it boots

Dockerfile

@@ -1,23 +1,31 @@
-FROM debian:bookworm-slim
+FROM ubuntu:22.04
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Install packages
+# Install base packages and enable the dosemu2 PPA
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
+      software-properties-common \
+      gnupg \
       openssh-server \
-      dosemu2 \
-      dosbox-staging \
       busybox-static \
       sudo \
       ca-certificates \
       curl \
+      mtools \
+      unzip \
+      file \
+      && add-apt-repository -y ppa:dosemu2/ppa && \
+      apt-get update && \
+      apt-get install -y --no-install-recommends \
+        dosemu2 \
       && 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 && \
+# Provide DOS wrapper, SvarDOS bootstrapper, and service supervisor
+COPY scripts/dos-shell /usr/local/bin/dos-shell
+COPY scripts/prepare-svardos.sh /usr/local/bin/prepare-svardos
+COPY scripts/start-services.sh /usr/local/bin/start-dos-services
+RUN chmod +x /usr/local/bin/dos-shell /usr/local/bin/start-dos-services /usr/local/bin/prepare-svardos && \
     echo "/usr/local/bin/dos-shell" >> /etc/shells
 
 # Create sshd runtime directory
@@ -29,14 +37,20 @@ RUN useradd -m -s /usr/local/bin/dos-shell 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 && \
+RUN mkdir -p /opt/allowed_repo /cdrive /etc/dos_env /opt/svardos && \
     chown -R dosuser:dosuser /opt/allowed_repo /cdrive
 
+# Download and stage SvarDOS base files
+ARG SVARDOS_IMG_URL
+ENV SVARDOS_IMG_URL=${SVARDOS_IMG_URL}
+RUN /usr/local/bin/prepare-svardos && \
+    chown -R dosuser:dosuser /opt/svardos
+
 # Default allowed list (can be overridden with a bind mount)
-COPY dos_allowed /etc/dos_allowed
+COPY config/dos_allowed /etc/dos_allowed
 
 # Configure sshd to force command for dosuser
-COPY sshd_config /etc/ssh/sshd_config
+COPY config/sshd_config /etc/ssh/sshd_config
 
 EXPOSE 22 23
 CMD ["/usr/local/bin/start-dos-services"]