ros2 bag info -v fails for individual mcap files

[tonynajjar]

Description

Running ros2 bag info with --verbose on a standalone MCAP file fails, while the same file works without --verbose.

Verbose mode attempts to reopen per-file storage entries and incorrectly resolves the path as sample.mcap/sample.mcap when the bag input is already a file path.

Expected Behavior

ros2 bag info sample.mcap -v should succeed and print verbose bag information for the same MCAP file that works in non-verbose mode.

Actual Behavior

Verbose mode fails with storage open errors.

Example command:

ros2 bag info sample.mcap -v

Example logs:

[ERROR ...] [rosbag2_storage]: Could not open 'sample.mcap/sample.mcap' with 'mcap'. Error: Not a directory
[ERROR ...] [rosbag2_storage]: Could not load/open plugin with storage id: 'mcap'
[INFO  ...] [rosbag2_storage]: Available storage plugins: 'sqlite3', 'mcap', ...
No plugin detected that could open file sample.mcap/sample.mcap

To Reproduce

1. Obtain or record a standalone MCAP file named sample.mcap.
2. Run:

   ros2 bag info sample.mcap

3. Verify non-verbose command succeeds.
4. Run:

   ros2 bag info sample.mcap -v

5. Observe path resolution error with sample.mcap/sample.mcap.

System (please complete the following information)

• OS: Ubuntu 24.04.2 LTS
• ROS 2 Distro: Kilted
• Install Method: source
• Version: kilted
  I believe the issue is also present on rolling