B2 Duplicity Debian

PUBLISHED ON 18/06/2018 — EDITED ON 11/12/2023 — SYSOPS


On friday all hosts that had B2 as a endpoint for Duplicity failed with error “Authtoken expired, will reauthenticate with next attempt”.

I still have no idea what has changed, but lets fix it.

In this article we will upgrade Duplicity and install B2 via pip (package), as from version 0.15 of Duplicity that is necessary.

Debian 9 (Stretch)

You are in luck, just need to grab the latest Duplicity version from backports. Enable backports by the usual instructions. Be careful if you have some repositories pinned.

apt-get -t stretch-backports install duplicity

B2 from pip

The B2 access has changed in version 0.15, so you need to install the B2 libraries via pip.

pip install b2

Manual B2 install

Problem with the pip way is that it pulls a lot of packages that we don’t necessarily want on the production server. We can avoid that by installing the B2 Python stuff by hand.

If you don’t want pip, do:

tar xvfz b2-1.1.0.tar.gz
cd b2-1.1.0
python install 

If you are missing the module named setuptools, or get this error:

raise BadDateFormat(server_date_str)
BadDateFormat: Date from server: Tue, 19 Jun 2018 08:44:46 GMT

Install/upgrade the package:

apt-get install python-setuptools

Debian 8 (Jessie)

Debian Jessie users have a little less luck, as the latest Duplicity version, even in backports is very old.

To solve this issue we can blatantly steal Ubuntu packages and incorporate them in our system.

Create the file:

vim /etc/apt/sources.list.d/duplicity.list

And add the following content

deb trusty main
deb-src trusty main

Update the repository cache:

apt-get update

Check what will be done:

apt-get --recon install duplicity

Update Duplicity:

apt-get install duplicity

Ignore the trust issues and proceed with install.

And install B2 as before.

Debian 7 (Wheezy)

You should really upgrade the server… Better hit yourself in the knee… But if you insist…

Upgrade Duplicity

Install latest duplicity from source, obtain the latest file:

tar xvfz duplicity-0.7.17.tar.gz
cd duplicity-0.7.17
python install

As this was a machine where Duplicity was already present there were no drama. Maybe if you are doing a clean install, some dependencies will come to surface, but unfortunatly they are outside of the scope of this mini writeup.

Manual B2 install

Enter the hole of fixing B2 dependencies by hand.

You need to install:

  1. futures
  2. tqdm
  3. six
  4. requests
  5. certifi
  6. urllib3
  7. idna
  8. chardet
  9. logfury
  10. funcsigs
  11. arrow
  12. setuptools_scm
  13. backports.functools_lru_cache

Last two packages were tricky, if you get stuck and get:

BackendException: B2 backend requires B2 Python APIs (pip install b2)

You can partially debug the thing by trying to import B2 stuff into a Python interpreter:

$ python
Python 2.7.3 (default, Jun 21 2016, 18:38:19)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import b2
>>> import b2.api

If you get errors, go and fetch the missing packages…

Manual B2 install

wget the latest version, untar, python install

And finally install the B2 as for Jessie.

Possible hiccups

apt-get install -y python-setuptools
apt-get install python-backports.functools-lru-cache

Inappropriate ioctl for device errors

Add this:

echo "use-agent" >> ~/.gnupg/gpg.conf
echo "pinentry-mode loopback" >> ~/.gnupg/gpg.conf
echo "allow-loopback-pinentry" >> ~/.gnupg/gpg-agent.conf

See Also