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nixpkgs/modules/services/misc/nixos-manual.nix

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# This module includes the NixOS man-pages in the system environment,
# and optionally starts a browser that shows the NixOS manual on one
# of the virtual consoles. The latter is useful for the installation
# CD.
{ config, pkgs, options, ... }:
with pkgs.lib;
let
cfg = config.services.nixosManual;
manual = import ../../../doc/manual {
inherit (cfg) revision;
inherit pkgs options;
};
in
{
options = {
services.nixosManual.enable = mkOption {
default = true;
description = ''
Whether to build the NixOS manual pages.
'';
};
services.nixosManual.showManual = mkOption {
default = false;
description = ''
Whether to show the NixOS manual on one of the virtual
consoles.
'';
};
services.nixosManual.ttyNumber = mkOption {
default = "8";
description = ''
Virtual console on which to show the manual.
'';
};
services.nixosManual.browser = mkOption {
default = "${pkgs.w3m}/bin/w3m";
description = ''
Browser used to show the manual.
'';
};
services.nixosManual.revision = mkOption {
default = "local";
type = types.uniq types.string;
description = ''
Revision of the targeted source file. This value can either be
<literal>"local"</literal>, <literal>"HEAD"</literal> or any
revision number embedded in a string.
'';
};
};
config = mkIf cfg.enable {
system.build.manual = manual;
environment.systemPackages = [manual];
boot.extraTTYs = mkIf cfg.showManual [cfg.ttyNumber];
jobAttrs = mkIf cfg.showManual
{ nixosManual =
{ name = "nixos-manual";
description = "NixOS manual";
startOn = "udev";
stopOn = "shutdown";
exec =
''
${cfg.browser} ${manual}/share/doc/nixos/manual.html \
< /dev/tty${toString cfg.ttyNumber} > /dev/tty${toString cfg.ttyNumber} 2>&1
'';
};
};
services.ttyBackgrounds.specificThemes = mkIf cfg.showManual
[ { tty = cfg.ttyNumber;
theme = pkgs.themes "green";
}
];
services.mingetty.helpLine = mkIf cfg.showManual
"\nPress <Alt-F${toString cfg.ttyNumber}> for the NixOS manual.";
};
}