Weird pre-shutdown check script behavior

[nomexous]

I wrote an pre-shutdown check script so I could use it in a manner similar to the "shutdown" command. When I want to shutdown my Mythbox for the night, I simply SSH into it and issue "sudo autoshutdown enable". Then I can go to bed, and MythTV will finish what it needs to do, and shutdown.

The command "sudo autoshutdown enable" writes a file named .allow_auto_shutdown to mythtv's home directory. The pre-shutdown check script has mythtv running "autoshutdown status", which checks for the existence of the .allow_auto_shutdown file, and decides whether or not to exit 1 or exit 0.

The problem is that MythTV doesn't consistently honor the script. For example, when my Mythbox is started up, despite the fact that there is no .allow_auto_shutdown file in /home/mythtv, it goes ahead and does a shutdown after the idle period. But if I stop the backend daemon (sudo /etc/init.d/mythtv-backend stop) and restart it, MythTV will honor the script.

I can't figure out what I might have done wrong. I'm pretty sure it's not my script, because it runs just fine. If anyone has any idea what might be causing this odd behavior, let me know.

Pre-shutdown check script:

/usr/bin/autoshutdown
#!/bin/bash

FILE=/home/mythtv/.allow_auto_shutdown

case $1 in

enable|yes|allow|on)
if [ $USER == "mythtv" ]; then
touch $FILE;
elif [ $USER == "root" ]; then
touch $FILE;
echo
echo "Autoshutdown enabled."
echo
else
echo "You must be root to do this."
fi
;;

disable|no|disallow|off)
if [ $USER == "mythtv" ]; then
if [ -f $FILE ]; then
rm $FILE
fi
elif [ $USER == "root" ]; then
if [ -f $FILE ]; then
rm $FILE
fi
echo
echo "Autoshutdown disabled."
echo
else
echo "You must be root to do this."
fi
;;

status)
if [ $USER == "mythtv" ]; then
if [ -f $FILE ]; then
rm $FILE
exit 0
else
exit 1
fi
else
if [ -f $FILE ]; then
echo
echo "Autoshutdown: ENABLED"
echo
else
echo
echo "Autoshutdown: DISABLED"
echo
fi
fi
;;

*)
echo "Usage: $0 [enable|yes|allow|on|disable|no|disallow|off|status]"
;;
esac

[nomexous]

Never mind, found what was wrong.

Turns out that when the mythtv-backend daemon was calling the pre-shutdown check script, the Bash environment variables weren't being set. When I started the daemon up manually, however, they were, accounting for the inconsistent behavior I mentioned before. So I just put a check in the script to see if $USER is unset. If it is unset, assume it's "mythtv".

Fixed /usr/bin/autoshutdown:
#!/bin/bash

FILE=/home/mythtv/.allow_auto_shutdown

# The fix.
USER=${USER:='mythtv'}

case $1 in

enable|yes|allow|on)
if [ $USER == "mythtv" ]; then
touch $FILE;
elif [ $USER == "root" ]; then
touch $FILE;
echo
echo "Autoshutdown enabled."
echo
else
echo "You must be root to do this."
fi
;;

disable|no|disallow|off)
if [ $USER == "mythtv" ]; then
if [ -f $FILE ]; then
rm $FILE
fi
elif [ $USER == "root" ]; then
if [ -f $FILE ]; then
rm $FILE
fi
echo
echo "Autoshutdown disabled."
echo
else
echo "You must be root to do this."
fi
;;

status)
if [ $USER == "mythtv" ]; then
if [ -f $FILE ]; then
rm $FILE
exit 0
else
exit 1
fi
else
if [ -f $FILE ]; then
echo
echo "Autoshutdown: ENABLED"
echo
else
echo
echo "Autoshutdown: DISABLED"
echo
fi
fi
;;

*)
echo "Usage: $0 [enable|yes|allow|on|disable|no|disallow|off|status]"
;;
esac
Thanks for all your help........ guys.:lolflag: