Werk #18200: docker container diskstat: fix parsing of names line

Component

Checks & agents

Title

docker container diskstat: fix parsing of names line

Date

Aug 6, 2025

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p10	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p36	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Parsing of the section docker_container_diskstat_cgroupv2 crashed when the subsection [names] contained a line with only a device name (without a device number), e.g.:

[names]
nvme0c0n1

instead of the expected:

[names]
nvme0n1 259:1

The following error was raised:

self.names[line[1]] = line[0]
               ~~~~^^^
IndexError: list index out of range

This issue has been fixed by skipping such corrupt output lines.

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