Implement pre-processing script to determine if bag has been uploaded to preservation

[zoidy]

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Description

If the combined data and curation metadata folder does not exist in preservation staging storage, the software will re-download it. To avoid a lot of extra downloading when the record has already been preserved, check to make sure the bag isn't already preserved

Suggested Implementation

In the pre-processing script section

• check to see if a bag with the same name as the package currently being processed exists in preservation storage.
• if it does, skip further processing of the package (i.e., don't download any data files) and delete any files/folders already created
• if it doesn't, continue processing the package (i.e., downloading the files, creating and uploading the bag)