depot/third_party/nixpkgs/pkgs/os-specific/linux/bpftools/default.nix

{ lib, stdenv
, libopcodes, libopcodes_2_38
, libbfd, libbfd_2_38
, elfutils, readline
, linuxPackages_latest, zlib
, python3, bison, flex
}:

stdenv.mkDerivation rec {
  pname = "bpftools";
  inherit (linuxPackages_latest.kernel) version src;

  nativeBuildInputs = [ python3 bison flex ];
  buildInputs = (if (lib.versionAtLeast version "5.20")
                 then [ libopcodes libbfd ]
                 else [ libopcodes_2_38 libbfd_2_38 ])
    ++ [ elfutils zlib readline ];

  preConfigure = ''
    patchShebangs scripts/bpf_doc.py

    cd tools/bpf
    substituteInPlace ./bpftool/Makefile \
      --replace '/usr/local' "$out" \
      --replace '/usr'       "$out" \
      --replace '/sbin'      '/bin'
  '';

  buildFlags = [ "bpftool" "bpf_asm" "bpf_dbg" ];

  installPhase = ''
    make -C bpftool install
    install -Dm755 -t $out/bin bpf_asm
    install -Dm755 -t $out/bin bpf_dbg
  '';

  meta = with lib; {
    description = "Debugging/program analysis tools for the eBPF subsystem";
    license     = [ licenses.gpl2 licenses.bsd2 ];
    platforms   = platforms.linux;
    maintainers = with maintainers; [ thoughtpolice ];
  };
}