Ever craved for a tool to monitor what files are growing faster than other ones? Just run it by cron: diskhogs.sh /var/lib/libvirt/images

diskhogs.sh

#!/bin/sh

# Checking the spool directory
SPOOL=/var/spool/diskhogs
if [ ! -e "${SPOOL}" ]; then
        mkdir -p "${SPOOL}"
fi
if [ ! -d "${SPOOL}" ]; then
        echo "There are no ${SPOOL} directory" >&2
        exit 1
fi

if [ -z "${1}" ]; then
        DIR=.
else
        DIR="${1}"
fi

FILES=$(find "${DIR}" -type f)

TIME=$(date +%s)
if [ -z "${TIME}" ]; then
        echo "Can't determine current time" >&2
        exit 1
fi

for FILE in ${FILES}; do

        SIZE=$(ls -nl ${FILE} | awk '{ print $5 }')
        if [ -z "${SIZE}" ]; then
                echo "Can't determine size of the ${FILE} file" >&2
                continue
        fi

        sqlite3 "${SPOOL}/db" "INSERT INTO sizes VALUES ('${FILE}', '${TIME}', '${SIZE}');"
        if [ ${?} -ne 0 ]; then
                continue
        fi

done

for PERIOD in 60 300 600 1800 3600 86400; do

        TIME_WAS=$((${TIME} - ${PERIOD}))

        (
                echo "*** Since $(date --date="@${TIME_WAS}") (${PERIOD} seconds ago) ***"
                sqlite3 \
                        "${SPOOL}/db" \
                        "SELECT MAX(size) - MIN(size) AS mm, name
                                FROM sizes
                                WHERE time >= '${TIME_WAS}'
                                GROUP BY name
                                ORDER BY mm
                        ;"
        ) > "${SPOOL}/report_${PERIOD}"

done