Continued work on backup script, methodology

deploy/backup/mount_synology_cifs.example.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env sh
+set -eu
+
+# Example only. Copy to a local script and replace placeholder values.
+# Do NOT commit secrets.
+
+SHARE="//nas-host-or-ip/share-name"
+MOUNT_POINT="/mnt/nas-backups"
+CREDENTIALS_FILE="/etc/samba/credentials/nas-share-credentials"
+USERNAME="replace-with-nas-user"
+PASSWORD="replace-with-nas-password"
+
+if [ "${USERNAME}" = "replace-with-nas-user" ] || [ "${PASSWORD}" = "replace-with-nas-password" ]; then
+  echo "Edit USERNAME and PASSWORD placeholders before running this script."
+  exit 1
+fi
+
+mkdir -p "${MOUNT_POINT}"
+mkdir -p "$(dirname "${CREDENTIALS_FILE}")"
+
+cat > "${CREDENTIALS_FILE}" <<'EOF'
+username=__USERNAME__
+password=__PASSWORD__
+EOF
+sed -i "s|__USERNAME__|${USERNAME}|g" "${CREDENTIALS_FILE}"
+sed -i "s|__PASSWORD__|${PASSWORD}|g" "${CREDENTIALS_FILE}"
+chmod 600 "${CREDENTIALS_FILE}"
+
+mount -t cifs "${SHARE}" "${MOUNT_POINT}" \
+  -o "credentials=${CREDENTIALS_FILE},vers=3.0,iocharset=utf8,uid=0,gid=0,file_mode=0600,dir_mode=0700"
+
+echo ""
+echo "Mounted ${SHARE} at ${MOUNT_POINT}"
+echo ""
+echo "To persist across reboot, add this line to /etc/fstab:"
+echo "${SHARE} ${MOUNT_POINT} cifs credentials=${CREDENTIALS_FILE},vers=3.0,iocharset=utf8,uid=0,gid=0,file_mode=0600,dir_mode=0700,_netdev,nofail,x-systemd.automount 0 0"