[mythtv-users] local-network-pingable.service

[Jim Abernathy]

I'm trying to clean up any race conditions that may exist in my 
production backend since I have both HDHomeRun network tuners and PCIe 
cards.

Stephen came up with a very useful guide to adding a 
local-network-pingable.service that makes sure your HDHR network tuners 
are online before mythbackend is started. 
(https://lists.archive.carbon60.com/mythtv/users/625986#625986)

I'm examining it to try to understand it better which points to my lack 
of understanding of systemd. I'm trying to understand why in the 
following service file the command is in the "ExecStartPre" instead of 
"ExecStart":

local-network-pingable.service

-----------------------------------------------

[Unit]
Description=Wait for the local network to be pingable
After=network.target

[Service]
Type=simple
ExecStartPre=/bin/bash -c "/usr/local/bin/wait-until-pingable.py 
192.168.0.180 60"
ExecStart=/bin/true

[Install]
WantedBy=multi-user.target