Improve testing tools

toolchain/Dockerfile.run

@@ -4,7 +4,8 @@ RUN apt-get update && \
     apt-get install -y \
     qemu-system-x86 \
     gdb \
-    novnc
+    novnc \
+    netcat
 
 ENV MITTOS64 "true"
 ENV BUILDROOT "/opt"

toolchain/run-entrypoint.sh

@@ -4,4 +4,11 @@ if [[ -n "$WEBSOCK" ]]; then
     websockify --web /usr/share/novnc 6080 localhost:5900 &
 fi
 
+if [[ -n "$WAITHOST" ]]; then
+    until nc -z "${WAITHOST}" "${WAITPORT:-1234}" >/dev/null 2>&1; do
+        >&2 echo "Waiting for ${WAITHOST} ${WAITPORT:-1234}"
+        sleep 1
+    done
+fi
+
 eval "$@"