background service #160

home.admin/_background.sh

@@ -0,0 +1,111 @@
+#!/bin/bash
+
+# This script runs on after start in background
+# as a service and gets restarted on failure
+# it runs ALMOST every seconds
+
+# INFOFILE - state data from bootstrap
+infoFile="/home/admin/raspiblitz.info"
+
+# CONFIGFILE - configuration of RaspiBlitz
+configFile="/mnt/hdd/raspiblitz.conf"
+
+# Check if HDD contains configuration
+configExists=$(ls ${configFile} | grep -c '.conf')
+if [ ${configExists} -eq 1 ]; then
+    source ${configFile}
+fi
+
+counter=0
+while [ 1 ]
+do
+
+  ###############################
+  # Prepare this loop
+  ###############################
+
+  # count up
+  counter=$(($counter+1))
+  echo "counter($counter)"
+
+  ####################################################
+  # RECHECK DHCP-SERVER 
+  # https://github.com/rootzoll/raspiblitz/issues/160
+  ####################################################
+
+  # every 5 minutes
+  triggerRecheckDHCP=$(((counter % 300)+1))
+  if [ triggerRecheckDHCP -eq 1 ]; then
+    echo "*** RECHECK DHCP-SERVER  ***"
+
+    # get the local network IP
+    localip=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
+    echo "localip(${localip})"
+
+    # detect a missing DHCP config 
+    if [ "${localip:0:4}" = "169." ]; then
+      echo "Missing DHCP detected ... trying emergency reboot"
+      sudo shutdown -r now
+    else
+      echo "DHCP OK"
+    fi
+
+  fi
+
+  ####################################################
+  # RECHECK PUBLIC IP
+  # when public IP changes, restart LND with new IP
+  ####################################################
+
+  # every 15min - not too often
+  # because its a ping to external service
+  recheckPublicIP=$(((counter % 60)+1))
+  if [ recheckPublicIP -eq 1 ]; then
+    echo "*** RECHECK PUBLIC IP ***"
+
+    # execute only after setup when config exists
+    if [ ${configExists} -eq 1 ]; then
+
+      # get actual public IP
+      freshPublicIP=$(curl -s http://v4.ipv6-test.com/api/myip.php 2>/dev/null)
+      echo "freshPublicIP(${freshPublicIP})"
+      echo "publicIP(${publicIP})"
+
+      # check if changed
+      if [ "${freshPublicIP}" != "${publicIP}" ]; then
+
+        # 1) update config file
+        echo "update config value"
+        sed -i "s/^publicIP=.*/publicIP=${freshPublicIP}/g" ${configFile}
+        publicIP=${freshPublicIP}
+
+        # 2) restart the LND
+        echo "restart LND with new environment config"
+        sudo systemctl restart lnd.service
+
+      else
+        echo "public IP has not changed"
+      fi
+
+    else
+      echo "skip - because setup is still running"
+    fi
+
+  fi
+
+  ###############################
+  # Prepare next loop
+  ###############################
+
+  # sleep 1 sec
+  sleep 1
+
+  # limit counter to max seconds per week:
+  # 604800 = 60sec * 60min * 24hours * 7days
+  if [ ${counter} -gt 1000 ]; then
+    counter=0
+    echo "counter zero reset"
+  fi
+
+done
+