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