xauth

Dockerfile

@@ -5,7 +5,6 @@ ENV DEBIAN_FRONTEND=noninteractive
 # 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 \
       busybox-static \
@@ -15,6 +14,7 @@ RUN apt-get update && \
       mtools \
       unzip \
       file \
+      xauth \
       && add-apt-repository -y ppa:dosemu2/ppa && \
       apt-get install -y --no-install-recommends \
         dosemu2 \

config/sshd_config

@@ -6,7 +6,9 @@ PermitRootLogin no
 PasswordAuthentication yes
 ChallengeResponseAuthentication no
 UsePAM yes
-X11Forwarding no
+X11Forwarding yes
+X11DisplayOffset 10
+X11UseLocalhost no
 PrintMotd no
 AcceptEnv LANG LC_*
 Subsystem   sftp    /usr/lib/openssh/sftp-server

scripts/dos-shell

@@ -31,7 +31,32 @@ fi
 DOSEMU_DIR="${DOS_HOME}/.dosemu"
 C_DRIVE="${DOSEMU_DIR}/drive_c"
 INSTALL_MARKER="${DOSEMU_DIR}/${INSTALL_SENTINEL}"
+detect_dosemu_args() {
+  local mode="${DOS_TERMINAL_MODE:-auto}"
+  if [ "${mode}" = "auto" ]; then
+    if [ -n "${DISPLAY:-}" ]; then
+      mode="x"
+    else
+      mode="terminal"
+    fi
+  fi
+
+  case "${mode,,}" in
+    x|sdl|window|gui)
+      DOSEMU_ARGS=(-X -K "${C_DRIVE}")
+      ;;
+    terminal|tty|text)
+      DOSEMU_ARGS=(-td -K "${C_DRIVE}")
+      ;;
+    dumb)
       DOSEMU_ARGS=(-dumb -K "${C_DRIVE}")
+      ;;
+    *)
+      echo "Unknown DOS_TERMINAL_MODE '${mode}', defaulting to terminal mode." >&2
+      DOSEMU_ARGS=(-td -K "${C_DRIVE}")
+      ;;
+  esac
+}
 allowed_entries=()
 
 mkdir -p "${DOSEMU_DIR}" "${C_DRIVE}"
@@ -180,11 +205,14 @@ if needs_install; then
   if run_headless_install; then
     set_install_marker
     echo "SvarDOS provisioning complete."
+    echo "Disconnecting. Reconnect via SSH to start the SvarDOS shell."
+    exit 0
   else
     exit 1
   fi
 fi
 
+detect_dosemu_args
 sync_allowed_content
 apply_templates