Unverified Commit fa533ecb authored by Elliot Berman's avatar Elliot Berman
Browse files

nixos: tests: kernel-generic: Add kernelPackagesExtensions test 

Extend kernelPackages using kernelPackagesExtensions by adding a simple
"hello world" kernel module. Ensure it is loaded and the "Hello world!"
printk appears in dmesg.
parent b1fa8068

nixos/tests/all-tests.nix

+1 −1
Original line number Diff line number Diff line
@@ -777,7 +777,7 @@ in 
  keepalived = runTest ./keepalived.nix;

  keepassxc = runTest ./keepassxc.nix;

  kerberos = handleTest ./kerberos/default.nix { };

  kernel-generic = handleTest ./kernel-generic.nix { };

  kernel-generic = handleTest ./kernel-generic { };

  kernel-latest-ath-user-regd = runTest ./kernel-latest-ath-user-regd.nix;

  kernel-rust = handleTest ./kernel-rust.nix { };

  keter = runTest ./keter.nix;

nixos/tests/kernel-generic.nix→nixos/tests/kernel-generic/default.nix

+98 −0
Original line number Diff line number Diff line
@@ -7,9 +7,40 @@ 
with pkgs.lib;



let

  patchedPkgs = pkgs.extend (

    final: prev: {

      kernelPackagesExtensions = prev.kernelPackagesExtensions ++ [

        (

          finalKernelPackages: _:

          let

            finalKernel = finalKernelPackages.kernel;

          in

          {

            hello-world = final.stdenv.mkDerivation {

              name = "hello-module";



              nativeBuildInputs = finalKernel.moduleBuildDependencies;

              makeFlags = finalKernel.commonMakeFlags ++ [

                # Variable refers to the local Makefile.

                "KDIR=${finalKernel.dev}/lib/modules/${finalKernel.modDirVersion}/build"

                # Variable of the Linux src tree's main Makefile.

                "INSTALL_MOD_PATH=$(out)"

              ];



              buildFlags = [ "modules" ];

              installTargets = [ "modules_install" ];



              src = ./hello-world-src;

            };

          }

        )

      ];

    }

  );



  testsForLinuxPackages =

    linuxPackages:

    (import ./make-test-python.nix (

    (import ../make-test-python.nix (

      { pkgs, ... }:

      {

        name = "kernel-${linuxPackages.kernel.version}";
@@ -22,19 +53,25 @@ let 
        };



        nodes.machine =

          { ... }:

          { config, ... }:

          {

            boot.kernelPackages = linuxPackages;



            boot.extraModulePackages = [ config.boot.kernelPackages.hello-world ];



            boot.kernelModules = [ "hello" ];

          };



        testScript = ''

          assert "Linux" in machine.succeed("uname -s")

          assert "${linuxPackages.kernel.modDirVersion}" in machine.succeed("uname -a")



          assert "Hello world!" in machine.succeed("dmesg")

        '';

      }

    ) args);

  kernels = pkgs.linuxKernel.vanillaPackages // {

    inherit (pkgs.linuxKernel.packages)

  kernels = patchedPkgs.linuxKernel.vanillaPackages // {

    inherit (patchedPkgs.linuxKernel.packages)

      linux_6_12_hardened

      linux_rt_5_4

      linux_rt_5_10

nixos/tests/kernel-generic/hello-world-src/Makefile

0 → 100644
+15 −0
Original line number Diff line number Diff line 
ifneq ($(KERNELRELEASE),)

# kbuild part of makefile

obj-m := hello.o

else

# normal makefile

KDIR ?= /lib/modules/`uname -r`/build



.PHONY: modules

modules:

	$(MAKE) -C $(KDIR) M=$$PWD modules



.PHONY: modules_install

modules_install:

	$(MAKE) -C $(KDIR) M=$$PWD modules_install

endif

nixos/tests/kernel-generic/hello-world-src/hello.c

0 → 100644
+18 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: MIT

#include <linux/module.h>

#include <linux/printk.h>



static int hello(void)

{

	pr_info("Hello world!");

	return 0;

}

module_init(hello);



static void goodbye(void)

{

	pr_info("Goodbye");

}

module_exit(goodbye);



MODULE_LICENSE("MIT");