depot/third_party/nixpkgs/pkgs/os-specific/linux/usbrelay/daemon.nix

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{ stdenv, usbrelay, python3, installShellFiles }:
let
python = python3.withPackages (ps: with ps; [ usbrelay-py paho-mqtt ]);
in
# This is a separate derivation, not just an additional output of
# usbrelay, because otherwise, we have a cyclic dependency between
# usbrelay (default.nix) and the python module (python.nix).
stdenv.mkDerivation rec {
pname = "usbrelayd";
inherit (usbrelay) src version;
postPatch = ''
substituteInPlace 'usbrelayd.service' \
--replace '/usr/bin/python3' "${python}/bin/python3" \
--replace '/usr/sbin/usbrelayd' "$out/bin/usbrelayd"
'';
nativeBuildInputs = [ installShellFiles ];
buildInputs = [ python ];
dontBuild = true;
installPhase = ''
runHook preInstall;
install -m 644 -D usbrelayd $out/bin/usbrelayd
install -m 644 -D usbrelayd.service $out/lib/systemd/system/usbrelayd.service
install -m 644 -D 50-usbrelay.rules $out/lib/udev/rules.d/50-usbrelay.rules
install -m 644 -D usbrelayd.conf $out/etc/usbrelayd.conf # include this as an example
installManPage usbrelayd.8
runHook postInstall
'';
meta = {
description = "USB Relay MQTT service";
inherit (usbrelay.meta) homepage license maintainers platforms;
};
}