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#!/bin/sh
#
# Send email to ZED_EMAIL in response to a DATA zevent.
# Only one message per ZED_EMAIL_INTERVAL_SECS will be sent for a given
# class/pool combination. This protects against spamming the recipient
# should multiple events occur together in time for the same pool.
# Exit codes:
# 0: email sent
# 1: email failed
# 2: email suppressed
# 3: missing executable
# 4: unsupported event class
# 5: internal error
# State File Format:
# POOL:TIME_OF_LAST_EMAIL
#
test -f "${ZED_SCRIPT_DIR}/zed.rc" && . "${ZED_SCRIPT_DIR}/zed.rc"
test -n "${ZEVENT_POOL}" || exit 5
test -n "${ZEVENT_SUBCLASS}" || exit 5
if test "${ZEVENT_SUBCLASS}" != "data"; then \
logger -t "${ZED_SYSLOG_TAG:=zed}" \
-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
`basename "$0"`: unsupported event class \"${ZEVENT_SUBCLASS}\"
exit 4
fi
# Only send email if ZED_EMAIL has been configured.
test -n "${ZED_EMAIL}" || exit 2
# Ensure requisite executables are installed.
if ! command -v "${MAIL:=mail}" >/dev/null 2>&1; then
logger -t "${ZED_SYSLOG_TAG:=zed}" \
-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
`basename "$0"`: "${MAIL}" not installed
exit 3
fi
NAME="zed.${ZEVENT_SUBCLASS}.email"
LOCKFILE="${ZED_LOCKDIR:=/var/lock}/${NAME}.lock"
STATEFILE="${ZED_RUNDIR:=/var/run}/${NAME}.state"
# Obtain lock to ensure mutual exclusion for accessing state.
exec 8> "${LOCKFILE}"
flock -x 8
# Query state for last time email was sent for this pool.
TIME_NOW=`date +%s`
TIME_LAST=`egrep "^${ZEVENT_POOL}:" "${STATEFILE}" 2>/dev/null | cut -d: -f2`
if test -n "${TIME_LAST}"; then
TIME_DELTA=`expr "${TIME_NOW}" - "${TIME_LAST}"`
if test "${TIME_DELTA}" -lt "${ZED_EMAIL_INTERVAL_SECS:=3600}"; then
exit 2
fi
fi
"${MAIL}" -s "ZFS ${ZEVENT_SUBCLASS} error for ${ZEVENT_POOL} on `hostname`" \
"${ZED_EMAIL}" <<EOF
A ZFS ${ZEVENT_SUBCLASS} error has been detected:
eid: ${ZEVENT_EID}
host: `hostname`
time: ${ZEVENT_TIME_STRING}
pool: ${ZEVENT_POOL}
EOF
MAIL_STATUS=$?
# Update state.
egrep -v "^${ZEVENT_POOL}:" "${STATEFILE}" 2>/dev/null > "${STATEFILE}.$$"
echo "${ZEVENT_POOL}:${TIME_NOW}" >> "${STATEFILE}.$$"
mv -f "${STATEFILE}.$$" "${STATEFILE}"
if test "${MAIL_STATUS}" -ne 0; then
logger -t "${ZED_SYSLOG_TAG:=zed}" \
-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
`basename "$0"`: "${MAIL}" exit="${MAIL_STATUS}"
exit 1
fi
exit 0
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