121 lines
4.4 KiB
Nix
121 lines
4.4 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.kexec.justdoit;
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x = if cfg.nvme then "p" else "";
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in {
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options = {
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kexec.justdoit = {
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rootDevice = mkOption {
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type = types.str;
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default = "/dev/sda";
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description = "the root block device that justdoit will nuke from orbit and force nixos onto";
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};
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bootSize = mkOption {
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type = types.int;
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default = 256;
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description = "size of /boot in mb";
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};
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bootType = mkOption {
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type = types.enum [ "ext4" "vfat" "zfs" ];
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default = "ext4";
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};
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swapSize = mkOption {
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type = types.int;
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default = 1024;
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description = "size of swap in mb";
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};
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poolName = mkOption {
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type = types.str;
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default = "tank";
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description = "zfs pool name";
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};
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luksEncrypt = mkOption {
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type = types.bool;
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default = false;
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description = "encrypt all of zfs and swap";
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};
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uefi = mkOption {
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type = types.bool;
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default = false;
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description = "create a uefi install";
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};
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nvme = mkOption {
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type = types.bool;
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default = false;
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description = "rootDevice is nvme";
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};
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};
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};
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config = let
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mkBootTable = {
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ext4 = "mkfs.ext4 $NIXOS_BOOT -L NIXOS_BOOT";
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vfat = "mkfs.vfat $NIXOS_BOOT -n NIXOS_BOOT";
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zfs = "";
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};
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in lib.mkIf true {
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system.build.justdoit = pkgs.writeScriptBin "justdoit" ''
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#!${pkgs.stdenv.shell}
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set -e
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vgchange -a n
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wipefs -a ${cfg.rootDevice}
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dd if=/dev/zero of=${cfg.rootDevice} bs=512 count=10000
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sfdisk ${cfg.rootDevice} <<EOF
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label: gpt
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device: ${cfg.rootDevice}
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unit: sectors
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${lib.optionalString (cfg.bootType != "zfs") "1 : size=${toString (2048 * cfg.bootSize)}, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4"}
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${lib.optionalString (! cfg.uefi) "4 : size=4096, type=21686148-6449-6E6F-744E-656564454649"}
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2 : type=0FC63DAF-8483-4772-8E79-3D69D8477DE4
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EOF
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${if cfg.luksEncrypt then ''
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cryptsetup luksFormat ${cfg.rootDevice}${x}2
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cryptsetup open --type luks ${cfg.rootDevice}${x}2 root
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export ROOT_DEVICE=/dev/mapper/root
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'' else ''
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export ROOT_DEVICE=${cfg.rootDevice}${x}2
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''}
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${lib.optionalString (cfg.bootType != "zfs") "export NIXOS_BOOT=${cfg.rootDevice}${x}1"}
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mkdir -p /mnt
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${mkBootTable.${cfg.bootType}}
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zpool create -o ashift=12 -o altroot=/mnt ${cfg.poolName} $ROOT_DEVICE
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zfs create -o mountpoint=legacy ${cfg.poolName}/root
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zfs create -o mountpoint=legacy ${cfg.poolName}/home
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zfs create -o mountpoint=legacy ${cfg.poolName}/nix
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mount -t zfs ${cfg.poolName}/root /mnt/
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mkdir /mnt/{home,nix,boot}
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mount -t zfs ${cfg.poolName}/home /mnt/home/
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mount -t zfs ${cfg.poolName}/nix /mnt/nix/
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${lib.optionalString (cfg.bootType != "zfs") "mount $NIXOS_BOOT /mnt/boot/"}
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nixos-generate-config --root /mnt/
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hostId=$(echo $(head -c4 /dev/urandom | od -A none -t x4))
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cp ${./target-config.nix} /mnt/etc/nixos/configuration.nix
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cat > /mnt/etc/nixos/generated.nix <<EOF
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{ ... }:
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{
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${if cfg.uefi then ''
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boot.loader.grub.efiInstallAsRemovable = true;
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boot.loader.grub.efiSupport = true;
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boot.loader.grub.device = "nodev";
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'' else ''
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boot.loader.grub.device = "${cfg.rootDevice}";
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''}
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networking.hostId = "$hostId"; # required for zfs use
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${lib.optionalString cfg.luksEncrypt ''
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boot.initrd.luks.devices = [
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{ name = "root"; device = "${cfg.rootDevice}${x}2"; preLVM = true; }
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];
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''}
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}
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EOF
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nixos-install
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umount /mnt/home /mnt/nix ${lib.optionalString (cfg.bootType != "zfs") "/mnt/boot"} /mnt
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zpool export ${cfg.poolName}
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'';
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environment.systemPackages = [ config.system.build.justdoit ];
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boot.supportedFilesystems = [ "zfs" ];
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users.users.root.openssh.authorizedKeys.keys = [ "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCl3RTOHd5DLiVeUbUr/GSiKoRWknXQnbkIf+uNiFO+XxiqZVojPlumQUVhasY8UzDzj9tSDruUKXpjut50FhIO5UFAgsBeMJyoZbgY/+R+QKU00Q19+IiUtxeFol/9dCO+F4o937MC0OpAC10LbOXN/9SYIXueYk3pJxIycXwUqhYmyEqtDdVh9Rx32LBVqlBoXRHpNGPLiswV2qNe0b5p919IGcslzf1XoUzfE3a3yjk/XbWh/59xnl4V7Oe7+iQheFxOT6rFA30WYwEygs5As//ZYtxvnn0gA02gOnXJsNjOW9irlxOUeP7IOU6Ye3WRKFRR0+7PS+w8IJLag2xb" ];
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};
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}
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