270 lines
9.1 KiB
Nix
270 lines
9.1 KiB
Nix
{ config, lib, pkgs, baseModules, extraModules, modules, modulesPath, ... }:
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with lib;
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let
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cfg = config.documentation;
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manualModules = baseModules ++ optionals cfg.nixos.includeAllModules (extraModules ++ modules);
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/* For the purpose of generating docs, evaluate options with each derivation
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in `pkgs` (recursively) replaced by a fake with path "\${pkgs.attribute.path}".
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It isn't perfect, but it seems to cover a vast majority of use cases.
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Caveat: even if the package is reached by a different means,
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the path above will be shown and not e.g. `${config.services.foo.package}`. */
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manual = import ../../doc/manual rec {
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inherit pkgs config;
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version = config.system.nixos.release;
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revision = "release-${version}";
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extraSources = cfg.nixos.extraModuleSources;
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options =
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let
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scrubbedEval = evalModules {
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modules = [ { nixpkgs.localSystem = config.nixpkgs.localSystem; } ] ++ manualModules;
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args = (config._module.args) // { modules = [ ]; };
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specialArgs = {
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pkgs = scrubDerivations "pkgs" pkgs;
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inherit modulesPath;
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};
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};
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scrubDerivations = namePrefix: pkgSet: mapAttrs
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(name: value:
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let wholeName = "${namePrefix}.${name}"; in
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if isAttrs value then
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scrubDerivations wholeName value
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// (optionalAttrs (isDerivation value) { outPath = "\${${wholeName}}"; })
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else value
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)
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pkgSet;
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in scrubbedEval.options;
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};
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nixos-help = let
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helpScript = pkgs.writeShellScriptBin "nixos-help" ''
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# Finds first executable browser in a colon-separated list.
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# (see how xdg-open defines BROWSER)
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browser="$(
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IFS=: ; for b in $BROWSER; do
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[ -n "$(type -P "$b" || true)" ] && echo "$b" && break
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done
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)"
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if [ -z "$browser" ]; then
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browser="$(type -P xdg-open || true)"
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if [ -z "$browser" ]; then
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browser="${pkgs.w3m-nographics}/bin/w3m"
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fi
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fi
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exec "$browser" ${manual.manualHTMLIndex}
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'';
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desktopItem = pkgs.makeDesktopItem {
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name = "nixos-manual";
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desktopName = "NixOS Manual";
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genericName = "View NixOS documentation in a web browser";
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icon = "nix-snowflake";
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exec = "nixos-help";
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categories = "System";
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};
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in pkgs.symlinkJoin {
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name = "nixos-help";
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paths = [
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helpScript
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desktopItem
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];
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};
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in
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{
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imports = [
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(mkRenamedOptionModule [ "programs" "info" "enable" ] [ "documentation" "info" "enable" ])
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(mkRenamedOptionModule [ "programs" "man" "enable" ] [ "documentation" "man" "enable" ])
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(mkRenamedOptionModule [ "services" "nixosManual" "enable" ] [ "documentation" "nixos" "enable" ])
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];
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options = {
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documentation = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install documentation of packages from
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<option>environment.systemPackages</option> into the generated system path.
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See "Multiple-output packages" chapter in the nixpkgs manual for more info.
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'';
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# which is at ../../../doc/multiple-output.chapter.md
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};
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man.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install manual pages and the <command>man</command> command.
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This also includes "man" outputs.
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'';
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};
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man.generateCaches = 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 generate the manual page index caches using
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<literal>mandb(8)</literal>. This allows searching for a page or
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keyword using utilities like <literal>apropos(1)</literal>.
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'';
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};
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info.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install info pages and the <command>info</command> command.
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This also includes "info" outputs.
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'';
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};
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doc.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install documentation distributed in packages' <literal>/share/doc</literal>.
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Usually plain text and/or HTML.
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This also includes "doc" outputs.
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'';
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};
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dev.enable = 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 install documentation targeted at developers.
