Comment # 3 on bug 960298 from Christian Boltz

Displaying an input box if the service name ends with "@" is a "non-trivial
feature request"? Seriously?



Since I had written a more verbose explanation before you posted your last
comment, let me post it nevertheless - maybe someone can learn something from
it ;-)


To make the problem clear: openvpn@ is a so-called "Instantiated Services"),
which you can't use directly (but YaST tries to):
    # systemctl enable openvpn@.service
    Failed to execute operation: Unit name openvpn@.service is not valid.

It's not surprising that systemctl errors out - you _have to_ specify an
instance name after the "@". This name will typically be used to determinate
the config file name (look for %i in the service file).

This means you have to use something like (note the added "myserver" after the
"@"):
    # systemctl enable openvpn@myserver.service

It's also possible to have more openvpn instances in parallel, like
    # systemctl enable openvpn@myserver.service
    # systemctl enable openvpn@cheapvpnprovider.service
    # systemctl enable openvpn@geeko.service

(all those commands succeed.)


This all means:

*** If the user wants to start or enable "openvpn@", YaST will need to display
*** an input box where users can enter "myserver" or whatever config name they
*** want to use.


In theory this also applies to stop and disable, however this will never happen
in practise because "openvpn@" can never be running or enabled - only something
like "openvpn@myserver" can. (On the positive side, YaST will display
"openvpn@myserver" in the service list as soon as it's running or enabled, so
users can disable or stop it.)



FIY: In the service file, it looks like this:

    # systemctl cat openvpn@.service
    [...]
    ExecStart=/usr/sbin/openvpn --daemon --suppress-timestamps
        --writepid /run/openvpn/%i.pid --cd /etc/openvpn/ 
        --config %i.conf

%i gets replaced by "myserver" for openvpn@myserver.service or by "geeko" for
openvpn@geeko.service.

If you are interested on the systemd documentation about Instantiated Services,
see http://0pointer.de/blog/projects/instances.html



That all said - I opened https://features.opensuse.org/320260