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Option to use ssmtp to send mail #13

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Option to use ssmtp to send mail #13

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47441a3
Add mail construction option to use ssmtp in addition to mailx
shamer Mar 14, 2012
82aa644
add lock file to prevent running multiple instances simultaneously
shamer Apr 2, 2012
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58 changes: 47 additions & 11 deletions dt-s3-backup.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,14 @@ EMAIL_TO=
EMAIL_FROM=
EMAIL_SUBJECT=

# command to use to send mail
MAIL="mailx"
#MAIL="ssmtp"

# File to use as a lock. The lock is used to insure that only one instance of
# the script is running at a time.
LOCKFILE=${LOGDIR}backup.lock

# TROUBLESHOOTING: If you are having any problems running this script it is
# helpful to see the command output that is being generated to determine if the
# script is causing a problem or if it is an issue with duplicity (or your
Expand All @@ -129,7 +137,6 @@ EMAIL_SUBJECT=
LOGFILE="${LOGDIR}${LOG_FILE}"
DUPLICITY="$(which duplicity)"
S3CMD="$(which s3cmd)"
MAIL="$(which mailx)"

NO_S3CMD="WARNING: s3cmd is not installed, remote file \
size information unavailable."
Expand Down Expand Up @@ -167,6 +174,42 @@ elif [ ! -w ${LOGDIR} ]; then
exit 1
fi

email_logfile()
{
if [ $EMAIL_TO ]; then
MAILCMD=$(which $MAIL)
if [ ! -x "$MAILCMD" ]; then
echo -e "Email couldn't be sent. ${MAIL} not available." >> ${LOGFILE}
else
EMAIL_SUBJECT=${EMAIL_SUBJECT:="DT-S3 Alert ${LOG_FILE}"}
if [ "$MAIL" = "ssmtp" ]; then
echo """Subject: ${EMAIL_SUBJECT}""" | cat - ${LOGFILE} | ${MAILCMD} -s ${EMAIL_TO}

elif ["$MAIL" = "mailx" ]; then
EMAIL_FROM=${EMAIL_FROM:+"-r ${EMAIL_FROM}"}
cat ${LOGFILE} | ${MAILCMD} -s """${EMAIL_SUBJECT}""" $EMAIL_FROM ${EMAIL_TO}
fi
echo -e "Email alert sent to ${EMAIL_TO} using ${MAIL}" >> ${LOGFILE}
fi
fi
}

get_lock()
{
echo "Attempting to acquire lock ${LOCKFILE}" >> ${LOGFILE}
if ( set -o noclobber; echo "$$" > "${LOCKFILE}" ) 2> /dev/null; then
# The lock succeeded. Create a signal handler to remove the lock file when the process terminates.
trap 'EXITCODE=$?; echo "Removing lock. Exit code: ${EXITCODE}" >>${LOGFILE}; rm -f "${LOCKFILE}"' 0
echo "successfully acquired lock." >> ${LOGFILE}
else
# Write lock acquisition errors to log file and stderr
echo "lock failed, could not acquire ${LOCKFILE}" | tee -a ${LOGFILE} >&2
echo "lock held by $(cat ${LOCKFILE})" | tee -a ${LOGFILE} >&2
email_logfile
exit 2
fi
}

get_source_file_size()
{
echo "---------[ Source File Size Information ]---------" >> ${LOGFILE}
Expand Down Expand Up @@ -299,6 +342,8 @@ check_variables ()

echo -e "-------- START DT-S3-BACKUP SCRIPT --------\n" >> ${LOGFILE}

get_lock

if [ "$1" = "--backup-script" ]; then
backup_this_script
exit
Expand Down Expand Up @@ -435,16 +480,7 @@ fi

echo -e "-------- END DT-S3-BACKUP SCRIPT --------\n" >> ${LOGFILE}

if [ $EMAIL_TO ]; then
if [ ! -x "$MAIL" ]; then
echo -e "Email couldn't be sent. mailx not available." >> ${LOGFILE}
else
EMAIL_FROM=${EMAIL_FROM:+"-r ${EMAIL_FROM}"}
EMAIL_SUBJECT=${EMAIL_SUBJECT:="DT-S3 Alert ${LOG_FILE}"}
cat ${LOGFILE} | ${MAIL} -s """${EMAIL_SUBJECT}""" $EMAIL_FROM ${EMAIL_TO}
echo -e "Email alert sent to ${EMAIL_TO} using ${MAIL}" >> ${LOGFILE}
fi
fi
email_logfile

if [ ${ECHO} ]; then
echo "TEST RUN ONLY: Check the logfile for command output."
Expand Down