145 lines
4.1 KiB
Nix
145 lines
4.1 KiB
Nix
# This module includes the NixOS man-pages in the system environment,
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# and optionally starts a browser that shows the NixOS manual on one
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# of the virtual consoles. The latter is useful for the installation
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# CD.
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{ config, lib, pkgs, baseModules, ... }:
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with lib;
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let
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cfg = config.services.nixosManual;
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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. `${config.services.foo.package}`. */
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manual = import ../../../doc/manual {
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inherit pkgs config;
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version = config.system.nixosRelease;
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revision = "release-${config.system.nixosRelease}";
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options =
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let
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scrubbedEval = evalModules {
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modules = [ { nixpkgs.system = config.nixpkgs.system; } ] ++ baseModules;
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args = (config._module.args) // { modules = [ ]; };
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specialArgs = { pkgs = scrubDerivations "pkgs" pkgs; };
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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 = "\${${wholeName}}"; })
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else value
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)
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pkgSet;
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in scrubbedEval.options;
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};
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entry = "${manual.manual}/share/doc/nixos/index.html";
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helpScript = pkgs.writeScriptBin "nixos-help"
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''
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#! ${pkgs.stdenv.shell} -e
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browser="$BROWSER"
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if [ -z "$browser" ]; then
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browser="$(type -P xdg-open || true)"
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if [ -z "$browser" ]; then
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browser="$(type -P w3m || true)"
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if [ -z "$browser" ]; then
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echo "$0: unable to start a web browser; please set \$BROWSER"
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exit 1
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fi
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fi
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fi
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exec "$browser" ${entry}
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'';
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desktopItem = pkgs.makeDesktopItem {
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name = "nixos-manual";
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desktopName = "NixOS Manual";
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genericName = "View NixOS documentation in a web browser";
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# TODO: find a better icon (Nix logo + help overlay?)
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icon = "system-help";
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exec = "${helpScript}/bin/nixos-help";
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categories = "System";
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};
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in
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{
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options = {
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services.nixosManual.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 build the NixOS manual pages.
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'';
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};
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services.nixosManual.showManual = 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 show the NixOS manual on one of the virtual
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consoles.
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'';
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};
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services.nixosManual.ttyNumber = mkOption {
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type = types.int;
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default = 8;
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description = ''
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Virtual console on which to show the manual.
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'';
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};
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services.nixosManual.browser = mkOption {
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type = types.path;
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default = "${pkgs.w3m-nox}/bin/w3m";
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description = ''
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Browser used to show the manual.
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'';
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};
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};
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config = mkIf cfg.enable {
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system.build.manual = manual;
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environment.systemPackages =
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[ manual.manual helpScript ]
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++ optional config.services.xserver.enable desktopItem
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++ optional config.programs.man.enable manual.manpages;
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boot.extraTTYs = mkIf cfg.showManual ["tty${toString cfg.ttyNumber}"];
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systemd.services = optionalAttrs cfg.showManual
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{ "nixos-manual" =
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{ description = "NixOS Manual";
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wantedBy = [ "multi-user.target" ];
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serviceConfig =
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{ ExecStart = "${cfg.browser} ${entry}";
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StandardInput = "tty";
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StandardOutput = "tty";
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TTYPath = "/dev/tty${toString cfg.ttyNumber}";
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TTYReset = true;
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TTYVTDisallocate = true;
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Restart = "always";
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};
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};
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};
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services.mingetty.helpLine = mkIf cfg.showManual
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"\nPress <Alt-F${toString cfg.ttyNumber}> for the NixOS manual.";
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};
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}
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