source: npl/phone/custom_scripts/voicemail_quota_script/script-quota.sh

#!/bin/bash
#Rick Meertens

#Usage:
#By default no customers have a quota.
#Only when you put a file (named as the subdirectory of the customer which is containing the voicemails)in the $ASTERISK_QUOTA_CONFIG_DIR. This file must contain 2 values: QUOTA in bytes and $NEVER_DEL_YOUNGER_THAN in days.


##Example of config file
##This is to prevent that all voicemails will be deleted, when 1 file is exceeding the quota.
##Only set this to 0, when the 'General voicemail setting': maxmessage  in voicemail.conf is set to an #value that wouldn't exceed the quota or else this script works to perfect.
#NEVER_DEL_YOUNGER_THAN=7
##Customer gets 100 megabytes voicemail quota.
#QUOTA=100000000

ASTERISK_QUOTA_CONFIG_DIR="/home/system/asterisk/voicemail_quotas";

#Main directory where all the customers voicemail directories are.
SPOOL_DIR="/home/system/asterisk/spool/voicemail";


GetTotalBytesCust()
{
        cust="$@";
        du -b -s "$SPOOL_DIR/$cust/" | cut -f1
}

for config_file in `ls -1 $ASTERISK_QUOTA_CONFIG_DIR/`; do

        #check if customer directory exist.
        if ! [ -r "$ASTERISK_QUOTA_CONFIG_DIR/$config_file" ]; then
                continue;
        fi
        if ! [ -r "$SPOOL_DIR/$config_file" ]; then
                continue;
        fi
        #load settings;
        NEVER_DEL_YOUNGER_THAN=0;
        source $ASTERISK_QUOTA_CONFIG_DIR/$config_file;

        if [ $NEVER_DEL_YOUNGER_THAN -ge 1 ]; then
                find_cmd="find $SPOOL_DIR/$config_file -iname *wav -mtime +$NEVER_DEL_YOUNGER_THAN -printf %T@\t%p\n";
        else
                find_cmd="find $SPOOL_DIR/$config_file ( -iname *wav ) -printf %T@\t%p\n";
        fi              

        while true; do
                #check if voicemailbox is over her quota.
                bytes_used=`GetTotalBytesCust $config_file`;
                if [ $bytes_used -lt $QUOTA ]; then
                        break
                fi

                #find the oldest file 
                del_file=`$find_cmd | sort -n | head -1 | cut -f2 `;

                #nothing to delete?
                if ! [ "$del_file" ]; then
                        break;
                fi
        
                #delete it
                del_path="$del_file"
                echo "deleting $del_path"
                rm "$del_path";
                #delete meta file
                del_path="`echo $del_path | sed 's/.wav$/.txt/g'`";
                echo "deleting $del_path"
                rm "$del_path";
        done
done