Plex_DRI_Check

#!/bin/sh

# Update 4182020: Changed all console outputs to instead write to a logfile. The logfile will
# always be in the scripts directory, regardless of where script is executed from.

# This is a script that checks for the /dev/dri device existing inside the Plex jail.
# If it does not exist, it kills the jail, restarts devfs service, and restarts the jail.
# If there are open streams, the script waits 5 minutes and checks again. After checking 12 times,
# the script will exit. When there are 0 streams open, the script continues with
# the check.

# To email and wipe the logfile, use this as a cron task:
# mail -s "Plex DRI Check Log" EmailAddress@here.com < /path/to/log/plex_dri_check.log; echo "" > /path/to/log/plex_dri_check.log

# Specify Plex jail name, IP, port, auth token, and custom ruleset number:
PlexName="plex"
PlexIP="192.168.1.100"
PlexPort="32400"
Token="replace_this_with_token"
RuleNum="110"

TimeStamp()
{
        date +"%Y-%m-%d %T:"
}

TimeStampPre() {
    while IFS= read -r line; do
        printf '%s %s\n' "$(date +"%Y-%m-%d %T:")" "$line";
    done
}

LogFile="${0%/*}/plex_dri_check.log"
RetryCount=0
StreamCount=$(curl "http://$PlexIP:$PlexPort/status/sessions?X-Plex-Token=$Token" --stderr - \
        | grep 'MediaContainer size=' | grep -o '[0-9]\+')

while [ $StreamCount -gt 0 ]
do
        echo "$(TimeStamp) There are currently $StreamCount open stream(s). Sleeping for 5m, then checking again." >> "$LogFile"
        RetryCount=$((RetryCount+1))
        if [ $RetryCount = "12" ]
        then
                echo "$(TimeStamp) Checked $RetryCount times. Stream(s) still open. Exiting." >> "$LogFile"
                exit 0
        fi
        sleep 300
        StreamCount=$(curl "http://$PlexIP:$PlexPort/status/sessions?X-Plex-Token=$Token" --stderr - \
        | grep 'MediaContainer size=' | grep -o '[0-9]\+')
done

if iocage exec $PlexName ls /dev/ | grep -c "dri" > /dev/null
then
        echo "$(TimeStamp) DRI pass-through still exists. Exiting." >> "$LogFile"
else
        echo "$(TimeStamp) DRI pass-through no longer exists. Killing Plex, restarting devfs, restarting Plex." >> "$LogFile"
        iocage stop $PlexName | TimeStampPre >> "$LogFile"
        sleep 3
        service devfs restart | TimeStampPre >> "$LogFile"
        sleep 3
        iocage start $PlexName | TimeStampPre >> "$LogFile"
        if iocage get all $PlexName | grep -c "ruleset:$RuleNum" > /dev/null
        then
                echo "$(TimeStamp) devfs_ruleset:$RuleNum successfully loaded." >> "$LogFile"
        else
                echo "$(TimeStamp) CRITICAL: devfs_ruleset:$RuleNum failed to load!" >> "$LogFile"
        fi
fi