experimental background monitoring

home.admin/51screenMonitor.sh

@@ -0,0 +1,101 @@
+# experimental script to let downloads run 
+# in background with screen an monitor
+
+name="Download"
+targetDir="./test/"
+targetSize=2085832
+maxTimeoutLoops=10
+command="wget -P ${targetDir} http://wiki.fulmo.org/downloads/raspiblitz-2018-07-29b.img.gz"
+
+# starting session if needed
+echo "checking if ${name} has a running screen session"
+screen -wipe 1>/dev/null
+isRunning=$( screen -S ${name} -ls | grep "${name}" -c )
+echo "isRunning(${isRunning})"
+if [ ${isRunning} -eq 0 ]; then
+  echo "Starting screen session"
+  screen -S ${name} -dm ${command}
+else
+  echo "Continue screen session"
+fi
+sleep 3
+
+# monitor session
+screenDump="... started ..."
+actualSize=0
+timeout=1
+timeoutInfo="-"
+while :
+  do
+
+    # check if session is still running
+    screen -wipe 1>/dev/null
+    isRunning=$( screen -S ${name} -ls | grep "${name}" -c )
+    if [ ${isRunning} -eq 0 ]; then
+      echo "OK - session finished"
+      break
+    fi
+
+    # calculate progress and write it to file for LCD to read
+    freshSize=$( du -s ${targetDir} | head -n1 | awk '{print $1;}' )
+    if [ ${#actualSize} -eq 0 ]; then
+      freshSize=0
+    fi
+    progress=$(echo "scale=2; $freshSize*100/$targetSize" | bc)
+    echo $progress > '.${name}.progress'
+
+    # detect if since last loop any progress occured
+    if [ ${actualSize} -eq ${freshSize} ]; then
+      timeoutInfo="${timeout}/${maxTimeoutLoops}"
+      timeout=$(( $timeout + 1 ))
+    else
+      timeout=1
+      timeoutInfo="no timeout detected"
+    fi
+    actualSize=$freshSize
+
+    # detect if mx timeout loop limit is reached
+    if [ ${timeout} -gt ${maxTimeoutLoops} ]; then
+      echo "FAIL - download hit timeout"
+      break
+    fi
+
+    # display info screen
+    clear
+    echo "****************************************"
+    echo "Monitoring Screen Session: ${name}"
+    echo "Progress: ${progress}% (${actualSize} of ${targetSize})"
+    echo "Timeout: ${timeoutInfo}"
+    echo "Press key x to abort this process"
+    echo "****************************************"
+    screen -S ${name} -X hardcopy .${name}.out
+    newScreenDump=$(cat .Download.out | grep . | tail -15)
+    if [ ${#newScreenDump} -gt 0 ]; then
+      screenDump=$newScreenDump
+    fi
+    echo $screenDump
+
+    # wait 2 seconds for key input
+    read -n 1 -t 2 keyPressed
+
+    # check if user wants to abort session
+    if [ "${keyPressed}" = "x" ]; then
+      echo ""
+      echo "Aborting ${name}"
+      break
+    fi
+
+  done
+
+# clean up
+rm -f .${name}.out
+rm -f .${name}.progress
+
+# quit session if still running
+if [ ${isRunning} -eq 1 ]; then
+  echo "killing screen session TODO: KILL PROCESS"
+  screen -S ${name} -X quit
+  sleep 3
+fi
+
+# decide on how to continue