Werk #6938: cmk-update-agent: Handle failing package manager

Component Agent bakery
Title cmk-update-agent: Handle failing package manager
Date Jan 18, 2019
Checkmk Edition Checkmk Enterprise (CEE)
Checkmk Version 1.5.0p12 1.6.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

This werk fixes two bugs that occur on Unix and Linux when the invoked package manager fails to install an agent package:

The agent updater saved the agent hash to its state file immediately before the update takes place. As a result, an agent package got recognized as installed even if its installation failed.

(Regression since Check_MK 1.5) Due to inproper handling of the stderr and stdout streams coming from the invoked package manager, the agent updater crashed on a package manager failure instead of forwarding the error messages to the user or log.

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