init

Dockerfile

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+FROM debian:bookworm-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install packages
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+      openssh-server \
+      dosemu2 \
+      dosbox-staging \
+      busybox-static \
+      sudo \
+      ca-certificates \
+      curl \
+      && rm -rf /var/lib/apt/lists/*
+
+# Provide DOS wrapper and service supervisor
+COPY dos-shell /usr/local/bin/dos-shell
+COPY start-services.sh /usr/local/bin/start-dos-services
+RUN chmod +x /usr/local/bin/dos-shell /usr/local/bin/start-dos-services && \
+    echo "/usr/local/bin/dos-shell" >> /etc/shells
+
+# Create sshd runtime directory
+RUN mkdir -p /var/run/sshd
+
+# Create dos user
+RUN useradd -m -s /usr/local/bin/dos-shell dosuser && \
+    mkdir -p /home/dosuser/.ssh && chown -R dosuser:dosuser /home/dosuser && \
+    echo "dosuser:dosuser" | chpasswd
+
+# Create directories for allowed DOS files and the C: drive mount
+RUN mkdir -p /opt/allowed_repo /cdrive /etc/dos_env && \
+    chown -R dosuser:dosuser /opt/allowed_repo /cdrive
+
+# Default allowed list (can be overridden with a bind mount)
+COPY dos_allowed /etc/dos_allowed
+
+# Configure sshd to force command for dosuser
+COPY sshd_config /etc/ssh/sshd_config
+
+EXPOSE 22 23
+CMD ["/usr/local/bin/start-dos-services"]