155 lines
4.1 KiB
Nix
155 lines
4.1 KiB
Nix
# This module creates a bootable ISO image containing the given NixOS
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# configuration. The derivation for the ISO image will be placed in
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# config.system.build.isoImage.
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{config, pkgs, ...}:
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let
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options = {
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isoImage.isoName = pkgs.lib.mkOption {
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default = "cd.iso";
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description = ''
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Name of the generated ISO image file.
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'';
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};
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isoImage.compressImage = pkgs.lib.mkOption {
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default = false;
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description = ''
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Whether the ISO image should be compressed using
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<command>bzip2</command>.
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'';
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};
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isoImage.volumeID = pkgs.lib.mkOption {
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default = "NIXOS_BOOT_CD";
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description = ''
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Specifies the label or volume ID of the generated ISO image.
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Note that the label is used by stage 1 of the boot process to
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mount the CD, so it should be reasonably distinctive.
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'';
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};
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isoImage.contents = pkgs.lib.mkOption {
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example =
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[ { source = pkgs.memtest86 + "/memtest.bin";
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target = "boot/memtest.bin";
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}
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];
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description = ''
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This option lists files to be copied to fixed locations in the
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generated ISO image.
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'';
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};
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isoImage.storeContents = pkgs.lib.mkOption {
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example =
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[ { object = pkgs.stdenv;
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symlink = "/stdenv";
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}
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];
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description = ''
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This option lists additional derivations to be included in the
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Nix store in the generated ISO image.
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'';
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};
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};
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# The configuration file for Grub.
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grubCfg =
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''
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default 0
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timeout 10
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splashimage /boot/background.xpm.gz
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${config.boot.extraGrubEntries}
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'';
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in
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{
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require = options;
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# In stage 1 of the boot, mount the CD/DVD as the root FS by label
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# so that we don't need to know its device.
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fileSystems =
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[ { mountPoint = "/";
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label = config.isoImage.volumeID;
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}
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];
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# We need AUFS in the initrd to make the CD appear writable.
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boot.extraModulePackages = [config.boot.kernelPackages.aufs];
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boot.initrd.extraKernelModules = ["aufs"];
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# Tell stage 1 of the boot to mount a tmpfs on top of the CD using
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# AUFS. !!! It would be nicer to make the stage 1 init pluggable
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# and move that bit of code here.
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boot.isLiveCD = true;
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# Individual files to be included on the CD, outside of the Nix
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# store on the CD.
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isoImage.contents =
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[ { source = "${pkgs.grub}/lib/grub/${if pkgs.stdenv.system == "i686-linux" then "i386-pc" else "x86_64-unknown"}/stage2_eltorito";
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target = "/boot/grub/stage2_eltorito";
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}
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{ source = pkgs.writeText "menu.lst" grubCfg;
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target = "/boot/grub/menu.lst";
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}
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{ source = config.boot.kernelPackages.kernel + "/vmlinuz";
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target = "/boot/vmlinuz";
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}
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{ source = config.system.build.initialRamdisk + "/initrd";
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target = "/boot/initrd";
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}
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{ source = config.boot.grubSplashImage;
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target = "/boot/background.xpm.gz";
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}
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];
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# Closures to be copied to the Nix store on the CD, namely the init
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# script and the top-level system configuration directory.
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isoImage.storeContents =
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[ { object = config.system.build.bootStage2;
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symlink = "/init";
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}
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{ object = config.system.build.system;
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symlink = "/system";
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}
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];
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# The Grub menu.
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boot.extraGrubEntries =
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''
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title Boot from hard disk
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root (hd0)
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chainloader +1
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title NixOS Installer / Rescue
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kernel /boot/vmlinuz init=/init ${toString config.boot.kernelParams}
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initrd /boot/initrd
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'';
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# Create the ISO image.
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system.build.isoImage = import ../../../lib/make-iso9660-image.nix {
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inherit (pkgs) stdenv perl cdrkit pathsFromGraph;
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inherit (config.isoImage) isoName compressImage volumeID contents storeContents;
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bootable = true;
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bootImage = "/boot/grub/stage2_eltorito";
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};
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# After booting, register the contents of the Nix store on the CD in
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# the Nix database in the tmpfs.
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boot.postBootCommands =
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''
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${config.environment.nix}/bin/nix-store --load-db < /nix-path-registration
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rm /nix-path-registration
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'';
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}
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