47 lines
1.1 KiB
Django/Jinja
47 lines
1.1 KiB
Django/Jinja
#!/bin/bash
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# Check if the script is run by root
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if [ "$EUID" -ne 0 ]
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then echo "Please run as root"
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exit
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fi
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# MQTT broker details
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BROKER="{{ kiosk_mqtt_host }}"
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TOPIC="{{ kiosk_mqtt_topic }}"
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# Variable to store the PID of the fbi process
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fbi_pid=0
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# Function to be executed on SIGTERM
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on_sigterm() {
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echo "SIGTERM received, exiting..."
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# Kill the fbi process
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# As the process forks itself, we do not get a reliable PID and killall is needed
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killall fbi
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# Remove the temporary file
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rm -f /tmp/grafana.png
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exit 0
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}
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# Trap SIGTERM and call on_sigterm() when it is received
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trap 'on_sigterm' SIGTERM
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while true
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do
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# Subscribe to the topic and save received data to a file
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mosquitto_sub -h $BROKER -t $TOPIC -C 1 > /tmp/grafana.png
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# Kill the previous fbi process
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# As the process forks itself, we do not get a reliable PID and killall is needed
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killall fbi
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# Display the image
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fbi -T 1 -noverbose -a /tmp/grafana.png &
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# Wait to avoid a race condition between
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# fbi starting and mosquitto truncating the file
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sleep 1
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done
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