setup-systemd-test-shutdown.sh

setup.sh

#!/bin/sh

rm /tmp/process-log-shutdown.txt
rm /tmp/last-shutdown.txt

cat > "//usr/local/bin/fake-daemon.sh" << 'EOF'
#!/bin/sh

OUTFILE=/tmp/process-log-shutdown.txt
SLEEP_PID=
MYPID=$$

function logshutdown {
    printf "$(date) PID: $MYPID: " >> $OUTFILE
    for i in $(seq 1 5); do printf "$i " >> $OUTFILE; sleep 1; done
    echo " ... done" >> $OUTFILE
}

trap "echo SIGHUP >> $OUTFILE; logshutdown" SIGHUP
trap "echo SIGTERM >> $OUTFILE; logshutdown; exit" SIGTERM
trap '[[ $SLEEP_PID ]] && kill $SLEEP_PID' EXIT

echo "MY PID: $MYPID"

while true;
do
    echo "$(date) PID: $MYPID"

    # when a SIGHUP or SIGINT comes in we don't want to wait
    # for `sleep` to finish. So we use this and trap / kill SLEEP
    # when we need to, ref: http://mywiki.wooledge.org/SignalTrap
    sleep 10 & SLEEP_PID=$!
    wait
    SLEEP_PID=
done

EOF
cat > "/usr/local/bin/log-shutdown.sh" << 'EOF'
#!/bin/sh

/bin/date "+shutdown: %Y-%m-%d-%H:%M:%S" >> /tmp/last-shutdown.txt

for i in $(seq 1 5); do printf "$i " >> /tmp/last-shutdown.txt; sleep 1; done

printf "\n"  >> /tmp/last-shutdown.txt

EOF

chmod +x /usr/local/bin/log-shutdown.sh

cat > "/usr/lib/systemd/system/test-shutdown.service" << EOF
[Unit]
Description=test systemd shutdown
After=syslog.target network-online.target

[Service]
Type=oneshot
RemainAfterExit=true
WorkingDirectory=/tmp

ExecStart=/bin/true
ExecStop=/usr/local/bin/log-shutdown.sh

[Install]
WantedBy=multi-user.target
EOF

cat > "/usr/lib/systemd/system/fake-daemon.service" << 'EOF'
[Unit]
Description=test systemd shutdown
After=syslog.target network-online.target

[Service]
Type=simple
WorkingDirectory=/tmp

ExecStart=/usr/local/bin/fake-daemon.sh
ExecStop=/usr/bin/sh -c "/bin/kill --signal SIGTERM $MAINPID; while ps -p $MAINPID > /dev/null; do sleep 1; done"

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable test-shutdown.service
systemctl enable fake-daemon.service
systemctl restart test-shutdown.service
systemctl restart fake-daemon.service