mythbackend shutting down during frontend setup

[mathog]

Sometimes in mythfrontend this happens:

select utilities/setup
select setup
select one of the options
take more than one minute
system shuts down


The mythtv-setup shutdown/wakeup options are:

startup command: blank)
[x] Block shutdown before client connected
Idle shutdown timeout (secs): 60
Max. wait for recording (min): 5
Startup before rec. (secs): 180
Wakeup time format: time_t
Command to set Wakeup Time: /usr/local/bin/MythWakeSet $time
Server halt command: /usr/local/bin/MythPowerOff
Pre Shutdown check-command: mythshutdown --check

mythwelcome itself doesn't do anything except start the frontend, all the other commands are set to /bin/true. This is MythPowerOff

#!/bin/bash
MYTIME=`date '+%s'`
logger "MythPowerOff called at $MYTIME"
poweroff

It looks like some of the setup options do not show up as "busy" for "mythshutdown --check" and it shuts down. In theory this should return 255, but maybe that is for setting up the backend and not the front end? The mythtv version is

0.21.0+fixes20277-openglvdpau-0ubuntu3

Anybody else seen this?

[mathog]

Last night it shut down while it was playing a NUV file. VERY annoying.

top menu
media library
watch recording
select recording
watch it


A minute or maybe two later, system shut down. The logs showed it was a shutdown initiated by mythbackend.

So far it has not shut down while watching TV or recording.

[mathog]

I think I see what the problem is. Both of these

mythshutdown -c 1
mythshutdown -s 1

return 0 when the frontend is running, whether or not TV is being watched, recordings are being watched, or whatever. It does return
8 for recording, etc. but just using the frontend does not, apparently qualify as a condition precluding shutdown. So I put this in
/usr/local/bin/MythCheckShutdown

#!/bin/bash
#
# safer check for mythbackend initiated system shutdown.
# This may be used in the "Pre Shutdown check-command" in mythtv-setup
# "general", under "Shutdown/Wakeup Options"
#
# Returns 0 if shutdown is allowed
# Returns 1 if shutdown is not allowed
#
# mythshutdown status must be 0, anything else means the backend is
# busy.
#
mythshutdown --check
MYTHSTATUS=$?
if [ $MYTHSTATUS -eq 0 ]
then
#
# the frontend must also have exited, or not started in the first place
# If that is the case the next.
#
FRONTSTATUS=`ps -ef | grep mythfrontend.real | grep /usr/bin | wc -l`
if [ $FRONTSTATUS -ne 0 ]
then
MYTHSTATUS=1
fi
else
MYTHSTATUS=1
fi
exit $MYTHSTATUS


And changed

Pre Shutdown check-command: mythshutdown --check

to

Pre Shutdown check-command: MythCheckShutdown

So far it has blocked further unwanted shutdowns.