Re: Proper way to keep service enabled when updated from sysv to systemd?

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On Tue, Aug 13, 2019 at 06:02:42PM +0800, Robin Lee wrote:
> Hi,
> 
> I packaged xe-guest-utilities with a systemd service for Fedora.
> 
> But there is an upstream rpm package that include the same service as
> a sysv one. And the
> service is enabled with the 'Default-Start' info in the init script
> after '/sbin/chkconfig --del xe-linux-distribution'.
> 
> And when people update the package from upstream one to the Fedora
> one. Since the service changed to a systemd one. The service is then
> disabled by default without regard to the sysv service.
> 
> That surprises end users. So the new package should make it compatible
> in the scriptlets.
> But which is the proper way?

You can add a %trigger script. Something like this, completely untested:
%triggerun xe-linux-distribution < …old…version+1…
if test -e /etc/rc.d/rc3.d/Snn-…; then
   # enable systemd service based on old status
   systemctl enable xe-linux-distribution.service
fi

Please note that for new packages, the general guidelines apply
(https://docs.fedoraproject.org/en-US/packaging-guidelines/DefaultServices/)
and services should be managed through presets. But keeping enablement
state on upgrade is outside of the guidelines and a nice thing to do.

Zbyszek
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