file_bundle_utils assumes paths are relative to the running process CWD

[ssteinbach]

The file bundle adapters convert relative paths in the OTIO files here:

OpenTimelineIO/src/py-opentimelineio/opentimelineio/adapters/file_bundle_utils.py

Line 132 in 5dff8be

target_file = os.path.abspath(url_utils.filepath_from_url(target_url))

This uses the process CWD as the root directory. It might make more sense to make paths relative to the .otio file location. Alternatively, we could disallow relative paths in file bundles entirely.

[jminor]

I agree that using the CWD is not a good idea.

If we allow the paths to be relative to the .otio file, then converting between OTIOZ and OTIOD will allow the content.otio to be identical. If we disallow relative paths, then that conversion will require re-writing the paths.

[ssteinbach]

I think the right way to fix this, given that this is the only thing in OTIO that cares about this, is to add an argument to the adapter that allows you to specify the relative path policy:

• disallow
• relative to CWD of process
• relative to root otio file

If we wanted to preserve the current behavior we could leave the default at "relative to CWD of process" otherwise we could set it to relative to root otio file.