Set a default ExecStart in rguard.service that blocks shutdown

[ryran]

The rguard.service file should do something out of the box instead of requiring you to configure it.

I think the most intuitive thing would be for it to block shutdown as long as the service is running, e.g., via --run false.

[ryran]

$ head rguard.service
[Unit]
Description=Reboot Guard

[Service]
# With the following default example, shutdown will ALWAYS be blocked
# This is because the "false" command will never succeed
# In this case, shutdown can only be unblocked by manually stopping/killing rguard.service
ExecStart=/usr/sbin/rguard --run false --interval 86400
#
# NOTE: The following ExecStart lines are EXAMPLES only; modify to suit your needs