From f6c804c927d46b61980d7132e0ff917d25a63fe3 Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Fri, 11 Oct 2024 16:09:52 +0100
Subject: [PATCH] scx_layered: package and ship

---
 flake.nix             |    2 +
 modules/sched_ext.nix |    2 +
 pkgs/scx/Cargo.lock   | 1672 +++++++++++++++++++++++++++++++++++++++++
 pkgs/scx/layered.nix  |   61 ++
 4 files changed, 1737 insertions(+)
 create mode 100644 pkgs/scx/Cargo.lock
 create mode 100644 pkgs/scx/layered.nix

diff --git a/flake.nix b/flake.nix
index 097e90f..150faae 100644
--- a/flake.nix
+++ b/flake.nix
@@ -30,6 +30,8 @@
       getSystemOverlays = system: nixpkgsConfig: [
         (final: prev: {
           unstable = nixpkgs-unstable.legacyPackages.${prev.system};
+
+          "scx_layered" = final.callPackage ./pkgs/scx/layered.nix { };
           "storj" = final.callPackage ./pkgs/storj.nix { };
         })
       ];
diff --git a/modules/sched_ext.nix b/modules/sched_ext.nix
index a8dc9b7..1753c9d 100644
--- a/modules/sched_ext.nix
+++ b/modules/sched_ext.nix
@@ -15,6 +15,8 @@ in
     }];
 
     boot.kernelPackages = if pkgs.linuxPackages.kernelAtLeast "6.12" then pkgs.linuxPackages else (if pkgs.linuxPackages_latest.kernelAtLeast "6.12" then pkgs.linuxPackages_latest else pkgs.unstable.linuxPackages_testing);
+
+    environment.systemPackages = with pkgs; [ scx_layered ];
   };
 }
 
diff --git a/pkgs/scx/Cargo.lock b/pkgs/scx/Cargo.lock
new file mode 100644
index 0000000..a7708aa
--- /dev/null
+++ b/pkgs/scx/Cargo.lock
@@ -0,0 +1,1672 @@
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diff --git a/pkgs/scx/layered.nix b/pkgs/scx/layered.nix
new file mode 100644
index 0000000..218c343
--- /dev/null
+++ b/pkgs/scx/layered.nix
@@ -0,0 +1,61 @@
+{ stdenv, lib, fetchFromGitHub, rustPlatform, pkg-config, llvmPackages, elfutils, zlib, ... }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "scx_layered";
+
+  src = fetchFromGitHub {
+    owner = "sched-ext";
+    repo = "scx";
+    rev = "d8150c1913890c79b408073f95e094285b5b4927";
+    hash = "sha256-Pd5h890jOyrOL0hIiRG91nlCST6cvhT8wpDTTGP3b74=";
+  };
+  version = "1.0.5-dirty";
+
+  cargoRoot = "scheds/rust/scx_layered";
+  cargoLock.lockFile = ./Cargo.lock;
+
+  postPatch = ''
+    rm Cargo.toml Cargo.lock
+    ln -fs ${./Cargo.lock} scheds/rust/scx_layered/Cargo.lock
+  '';
+
+  nativeBuildInputs = [ pkg-config llvmPackages.clang ];
+  buildInputs = [ elfutils zlib ];
+
+  # hardeningDisable = [
+  #   "zerocallusedregs"
+  # ];
+
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
+
+  preBuild = ''
+    cd scheds/rust/scx_layered
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+    cp target/${stdenv.targetPlatform.config}/release/scx_layered $out/bin/
+
+    runHook postInstall
+  '';
+
+  enableParallelBuilding = true;
+  dontStrip = true;
+  dontPatchELF = true;
+
+  meta = with lib; {
+    homepage = "https://github.com/sched-ext/scx";
+    description = "sched_ext schedulers and tools (scx_layered portion)";
+    license = licenses.gpl2Only;
+    platforms = platforms.linux;
+    maintainers = [{
+      email = "jake@hillion.co.uk";
+      matrix = "@jake:hillion.co.uk";
+      name = "Jake Hillion";
+      github = "JakeHillion";
+      githubId = 5712856;
+    }];
+  };
+}