init: added basic ubuntu desktop with vnc, de, shell, and fs

Author: MatricalDefunkt

Dockerfile

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+# Use Ubuntu 22.04 as base
+FROM ubuntu:22.04 AS base
+
+# Avoid interactive prompts during installation
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install core utilities
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  sudo \
+  wget \
+  net-tools \
+  dbus-x11 \
+  && rm -rf /var/lib/apt/lists/*
+
+# Stage for desktop environment
+FROM base AS desktop
+# Install XFCE related packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  xfce4 \
+  xfce4-goodies \
+  xfonts-base \
+  xauth \
+  && rm -rf /var/lib/apt/lists/*
+
+# Stage for VNC setup
+FROM desktop AS vnc
+# Install VNC related packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  tightvncserver \
+  novnc \
+  websockify \
+  && rm -rf /var/lib/apt/lists/*
+
+# Final stage
+FROM vnc AS final
+
+# Create a non-root user 'sandbox'
+RUN useradd -m -s /bin/bash sandbox && \
+  echo "sandbox:password" | chpasswd && \
+  adduser sandbox sudo
+
+# Set up VNC directory and password for the sandbox user
+RUN mkdir -p /home/sandbox/.vnc && \
+  echo "password" | vncpasswd -f > /home/sandbox/.vnc/passwd
+
+# Create an empty .Xauthority file
+RUN touch /home/sandbox/.Xauthority
+
+# Set ownership and permissions for VNC and Xauthority files
+RUN chown -R sandbox:sandbox /home/sandbox/.vnc /home/sandbox/.Xauthority && \
+  chmod 0600 /home/sandbox/.vnc/passwd && \
+  chmod 0600 /home/sandbox/.Xauthority
+
+# Copy startup and self-destruct scripts
+COPY entrypoint.sh /entrypoint.sh
+COPY self_destruct.sh /self_destruct.sh
+RUN chmod +x /entrypoint.sh /self_destruct.sh
+
+# Expose noVNC port
+EXPOSE 6080
+
+# Set user and working directory
+USER sandbox
+WORKDIR /home/sandbox
+
+# Set the entrypoint script
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

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+#!/bin/bash
+
+# Start the self-destruct timer in the background
+/self_destruct.sh &
+
+# Explicitly set the USER environment variable
+export USER=sandbox
+
+# Start VNC server on display :1 with specific geometry and depth
+# Removed invalid '-localhost no' option
+vncserver :1 -geometry 1280x800 -depth 24 -rfbport 5901
+
+# Start noVNC using websockify, listening on port 6080 and forwarding to VNC server on 5901
+websockify --web /usr/share/novnc/ 6080 localhost:5901 &
+
+# Keep the container running - tailing the VNC log is a simple way
+# Wait a moment for the log file to be created
+sleep infinity

self_destruct.sh

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+#!/bin/bash
+
+echo "Container will self-destruct in 10 minutes."
+sleep 600 # 10 minutes * 60 seconds/minute
+
+echo "Time's up! Stopping container."
+# A simple way to stop the container is to kill the entrypoint process (PID 1)
+kill 1