Werk #15849: Filesystem checks: Avoid crash if device reports negative free space

Component

Checks & agents

Title

Filesystem checks: Avoid crash if device reports negative free space

Date

May 19, 2023

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.3.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0b1	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.2.0	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p29	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p37	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

A negative value for the free space is of course nonsense. However, if a device reported this, Checkmk might have crashed with

ValueError("Cannot render negative timespan")

when attempting to compute the time left until the filesystem is full. Now, we instead report a value of 0 seconds in this case, st. users receive informative notifications about the problem.

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