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* Modularise the building of the installation CD/DVD. The module

Browse Source 
iso-image.nix contains the minimal stuff necessary to build a
  bootable ISO image containing the given configuration.  The idea is
  that this can be customised by providing additional modules, e.g. to
  add extra packages to the image.

  The ISO image is exported in the configuration attribute
  system.build.isoImage.  So it can be built as follows:

  $ nix-build lib/eval-config.nix \
      --arg configuration 'import ./modules/installer/cd-dvd/iso-image.nix' \
      -A config.system.build.isoImage


svn path=/nixos/branches/modular-nixos/; revision=15871
This commit is contained in:
Eelco Dolstra 2009-06-05 13:35:27 +00:00
parent a4fa62aaf0
commit e4e408293e
2 changed files with 90 additions and 3 deletions
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5
lib/make-iso9660-image.nix
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@ -1,4 +1,4 @@
{ stdenv, perl, cdrkit, nixpkgs
{ stdenv, perl, cdrkit, pathsFromGraph
, # The file name of the resulting ISO image.
isoName ? "cd.iso"
@ -37,7 +37,7 @@ stdenv.mkDerivation {
builder = ./make-iso9660-image.sh;
buildInputs = [perl cdrkit];
inherit isoName bootable bootImage compressImage volumeID;
inherit isoName bootable bootImage compressImage volumeID pathsFromGraph;
# !!! should use XML.
sources = map (x: x.source) contents;
@ -50,5 +50,4 @@ stdenv.mkDerivation {
# For obtaining the closure of `storeContents'.
exportReferencesGraph =
map (x: [("closure-" + baseNameOf x.object) x.object]) storeContents;
pathsFromGraph = "${nixpkgs}/pkgs/build-support/kernel/paths-from-graph.pl";
}

88
modules/installer/cd-dvd/iso-image.nix Normal file
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@ -0,0 +1,88 @@
# This module creates a bootable ISO image containing the given NixOS
# configuration. The derivation for the ISO image will be placed in
# config.system.build.isoImage.
{config, pkgs, ...}:
let
cdLabel = "NIXOS_INSTALLATION_CD";
# The configuration file for Grub.
grubCfg =
''
default 0
timeout 10
splashimage /boot/background.xpm.gz
title Boot from hard disk
root (hd0)
chainloader +1
title NixOS Installer / Rescue
kernel /boot/vmlinuz init=/init ${toString config.boot.kernelParams}
initrd /boot/initrd
'';
in
{
# In stage 1 of the boot, mount the CD/DVD as the root FS by label
# so that we don't need to know its device.
fileSystems =
[ { mountPoint = "/";
label = cdLabel;
}
];
# We need AUFS in the initrd to make the CD appear writable.
boot.extraModulePackages = [config.boot.kernelPackages.aufs];
boot.initrd.extraKernelModules = ["aufs"];
# Tell stage 1 of the boot to mount a tmpfs on top of the CD using
# AUFS. !!! It would be nicer to make the stage 1 init pluggable
# and move that bit of code here.
boot.isLiveCD = true;
# Create the ISO image.
system.build.isoImage = import ../../../lib/make-iso9660-image.nix {
inherit (pkgs) stdenv perl cdrkit pathsFromGraph;
#isoName = "${relName}-${platform}.iso";
bootable = true;
bootImage = "boot/grub/stage2_eltorito";
#compressImage = ...;
volumeID = cdLabel;
# Single files to be copied to fixed locations on the CD.
contents =
[ { source = "${pkgs.grub}/lib/grub/${if pkgs.stdenv.system == "i686-linux" then "i386-pc" else "x86_64-unknown"}/stage2_eltorito";
target = "boot/grub/stage2_eltorito";
}
{ source = pkgs.writeText "menu.lst" grubCfg;
target = "boot/grub/menu.lst";
}
{ source = config.boot.kernelPackages.kernel + "/vmlinuz";
target = "boot/vmlinuz";
}
{ source = config.system.build.initialRamdisk + "/initrd";
target = "boot/initrd";
}
{ source = config.boot.grubSplashImage;
target = "boot/background.xpm.gz";
}
];
# Closures to be copied to the Nix store on the CD.
storeContents =
[ { object = config.system.build.bootStage2;
symlink = "/init";
}
{ object = config.system.build.system;
symlink = "/system";
}
];
};
}