shutdown-after-sleep.sh

#!/bin/sh --

sysd=/etc/systemd/system

set -e

mkdir -p "$sysd/systemd-suspend.service.d"

cat > "$sysd/systemd-suspend.service.d/99-trigger-system-back-after-suspend.conf" <<'EOF'
[Service]
ExecStopPost=-/bin/systemctl --no-block start system-is-back-after-suspend.target
EOF

cat > "$sysd/cancel-self-poweroff.service" <<'EOF'
[Unit]
Description=Cancel self-poweroff after suspend
After=system-is-back-after-suspend.target
Conflicts=self-poweroff.timer

[Service]
Type=oneshot
ExecStart=/bin/rm -f /run/systemd/system/self-poweroff.timer

[Install]
WantedBy=system-is-back-after-suspend.target
EOF

cat > "$sysd/self-poweroff.service" <<'EOF'
[Unit]
Description=Actual self-poweroff after suspend
After=suspend.target
Before=system-is-back-after-suspend.target
RefuseManualStart=true

[Service]
Type=oneshot
ExecStart=/bin/systemctl --no-block poweroff
# Uncomment the following line while commenting out the above line for testing.
#ExecStart=/bin/echo poweroff
# Note the echoed string goes to systemd journal log.
# Do a `systemctl daemon-reload` after modifying this file.
EOF

cat > "$sysd/schedule-self-poweroff.service" <<'EOF'
[Unit]
Description=Schedulation of self-poweroff after some time spent in suspend state
Before=systemd-suspend.service
Requisite=suspend.target

[Service]
Type=oneshot
EnvironmentFile=/etc/self-poweroff.conf
ExecStart=/bin/sh -c 'systemd-run --on-calendar="$(date -d "now + ${MY_SUSPEND_TIMEOUT}" "+%%Y-%%m-%%d %%H:%%M:%%S")" --timer-property=AccuracySec=1s --timer-property=WakeSystem=yes --timer-property=Persistent=yes --unit=self-poweroff.service'
# Do a `systemctl daemon-reload` after modifying this file.

[Install]
WantedBy=suspend.target
EOF

cat > "$sysd/system-is-back-after-suspend.target" <<'EOF'
[Unit]
Description=Synchronization point for self-poweroff after suspend
DefaultDependencies=no
After=suspend.target
StopWhenUnneeded=yes
EOF

cat > /etc/self-poweroff.conf <<'EOF'
MY_SUSPEND_TIMEOUT=4 hours
EOF

systemctl enable schedule-self-poweroff.service cancel-self-poweroff.service
systemctl daemon-reload