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I am using this script to backup the LDAP daily via cronjob. Is it possible to modify the script to only send a email if there has been an error.

Copy of email sent daily

* Create data directory: /var/backups/ldap/ldap/2011.09/27.
* Backup completed successfully.
    + Data: /var/backups/ldap/ldap/2011.09/27/2011.09.27.04.01.01.ldif*
    + Log: /var/backups/ldap/logs/2011.09/ldap-2011.09.27.04.01.01.log

LDAP Script

#########################################################
# Modify below variables to fit your need ----
#########################################################

# Where to store backup copies.
#BACKUP_ROOTDIR='/backup'
BACKUP_ROOTDIR='/var/backups/ldap'

# Compress plain SQL file: YES, NO.
COMPRESS="YES"

# Delete plain LDIF files after compressed. Compressed copy will be remained.
DELETE_PLAIN_LDIF_FILE="YES"

#########################################################
# You do *NOT* need to modify below lines.
#########################################################

export PATH="$PATH:/usr/sbin:/usr/local/sbin/"

# Commands.
CMD_DATE='/bin/date'
CMD_DU='du -sh'
CMD_COMPRESS='bzip2 -9'

if [ -f /etc/ldap/slapd.conf ]; then
    export CMD_SLAPCAT='slapcat -f /etc/ldap/slapd.conf'
elif [ -f /etc/openldap/slapd.conf ]; then
    export CMD_SLAPCAT='slapcat -f /etc/openldap/slapd.conf'
elif [ -f /usr/local/etc/openldap/slapd.conf ]; then
    export CMD_SLAPCAT='slapcat -f /usr/local/etc/openldap/slapd.conf'
else
    export CMD_SLAPCAT='slapcat'
fi

# Date.
export MONTH="$(${CMD_DATE} +%Y.%m)"
export DAY="$(${CMD_DATE} +%d)"
export DATE="$(${CMD_DATE} +%Y.%m.%d.%H.%M.%S)"

export BACKUP_SUCCESS='NO'

#########
# Define, check, create directories.
#
# Backup directory.
export BACKUP_DIR="${BACKUP_ROOTDIR}/ldap/${MONTH}/${DAY}"
export BACKUP_FILE="${BACKUP_DIR}/${DATE}.ldif"

# Logfile directory. Default is /backup/logs/YYYY.MM/.
export LOG_DIR="${BACKUP_ROOTDIR}/logs/${MONTH}"

# Check and create directories.
if [ ! -d ${BACKUP_DIR} ]; then
    echo "* Create data directory: ${BACKUP_DIR}."
    mkdir -p ${BACKUP_DIR}
fi

if [ ! -d ${LOG_DIR} ]; then
    echo "* Create log directory: ${LOG_DIR}."
    mkdir -p ${LOG_DIR} 2>/dev/null
fi

# Log file. Default is /backup/logs/YYYY.MM/mysql-YYYY.MM.DD.log.
LOGFILE="${LOG_DIR}/ldap-${DATE}.log"

############
# Initialize log file.
#
echo "* Starting backup: ${DATE}." >${LOGFILE}
echo "* Backup directory: ${BACKUP_DIR}." >>${LOGFILE}
echo "* Log file: ${LOGFILE}." >>${LOGFILE}

##############
# Backing up
#

echo "* Dumping LDAP data into file: ${BACKUP_FILE}..." >>${LOGFILE}
${CMD_SLAPCAT} > ${BACKUP_FILE}
if [ X"$?" == X"0" ]; then
    export BACKUP_SUCCESS='YES'
fi

# Compress plain SQL file.
if [ X"${COMPRESS}" == X"YES" ]; then
    echo "* Compressing LDIF file with command: '${CMD_COMPRESS}' ..." >> ${LOGFILE}
    ${CMD_COMPRESS} ${BACKUP_FILE} >>${LOGFILE} 2>&1

    if [ X"$?" == X"0" ]; then
        echo "* [DONE]" >>${LOGFILE}

        # Delete plain LDIF file after compressed.
        if [ X"${DELETE_PLAIN_LDIF_FILE}" == X"YES" -a -f ${BACKUP_FILE} ]; then
            echo -n "* Removing plain LDIF file: ${BACKUP_FILE}..." >>${LOGFILE}
            rm -f ${BACKUP_DIR}/*.ldif >>${LOGFILE} 2>&1
            [ X"$?" == X"0" ] && echo -e "\t[DONE]" >>${LOGFILE}

        fi
    fi
fi


# Append file size of backup files.
echo "* File size:" >>${LOGFILE}
echo "=================" >>${LOGFILE}
${CMD_DU} ${BACKUP_FILE}* >>${LOGFILE}
echo "=================" >>${LOGFILE}

echo "* Backup completed (Successfully: ${BACKUP_SUCCESS})." >>${LOGFILE}

if [ X"${BACKUP_SUCCESS}" == X"YES" ]; then
    cat <<EOF
* Backup completed successfully.
EOF
else
    echo -e "\n* Backup completed with !!!ERRORS!!!.\n" 1>&2
fi

cat << EOF
    + Data: ${BACKUP_FILE}*
    + Log: ${LOGFILE}
EOF
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1 Answer 1

up vote 0 down vote accepted

Cron will only send an email if there was any stderr or stdout output from the job. You're already echoing most of your output to a log file, but those 4 lines aren't being redirected, so you'll always get the cron report.

I'd move this block

cat << EOF
    + Data: ${BACKUP_FILE}*
    + Log: ${LOGFILE}
EOF

into your 'else' condition, so that it only echos during an error state, then remove the two echos that happen before you've defined LOGFILE (or store those two messages up and drop them in the log file after you've defined it.

As long as a successful redirects all output to a log file, then you'll only get the mail if there's an error.

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