Google Cloud fails with UnsupportedBackendScheme

[jGleitz]

23 days ago, my backups to Google Cloud stopped working with the following error:

UnsupportedBackendScheme: scheme not supported in url: gs://...

Because the issue appeared 23 days ago, I assume it must have been caused by one of the 4 commits since then. However, I couldn’t find a cause from the diff. Neither pip install boto nor apk add --no-cache py3-six helped.

One can reproduce the issue by running:

> docker run --rm --user $UID \
      -e PASSPHRASE=P4ssw0rd \
      wernight/duplicity \
      duplicity --full-if-older-than=6M --allow-source-mismatch /data gs://my-bucket-name/some_dir

gpg: WARNING: unsafe ownership on homedir '/home/duplicity/.gnupg'
UnsupportedBackendScheme: scheme not supported in url: gs://my-bucket-name/some_dir

[jGleitz]

duplicity has dropped the gs:// scheme out of the box. To use Google Cloud, follow the instructions in the man page.