pkgs/tools/audio/yabridge/libyabridge-from-nix-profiles.patch

   1 diff --git a/src/chainloader/utils.cpp b/src/chainloader/utils.cpp
   2 index fa90b8f7..bd44d0ea 100644
   3 --- a/src/chainloader/utils.cpp
   4 +++ b/src/chainloader/utils.cpp
   5 @@ -29,8 +29,10 @@
   6  namespace fs = ghc::filesystem;
   7
   8  void* find_plugin_library(const std::string& name) {
   9 +    Logger logger = Logger::create_exception_logger();
  10 +
  11      // Just using a goto for this would probably be cleaner, but yeah...
  12 -    const auto impl = [&name]() -> void* {
  13 +    const auto impl = [&name, &logger]() -> void* {
  14          // If `name` exists right next to the Wine plugin host binary, then
  15          // we'll try loading that. Otherwise we'll fall back to regular
  16          // `dlopen()` for distro packaged versions of yabridge
  17 @@ -52,27 +54,28 @@ void* find_plugin_library(const std::string& name) {
  18              }
  19          }
  20
  21 -        if (void* handle = dlopen(name.c_str(), RTLD_LAZY | RTLD_LOCAL)) {
  22 -            return handle;
  23 +        auto nix_profiles = getenv("NIX_PROFILES");
  24 +        if (!nix_profiles || nix_profiles[0] == '\0') {
  25 +            logger.log("");
  26 +            logger.log("ERROR: 'NIX_PROFILES' environment variable is not set");
  27 +            logger.log("");
  28 +            return nullptr;
  29          }
  30
  31 -        // One last Hail Mary, in case ldconfig was not set up correctly. This
  32 -        // might be relevant for some of the `/usr/local/*` locations (although
  33 -        // you really, really shouldn't install yabridge there, please, thank
  34 -        // you). Yabridgectl searches through these same directories.
  35 -        for (const auto& lib_dir : {
  36 -                 "/usr/lib",
  37 -                 "/usr/lib/x86_64-linux-gnu",
  38 -                 "/usr/lib64",
  39 -                 "/usr/local/lib",
  40 -                 "/usr/local/lib/x86_64-linux-gnu",
  41 -                 "/usr/local/lib64",
  42 -             }) {
  43 -            const fs::path candidate = fs::path(lib_dir) / name;
  44 -            if (void* handle =
  45 -                    dlopen(candidate.c_str(), RTLD_LAZY | RTLD_LOCAL)) {
  46 +        // NIX_PROFILES is iterated in reverse from the most specific (the
  47 +        // user profile) to the least specific (the system profile).
  48 +        const std::string_view nix_profiles_view = nix_profiles;
  49 +        auto segment_end = nix_profiles_view.size();
  50 +        while (segment_end != std::string::npos) {
  51 +            const auto next_segment_end = nix_profiles_view.rfind(' ', segment_end - 1);
  52 +            const auto segment_begin = next_segment_end + 1;
  53 +            const auto profile = nix_profiles_view.substr(segment_begin, segment_end - segment_begin);
  54 +            const auto candidate = fs::path(profile) / "lib" / name;
  55 +            if (auto handle = dlopen(candidate.c_str(), RTLD_LAZY | RTLD_LOCAL)) {
  56                  return handle;
  57              }
  58 +
  59 +            segment_end = next_segment_end;
  60          }
  61
  62          return nullptr;
  63 @@ -82,8 +85,6 @@ void* find_plugin_library(const std::string& name) {
  64      if (!handle) {
  65          const fs::path this_plugin_path = get_this_file_location();
  66
  67 -        Logger logger = Logger::create_exception_logger();
  68 -
  69          logger.log("");
  70          logger.log("Could not find '" + name + "'");
  71          logger.log("");