installer: simple PXE bootable NixOS installer

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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@ -0,0 +1,20 @@
# This module contains the basic configuration for building netboot
# images
{ config, lib, pkgs, ... }:
with lib;
{
imports =
[ ./netboot.nix
# Profiles of this basic netboot media
../../profiles/all-hardware.nix
../../profiles/base.nix
../../profiles/installation-device.nix
];
# Allow the user to log in as root without a password.
users.extraUsers.root.initialHashedPassword = "";
}

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@ -0,0 +1,10 @@
# This module defines a small netboot environment.
{ config, lib, ... }:
{
imports =
[ ./netboot-base.nix
../../profiles/minimal.nix
];
}

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@ -0,0 +1,91 @@
# 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
'';
};
}

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@ -104,6 +104,20 @@ in rec {
initialRamdisk = buildFromConfig ({ pkgs, ... }: { }) (config: config.system.build.initialRamdisk);
netboot = let build = (import lib/eval-config.nix {
system = "x86_64-linux";
modules = [
./modules/installer/netboot/netboot-minimal.nix
versionModule
];
}).config.system.build;
in
pkgs.symlinkJoin "netboot" [
build.netbootRamdisk
build.kernel
build.netbootIpxeScript
];
iso_minimal = forAllSystems (system: makeIso {
module = ./modules/installer/cd-dvd/installation-cd-minimal.nix;
type = "minimal";

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@ -44,5 +44,41 @@ in {
usb => glob("${iso}/iso/*.iso"),
bios => '${pkgs.OVMF}/FV/OVMF.fd'
'';
}
netboot = let
config = (import ../lib/eval-config.nix {
inherit system;
modules =
[ ../modules/installer/netboot/netboot.nix
../modules/testing/test-instrumentation.nix
{ key = "serial"; }
];
}).config;
ipxeScriptDir = pkgs.writeTextFile {
name = "ipxeScriptDir";
text = ''
#!ipxe
dhcp
kernel bzImage init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} console=ttyS0
initrd initrd
boot
'';
destination = "/boot.ipxe";
};
ipxeBootDir = pkgs.symlinkJoin "ipxeBootDir" [
config.system.build.netbootRamdisk
config.system.build.kernel
ipxeScriptDir
];
in
makeTest {
name = "boot-netboot";
nodes = { };
testScript =
''
my $machine = createMachine({ qemuFlags => '-boot order=n -net nic,model=e1000 -net user,tftp=${ipxeBootDir}/,bootfile=boot.ipxe -m 2000M' });
$machine->start;
$machine->waitForUnit("multi-user.target");
$machine->shutdown;
'';
};
}