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    Falcon package
  
        
  
    
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  | { stdenv, lib, pkgs, dpkg, | |
| openssl, libnl, zlib, | |
| fetchurl, autoPatchelfHook, buildFHSUserEnv, writeScript, ... }: | |
| let | |
| pname = "falcon-sensor"; | |
| version = "6.31.0-12803"; | |
| arch = "amd64"; | |
| src = /opt/CrowdStrike + "/ubuntu_${pname}_${version}_${arch}.deb"; | |
| falcon-sensor = stdenv.mkDerivation { | |
| inherit version arch src; | |
| name = pname; | |
| buildInputs = [ dpkg zlib autoPatchelfHook ]; | |
| sourceRoot = "."; | |
| unpackPhase = '' | |
| dpkg-deb -x $src . | |
| ''; | |
| installPhase = '' | |
| cp -r . $out | |
| ''; | |
| meta = with lib; { | |
| description = "Crowdstrike Falcon Sensor"; | |
| homepage = "https://www.crowdstrike.com/"; | |
| license = licenses.unfree; | |
| platforms = platforms.linux; | |
| maintainers = with maintainers; [ klden ]; | |
| }; | |
| }; | |
| in buildFHSUserEnv { | |
| name = "fs-bash"; | |
| targetPkgs = pkgs: [ libnl openssl zlib ]; | |
| extraInstallCommands = '' | |
| ln -s ${falcon-sensor}/* $out/ | |
| ''; | |
| runScript = "bash"; | |
| } | 
  
    
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  | { pkgs, ... }: | |
| let | |
| falcon = pkgs.callPackage ./falcon { }; | |
| startPreScript = pkgs.writeScript "init-falcon" '' | |
| #! ${pkgs.bash}/bin/sh | |
| /run/current-system/sw/bin/mkdir -p /opt/CrowdStrike | |
| ln -sf ${falcon}/opt/CrowdStrike/* /opt/CrowdStrike | |
| ${falcon}/bin/fs-bash -c "${falcon}/opt/CrowdStrike/falconctl -g --cid" | |
| ''; | |
| in { | |
| systemd.services.falcon-sensor = { | |
| enable = true; | |
| description = "CrowdStrike Falcon Sensor"; | |
| unitConfig.DefaultDependencies = false; | |
| after = [ "local-fs.target" ]; | |
| conflicts = [ "shutdown.target" ]; | |
| before = [ "sysinit.target" "shutdown.target" ]; | |
| serviceConfig = { | |
| ExecStartPre = "${startPreScript}"; | |
| ExecStart = "${falcon}/bin/fs-bash -c \"${falcon}/opt/CrowdStrike/falcond\""; | |
| Type = "forking"; | |
| PIDFile = "/run/falcond.pid"; | |
| Restart = "no"; | |
| TimeoutStopSec = "60s"; | |
| KillMode = "process"; | |
| }; | |
| wantedBy = [ "multi-user.target" ]; | |
| }; | |
| } | 
With this setup, I was able to get falcon running. Thank you!
This worked on falcon-sensor 7.17-0-17005, thanks @klDen !
I modified the src slightly so that I can keep the falcon-sensor deb in the same directory:
falcon/default.nix
{ stdenv, lib, pkgs, dpkg, openssl, libnl, zlib, fetchurl, autoPatchelfHook
, buildFHSEnv, writeScript, ... }:
let
  pname = "falcon-sensor";
  version = "7.17.0-17005";
  arch = "amd64";
  src = builtins.path { 
    path = ./${pname}_${version}_${arch}.deb;
    name = "${pname}_${version}_${arch}.deb";
  };
  falcon-sensor = stdenv.mkDerivation {
    inherit version arch src;
    name = pname;
    buildInputs = [ dpkg zlib autoPatchelfHook ];
    sourceRoot = ".";
    unpackPhase = ''
      dpkg-deb -x $src .
    '';
    installPhase = ''
      cp -r . $out    '';
    meta = with lib; {
      description = "Crowdstrike Falcon Sensor";
      homepage = "https://www.crowdstrike.com/";
      license = licenses.unfree;
      platforms = platforms.linux;
      maintainers = with maintainers; [ klden ];
    };
  };
in buildFHSEnv {
  name = "fs-bash";
  targetPkgs = pkgs: [ libnl openssl zlib ];
  extraInstallCommands = ''
    ln -s ${falcon-sensor}/* $out/
  '';
  runScript = "bash";
  
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Glad it worked well for you!