Initial commitHEADmaster

1 files changed, 90 insertions, 0 deletions

diff --git a/install.nix b/install.nix
new file mode 100644
index 0000000..f4186c7
--- /dev/null
+++ b/install.nix
@@ -0,0 +1,90 @@
+{ 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";
+    };
+  };
+}