Fix slow shutdown issue

Fix slow shutdown issue

agent/agent.sh

@@ -1,10 +1,18 @@
 #!/usr/bin/env bash
 set -u
 
-declare nmi
+# Functions
+
+snore()
+{
+    local IFS
+    [[ -n "${_snore_fd:-}" ]] || exec {_snore_fd}<> <(:)
+    read ${1:+-t "$1"} -u $_snore_fd || :
+}
 
 function checkNMI {
 
+  local nmi
   nmi=$(awk '/NMI/ {for (i=2; i<=NF; i++) if ($i ~ /^[0-9]+$/) {sum+=$i}} END {print sum}' /proc/interrupts)
 
   if [ "$nmi" != "" ] && [ "$nmi" -ne "0" ]; then
@@ -12,15 +20,28 @@ function checkNMI {
     echo "Received shutdown request through NMI.." > /dev/ttyS0
 
     /usr/syno/sbin/synoshutdown -s > /dev/null
-    exit 0
+    exit
 
   fi
 
 }
 
+finish() {
+
+  echo "Shutting down agent.." > /dev/ttyS0
+  exit
+
+}
+
+trap finish SIGINT SIGTERM
+
+# Setup serialport
+
 chmod 666 /dev/ttyS0
 checkNMI
 
+# Install packages 
+
 first_run=false
 
 for filename in /usr/local/packages/*.spk; do
@@ -50,14 +71,17 @@ else
 
 fi
 
+# Display message in docker log output
+
 echo "-------------------------------------------" > /dev/ttyS0
 echo " You can now login to DSM at port 5000     " > /dev/ttyS0
 echo "-------------------------------------------" > /dev/ttyS0
 
+# Wait for NMI interrupt as a shutdown signal
+
 while true; do
 
   checkNMI
-  sleep 2
+  snore 2
 
 done
-

run/install.sh

@@ -160,7 +160,7 @@ cp /agent/service.sh $LOC/agent.sh
 chmod +x $LOC/agent.sh
 
 # Store agent version
-echo "2" > "$STORAGE"/"$BASE".agent
+echo "3" > "$STORAGE"/"$BASE".agent
 
 echo "Install: Installing system partition..."
 

run/power.sh

@@ -12,7 +12,6 @@ _QEMU_SHUTDOWN_COUNTER=/run/qemu.counter
 rm -f "${_QEMU_PID}"
 rm -f "${_QEMU_SHUTDOWN_COUNTER}"
 
-# Allows for troubleshooting signals sent to the process
 _trap(){
     func="$1" ; shift
     for sig ; do
@@ -20,6 +19,13 @@ _trap(){
     done
 }
 
+snore()
+{
+    local IFS
+    [[ -n "${_snore_fd:-}" ]] || exec {_snore_fd}<> <(:)
+    read ${1:+-t "$1"} -u $_snore_fd || :
+}
+
 _graceful_shutdown(){
 
   local QEMU_MONPORT="${QEMU_MONPORT:-7100}"

run/run.sh

@@ -52,7 +52,7 @@ set -m
 )
 set +m
 
-# Since we have to start the process with -m, we need to poll every intervall if it's still running
+# Since we started the QEMU process with -m, we need to poll if it's still running
 while [ -d "/proc/$(cat ${_QEMU_PID})"  ]; do
-  sleep 1
+  snore 1
 done