155 lines
4.7 KiB
Nix
155 lines
4.7 KiB
Nix
# This module contains the basic configuration for building a NixOS
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# installation CD.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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options = {
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system.nixosVersion = mkOption {
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default = "${builtins.readFile ../../../VERSION}";
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description = ''
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NixOS version number.
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'';
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};
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installer.configModule = mkOption {
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example = "./nixos/modules/installer/cd-dvd/installation-cd.nix";
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description = ''
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Filename of the configuration module that builds the CD
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configuration. Must be specified to support reconfiguration
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in live CDs.
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'';
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};
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};
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# We need a copy of the Nix expressions for Nixpkgs and NixOS on the
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# CD. We put them in a tarball because accessing that many small
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# files from a slow device like a CD-ROM takes too long. !!! Once
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# we use squashfs, maybe we won't need this anymore.
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makeTarball = tarName: input: pkgs.runCommand "tarball" {inherit tarName;}
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''
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ensureDir $out
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(cd ${input} && tar cvfj $out/${tarName} . \
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--exclude '*~' --exclude 'result')
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'';
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# Put the current directory in a tarball.
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nixosTarball = makeTarball "nixos.tar.bz2" (cleanSource ../../..);
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# Put Nixpkgs in a tarball.
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nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" (cleanSource pkgs.path);
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includeSources = true;
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# A dummy /etc/nixos/configuration.nix in the booted CD that
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# rebuilds the CD's configuration (and allows the configuration to
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# be modified, of course, providing a true live CD). Problem is
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# that we don't really know how the CD was built - the Nix
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# expression language doesn't allow us to query the expression being
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# evaluated. So we'll just hope for the best.
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dummyConfiguration = pkgs.writeText "configuration.nix"
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''
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{config, pkgs, ...}:
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{
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require = [${config.installer.configModule}];
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# Add your own options below and run "nixos-rebuild switch".
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# E.g.,
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# services.openssh.enable = true;
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}
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'';
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in
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{
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require =
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[ options
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./memtest.nix
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./iso-image.nix
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../../profiles/base.nix
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];
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# ISO naming.
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isoImage.isoName = "nixos-${config.system.nixosVersion}-${pkgs.stdenv.system}.iso";
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isoImage.volumeID = "NIXOS_INSTALL_CD_${config.system.nixosVersion}";
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# Show the manual.
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services.nixosManual.showManual = true;
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# Let the user play Rogue on TTY 8 during the installation.
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services.rogue.enable = true;
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# Disable some other stuff we don't need.
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security.sudo.enable = false;
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# Include only the en_US locale. This saves 75 MiB or so compared to
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# the full glibcLocales package.
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i18n.supportedLocales = ["en_US.UTF-8/UTF-8" "en_US/ISO-8859-1"];
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# nixos-install will do a pull from this channel to speed up the
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# installation.
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installer.nixpkgsURL = http://nixos.org/releases/nixpkgs/channels/nixpkgs-unstable;
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boot.postBootCommands =
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''
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export PATH=${pkgs.gnutar}/bin:${pkgs.bzip2}/bin:$PATH
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# Provide a mount point for nixos-install.
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mkdir -p /mnt
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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${optionalString includeSources ''
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /etc/nixos/nixos
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tar xjf ${nixosTarball}/nixos.tar.bz2 -C /etc/nixos/nixos
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mkdir -p /etc/nixos/nixpkgs
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tar xjf ${nixpkgsTarball}/nixpkgs.tar.bz2 -C /etc/nixos/nixpkgs
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chown -R root.root /etc/nixos
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''}
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# Provide a configuration for the CD/DVD itself, to allow users
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# to run nixos-rebuild to change the configuration of the
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# running system on the CD/DVD.
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cp ${dummyConfiguration} /etc/nixos/configuration.nix
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'';
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# Some more help text.
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services.mingetty.helpLine =
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''
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Log in as "root" with an empty password. ${
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if config.services.xserver.enable then
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"Type `start xserver' to start\nthe graphical user interface."
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else ""
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}
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'';
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# Include the firmware for various wireless cards.
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networking.enableRT73Firmware = true;
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networking.enableIntel2200BGFirmware = true;
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networking.enableIntel3945ABGFirmware = true;
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# To speed up installation a little bit, include the complete stdenv
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# in the Nix store on the CD.
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isoImage.storeContents = [ pkgs.stdenv pkgs.klibc pkgs.klibcShrunk ];
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# Allow sshd to be started manually through "start sshd". It should
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# not be started by default on the installation CD because the
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# default root password is empty.
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services.openssh.enable = true;
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jobs.sshd.startOn = pkgs.lib.mkOverrideTemplate 50 {} "";
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# Enable wpa_supplicant, but don't start it by default.
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networking.enableWLAN = true;
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jobs.wpa_supplicant.startOn = pkgs.lib.mkOverrideTemplate 50 {} "";
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}
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