f3d94cfc23
This reverts commit cad8957eab. It
breaks NixOps, but more importantly, such major changes to the module
system really need to be reviewed.
141 lines
3.9 KiB
Nix
141 lines
3.9 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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versionModule =
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{ system.nixosVersionSuffix = config.system.nixosVersionSuffix;
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system.nixosRevision = config.system.nixosRevision;
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nixpkgs.system = config.nixpkgs.system;
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};
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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. `${config.services.foo.package}`. */
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manual = import ../../../doc/manual {
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inherit pkgs;
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version = config.system.nixosVersion;
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revision = config.system.nixosRevision;
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options =
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let
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scrubbedEval = evalModules {
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modules = [ versionModule ] ++ baseModules;
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args = (config._module.args) // { modules = [ ]; };
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specialArgs = { pkgs = scrubDerivations "pkgs" pkgs; };
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};
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scrubDerivations = namePrefix: pkgSet: mapAttrs
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(name: value:
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let wholeName = "${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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help = 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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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 help ]
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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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