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installer: simple PXE bootable NixOS installer

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The Nix store squashfs is stored inside the initrd instead of separately

(cherry picked from commit 976fd407796877b538c470d3a5253ad3e1f7bc68)
Signed-off-by: Domen Kožar <domen@dev.si>
This commit is contained in:
Nahum Shalman 2016-04-08 13:53:27 +00:00 • committed by Domen Kožar
parent ecfc523d32
commit 83c0aca062
5 changed files with 173 additions and 2 deletions
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91
nixos/modules/installer/netboot/netboot.nix Normal file
View file

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# This module creates netboot media containing the given NixOS
# configuration.
{ config, lib, pkgs, ... }:
with lib;
{
options = {
netboot.storeContents = mkOption {
example = literalExample "[ pkgs.stdenv ]";
description = ''
This option lists additional derivations to be included in the
Nix store in the generated netboot image.
'';
};
};
config = {
boot.loader.grub.version = 2;
# Don't build the GRUB menu builder script, since we don't need it
# here and it causes a cyclic dependency.
boot.loader.grub.enable = false;
boot.initrd.postMountCommands = ''
mkdir -p /mnt-root/nix/store
mount -t squashfs /nix-store.squashfs /mnt-root/nix/store
'';
# !!! Hack - attributes expected by other modules.
system.boot.loader.kernelFile = "bzImage";
environment.systemPackages = [ pkgs.grub2 pkgs.grub2_efi pkgs.syslinux ];
boot.consoleLogLevel = mkDefault 7;
fileSystems."/" =
{ fsType = "tmpfs";
options = [ "mode=0755" ];
};
boot.initrd.availableKernelModules = [ "squashfs" ];
boot.initrd.kernelModules = [ "loop" ];
# Closures to be copied to the Nix store, namely the init
# script and the top-level system configuration directory.
netboot.storeContents =
[ config.system.build.toplevel ];
# Create the squashfs image that contains the Nix store.
system.build.squashfsStore = import ../../../lib/make-squashfs.nix {
inherit (pkgs) stdenv squashfsTools perl pathsFromGraph;
storeContents = config.netboot.storeContents;
};
# Create the initrd
system.build.netbootRamdisk = pkgs.makeInitrd {
inherit (config.boot.initrd) compressor;
prepend = [ "${config.system.build.initialRamdisk}/initrd" ];
contents =
[ { object = config.system.build.squashfsStore;
symlink = "/nix-store.squashfs";
}
];
};
system.build.netbootIpxeScript = pkgs.writeTextDir "netboot.ipxe" "#!ipxe\nkernel bzImage init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}\ninitrd initrd\nboot";
boot.loader.timeout = 10;
boot.postBootCommands =
''
# After booting, register the contents of the Nix store
# in the Nix database in the tmpfs.
${config.nix.package}/bin/nix-store --load-db < /nix/store/nix-path-registration
# nixos-rebuild also requires a "system" profile and an
# /etc/NIXOS tag.
touch /etc/NIXOS
${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
'';
};
}