nixpkgs/upstart-jobs/manual.nix

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{pkgs, config, ...}:
# Show the NixOS manual on tty7
# Originally used only by installation CD
let
inherit (pkgs.lib) mkOption;
options = {
services = {
showManual = {
enable = mkOption {
default = false;
description = "
Whether to show the NixOS manual on the tty7
";
};
ttyNumber = mkOption {
default = "7";
description = "
TTY number name to show the manual on
";
};
browserPackage = mkOption {
default = pkgs.w3m;
description = "
Package containing the browser to be used
";
};
browserCommand = mkOption {
default = "bin/w3m";
description = "
Command (command path is relative to browserPackage) to run the browser
";
};
manualFile = mkOption {
default = null;
description = "
NixOS manual HTML file
";
};
}; # showManual
}; # services
};
in
let
cfg = config.services.showManual;
in let # !!! Bug in Nix 0.13pre14722, otherwise the following line is not aware of cfg.
inherit (cfg) enable ttyNumber browserPackage browserCommand manualFile;
realManualFile =
if manualFile == null then
(import ../doc/manual {nixpkgs = pkgs;})+"/manual.html"
else
manualFile;
inherit (pkgs.lib) mkIf mkThenElse;
in
mkIf enable {
require = [
options
];
boot = {
extraTTYs = [ ttyNumber ];
};
services = {
extraJobs = [{
name = "showManual";
job = ''
description "NixOS manual"
start on udev
stop on shutdown
respawn ${browserPackage}/${browserCommand} ${realManualFile} < /dev/tty${toString ttyNumber} > /dev/tty${toString ttyNumber} 2>&1
'';
}];
ttyBackgrounds = {
specificThemes = [{
tty = ttyNumber;
theme = pkgs.themes "green";
}];
};
mingetty = {
helpLine = mkThenElse {
thenPart = "\nPress <Alt-F${toString ttyNumber}> for NixOS manual.";
elsePart = "";
};
};
};
}