From e4e408293edbcc523470b4cbd7e3dd502c7b9ddb Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 5 Jun 2009 13:35:27 +0000
Subject: [PATCH] * Modularise the building of the installation CD/DVD.  The
 module   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
---
 lib/make-iso9660-image.nix             |  5 +-
 modules/installer/cd-dvd/iso-image.nix | 88 ++++++++++++++++++++++++++
 2 files changed, 90 insertions(+), 3 deletions(-)
 create mode 100644 modules/installer/cd-dvd/iso-image.nix

diff --git a/lib/make-iso9660-image.nix b/lib/make-iso9660-image.nix
index ea0cd1b4d223..51dce5eb4022 100644
--- a/lib/make-iso9660-image.nix
+++ b/lib/make-iso9660-image.nix
@@ -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";
 }
diff --git a/modules/installer/cd-dvd/iso-image.nix b/modules/installer/cd-dvd/iso-image.nix
new file mode 100644
index 000000000000..64f788993fe6
--- /dev/null
+++ b/modules/installer/cd-dvd/iso-image.nix
@@ -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";
+        }
+      ];
+  };
+}