Receiving TypeError("Cannot mix str and non-str arguments")

[Steve Fuller]

Ubuntu Release Info:
-----
Description: Ubuntu 20.04.1 LTS
Release: 20.04

Package Version
-----
Package: apt-transport-s3
Version: 2.0.0-1

Expected behavior
------
apt-get update runs successfully when using an S3 bucket as a source

Actual behavior
------
Receive a "TypeError: Cannot mix str and non-str arguments" and apt-get fails

Details
-------
- Our AWS instance is using an iam role for access to an S3 bucket.
- I've verified that I can list the bucket contents
- I've verified that I can copy the file to the instance via 'aws s3 cp'

Running "apt-get update" results in the following error

Traceback (most recent call last):
  File "/usr/lib/apt/methods/s3", line 597, in <module>
    method = S3_method(config)
  File "/usr/lib/apt/methods/s3", line 384, in __init__
    self.iam.get_credentials()
  File "/usr/lib/apt/methods/s3", line 191, in get_credentials
    data = self.__request_json(urllib.parse.urljoin(self.credentials_metadata,
  File "/usr/lib/python3.8/urllib/parse.py", line 512, in urljoin
    base, url, _coerce_result = _coerce_args(base, url)
  File "/usr/lib/python3.8/urllib/parse.py", line 121, in _coerce_args
    raise TypeError("Cannot mix str and non-str arguments")
TypeError: Cannot mix str and non-str arguments
Reading package lists... Done
E: Method s3 has died unexpectedly!
E: Sub-process s3 returned an error code (1)
E: Method /usr/lib/apt/methods/s3 did not start correctly
E: Failed to fetch s3://<bucket_name>/dists/focal/InRelease
E: Some index files failed to download. They have been ignored, or old ones used instead.

We were able to get this to work by adding the following to /usr/lib/apt/methods/s3 at line 190:

     self.iamrole = str(self.iamrole,'utf-8')

X-Working-Bug: Bug #1974150

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ryan Brosz (rbrosz)]

It appears this was fixed in the upstream development branch:
https://github.com/MayaraCloud/apt-transport-s3/commit/ce0064be41e1ff34f1e4e2cedc48a0cf3fb9d9dd

[Sebastian Nagel (wastl-nagel)]

I can confirm that the problem is solved using the fix linked by Ryan Brosz.

However, v2.1.0 (https://github.com/MayaraCloud/apt-transport-s3/releases/tag/v2.1.0) fails with the error described and fixed in https://github.com/MayaraCloud/apt-transport-s3/pull/60

[Sebastian Nagel (wastl-nagel)]

I can confirm that the problem is solved using the fix linked by Ryan Brosz.

However, v2.1.0 (https://github.com/MayaraCloud/apt-transport-s3/releases/tag/v2.1.0) fails with the error described and fixed in https://github.com/MayaraCloud/apt-transport-s3/pull/60.