test.cpp

// See llvm.org/PR35078
TEST_CASE(test_PR35078)
{
  using namespace std::experimental::filesystem;
    scoped_test_env env;
    const path testFiles[] = {
        env.create_dir("dir1"),
        env.create_dir("dir1/dir2"),
        env.create_dir("dir1/dir2/dir3"),
        env.create_file("dir1/file1"),
        env.create_file("dir1/dir2/dir3/file2")
    };
    const path startDir = testFiles[0];
    const path permDeniedDir = testFiles[1];
    const path nestedDir = testFiles[2];
    const path nestedFile = testFiles[3];

    // Change the permissions so we can no longer iterate
    permissions(permDeniedDir,
                perms::remove_perms|perms::group_exec
               |perms::owner_exec|perms::others_exec);

    const std::error_code eacess_ec =
        std::make_error_code(std::errc::permission_denied);
    std::error_code ec = GetTestEC();

    const recursive_directory_iterator endIt;

    auto SetupState = [&](bool AllowEAccess, bool& SeenFile3) {
      SeenFile3 = false;
      auto Opts = AllowEAccess ? directory_options::skip_permission_denied
          : directory_options::none;
      recursive_directory_iterator it(startDir, Opts, ec);
      while (!ec && it != endIt && *it != nestedDir) {
        if (*it == nestedFile)
          SeenFile3 = true;
        it.increment(ec);
      }
      return it;
    };

    {
      bool SeenNestedFile = false;
      recursive_directory_iterator it = SetupState(false, SeenNestedFile);
      TEST_REQUIRE(it != endIt);
      TEST_REQUIRE(*it == nestedDir);
      ec = GetTestEC();
      it.increment(ec);
      TEST_CHECK(ec);
      TEST_CHECK(ec == eacess_ec);
      TEST_CHECK(it == endIt);
    }
    {
      bool SeenNestedFile = false;
      recursive_directory_iterator it = SetupState(true, SeenNestedFile);
      TEST_REQUIRE(it != endIt);
      TEST_REQUIRE(*it == nestedDir);
      ec = GetTestEC();
      it.increment(ec);
      TEST_CHECK(!ec);
      if (SeenNestedFile) {
        TEST_CHECK(it == endIt);
      } else {
        TEST_REQUIRE(it != endIt);
        TEST_CHECK(*it == nestedFile);
      }
    }
}