Normalize '.' and '..' in paths

[ennoruijters]

Task Description

S3Path.normalize() currently just returns the path unmodified. This is inconvenient for users wanting to use S3FS as a replacement for more unix-like filesystem, where elements '.' and '..' have special meanings ('this directory', and 'parent directory').

We can make S3FS behave more unix-like by having normalize() effectively remove "./" and "<dir>/../".

Notes

• S3 itself does not attach special meaning to these filenames, so it is perfectly legal to create an object with key "/abc/../file" distinct from "/file". If we add normalization, we would make such objects inaccessible. If this is particularly unwanted, we could make the behaviour configurable.
• Paths.get().normalize() on Windows also treats the .. the same way.

Tasks

The following tasks will need to be carried out:

• Implement S3Path.normalize() that normalizes paths as if they were Unix paths.
• Include unit tests.

Help

• Our chat channel
• Points of contact:
  • @carlspring
  • @ptirador
  • @steve-todorov

[carlspring]

@ennoruijters : Thank you very much for your contribution and apologies for the amount of time it took to get to it!