vendorize bcachefs kernel

flake.nix

@@ -24,6 +24,11 @@
       disko = pkgs.callPackage ./package.nix {};
       disko-doc = pkgs.callPackage ./doc.nix { };
       default = self.packages.${system}.disko;
+      # The way bcachefs support is maintained in nixpkgs is prone to breakage.
+      # That's why we need to maintain a fork here:
+      # https://github.com/NixOS/nixpkgs/issues/212086
+      linux-bcachefs = pkgs.callPackage ./linux-testing-bcachefs.nix {};
+      linuxPackages_bcachefs = pkgs.linuxPackagesFor self.packages.${pkgs.system}.linux-bcachefs;
     });
     # TODO: disable bios-related tests on aarch64...
     # Run checks: nix flake check -L

linux-testing-bcachefs.nix

@@ -0,0 +1,28 @@
+# nixpkgs's variant is broken because they have non-applying patches on top of the latest kernel,
+# instead of using kernel.
+
+{ lib
+, buildLinux
+, fetchFromGitHub
+, ...
+} @ args:
+buildLinux (args // {
+  # NOTE: bcachefs-tools should be updated simultaneously to preserve compatibility
+  version = "6.1.0-2022-12-29";
+  modDirVersion = "6.1.0";
+
+  src = fetchFromGitHub {
+    owner = "koverstreet";
+    repo = "bcachefs";
+    rev = "8f064a4cb5c7cce289b83d7a459e6d8620188b37";
+    sha256 = "sha256-UgWAbYToauAjGrgeS+o6N42/oW0roICJIoJlEAHBRPk=";
+  };
+
+  kernelPatches = (args.kernelPatches or []) ++ [{
+    name = "bcachefs-config";
+    patch = null;
+    extraConfig = ''
+      BCACHEFS_FS m
+    '';
+  }];
+} // (args.argsOverride or {}))

tests/bcachefs.nix

@@ -1,6 +1,9 @@
 { pkgs ? (import <nixpkgs> { })
 , makeDiskoTest ? (pkgs.callPackage ./lib.nix { }).makeDiskoTest
 }:
+let
+  linux-bcachefs = pkgs.callPackage ../linux-testing-bcachefs.nix {};
+in
 makeDiskoTest {
   disko-config = ../example/bcachefs.nix;
   extraTestScript = ''
@@ -12,7 +15,10 @@ makeDiskoTest {
     boot.supportedFilesystems = [ "bcachefs" ];
     # disable zfs so we can support latest kernel
     nixpkgs.overlays = [(final: super: {
-      zfs = super.zfs.overrideAttrs(_: {meta.platforms = [];});}
-    )];
+      zfs = super.zfs.overrideAttrs(_: {
+        meta.platforms = [];
+      });
+    })];
+    boot.kernelPackages = pkgs.lib.mkForce (pkgs.recurseIntoAttrs (pkgs.linuxPackagesFor linux-bcachefs));
   };
 }