Add user provided split size to error

rosbag2_compression/src/rosbag2_compression/sequential_compression_writer.cpp

@@ -123,7 +123,8 @@ void SequentialCompressionWriter::open(
   {
     std::stringstream error;
     error << "Invalid bag splitting size given. Please provide a value greater than " <<
-      storage_->get_minimum_split_file_size();
+      storage_->get_minimum_split_file_size() << ". Specified value of " <<
+      storage_options.max_bagfile_size;
     throw std::runtime_error{error.str()};
   }
 

rosbag2_compression/test/rosbag2_compression/test_sequential_compression_writer.cpp

@@ -77,6 +77,29 @@ TEST_F(SequentialCompressionWriterTest, open_throws_on_bad_compression_format)
     std::invalid_argument);
 }
 
+TEST_F(SequentialCompressionWriterTest, open_throws_on_invalid_splitting_size)
+{
+  rosbag2_compression::CompressionOptions compression_options{
+    "zstd", rosbag2_compression::CompressionMode::FILE};
+  auto compression_factory = std::make_unique<rosbag2_compression::CompressionFactory>();
+  auto storage_options = rosbag2_cpp::StorageOptions{};
+  // 0 indicates that bagfile splitting will not be used so use 1 byte which is the
+  // smallest invalid size possible.
+  storage_options.max_bagfile_size = 1;  
+
+  auto sequential_writer = std::make_unique<rosbag2_compression::SequentialCompressionWriter>(
+    compression_options,
+    std::move(compression_factory),
+    std::move(storage_factory_),
+    converter_factory_,
+    std::move(metadata_io_));
+  writer_ = std::make_unique<rosbag2_cpp::Writer>(std::move(sequential_writer));
+
+  EXPECT_THROW(
+    writer_->open(storage_options, {serialization_format_, serialization_format_}),
+    std::runtime_error);
+}
+
 TEST_F(SequentialCompressionWriterTest, open_succeeds_on_supported_compression_format)
 {
   rosbag2_compression::CompressionOptions compression_options{

rosbag2_cpp/src/rosbag2_cpp/writers/sequential_writer.cpp

@@ -107,7 +107,8 @@ void SequentialWriter::open(
   {
     std::stringstream error;
     error << "Invalid bag splitting size given. Please provide a value greater than " <<
-      storage_->get_minimum_split_file_size();
+      storage_->get_minimum_split_file_size() << ". Specified value of " <<
+      storage_options.max_bagfile_size;
     throw std::runtime_error{error.str()};
   }
 

rosbag2_cpp/test/rosbag2_cpp/test_sequential_writer.cpp

@@ -158,7 +158,7 @@ TEST_F(SequentialWriterTest, open_throws_error_on_invalid_splitting_size) {
 
   std::string rmw_format = "rmw_format";
 
-  EXPECT_ANY_THROW(writer_->open(storage_options_, {rmw_format, rmw_format}));
+  EXPECT_THROW(writer_->open(storage_options_, {rmw_format, rmw_format}), std::runtime_error);
 }
 
 TEST_F(SequentialWriterTest, bagfile_size_is_checked_on_every_write) {