systemctl disable output is masked and failure is not handled

[jsoref]

I just tried to remove wazuh from a system and the apt/dpkg process failed miserably.

It took too much effort to debug, the error was from this line:

wazuh-packages/debs/SPECS/wazuh-manager/debian/preinst

Line 69 in daeeaa5

systemctl disable wazuh-api.service > /dev/null 2>&1

At the very least, if the output and error are going to be ignored, the error code should as well.

For debugging, I changed the code...

-systemctl disable wazuh-api.service > /dev/null 2>&1 
+systemctl disable wazuh-api.service || echo echo disable failed -- oh well

Here's the run w/ that change (under sh -x):

+ systemctl disable wazuh-agent
Synchronizing state of wazuh-agent.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install disable wazuh-agent
Failed to disable unit: Too many levels of symbolic links
+ echo disable failed -- oh well
disable failed -- oh well

[DFolchA]

Hello @jsoref

Thank you for reporting this, could you tell us which version of Wazuh were you using?

That command should only be executed during an upgrade when the old version is 3.x, so it should not apply during an uninstall.

[jsoref]

It's kinda irrelevant. Your code is broken and in certain cases apt will use the latest version.

I'm not sure offhand, I turned off the computer.