Should REMOVE return a failure status if the file didn't exist in the first place?

[slifty]

This is potentially an existential question, but I realize I made a decision in implementation long ago that warrants at least some discussion.

The SFTP v2 specification describes REMOVE functionality but does not explain the circumstances under which a response should return SUCCESS vs FAILURE.

As currently implemented we return a FAILURE if a file does not exist, but this is potentially strange since that means the final state is actually the intended state from a user operation perspective.

For rclone this failure means the program goes on to attempt (and of course fail) to remove the path as a directory.

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This is not necessarily an incorrect implementation! I just wanted to raise it.