x11vnc: autorestart and logging (#54)

computer-use-demo/image/x11vnc_startup.sh

@@ -12,6 +12,8 @@ echo "starting vnc"
     -rfbport 5900 \
     2>/tmp/x11vnc_stderr.log) &
 
+x11vnc_pid=$!
+
 # Wait for x11vnc to start
 timeout=10
 while [ $timeout -gt 0 ]; do
@@ -23,9 +25,25 @@ while [ $timeout -gt 0 ]; do
 done
 
 if [ $timeout -eq 0 ]; then
-    echo "x11vnc stderr output:" >&2
+    echo "x11vnc failed to start, stderr output:" >&2
     cat /tmp/x11vnc_stderr.log >&2
     exit 1
 fi
 
-rm /tmp/x11vnc_stderr.log
+: > /tmp/x11vnc_stderr.log
+
+# Monitor x11vnc process in the background
+(
+    while true; do
+        if ! kill -0 $x11vnc_pid 2>/dev/null; then
+            echo "x11vnc process crashed, restarting..." >&2
+            if [ -f /tmp/x11vnc_stderr.log ]; then
+                echo "x11vnc stderr output:" >&2
+                cat /tmp/x11vnc_stderr.log >&2
+                rm /tmp/x11vnc_stderr.log
+            fi
+            exec "$0"
+        fi
+        sleep 5
+    done
+) &