kumquat-buildroot/package/mender/mender-client.service

[Unit]
Description=Mender OTA update service
After=systemd-resolved.service

[Service]
Type=idle
User=root
Group=root
ExecStartPre=/bin/sh -c '\
if [ -L /var/lib/mender \
     -a "$(readlink /var/lib/mender)" = "/var/run/mender" ]; then \
    if rm -f /var/lib/mender >/dev/null 2>&1; then \
        mkdir -p /var/lib/mender; \
    else \
        echo "No persistent location to store mender data. Data will be lost" \
        echo "at reboot. Are you sure this is what you want to do?"; \
        mkdir -p "$(readlink /var/lib/mender)"; \
    fi; \
fi'
ExecStart=/usr/bin/mender -daemon
Restart=on-abort

[Install]
WantedBy=multi-user.target