263 lines
7.9 KiB
Nix
263 lines
7.9 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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with pkgs.lib;
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let
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options = {
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isoImage.isoName = mkOption {
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default = "${config.isoImage.isoName}.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.isoBaseName = mkOption {
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default = "nixos";
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description = ''
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Prefix of the name of the generated ISO image file.
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'';
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};
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isoImage.compressImage = 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 = 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 = 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 = mkOption {
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example = [pkgs.stdenv];
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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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isoImage.includeSystemBuildDependencies = mkOption {
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default = false;
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example = true;
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description = ''
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Set this option to include all the needed sources etc in the
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image. It significantly increases image size. Use that when
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you want to be able to keep all the sources needed to build your
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system or when you are going to install the system on a computer
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with slow on non-existent network connection.
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'';
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};
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};
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# The Grub image.
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grubImage = pkgs.runCommand "grub_eltorito" {}
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''
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${pkgs.grub2}/bin/grub-mkimage -O i386-pc -o tmp biosdisk iso9660 help linux linux16 chain gfxterm vbe png jpeg
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cat ${pkgs.grub2}/lib/grub/*/cdboot.img tmp > $out
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''; # */
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# The configuration file for Grub.
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grubCfg =
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''
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set default=${builtins.toString config.boot.loader.grub.default}
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set timeout=${builtins.toString config.boot.loader.grub.timeout}
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if loadfont /boot/grub/unicode.pf2; then
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set gfxmode=640x480
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insmod gfxterm
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insmod vbe
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terminal_output gfxterm
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insmod png
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if background_image /boot/grub/splash.png; then
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set color_normal=white/black
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set color_highlight=black/white
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else
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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fi
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${config.boot.loader.grub.extraEntries}
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'';
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in
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{
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require = options;
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boot.loader.grub.version = 2;
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# Don't build the GRUB menu builder script, since we don't need it
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# here and it causes a cyclic dependency.
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boot.loader.grub.enable = false;
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# !!! Hack - attributes expected by other modules.
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system.build.menuBuilder = "true";
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system.boot.loader.kernelFile = "bzImage";
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environment.systemPackages = [ pkgs.grub2 ];
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# In stage 1 of the boot, mount the CD as the root FS by label so
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# that we don't need to know its device. We pass the label of the
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# root filesystem on the kernel command line, rather than in
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# `fileSystems' below. This allows CD-to-USB converters such as
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# UNetbootin to rewrite the kernel command line to pass the label or
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# UUID of the USB stick. It would be nicer to write
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# `root=/dev/disk/by-label/...' here, but UNetbootin doesn't
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# recognise that.
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boot.kernelParams = [ "root=LABEL=${config.isoImage.volumeID}" ];
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# Note that /dev/root is a symlink to the actual root device
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# specified on the kernel command line, created in the stage 1 init
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# script.
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fileSystems =
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[ { mountPoint = "/";
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device = "/dev/root";
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}
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{ mountPoint = "/nix/store";
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fsType = "squashfs";
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device = "/nix-store.squashfs";
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options = "loop";
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neededForBoot = true;
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}
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];
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# We need squashfs in the initrd to mount the compressed Nix store,
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# and aufs to make the root filesystem appear writable.
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boot.extraModulePackages =
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if config.boot.kernelPackages.aufs == null then
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abort "This kernel doesn't have aufs enabled"
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else
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[ config.boot.kernelPackages.aufs ];
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boot.initrd.availableKernelModules = [ "aufs" "squashfs" "iso9660" ];
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boot.initrd.kernelModules = [ "loop" ];
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# In stage 1, mount a tmpfs on top of / (the ISO image) and
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# /nix/store (the squashfs image) to make this a live CD.
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boot.initrd.postMountCommands =
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''
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mkdir /mnt-root-tmpfs
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mount -t tmpfs -o "mode=755" none /mnt-root-tmpfs
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mkdir /mnt-root-union
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mount -t aufs -o dirs=/mnt-root-tmpfs=rw:$targetRoot=ro none /mnt-root-union
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targetRoot=/mnt-root-union
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mkdir /mnt-store-tmpfs
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mount -t tmpfs -o "mode=755" none /mnt-store-tmpfs
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mkdir -p $targetRoot/nix/store
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mount -t aufs -o dirs=/mnt-store-tmpfs=rw:/mnt-root/nix/store=ro none /mnt-root-union/nix/store
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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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[ config.system.build.toplevel ] ++
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optional config.isoImage.includeSystemBuildDependencies
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config.system.build.toplevel.drvPath;
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# Create the squashfs image that contains the Nix store.
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system.build.squashfsStore = import ../../../lib/make-squashfs.nix {
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inherit (pkgs) stdenv squashfsTools perl pathsFromGraph;
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storeContents = config.isoImage.storeContents;
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};
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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 = grubImage;
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target = "/boot/grub/grub_eltorito";
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}
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{ source = pkgs.writeText "grub.cfg" grubCfg;
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target = "/boot/grub/grub.cfg";
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}
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{ source = config.boot.kernelPackages.kernel + "/bzImage";
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target = "/boot/bzImage";
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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 = "${pkgs.grub2}/share/grub/unicode.pf2";
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target = "/boot/grub/unicode.pf2";
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}
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{ source = config.boot.loader.grub.splashImage;
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target = "/boot/grub/splash.png";
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}
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{ source = config.system.build.squashfsStore;
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target = "/nix-store.squashfs";
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}
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{ # Quick hack: need a mount point for the store.
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source = pkgs.runCommand "empty" {} "ensureDir $out";
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target = "/nix/store";
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}
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];
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# The Grub menu.
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boot.loader.grub.extraEntries =
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''
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menuentry "NixOS Installer / Rescue" {
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linux /boot/bzImage init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}
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initrd /boot/initrd
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}
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menuentry "Boot from hard disk" {
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set root=(hd0)
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chainloader +1
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}
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'';
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boot.loader.grub.timeout = 10;
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# Create the ISO image.
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system.build.isoImage = import ../../../lib/make-iso9660-image.nix {
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inherit (pkgs) stdenv perl cdrkit pathsFromGraph;
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inherit (config.isoImage) isoName compressImage volumeID contents;
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bootable = true;
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bootImage = "/boot/grub/grub_eltorito";
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};
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boot.postBootCommands =
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''
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# After booting, register the contents of the Nix store on the
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# CD in the Nix database in the tmpfs.
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${config.environment.nix}/bin/nix-store --load-db < /nix/store/nix-path-registration
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# nixos-rebuild also requires a "system" profile and an
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# /etc/NIXOS tag.
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touch /etc/NIXOS
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${config.environment.nix}/bin/nix-env -p /nix/var/nix/profiles/system --set /var/run/current-system
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'';
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}
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