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The executables invoked by the ZED in response to a given zevent have been generically referred to as "scripts". By convention, these scripts have aimed to be /bin/sh compatible for reasons of portability and comprehensibility. However, the ZED only requires they be executable and (ideally) capable of reading environment variables. As such, these scripts are now referred to as ZEDLETs (ZFS Event Daemon Linkage for Executable Tasks). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2735
82 lines
2.3 KiB
Bash
Executable File
82 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Send email to ZED_EMAIL in response to a DATA zevent.
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# Only one message per ZED_EMAIL_INTERVAL_SECS will be sent for a given
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# class/pool combination. This protects against spamming the recipient
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# should multiple events occur together in time for the same pool.
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# Exit codes:
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# 0: email sent
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# 1: email failed
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# 2: email suppressed
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# 3: missing executable
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# 4: unsupported event class
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# 5: internal error
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# State File Format:
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# POOL;TIME_OF_LAST_EMAIL
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#
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test -f "${ZED_ZEDLET_DIR}/zed.rc" && . "${ZED_ZEDLET_DIR}/zed.rc"
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test -n "${ZEVENT_POOL}" || exit 5
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test -n "${ZEVENT_SUBCLASS}" || exit 5
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if test "${ZEVENT_SUBCLASS}" != "data"; then \
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logger -t "${ZED_SYSLOG_TAG:=zed}" \
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-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
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`basename "$0"`: unsupported event class \"${ZEVENT_SUBCLASS}\"
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exit 4
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fi
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# Only send email if ZED_EMAIL has been configured.
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test -n "${ZED_EMAIL}" || exit 2
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# Ensure requisite executables are installed.
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if ! command -v "${MAIL:=mail}" >/dev/null 2>&1; then
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logger -t "${ZED_SYSLOG_TAG:=zed}" \
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-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
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`basename "$0"`: "${MAIL}" not installed
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exit 3
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fi
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NAME="zed.${ZEVENT_SUBCLASS}.email"
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LOCKFILE="${ZED_LOCKDIR:=/var/lock}/${NAME}.lock"
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STATEFILE="${ZED_RUNDIR:=/var/run}/${NAME}.state"
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# Obtain lock to ensure mutual exclusion for accessing state.
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exec 8> "${LOCKFILE}"
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flock -x 8
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# Query state for last time email was sent for this pool.
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TIME_NOW=`date +%s`
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TIME_LAST=`egrep "^${ZEVENT_POOL};" "${STATEFILE}" 2>/dev/null | cut -d ";" -f2`
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if test -n "${TIME_LAST}"; then
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TIME_DELTA=`expr "${TIME_NOW}" - "${TIME_LAST}"`
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if test "${TIME_DELTA}" -lt "${ZED_EMAIL_INTERVAL_SECS:=3600}"; then
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exit 2
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fi
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fi
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"${MAIL}" -s "ZFS ${ZEVENT_SUBCLASS} error for ${ZEVENT_POOL} on `hostname`" \
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"${ZED_EMAIL}" <<EOF
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A ZFS ${ZEVENT_SUBCLASS} error has been detected:
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eid: ${ZEVENT_EID}
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host: `hostname`
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time: ${ZEVENT_TIME_STRING}
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pool: ${ZEVENT_POOL}
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EOF
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MAIL_STATUS=$?
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# Update state.
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egrep -v "^${ZEVENT_POOL};" "${STATEFILE}" 2>/dev/null > "${STATEFILE}.$$"
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echo "${ZEVENT_POOL};${TIME_NOW}" >> "${STATEFILE}.$$"
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mv -f "${STATEFILE}.$$" "${STATEFILE}"
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if test "${MAIL_STATUS}" -ne 0; then
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logger -t "${ZED_SYSLOG_TAG:=zed}" \
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-p "${ZED_SYSLOG_PRIORITY:=daemon.warning}" \
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`basename "$0"`: "${MAIL}" exit="${MAIL_STATUS}"
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exit 1
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fi
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exit 0
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