Function ExpandPath

FEXCore/Source/Interface/Config/Config.cpp:255–303

}

fextl::string ExpandPath(const fextl::string& ContainerPrefix, const fextl::string& PathName) {
  if (PathName.empty()) {
    return {};
  }

  // Expand home if it exists
  if (FHU::Filesystem::IsRelative(PathName)) {
    fextl::string Home = getenv("HOME") ?: "";
    // Home expansion only works if it is the first character
    // This matches bash behaviour
    if (PathName.starts_with("~/")) {
      Home.append(PathName.begin() + 1, PathName.end());
      return Home;
    }

    // Expand relative path to absolute
    char ExistsTempPath[PATH_MAX];
    char* RealPath = FHU::Filesystem::Absolute(PathName.c_str(), ExistsTempPath);
    if (RealPath && FHU::Filesystem::Exists(RealPath)) {
      return RealPath;
    }

    // Only return if it exists
    if (FHU::Filesystem::Exists(PathName)) {
      return PathName;
    }
  } else {
    // If the containerprefix and pathname isn't empty
    // Then we check if the pathname exists in our current namespace
    // If the path DOESN'T exist but DOES exist with the prefix applied
    // then redirect to the prefix
    //
    // This might not be expected behaviour for some edge cases but since
    // all paths aren't mounted inside the container, then it'll be fine
    //
    // Main catch case for this is the default thunk install folders
    // HostThunks: $CMAKE_INSTALL_PREFIX/lib/fex-emu/HostThunks/
    // GuestThunks: $CMAKE_INSTALL_PREFIX/share/fex-emu/GuestThunks/
    if (!ContainerPrefix.empty() && !PathName.empty()) {
      if (!FHU::Filesystem::Exists(PathName)) {
        auto ContainerPath = ContainerPrefix + PathName;
        if (FHU::Filesystem::Exists(ContainerPath)) {
          return ContainerPath;
        }
      }
    }
  }
  return {};
}

constexpr char ContainerManager[] = "/run/host/container-manager";