[mythtvnz] New install - mythbackend password not accepted

[Stephen Worthington]

On Sat, 3 Jul 2021 14:34:57 +1200, you wrote:

>Hi Stephen et al
>
>I'm back setting up the new 20.04 MythTV system.
>
>Can you point me to the best guides to set up systemd to wait for HDHR 
>and for Haupauge tuners to load before starting Mythbackend?
>
>There is a lot of information out there (in the list) but I don't know 
>which is the most concise.
>
>Thanks
>
>Paul

Presuming that the Hauppauge tuners are normal DVB ones, then to wait
for them you need to install this file:

root at mypvr:/etc/udev/rules.d# cat 99-tuner.rules
#
# Create systemd device units for capture devices
#
SUBSYSTEM=="video4linux", TAG+="systemd"
SUBSYSTEM=="dvb", TAG+="systemd"
SUBSYSTEM=="firewire", TAG+="systemd"

It should be chown root:root and chmod u=rw,og=r.

What that does is get udev to create a systemd unit for each tuner
when the tuner becomes available.  Then you do:

sudo systemctl edit mythtv-backend

and add lines like these, one pair for each tuner, in the [Unit]
section:

[Unit]
Wants=dev-dvb-adapter0-frontend0.device
After=dev-dvb-adapter0-frontend0.device
Wants=dev-dvb-adapter1-frontend0.device
After=dev-dvb-adapter1-frontend0.device

Details of my fix to make mythbackend wait for network tuners to be
available are on this thread:

https://lists.archive.carbon60.com/mythtv/users/625992