Add novnc/Dockerfile

novnc/Dockerfile

@@ -0,0 +1,49 @@
+# syntax = docker/dockerfile:1
+FROM alpine/base
+USER root
+
+# ENV variables
+# Required
+ENV MYVNC_VNCCLIENT_HOST=
+ENV MYVNC_VNCCLIENT_PORT=
+# Optional
+ENV MYVNC_VNCSERVER_PORT=
+
+# Run
+RUN apk add --no-cache \
+    openssh-client \
+    && <<- '01-init' cat >>/app/init.d/01-init.sh
+
+# Check for client variables
+if ! [ ${MYVNC_VNCCLIENT_HOST} ]
+then
+    echo "Variable MYVNC_VNCCLIENT_HOST is missing."
+    echo "Exiting..."
+    exit 1
+fi
+if ! [ ${MYVNC_VNCCLIENT_PORT} ]
+then
+    echo "Variable MYVNC_VNCCLIENT_PORT is missing."
+    echo "Exiting..."
+    exit 1
+fi
+if ! [[ ${MYVNC_VNCCLIENT_PORT} =~ ^[0-9]+$ ]]
+then
+    echo "Variable MYVNC_VNCCLIENT_PORT is invalid."
+    echo "Exiting..."
+    exit 1
+fi
+
+# Read ssh client variables hostname and port (5900, 5901, 5902, etc)
+if ssh ${MYVNC_VNCCLIENT_HOST} exit
+then
+    ssh ${MYVNC_VNCCLIENT_HOST} -L ${MYVNC_VNCSERVER_PORT:-5900}:localhost:${MYVNC_VNCCLIENT_PORT} &
+else
+    echo "Unable to establish SSH tunnel."
+    echo "Exiting..."
+    exit 1
+fi
+01-init
+
+# Reset user home directory
+USER user