From c31fb8b184df21662f6cae2dfe3e07167a32a799 Mon Sep 17 00:00:00 2001
From: Minijackson <minijackson@riseup.net>
Date: Thu, 3 Oct 2019 17:56:17 +0200
Subject: nixos conf examples, how to override them and embedded usecase

---
 res/cross-build-1.nix | 44 ++++++++++++++++++++++++++++++++++++++++++++
 res/cross-build-2.nix | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 res/cross-build-1.nix
 create mode 100644 res/cross-build-2.nix

(limited to 'res')

diff --git a/res/cross-build-1.nix b/res/cross-build-1.nix
new file mode 100644
index 0000000..0598129
--- /dev/null
+++ b/res/cross-build-1.nix
@@ -0,0 +1,44 @@
+{ nixpkgs ? import <unstable>, ... }:
+
+let
+  pkgs = nixpkgs {
+    config = { };
+    # https://github.com/NixOS/nixpkgs/blob/master/lib/systems/examples.nix
+    crossSystem = {
+      config = "armv7l-unknown-linux-gnueabihf";
+    };
+    #overlays = [ (import ./overlay.nix) ];
+  };
+
+  config = { ... }:
+  {
+    environment.noXlibs = true;
+    documentation.enable = false;
+
+    # btrfs-progs fails to build
+    services.udisks2.enable = false;
+
+    fonts.fontconfig.enable = false;
+
+    nixpkgs.overlays = with pkgs.lib; singleton (const (super: {
+      polkit = super.polkit.override { withGnome = false; };
+
+      # pkcs11 needs opensc which depends on libXt? which fails to build and is X library
+      rng-tools = super.rng-tools.override { withPkcs11 = false; };
+
+      nix = super.nix.override { withAWS = false; };
+    }));
+
+    fileSystems."/".fsType = "tmpfs";
+
+    boot = {
+      loader.grub.enable = false;
+      enableContainers = false;
+      hardwareScan = false;
+    };
+
+    powerManagement.enable = false;
+  };
+
+in
+  pkgs.nixos config
diff --git a/res/cross-build-2.nix b/res/cross-build-2.nix
new file mode 100644
index 0000000..7225964
--- /dev/null
+++ b/res/cross-build-2.nix
@@ -0,0 +1,46 @@
+# This one is much better than the first
+#
+# TODO: get `nix build -f cross-build-2.nix vm` to work
+
+{ nixos ? import <unstable/nixos>, ... }:
+
+let
+  # https://github.com/NixOS/nixpkgs/blob/master/lib/systems/examples.nix
+  target = "armv7l-unknown-linux-gnueabihf";
+
+  configuration = { lib, ... }:
+  {
+    nixpkgs.crossSystem = lib.systems.elaborate { config = target; };
+    nixpkgs.overlays = with lib; singleton (const (super: {
+      polkit = super.polkit.override { withGnome = false; };
+
+      # pkcs11 needs opensc which depends on libXt? which fails to build and is X library
+      rng-tools = super.rng-tools.override { withPkcs11 = false; };
+
+      nix = super.nix.override { withAWS = false; };
+
+      gobject-introspection = super.callPackage /tmp/gobject-introspection.nix { inherit (darwin) cctools; };
+    }));
+
+
+    environment.noXlibs = true;
+    documentation.enable = false;
+
+    # btrfs-progs fails to build
+    services.udisks2.enable = false;
+
+    fonts.fontconfig.enable = false;
+
+    fileSystems."/".fsType = "tmpfs";
+
+    boot = {
+      loader.grub.enable = false;
+      enableContainers = false;
+      hardwareScan = false;
+    };
+
+    powerManagement.enable = false;
+  };
+
+in
+  nixos { inherit configuration; }
-- 
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