwise none of the
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changes here will be applied after the initial deploy.
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'';
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};
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configFile = mkOption {
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type = types.path;
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example = "~/.znc/configs/znc.conf";
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description = ''
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Configuration file for ZNC. It is recommended to use the
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<option>config</option> option instead.
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</para>
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<para>
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Setting this option will override any auto-generated config file
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through the <option>confOptions</option> or <option>config</option>
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options.
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'';
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};
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modulePackages = mkOption {
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type = types.listOf types.package;
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default = [ ];
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example = literalExample "[ pkgs.zncModules.fish pkgs.zncModules.push ]";
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description = ''
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A list of global znc module packages to add to znc.
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'';
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};
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mutable = mkOption {
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default = true; # TODO: Default to true when config is set, make sure to not delete the old config if present
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type = types.bool;
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description = ''
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Indicates whether to allow the contents of the
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<literal>dataDir</literal> directory to be changed by the user at
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run-time.
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</para>
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<para>
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If enabled, modifications to the ZNC configuration after its initial
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creation are not overwritten by a NixOS rebuild. If disabled, the
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ZNC configuration is rebuilt on every NixOS rebuild.
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</para>
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<para>
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If the user wants to manage the ZNC service using the web admin
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interface, this option should be enabled.
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'';
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};
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extraFlags = mkOption {
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default = [ ];
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example = [ "--debug" ];
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type = types.listOf types.str;
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description = ''
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Extra arguments to use for executing znc.
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'';
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};
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};
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};
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###### Implementation
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config = mkIf cfg.enable {
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services.znc = {
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configFile = mkDefault (pkgs.writeText "znc-generated.conf" semanticString);
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config = {
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Version = lib.getVersion pkgs.znc;
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Listener.l.Port = mkDefault 5000;
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Listener.l.SSL = mkDefault true;
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};
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};
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networking.firewall.allowedTCPPorts = mkIf cfg.openFirewall listenerPorts;
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systemd.services.znc = {
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description = "ZNC Server";
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wantedBy = [ "multi-user.target" ];
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after = [ "network-online.target" ];
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serviceConfig = {
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User = cfg.user;
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Group = cfg.group;
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Restart = "always";
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ExecStart = "${pkgs.znc}/bin/znc --foreground --datadir ${cfg.dataDir} ${escapeShellArgs cfg.extraFlags}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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ExecStop = "${pkgs.coreutils}/bin/kill -INT $MAINPID";
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};
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preStart = ''
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mkdir -p ${cfg.dataDir}/configs
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# If mutable, regenerate conf file every time.
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${optionalString (!cfg.mutable) ''
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echo "znc is set to be system-managed. Now deleting old znc.conf file to be regenerated."
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rm -f ${cfg.dataDir}/configs/znc.conf
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''}
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# Ensure essential files exist.
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if [[ ! -f ${cfg.dataDir}/configs/znc.conf ]]; then
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echo "No znc.conf file found in ${cfg.dataDir}. Creating one now."
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cp --no-clobber ${cfg.configFile} ${cfg.dataDir}/configs/znc.conf
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chmod u+rw ${cfg.dataDir}/configs/znc.conf
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chown ${cfg.user} ${cfg.dataDir}/configs/znc.conf
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fi
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if [[ ! -f ${cfg.dataDir}/znc.pem ]]; then
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echo "No znc.pem file found in ${cfg.dataDir}. Creating one now."
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${pkgs.znc}/bin/znc --makepem --datadir ${cfg.dataDir}
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fi
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# Symlink modules
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rm ${cfg.dataDir}/modules || true
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ln -fs ${modules}/lib/znc ${cfg.dataDir}/modules
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'';
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};
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users.users = optionalAttrs (cfg.user == defaultUser) {
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${defaultUser} =
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{ description = "ZNC server daemon owner";
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group = defaultUser;
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uid = config.ids.uids.znc;
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home = cfg.dataDir;
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createHome = true;
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};
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};
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users.groups = optionalAttrs (cfg.user == defaultUser) {
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${defaultUser} =
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{ gid = config.ids.gids.znc;
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members = [ defaultUser ];
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};
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};
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};
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}
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