cleanup
This commit is contained in:
randogoth
parent
daae8bd74e
commit
eca967a494
3 changed files with 162 additions and 138 deletions
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@ -1,57 +1,128 @@
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#!/bin/bash
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# /usr/local/bin/dos-shell
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# 1) reset C: drive contents to only the allowed files
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# 2) launch dosemu with /cdrive mounted as C:
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# Prepare the SvarDOS environment and launch dosemu.
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set -euo pipefail
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ALLOWED_LIST="/etc/dos_allowed"
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ALLOWED_REPO="/opt/allowed_repo" # repository of allowed DOS files stored in container
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C_DRIVE="/cdrive"
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ALLOWED_REPO="/opt/allowed_repo"
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ENV_DIR="/etc/dos_env"
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AUTOEXEC_TEMPLATE="${ENV_DIR}/AUTOEXEC.BAT"
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CONFIG_TEMPLATE="${ENV_DIR}/CONFIG.SYS"
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SVARDOS_BASE="/opt/svardos/base"
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ALLOW_MODE="${DOS_ALLOW_MODE:-all}" # default to exposing everything from the repo
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SVARDOS_ROOT="${SVARDOS_ROOT:-/opt/svardos}"
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SVARDOS_BASE="${SVARDOS_BASE:-${SVARDOS_ROOT}/base}"
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ALLOW_MODE="${DOS_ALLOW_MODE:-all}"
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DEFAULT_DOS_USER="dosuser"
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INSTALL_SENTINEL=".svardos_installed"
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if [ "$(id -u)" -eq 0 ]; then
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DOS_USER="${DEFAULT_DOS_USER}"
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DOS_HOME="$(getent passwd "${DOS_USER}" | cut -d: -f6)"
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else
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DOS_USER="$(id -un)"
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DOS_HOME="${HOME}"
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fi
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if [ -z "${DOS_HOME}" ]; then
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echo "Unable to determine home directory for ${DOS_USER}" >&2
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exit 1
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fi
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DOSEMU_DIR="${DOS_HOME}/.dosemu"
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C_DRIVE="${DOSEMU_DIR}/drive_c"
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DOSEMURC_PATH="${DOS_HOME}/.dosemurc"
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INSTALL_MARKER="${DOSEMU_DIR}/${INSTALL_SENTINEL}"
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DOSEMU_ARGS=(-quiet -t -K "${C_DRIVE}")
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allowed_entries=()
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mkdir -p "${DOSEMU_DIR}" "${C_DRIVE}"
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if [ "$(id -u)" -eq 0 ] && [ ! -d "${ENV_DIR}" ]; then
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mkdir -p "${ENV_DIR}"
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fi
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# clear C: drive to ensure only allowed programs are present
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rm -rf "${C_DRIVE:?}/"*
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mkdir -p "${C_DRIVE}"
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set_install_marker() {
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touch "${INSTALL_MARKER}"
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if [ "$(id -u)" -eq 0 ]; then
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chown "${DOS_USER}:${DOS_USER}" "${INSTALL_MARKER}"
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fi
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}
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has_svardos_installation() {
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if [ -f "${C_DRIVE}/KERNEL.SYS" ] || [ -f "${C_DRIVE}/kernel.sys" ]; then
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return 0
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fi
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if [ -f "${C_DRIVE}/BIN/PKG.EXE" ] || [ -f "${C_DRIVE}/bin/pkg.exe" ]; then
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return 0
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fi
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if [ -d "${C_DRIVE}/SVARDOS" ] || [ -d "${C_DRIVE}/svardos" ]; then
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return 0
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fi
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return 1
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}
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needs_install() {
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if [ "${DOS_FORCE_INSTALL:-0}" = "1" ]; then
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return 0
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fi
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if [ -f "${INSTALL_MARKER}" ]; then
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return 1
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fi
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if has_svardos_installation; then
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set_install_marker
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return 1
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fi
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return 0
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}
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stage_initial_install() {
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if [ ! -d "${SVARDOS_BASE}" ] || [ -z "$(ls -A "${SVARDOS_BASE}")" ]; then
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echo "SvarDOS base directory ${SVARDOS_BASE} is empty. Aborting." >&2
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exit 1
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fi
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rm -rf "${C_DRIVE:?}/"*
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# Seed the C: drive with the SvarDOS base image
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if [ -e "${SVARDOS_BASE}/COMMAND.COM" ] || [ -e "${SVARDOS_BASE}/command.com" ]; then
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cp -a "${SVARDOS_BASE}/." "${C_DRIVE}/"
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else
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echo "SvarDOS base not found in ${SVARDOS_BASE}. Aborting." >&2
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exit 1
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fi
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set_install_marker
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echo "SvarDOS base staged to ${C_DRIVE}"
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}
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# Sync additional DOS files into the C: drive
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allowed_entries=()
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case "${ALLOW_MODE}" in
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all)
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if [ -d "${ALLOWED_REPO}" ] && [ "$(ls -A "${ALLOWED_REPO}")" ]; then
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generate_dosemurc() {
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local boot_target="$1"
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{
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printf "%s\n" "\$_hdimage = \"${C_DRIVE}\""
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printf "%s\n" "\$_boot = \"${boot_target}\""
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printf "%s\n" "\$_emusys = \"drdos\""
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printf "%s\n" "\$_fdpp = (off)"
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} > "${DOSEMURC_PATH}"
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if [ -f "${ENV_DIR}/dosemurc" ]; then
