82ad8c5ce0
Previously changing the value of certain options in configuration.nix would cause the manual to be regenerated, because some option defaults depend on the configuration. This is undesirable because rebuilding the manual is kind of slow. So now the manual reflects an empty configuration. The downside is that this requires another call to fixMergeModules, which adds about 14% to evaluation time. Probably worth it.
121 lines
2.9 KiB
Nix
121 lines
2.9 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, pkgs, baseModules, ... } @ extraArgs:
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with pkgs.lib;
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let
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cfg = config.services.nixosManual;
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manual = import ../../../doc/manual {
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inherit (cfg) revision;
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inherit pkgs;
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options = (fixMergeModules baseModules
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(removeAttrs extraArgs ["config" "options"]) // {
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modules = [ ];
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}).options;
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};
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entry = "${manual.manual}/share/doc/nixos/manual.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" ${entry}
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'';
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in
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{
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options = {
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services.nixosManual.enable = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether to build the NixOS manual pages.
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'';
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};
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services.nixosManual.showManual = mkOption {
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default = false;
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description = ''
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Whether to show the NixOS manual on one of the virtual
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consoles.
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'';
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};
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services.nixosManual.ttyNumber = mkOption {
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default = "8";
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description = ''
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Virtual console on which to show the manual.
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'';
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};
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services.nixosManual.browser = mkOption {
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default = "${pkgs.w3m}/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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services.nixosManual.revision = mkOption {
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default = "local";
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type = types.uniq types.string;
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description = ''
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Revision of the targeted source file. This value can either be
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<literal>"local"</literal>, <literal>"HEAD"</literal> or any
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revision number embedded in a string.
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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 = [ manual.manpages help ];
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boot.extraTTYs = mkIf cfg.showManual ["tty${cfg.ttyNumber}"];
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systemd.services = optionalAttrs cfg.showManual
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{ "nixos-manual" =
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{ description = "NixOS Manual";
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wantedBy = [ "multi-user.target" ];
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serviceConfig =
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{ ExecStart = "${cfg.browser} ${entry}";
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StandardInput = "tty";
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StandardOutput = "tty";
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TTYPath = "/dev/tty${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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