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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.kexec.justdoit;
in {
options = {
kexec.justdoit = {
rootDevice = mkOption {
type = types.str;
default = "/dev/sda";
description = "the root block device that justdoit will nuke from orbit and force nixos onto";
};
bootSize = mkOption {
type = types.int;
default = 256;
description = "size of /boot in mb";
};
swapSize = mkOption {
type = types.int;
default = 1024;
description = "size of swap in mb";
};
};
};
config = lib.mkIf true {
system.build.justdoit = pkgs.writeScriptBin "justdoit" ''
#!${pkgs.stdenv.shell}
set -e
vgchange -a n
dd if=/dev/zero of=${cfg.rootDevice} bs=512 count=10000
sfdisk ${cfg.rootDevice} <<EOF
label: dos
device: ${cfg.rootDevice}
unit: sectors
${cfg.rootDevice}1 : size=${toString (2048 * cfg.bootSize)}, type=83
${cfg.rootDevice}2 : size=${toString (2048 * cfg.swapSize)}, type=82
${cfg.rootDevice}3 : type=83
EOF
export ROOT_DEVICE=${cfg.rootDevice}3
export SWAP_DEVICE=${cfg.rootDevice}2
mkdir -p /mnt
mkfs.ext4 ${cfg.rootDevice}1 -L NIXOS_BOOT
mkswap $SWAP_DEVICE -L NIXOS_SWAP
mkfs.ext4 $ROOT_DEVICE -L NIXOS_ROOT
swapon $SWAP_DEVICE
mount $ROOT_DEVICE /mnt/
mkdir -p /mnt/boot/
mount -t ext4 ${cfg.rootDevice}1 /mnt/boot/
nixos-generate-config --root /mnt/
hostId=$(echo $(head -c4 /dev/urandom | od -A none -t x4))
cp ${./target-config.nix} /mnt/etc/nixos/configuration.nix
cat > /mnt/etc/nixos/generated.nix <<EOF
{ ... }: {
boot.loader.grub.device = "${cfg.rootDevice}";
networking.hostId = "$hostId"; # required for zfs use
}
EOF
nixos-install --no-root-passwd -j 4
reboot
'';
environment.systemPackages = [ config.system.build.justdoit ];
systemd.services.performInstall = {
requiredBy = [ "multi-user.target" ];
path = with pkgs; [
nixStable lvm2 utillinux e2fsprogs
] ++ (with config.system.build; [
nixos-install nixos-generate-config
]);
environment.NIX_PATH = lib.concatStringsSep ":" config.nix.nixPath;
script = "${config.system.build.justdoit}/bin/justdoit";
};
};
}
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