lightup script

lightup.sh

#!/bin/bash
echo 18 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value

LAST=`curl -s https://api-davidt-staging.foursquare.com/norep.id`
echo "`date` starting up..."
echo "`date` initial id: $LAST"
killfile=/opt/watcher.kill

if [ -f "$killfile" ]; then
  rm "$killfile"
fi

COUNTER=0

echo 0 > /sys/class/gpio/gpio18/value
sleep 1
echo 1 > /sys/class/gpio/gpio18/value


while [ ! -f "$killfile" ]; do
  ID=`curl -s https://api-davidt-staging.foursquare.com/norep.id`

  if [ -z "$ID" ]; then
    echo ""
    echo "`date` skipping blank ID"
    ID="$LAST"
  fi

  if [ "$ID" != "$LAST" ]; then
    echo ""
    echo "`date` changed: $LAST -> $ID"
    echo 0 > /sys/class/gpio/gpio18/value
    sleep 8
    echo 1 > /sys/class/gpio/gpio18/value
    COUNTER=0
  else
    COUNTER=$(((COUNTER + 1) % 3600))
    if [ $COUNTER -eq 0 ]; then
      echo "`date` still waiting..."
    fi
    if [ $((COUNTER % 30)) -eq 0 ]; then
      printf "."
    fi
  fi

  LAST="$ID"
  sleep 1
done

echo "exiting due to kill file"

rm "$killfile"