ERROR: Unknown format code 'b' for object of type 'str' on ubuntu 22.04

[boukendesho]

• YubiKey Manager (ykman) version: 5.5.0
• How was it installed?: PPA
• Operating system and version: Ubuntu 22.04.4 LTS
• YubiKey model and version: YubiKey 5C NFC
• Bug description summary:

Only happen on ubuntu 22.04 and ok on ubuntu 24.04

Steps to reproduce

run $ ykman info

Expected result

show correct info.

Actual results and logs

$ ykman info
Device type: YubiKey 5 NFC
Serial number: xxxxxxxx
Firmware version: 5.2.4
Form factor: Keychain (USB-A)
Enabled USB interfaces: OTP, FIDO, CCID
NFC transport is enabled

ERROR: Unknown format code 'b' for object of type 'str'

Other info

[pedrohdz]

I am experiencing the same after a pip install yubikey-manager on MacOS 14.5.

python3.12 --version:

Python 3.12.4

pip freeze:

cffi==1.16.0
click==8.1.7
cryptography==42.0.8
fido2==1.1.3
jaraco.classes==3.4.0
jaraco.context==5.3.0
jaraco.functools==4.0.1
keyring==25.2.1
more-itertools==10.3.0
pycparser==2.22
pyscard==2.0.10
wheel==0.43.0
yubikey-manager==5.5.0

Let me know if there is any other information that I can post that would be helpful.

Thanks!

[dainnilsson]

Issue confirmed. There is a compatibility with older versions of Python. A workaround is to install a newer Python version. @pedrohdz - This should not be an issue on Python 3.12. Can you provide the output of ykman --diagnose?

[pedrohdz]

@dainnilsson Is any of the information personally identifiable?

[dainnilsson]

The serial number of your YubiKey will be contained, along with the type of YubiKey and some configuration. Mainly I'm curious about the initial lines showing OS and Python version information, so it's enough to just provide that part!

[pedrohdz]

@dainnilsson Here you go. Let me know if there is something missing:

ykman:            5.5.0
Python:           3.12.4 (main, Jun  8 2024, 04:51:36) [Clang 15.0.0 (clang-1500.1.0.2.5)]
Platform:         darwin
Arch:             arm64
System date:      2024-07-01
Running as admin: False
Detected PC/SC readers:
  Yubico YubiKey OTP+FIDO+CCID: Success

[dainnilsson]

@pedrohdz I'm surprized to see ykman using Python 3.12 there, as that shouldn't produce the formatting issue. Are you certain that this is the same installation of ykman that was producing the issue? Do you have other versions of Python installed?

Anyway, we will be releasing a new version shortly to deal with this.

[pedrohdz]

@dainnilsson I might have mixed-up versions. It was on py3.9 at first, that gave the error for sure. I recreated the venv with py3.12, I thought I saw the error there. The error is gone now. I was forced to restart my terminal and lost my scroll history.

Either way, issue resolved!

Thank you for addressing this so promptly!

[dainnilsson]

Good, glad to have confirmation that it is not an issue under Python 3.12.

So, to anyone else in the thread: We will release a fixed 5.5.1 soon, but in the meantime updating Python to 3.12 solves the issue.

[dainnilsson]

5.5.1 is now released with a fix for this, it should work on older Python versions without throwing the error.