how to use a systemd service, without making it persistent ?

[sean darcy <seandarcy2@xxxxxxxxx>]

I want to start a systemd service (dhcpd) , but only if a link to the 
internet is present. I don't want the service to start on boot.

systemctl start <service>  doesn't work unless the service is enabled.

This works, but it's very kludgy:

if <link to internet>
 systemctl enable <service>
 systemctl start <service>
 systemctl disable <service>
fi

Any better ideas ?

sean
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