V1.4 Mailversand wenn Homebridge nicht läuft oder Fehler im Log

vim scripts/check_homebridge.sh

#!/bin/bash
###################################################################
# Version 1.3                                                     #
# Written by Daniel Kaiser                                        #
# Date 26.10.2017                                                 #
# Based on sendEmail - http://www.gtkdb.de/index_36_2296.html     #
# Changelog: 26.10.2017 - 1.2: Added Configpart                   #
#                              Added Logrotation                  #
#                              Mail now contains error            #
#                         1.3: Logfile wurde nicht geschrieben    #
#                         1.4: Logrotation ausgebaut              #
###################################################################
# Add your Search-String to Variable search - Multiple Strings separated by '\|'
search='Error\|Warning'

# Add your Homebridge-Logpath to Variable log
log=/var/log/homebridge.log

# The logpath-Variable is the log for this script
logpath=/var/log/check_homebridge.log

# The cntfile-Variable contains the counter for hits - to prevent multiple Mails without any new hits
cntfile=/home/pi/scripts/last_cnt.log

# If your Homebridge is running as a Service change this variable to 1 else 0
HBisService=1

# If your Service is not named as "Homebridge" change here
SERVICE=homebridge

# Error in Log - Mailheader
errHeader="Error in Homebridge-Log"

# Homebridge not running - Mailheader
HBHeader="$SERVICE service is not running!"

# Define Logfile-Size
#MaxFileSize=2048

##############################################
# No changes need to be done after this line #
##############################################

# Count $search Hits in $log
num_errors="$( grep -ic $search $log )"

# If Countfile not exist, create with "-1"
if [ ! -s $cntfile ]; then
    echo -1 > $cntfile
fi

# If Hits greater 0 enter sendMail-Process
if [ $num_errors != 0 ]; then
    cnt=$( cat $cntfile )
    # Count new Hits since last run
    diff=`expr $num_errors - $cnt `
    # If hits differ since last run - send Mail
    if [ $num_errors != $cnt ]; then
        /usr/local/bin/mailnotify.sh "$errHeader" "$( grep -i $search $log | tail -n $diff )" >> $logpath
        echo $num_errors > $cntfile
    else
        echo "$( date ): No new errors in $log" >> $logpath
    fi
fi

# If HBisService is set to 1 enter process to check if Homebridge is running
comp=1
if [ "$HBisService" -eq "$comp" ]; then
    # List Processes | ignore grep | grep for Service
    if systemctl status $SERVICE | grep running > /dev/null
    then
        echo "$( date ): $SERVICE service running, everything is fine" >> $logpath
    # If no process found, send Mail
    else
        /usr/local/bin/mailnotify.sh "$HBHeader" "$( grep $log | tail -n 30 )" >> $logpath
    fi
fi

###### Logrotation can be done using logrotate.d
################################
#      Logfilerotation         #
################################

# Get size in bytes**
#file_size=`du -b $logpath | tr -s '\t' ' ' | cut -d' ' -f1`
# If file-size greater than maxfile size enter process
#if [ $file_size -gt $MaxFileSize ];then
#    timestamp=`date +%s`
#    echo "Logfile moved to $logpath.$timestamp for Logrotation" >> $logpath
#    # Move Logfile
#    mv $logpath $logpath.$timestamp
#    # Create empty logfile
#    touch $logpath
#fi

sudo vim /etc/logrotate.d/check_homebridge

/home/pi/scripts/check_homebridge.log
{
        rotate 7
        daily
        missingok
        notifempty
        delaycompress
        compress
        postrotate
                invoke-rc.d rsyslog rotate > /dev/null
        endscript
}