From 001acc5a523db45414ebfdca808e308f027e39b5 Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Fri, 29 Nov 2019 13:43:27 +0100
Subject: ma iso: add justdoit,target-config.nix

---
 makefu/1systems/iso/justdoit.nix | 128 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 makefu/1systems/iso/justdoit.nix

(limited to 'makefu/1systems/iso/justdoit.nix')

diff --git a/makefu/1systems/iso/justdoit.nix b/makefu/1systems/iso/justdoit.nix
new file mode 100644
index 00000000..7947953f
--- /dev/null
+++ b/makefu/1systems/iso/justdoit.nix
@@ -0,0 +1,128 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.kexec.justdoit;
+  x = if cfg.nvme then "p" else "";
+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";
+      };
+      bootType = mkOption {
+        type = types.enum [ "ext4" "vfat" "zfs" ];
+        default = "ext4";
+      };
+      swapSize = mkOption {
+        type = types.int;
+        default = 1024;
+        description = "size of swap in mb";
+      };
+      poolName = mkOption {
+        type = types.str;
+        default = "tank";
+        description = "zfs pool name";
+      };
+      luksEncrypt = mkOption {
+        type = types.bool;
+        default = false;
+        description = "encrypt all of zfs and swap";
+      };
+      uefi = mkOption {
+        type = types.bool;
+        default = false;
+        description = "create a uefi install";
+      };
+      nvme = mkOption {
+        type = types.bool;
+        default = false;
+        description = "rootDevice is nvme";
+      };
+    };
+  };
+  config = let
+    mkBootTable = {
+      ext4 = "mkfs.ext4 $NIXOS_BOOT -L NIXOS_BOOT";
+      vfat = "mkfs.vfat $NIXOS_BOOT -n NIXOS_BOOT";
+      zfs = "";
+    };
+  in lib.mkIf true {
+    system.build.justdoit = pkgs.writeScriptBin "justdoit" ''
+      #!${pkgs.stdenv.shell}
+      set -e
+      vgchange -a n
+      wipefs -a ${cfg.rootDevice}
+      dd if=/dev/zero of=${cfg.rootDevice} bs=512 count=10000
+      sfdisk ${cfg.rootDevice} <<EOF
+      label: gpt
+      device: ${cfg.rootDevice}
+      unit: sectors
+      ${lib.optionalString (cfg.bootType != "zfs") "1 : size=${toString (2048 * cfg.bootSize)}, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4"}
+      ${lib.optionalString (! cfg.uefi) "4 : size=4096, type=21686148-6449-6E6F-744E-656564454649"}
+      2 : size=${toString (2048 * cfg.swapSize)}, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
+      3 : type=0FC63DAF-8483-4772-8E79-3D69D8477DE4
+      EOF
+      ${if cfg.luksEncrypt then ''
+        cryptsetup luksFormat ${cfg.rootDevice}${x}2
+        cryptsetup open --type luks ${cfg.rootDevice}${x}2 swap
+        cryptsetup luksFormat ${cfg.rootDevice}${x}3
+        cryptsetup open --type luks ${cfg.rootDevice}${x}3 root
+        export ROOT_DEVICE=/dev/mapper/root
+        export SWAP_DEVICE=/dev/mapper/swap
+      '' else ''
+        export ROOT_DEVICE=${cfg.rootDevice}${x}3
+        export SWAP_DEVICE=${cfg.rootDevice}${x}2
+      ''}
+      ${lib.optionalString (cfg.bootType != "zfs") "export NIXOS_BOOT=${cfg.rootDevice}${x}1"}
+      mkdir -p /mnt
+      ${mkBootTable.${cfg.bootType}}
+      mkswap $SWAP_DEVICE -L NIXOS_SWAP
+      zpool create -o ashift=12 -o altroot=/mnt ${cfg.poolName} $ROOT_DEVICE
+      zfs create -o mountpoint=legacy ${cfg.poolName}/root
+      zfs create -o mountpoint=legacy ${cfg.poolName}/home
+      zfs create -o mountpoint=legacy ${cfg.poolName}/nix
+      swapon $SWAP_DEVICE
+      mount -t zfs ${cfg.poolName}/root /mnt/
+      mkdir /mnt/{home,nix,boot}
+      mount -t zfs ${cfg.poolName}/home /mnt/home/
+      mount -t zfs ${cfg.poolName}/nix /mnt/nix/
+      ${lib.optionalString (cfg.bootType != "zfs") "mount $NIXOS_BOOT /mnt/boot/"}
+      nixos-generate-config --root /mnt/
+      hostId=$(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
+      { ... }:
+      {
+        ${if cfg.uefi then ''
+          boot.loader.grub.efiInstallAsRemovable = true;
+          boot.loader.grub.efiSupport = true;
+          boot.loader.grub.device = "nodev";
+        '' else ''
+          boot.loader.grub.device = "${cfg.rootDevice}";
+        ''}
+        networking.hostId = "$hostId"; # required for zfs use
+      ${lib.optionalString cfg.luksEncrypt ''
+        boot.initrd.luks.devices = [
+          { name = "swap"; device = "${cfg.rootDevice}${x}2"; preLVM = true; }
+          { name = "root"; device = "${cfg.rootDevice}${x}3"; preLVM = true; }
+        ];
+      ''}
+      }
+      EOF
+      nixos-install
+      umount /mnt/home /mnt/nix ${lib.optionalString (cfg.bootType != "zfs") "/mnt/boot"} /mnt
+      zpool export ${cfg.poolName}
+      swapoff $SWAP_DEVICE
+    '';
+    environment.systemPackages = [ config.system.build.justdoit ];
+    boot.supportedFilesystems = [ "zfs" ];
+  };
+}
-- 
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