Stream: nixos

Topic: Darwin's linux-builder

Srid (Feb 22 2024 at 18:00):

Srid said:

The linux-builder in nix-darwin would streamline it even further,

https://nixcademy.com/2024/02/12/macos-linux-builder/

However, it:

• does not support rosetta
• does not build packages with IFD

Turns out I'm wrong here re: IFD.

This won't work:

nix --option system aarch64-linux build -L

But this will:

nix build -L .#packages.aarch64-linux.default

cf. https://github.com/NixOS/nixpkgs/issues/39664

That said, I still couldn't get x86_64-linux builds to work. It requires improving the nix-darwin linux builder to take arbitrary configuration, so I can set a binfmt.emulatedSystems.

Notification Bot (Feb 22 2024 at 18:00):

A message was moved here from #nixos > Home CI machine (portable) by Srid.

Srid (Feb 22 2024 at 18:09):

What will it take to merge all these PRs?

image.png

Srid (Feb 22 2024 at 18:45):

x86 builds

Using https://github.com/LnL7/nix-darwin/pull/878

I can get x86 packages to build via linux-builder. The config,

  # To build Linux derivations whilst on macOS.
  nix.linux-builder = {
    enable = true;
    systems = [
      "x86_64-linux"
      "aarch64-linux"
    ];
    config = { lib, ... }: {
      boot.binfmt.emulatedSystems = [ "x86_64-linux" ];
      virtualisation = {
        # Larger linux-builder cores, ram, and disk.
        cores = 6;
        memorySize = lib.mkForce (1024 * 16);
        diskSize = lib.mkForce (1024 * 1); # In MB.
      };
    };
  };

Incidentally, I gain the impression that the linux-builder is draining my battery faster than the parallels VM.

Srid (Feb 22 2024 at 19:21):

Timing for a) macOS native, b) arm linux, c) x86 emulation when building haskell-template. I'll do a thorough benchmark latter.

image.png

Srid (Feb 23 2024 at 14:59):

Got something working on macOS. Along with https://github.com/srid/nixci/pull/39 I can now build Emanote (PR) on arm Linux and mac, using the builders hosted on the same host (macbook),

jobs:
  nix:
    runs-on: self-hosted
    strategy:
      matrix:
        # TODO: Disablig x86_64-linux for now, as it is causing qemu segfault.
        # Fix treefmt check causing qemu segfault: https://nixos.zulipchat.com/#narrow/stream/413948-nixos/topic/QEMU.20internal.20SIGSEGV
        system: [aarch64-linux, aarch64-darwin]
    steps:
      - uses: actions/checkout@v4
      - name: Build Nix
        run: |
          nixci --build-systems "github:nix-systems/${{ matrix.system }}"

Last updated: Nov 15 2024 at 12:33 UTC