rec { nixpkgsRel = "nixpkgs-0.11pre7834"; configuration = { boot = { autoDetectRootDevice = true; readOnlyRoot = true; # The label used to identify the installation CD. rootLabel = "NIXOS"; initrd = { enableSplashScreen = pkgs.stdenv.system != "x86_64-linux"; }; }; services = { sshd = { enable = false; }; xserver = { enable = false; }; extraJobs = [ # Unpack the NixOS/Nixpkgs sources to /etc/nixos. { name = "unpack-sources"; job = " start on startup script mkdir -p /etc/nixos/nixos tar xjf /nixos.tar.bz2 -C /etc/nixos/nixos tar xjf /nixpkgs.tar.bz2 -C /etc/nixos mv /etc/nixos/nixpkgs-* /etc/nixos/nixpkgs ln -sfn ../nixpkgs/pkgs /etc/nixos/nixos/pkgs end script "; } # Allow the user to do something useful on tty8 while waiting # for the installation to finish. { name = "rogue"; job = " start on udev stop on shutdown respawn ${pkgs.rogue}/bin/rogue < /dev/tty8 > /dev/tty8 2>&1 "; } ]; # And a background to go with that. ttyBackgrounds = { enable = pkgs.stdenv.system != "x86_64-linux"; specificThemes = [ { tty = 8; theme = pkgs.fetchurl { url = http://www.bootsplash.de/files/themes/Theme-GNU.tar.bz2; md5 = "61969309d23c631e57b0a311102ef034"; }; } ]; }; }; fonts = { enableFontConfig = false; }; installer = { nixpkgsURL = http://nix.cs.uu.nl/dist/nix/ + nixpkgsRel; }; }; system = import ../system/system.nix { inherit configuration; stage2Init = "/init"; }; pkgs = system.pkgs; # Since the CD is read-only, the mount points must be on disk. cdMountPoints = pkgs.runCommand "mount-points" {} " ensureDir $out cd $out mkdir proc sys tmp etc dev var mnt nix nix/var root touch $out/${configuration.boot.rootLabel} "; # We need a copy of the Nix expressions for Nixpkgs and NixOS on the # CD. We put them in a tarball because accessing that many small # files from a slow device like a CD-ROM takes too long. makeTarball = tarName: input: pkgs.runCommand "tarball" {inherit tarName;} " ensureDir $out (cd ${input} && tar cvfj $out/${tarName} . \\ --exclude '*~' \\ --exclude 'pkgs' --exclude 'result') "; # Put the current directory in a tarball (making sure to filter # out crap like the .svn directories). nixosTarball = let filter = name: type: let base = baseNameOf (toString name); in base != ".svn" && base != "result"; in makeTarball "nixos.tar.bz2" (builtins.filterSource filter ./..); # Get a recent copy of Nixpkgs. nixpkgsTarball = pkgs.fetchurl { url = configuration.installer.nixpkgsURL + "/" + nixpkgsRel + ".tar.bz2"; md5 = "844df61d5a1d02ca7de7af691a6279b5"; }; # The configuration file for isolinux. isolinuxCfg = pkgs.writeText "isolinux.cfg" " default linux prompt 1 timeout 60 label linux kernel vmlinuz append initrd=initrd ${toString (system.config.get ["boot" "kernelParams"])} "; # Create an ISO image containing the isolinux boot loader, the # kernel, the initrd produced above, and the closure of the stage 2 # init. rescueCD = import ../helpers/make-iso9660-image.nix { inherit (pkgs) stdenv perl cdrtools; isoName = "nixos.iso"; # Single files to be copied to fixed locations on the CD. contents = [ { source = pkgs.syslinux + "/lib/syslinux/isolinux.bin"; target = "isolinux/isolinux.bin"; } { source = isolinuxCfg; target = "isolinux/isolinux.cfg"; } { source = pkgs.kernel + "/vmlinuz"; target = "isolinux/vmlinuz"; } { source = system.initialRamdisk + "/initrd"; target = "isolinux/initrd"; } { source = cdMountPoints; target = "/"; } { source = nixosTarball + "/" + nixosTarball.tarName; target = "/" + nixosTarball.tarName; } { source = nixpkgsTarball; target = "/nixpkgs.tar.bz2"; } ]; # Closures to be copied to the Nix store on the CD. storeContents = [ { object = system.bootStage2; symlink = "/init"; } # To speed up the installation, provide the full stdenv. { object = pkgs.stdenv; symlink = "none"; } ]; bootable = true; bootImage = "isolinux/isolinux.bin"; }; }