Created expression to keep in sync with rescue-cd.nix; I do not want to make creating smaller CD images more difficult.

svn path=/nixos/trunk/; revision=10559

configuration/rescue-cd-configurable.nix

@@ -139,6 +139,8 @@ rec {
             start on startup
             script
             export PATH=${pkgs.gnutar}/bin:${pkgs.bzip2}/bin:$PATH
+
+	    mkdir -p /mnt
         
             ${system.nix}/bin/nix-store --load-db < /nix-path-registration
         
@@ -287,15 +289,6 @@ rec {
     else pkgs.writeText "dummy-manual" "Manual not included in this build!";
  
  
-  # 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 bin ${if addUsers != "" then "home" else ""}
-    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.
@@ -373,10 +366,6 @@ rec {
           source = system.config.boot.grubSplashImage;
           target = "boot/background.xpm.gz";
         }
-        { 
-          source = cdMountPoints;
-          target = "/";
-        }
         { 
           source = nixosTarball + "/" + nixosTarball.tarName;
           target = "/install/" + nixosTarball.tarName;

configuration/rescue-cd-replacement.nix

@@ -0,0 +1,70 @@
+{platform ? __currentSystem} : 
+let 
+  isoFun = import ./rescue-cd-configurable.nix;
+in (isoFun {
+   inherit platform;
+   lib = (import ../pkgs/lib);
+
+   networkNixpkgs = "";
+   manualEnabled = false;
+   rogueEnabled = false;
+   sshdEnabled = false;
+   fontConfigEnabled = false;
+   sudoEnable = false;
+   includeMemtest = false;
+   includeStdenv = false;
+   includeBuildDeps = false;
+
+   extraInitrdKernelModules = [
+     # The initrd should contain any modules necessary for
+     # mounting the CD.
+
+     # SATA/PATA support.
+     "ahci"
+    
+     "ata_piix"
+    
+     "sata_inic162x" "sata_nv" "sata_promise" "sata_qstor"
+     "sata_sil" "sata_sil24" "sata_sis" "sata_svw" "sata_sx4"
+     "sata_uli" "sata_via" "sata_vsc"
+    
+     "pata_ali" "pata_amd" "pata_artop" "pata_atiixp"
+     "pata_cs5520" "pata_cs5530" "pata_cs5535" "pata_efar"
+     "pata_hpt366" "pata_hpt37x" "pata_hpt3x2n" "pata_hpt3x3"
+     "pata_it8213" "pata_it821x" "pata_jmicron" "pata_marvell"
+     "pata_mpiix" "pata_netcell" "pata_ns87410" "pata_oldpiix"
+     "pata_pcmcia" "pata_pdc2027x" "pata_qdi" "pata_rz1000"
+     "pata_sc1200" "pata_serverworks" "pata_sil680" "pata_sis"
+     "pata_sl82c105" "pata_triflex" "pata_via"
+     # "pata_winbond" <-- causes timeouts in sd_mod
+
+     # SCSI support (incomplete).
+     "3w-9xxx" "3w-xxxx" "aic79xx" "aic7xxx" "arcmsr" 
+
+     # USB support, especially for booting from USB CD-ROM
+     # drives.  Also include USB keyboard support for when
+     # something goes wrong in stage 1.
+     "ehci_hcd"
+     "ohci_hcd"
+     "usbhid"
+     "usb_storage"
+
+     # Firewire support.  Not tested.
+     "ohci1394" "sbp2"
+
+     # Wait for SCSI devices to appear.
+     "scsi_wait_scan"
+
+     # Needed for live-CD operation.
+     "aufs"
+   ];
+  packages = pkgs: [
+    pkgs.vim
+    pkgs.subversion # for nixos-checkout
+    pkgs.w3m # needed for the manual anyway
+    pkgs.gdb # for debugging Nix
+    pkgs.testdisk # useful for repairing boot problems
+    pkgs.mssys # for writing Microsoft boot sectors / MBRs
+  ];
+
+}).rescueCD