62 lines
1.9 KiB
Bash
62 lines
1.9 KiB
Bash
#!/usr/bin/env sh
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# Send email notification from systemd.
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# Source: https://serverfault.com/questions/876233/how-to-send-an-email-if-a-systemd-service-is-restarted
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# Source: https://wiki.archlinux.org/index.php/Systemd/Timers#MAILTO
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# Usage: systemd-email <recipinent-email> <failed-systemd-unit-name>
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# According to
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# http://www.flashissue.com/blog/gmail-sending-limits/
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# Gmail blocks your account if you send more than 500 emails per day, which is one email every
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# (24 * 60 * 60) / 500 = 172.8 second => choose a min wait time which is significantly longer than this to be on the safe time to not exceed 500 emails per day.
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# However this source
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# https://group-mail.com/sending-email/email-send-limits-and-options/
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# says the limit when not using the Gmail webinterface but going directly to the SMTP server is 100-150 per day, which yelds maximum one email every
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# (24 * 60 * 60) / 100 = 864 second
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# One option that I used with my old Axis cameras it to use my gmx.com accunt for sending emails instead, as there are (no?) higher limits there.
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MIN_WAIT_TIME_S=900
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SCRIPT_NAME=$(basename $0)
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LAST_RUN_FILE="/tmp/${SCRIPT_NAME}_last_run.txt"
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last_touch() {
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stat -c %Y $1
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}
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waited_long_enough() {
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retval=1
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if [ -e $LAST_RUN_FILE ]; then
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now=$(date +%s)
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last=$(last_touch $LAST_RUN_FILE)
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wait_s=$(expr $now - $last)
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if [ "$wait_s" -gt "$MIN_WAIT_TIME_S" ]; then
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retval=0
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fi
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else
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retval=0
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fi
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[ $retval -eq 0 ] && touch $LAST_RUN_FILE
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return $retval
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}
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# Make sure that my Gmail account dont' get shut down because of sending too many emails!
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if ! waited_long_enough; then
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echo "Systemd email was not sent, as it's less than ${MIN_WAIT_TIME_S} seconds since the last one was sent."
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exit 1
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fi
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recipinent=$1
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system_unit=$2
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sendmail -t <<ERRMAIL
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To: $recipinent
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From: systemd <root@$HOSTNAME>
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Subject: [systemd-email] ${system_unit}
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Content-Transfer-Encoding: 8bit
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Content-Type: text/plain; charset=UTF-8
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$(systemctl status --full "$system_unit")
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ERRMAIL
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