[BUG] WALinuxAgent uses different distro version based on Python version

[jadeiceman]

Only python 3.9 is available in CBL-Mariner 2.0, so instead of the full version string being detected, only the version ID is being returned. I suspect this is due to platform.linux_distribution() being removed in later versions of python, and the agent using distro.linux_distribution() instead, which doesn't return the full version string.

This is the content of /etc/os-release:

NAME="Common Base Linux Mariner"
VERSION="2.0.20221203"
ID=mariner
VERSION_ID="2.0"
PRETTY_NAME="CBL-Mariner/Linux"
ANSI_COLOR="1;34"
HOME_URL="https://aka.ms/cbl-mariner"
BUG_REPORT_URL="https://aka.ms/cbl-mariner"
SUPPORT_URL="https://aka.ms/cbl-mariner"

Log from Mariner 2.0 (returns only version ID):

2022-12-14T18:23:13.142860Z INFO Daemon Daemon Azure Linux Agent Version:2.3.1.1
2022-12-14T18:23:13.143986Z INFO Daemon Daemon OS: mariner 2.0
2022-12-14T18:23:13.144113Z INFO Daemon Daemon Python: 3.9.14
2022-12-14T18:23:13.144272Z INFO Daemon Daemon Run daemon
2022-12-14T18:23:13.144416Z INFO Daemon Daemon No RDMA handler exists for distro='Common Base Linux Mariner' version='2.0'

I expect 2.0.20221203 to be detected, but instead only 2.0 is detected.

Log from Mariner 1.0 (returns full version string using python 3.7):

2022-12-14T18:24:38.725096Z INFO Daemon Daemon Azure Linux Agent Version:2.2.54.2
2022-12-14T18:24:38.726342Z INFO Daemon Daemon OS: mariner 1.0.20221202
2022-12-14T18:24:38.726490Z INFO Daemon Daemon Python: 3.7.13
2022-12-14T18:24:38.726728Z INFO Daemon Daemon Run daemon
2022-12-14T18:24:38.726890Z INFO Daemon Daemon No RDMA handler exists for distro='CBL-Mariner' version='1.0.20221202'

Repro steps:

1. Install WALinuxAgent on CBL-Mariner 2.0
2. Start waagent service
3. View logs

Distro and WALinuxAgent details:

• Distro and Version: CBL-Mariner 2.0
• WALinuxAgent version:

WALinuxAgent-2.3.1.1 running on mariner 2.0
Python: 3.9.14
Goal state agent: 2.3.1.1

Additional context
It may be better to use distro.distro_release_info() or distro.os_release_attr('version') instead to build osinfo.

Python 3.9.14 (main, Oct 29 2022, 22:18:10)
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import distro
>>> distro.distro_release_info()
{'name': 'CBL-Mariner', 'version_id': '2.0.20221203', 'id': 'mariner'}
>>> distro.os_release_attr('version')
'2.0.20221203'

[nagworld9]

It's been same case for other distros too with distro module. Any specific reason you are expecting full version rather major and minor version not enough?

[jadeiceman]

We are tracking Mariner build versions in the backend to understand how much of the (Mariner) population is on different build versions. Security fixes are published to specific builds, so just the major version does not give us enough information. Without the full version, we can't tell how much of the population is still on older builds of the same major version.

[nagworld9]

For this I wouldn't expect to take dependency on agent log to check the distro version.

[nagworld9]

We fixed it and will roll out soon.