nixpkgs/configuration/rescue-cd.nix

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rec {
nixpkgsRel = "nixpkgs-0.11pre7628";
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;
};
# Allow the user to do something useful on tty8 while waiting
# for the installation to finish.
extraJobs = [
{ 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 = "e7fe1793e69ff5072eb5987e7b7ccd47";
};
# 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 cdrtools;
isoName = "nixos.iso";
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";
}
];
init = system.bootStage2;
bootable = true;
bootImage = "isolinux/isolinux.bin";
};
}