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Re: [Duplicity-talk] Fwd: AssertionError on every attempt

From: Tim Fletcher
Subject: Re: [Duplicity-talk] Fwd: AssertionError on every attempt
Date: Wed, 10 Jun 2015 15:16:01 +0100
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On 2015-06-09 09:46, Rupert Levene wrote:
I also get duplicate files (same filename, same parent folder) in
Google Drive when using duplicity and have to remove them manually
before retrying. On large backups (thousands of volumes) this happens
quite often.

I think what is happening is that during a backup, duplicity checks
the size of a file on Google Drive after each upload, and sometimes
this call returns -1. (The original upload often appears to have
completed successfully on later inspection, so I think this is some
sort of lag issue in Google Drive). Duplicity thinks the upload didn't
work, so it re-uploads the file. On Google Drive, uploading a file
with the same name and parent folder doesn't overwrite the original
file, it creates a duplicate.

Maybe this could be fixed by asking the server to delete the original
upload (since duplicity believes it to be faulty) before reuploading?

I suspect that this is due to the Google storage back-end having difference constancy guarantees for single objects vs directory listings.

See https://cloud.google.com/storage/docs/concepts-techniques#consistency

Tim Fletcher

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