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

Component	Agent bakery
Title	cmk-update-agent: Handle failing package manager
Date	Jan 18, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p12 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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