switch service signaling to netcat

    * fixes linuxserver/docker-calibre#10

Author: Carlos Hernandez

Dockerfile

@@ -18,6 +18,7 @@ RUN \
 	libxfixes3 \
 	libxml2 \
 	libxrandr2 \
+	netcat-traditional \
 	openbox \
 	pulseaudio \
 	x11-apps \

Dockerfile.aarch64

@@ -18,6 +18,7 @@ RUN \
 	libxfixes3 \
 	libxml2 \
 	libxrandr2 \
+	netcat-traditional \
 	openbox \
 	pulseaudio \
 	x11-apps \

Dockerfile.armhf

@@ -18,6 +18,7 @@ RUN \
 	libxfixes3 \
 	libxml2 \
 	libxrandr2 \
+	netcat-traditional \
 	openbox \
 	pulseaudio \
 	x11-apps \

root/etc/services.d/xrdp/run

@@ -4,7 +4,7 @@
 fdmove -c 2 1
 
 # Notify service manager when xrdp is up
-s6-notifyoncheck -w 500 -c "redirfd -w 1 /dev/null fdmove -c 2 1 s6-tcpclient 127.0.0.1 3389 true"
+s6-notifyoncheck -w 500 -c "redirfd -w 1 /dev/null fdmove -c 2 1 nc -w 1 -z -v 127.0.0.1 3389"
 
 # Wait until Xorg is running
 if { s6-svwait -t 10000 -U /var/run/s6/services/Xorg/ }