Github user rhtyd commented on the issue:
https://github.com/apache/cloudstack/pull/1647
@wido @vincentbernat I could not get rid of the postinst step as shell is
not executed when I move the code in the EnvironmentFile itself. I've reduced
its impact to only run when the default /etc/default/cloudstack-{usage, agent}
are installed.
Since we're re-using the common systemd files, the JAVA_HOME declared in
the files are set to the default we see on CentOS and only in that case the
postinst step will replace it with the system default. On future upgrades, the
postinst code won't run. Sorry, but this hack was needed.
Please see one last time, if we're in agreement as soon as my packaging
testing succeed I'll merge this. /cc @jburwell @karuturi
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