minimal-bootrap: init make-bootstrap-sources.nix

  # Pinned from https://github.com/oriansj/stage0-posix/commit/bdd3ee779adb9f4a299059d09e68dfedecfd4226

  version = "unstable-2023-04-24";

  # We don't have access to utilities such as fetchgit and fetchzip since they

  # would introduce a circular dependency. The only tool we have to fetch source

  # trees is `import <nix/fetchurl.nix>` with the unpack option, taking a

  # NAR (Nix ARchive) file as input. This requires source tarballs to be repackaged.

  rev = "bdd3ee779adb9f4a299059d09e68dfedecfd4226";

  # Packaged resources required for the first bootstrapping stage.

  # Contains source code and 256-byte hex0 binary seed.

  #

  # We don't have access to utilities such as fetchgit and fetchzip since this

  # is this is part of the bootstrap process and would introduce a circular

  # dependency. The only tool we have to fetch source trees is `import <nix/fetchurl.nix>`

  # with the unpack option, taking a NAR file as input. This requires source

  # tarballs to be repackaged.

  #

  # To build see `make-bootstrap-sources.nix`

  src = import <nix/fetchurl.nix> {

    url = "https://github.com/emilytrau/bootstrap-tools-nar-mirror/releases/download/2023-04-25/stage0-posix-${version}-source.nar.xz";

    url = "https://github.com/emilytrau/bootstrap-tools-nar-mirror/releases/download/2023-04-25/stage0-posix-${builtins.substring 0 7 rev}-source.nar.xz";

    hash = "sha256-hMLo32yqXiTXPyW1jpR5zprYzZW8lFQy6KMrkNQZ89I=";

    unpack = true;

  };

# Packaged resources required for the first bootstrapping stage.

# Contains source code and 256-byte hex0 binary seed.

#

# We don't have access to utilities such as fetchgit and fetchzip since this

# is this is part of the bootstrap process and would introduce a circular

# dependency. The only tool we have to fetch source trees is `import <nix/fetchurl.nix>`

# with the unpack option, taking a NAR file as input. This requires source

# tarballs to be repackaged.

#

# To build:

#

#   nix-build pkgs/os-specific/linux/minimal-bootstrap/stage0-posix/make-bootstrap-sources.nix

#   => ./result/stage0-posix-0000000-source.nar.xz

#

{ pkgs ? import ../../../../.. {} }:

let

  inherit (pkgs) runCommand fetchFromGitHub nix xz;

  pname = "stage0-posix";

  rev = "bdd3ee779adb9f4a299059d09e68dfedecfd4226";

  shortHash = builtins.substring 0 7 rev;

  src = fetchFromGitHub {

    owner = "oriansj";

    repo = pname;

    inherit rev;

    sha256 = "hMLo32yqXiTXPyW1jpR5zprYzZW8lFQy6KMrkNQZ89I=";

    fetchSubmodules = true;

  };

in

runCommand "${pname}-${shortHash}-source" {

  nativeBuildInputs = [ nix xz ];

} ''

  mkdir $out

  nix-store --dump ${src} | xz -c > "$out/${pname}-${shortHash}-source.nar.xz"

''