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cat "${ENV_DIR}/dosemurc" >> "${DOSEMURC_PATH}"
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fi
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if [ "$(id -u)" -eq 0 ]; then
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chown "${DOS_USER}:${DOS_USER}" "${DOSEMURC_PATH}"
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fi
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}
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sync_allowed_content() {
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allowed_entries=()
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local mode="${ALLOW_MODE}"
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if [ "${mode}" = "all" ]; then
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if [ -d "${ALLOWED_REPO}" ] && [ "$(ls -A "${ALLOWED_REPO}" 2>/dev/null)" ]; then
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cp -a "${ALLOWED_REPO}/." "${C_DRIVE}/"
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allowed_entries+=("ALL")
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fi
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;;
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list|allowlist)
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;;
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*)
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echo "Unknown DOS_ALLOW_MODE '${ALLOW_MODE}', falling back to allowlist mode." >&2
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ALLOW_MODE="list"
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;;
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esac
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return
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fi
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if [ "${mode}" != "list" ] && [ "${mode}" != "allowlist" ]; then
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echo "Unknown DOS_ALLOW_MODE '${mode}', defaulting to allowlist mode." >&2
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mode="list"
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ALLOW_MODE="${mode}"
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fi
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if [ "${ALLOW_MODE}" != "all" ]; then
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if [ -f "${ALLOWED_LIST}" ]; then
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while IFS= read -r line || [ -n "$line" ]; do
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# trim whitespace
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line="$(printf '%s' "$line" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
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# skip blank/comment lines
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case "$line" in
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''|\#*) continue ;;
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esac
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@ -69,47 +140,41 @@ if [ "${ALLOW_MODE}" != "all" ]; then
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echo "Warning: allowed file not found: $src" >&2
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fi
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done
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}
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apply_templates() {
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if [ -f "${AUTOEXEC_TEMPLATE}" ]; then
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cp "${AUTOEXEC_TEMPLATE}" "${C_DRIVE}/AUTOEXEC.BAT"
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fi
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if [ -f "${CONFIG_TEMPLATE}" ]; then
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cp "${CONFIG_TEMPLATE}" "${C_DRIVE}/CONFIG.SYS"
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fi
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}
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if needs_install; then
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stage_initial_install
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fi
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# Optional: create an AUTOEXEC.BAT and CONFIG.SYS or other DOS boot files
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autoexec_path="${C_DRIVE}/AUTOEXEC.BAT"
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config_path="${C_DRIVE}/CONFIG.SYS"
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generate_dosemurc "c"
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if [ -f "${AUTOEXEC_TEMPLATE}" ]; then
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cp "${AUTOEXEC_TEMPLATE}" "${autoexec_path}"
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else
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cat > "${autoexec_path}" <<'EOF'
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@echo off
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prompt [DOS]$P$G
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echo Welcome to the containerized DOS environment.
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EOF
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fi
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sync_allowed_content
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apply_templates
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if [ "${ALLOW_MODE}" = "all" ]; then
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printf 'echo All repository programs are currently enabled.\r\n' >> "${autoexec_path}"
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elif [ ${#allowed_entries[@]} -gt 0 ]; then
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{
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printf 'echo Allowed programs:\r\n'
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for entry in "${allowed_entries[@]}"; do
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dos_entry="${entry//\//\\}"
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printf 'echo %s\r\n' "${dos_entry}"
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done
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} >> "${autoexec_path}"
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else
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{
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printf 'echo No extra programs are currently enabled.\r\n'
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} >> "${autoexec_path}"
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fi
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if [ -f "${CONFIG_TEMPLATE}" ]; then
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cp "${CONFIG_TEMPLATE}" "${config_path}"
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fi
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# Drop privileges to dosuser if we were run as root (ssh will run as the user)
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# but in case sshd runs ForceCommand as root, we switch.
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if [ "$(id -u)" -eq 0 ]; then
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exec runuser -u dosuser -- dosemu -quiet -K "${C_DRIVE}"
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else
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# running as the user already
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exec dosemu -quiet -K "${C_DRIVE}"
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chown -R "${DOS_USER}:${DOS_USER}" "${DOSEMU_DIR}"
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fi
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if [ "${ALLOW_MODE}" = "all" ] && [ "${#allowed_entries[@]}" -gt 0 ]; then
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echo "All files in ${ALLOWED_REPO} are available on drive C:."
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elif [ "${#allowed_entries[@]}" -gt 0 ]; then
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echo "Allowlisted files copied to C: from ${ALLOWED_REPO}:"
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for entry in "${allowed_entries[@]}"; do
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echo " ${entry}"
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done
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fi
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if [ "$(id -u)" -eq 0 ]; then
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exec runuser -u "${DOS_USER}" -- dosemu "${DOSEMU_ARGS[@]}"
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else
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exec dosemu "${DOSEMU_ARGS[@]}"
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fi
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