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<itemizedlist>
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<listitem><para>This includes man pages targeted at developers if <option>man.enable</option> is
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set (this also includes "devman" outputs).</para></listitem>
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<listitem><para>This includes info pages targeted at developers if <option>info.enable</option>
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is set (this also includes "devinfo" outputs).</para></listitem>
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<listitem><para>This includes other pages targeted at developers if <option>doc.enable</option>
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is set (this also includes "devdoc" outputs).</para></listitem>
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</itemizedlist>
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'';
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};
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nixos.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to install NixOS's own documentation.
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<itemizedlist>
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<listitem><para>This includes man pages like
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<citerefentry><refentrytitle>configuration.nix</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> if <option>man.enable</option> is
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set.</para></listitem>
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<listitem><para>This includes the HTML manual and the <command>nixos-help</command> command if
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<option>doc.enable</option> is set.</para></listitem>
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</itemizedlist>
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'';
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};
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nixos.includeAllModules = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the generated NixOS's documentation should include documentation for all
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the options from all the NixOS modules included in the current
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<literal>configuration.nix</literal>. Disabling this will make the manual
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generator to ignore options defined outside of <literal>baseModules</literal>.
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'';
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};
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nixos.extraModuleSources = mkOption {
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type = types.listOf (types.either types.path types.str);
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default = [ ];
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description = ''
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Which extra NixOS module paths the generated NixOS's documentation should strip
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from options.
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'';
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example = literalExample ''
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# e.g. with options from modules in ''${pkgs.customModules}/nix:
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[ pkgs.customModules ]
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'';
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};
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};
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};
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config = mkIf cfg.enable (mkMerge [
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(mkIf cfg.man.enable {
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environment.systemPackages = [ pkgs.man-db ];
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environment.pathsToLink = [ "/share/man" ];
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environment.extraOutputsToInstall = [ "man" ] ++ optional cfg.dev.enable "devman";
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environment.etc."man_db.conf".text =
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let
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manualPages = pkgs.buildEnv {
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name = "man-paths";
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paths = config.environment.systemPackages;
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pathsToLink = [ "/share/man" ];
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extraOutputsToInstall = ["man"];
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ignoreCollisions = true;
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};
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manualCache = pkgs.runCommandLocal "man-cache" { }
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''
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echo "MANDB_MAP ${manualPages}/share/man $out" > man.conf
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${pkgs.man-db}/bin/mandb -C man.conf -psc >/dev/null 2>&1
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'';
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in
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''
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# Manual pages paths for NixOS
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MANPATH_MAP /run/current-system/sw/bin /run/current-system/sw/share/man
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MANPATH_MAP /run/wrappers/bin /run/current-system/sw/share/man
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${optionalString cfg.man.generateCaches ''
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# Generated manual pages cache for NixOS (immutable)
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MANDB_MAP /run/current-system/sw/share/man ${manualCache}
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''}
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# Manual pages caches for NixOS
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MANDB_MAP /run/current-system/sw/share/man /var/cache/man/nixos
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'';
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})
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(mkIf cfg.info.enable {
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environment.systemPackages = [ pkgs.texinfoInteractive ];
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environment.pathsToLink = [ "/share/info" ];
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environment.extraOutputsToInstall = [ "info" ] ++ optional cfg.dev.enable "devinfo";
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environment.extraSetup = ''
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if [ -w $out/share/info ]; then
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shopt -s nullglob
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for i in $out/share/info/*.info $out/share/info/*.info.gz; do
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${pkgs.buildPackages.texinfo}/bin/install-info $i $out/share/info/dir
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done
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fi
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'';
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})
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(mkIf cfg.doc.enable {
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environment.pathsToLink = [ "/share/doc" ];
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environment.extraOutputsToInstall = [ "doc" ] ++ optional cfg.dev.enable "devdoc";
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})
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(mkIf cfg.nixos.enable {
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system.build.manual = manual;
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environment.systemPackages = []
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++ optional cfg.man.enable manual.manpages
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++ optionals cfg.doc.enable [ manual.manualHTML nixos-help ];
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services.getty.helpLine = mkIf cfg.doc.enable (
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"\nRun 'nixos-help' for the NixOS manual."
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);
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})
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]);
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}
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