bash -c "set -euo pipefail MOUNT=/var/lib/postgresql DEV=$(python3 -c 'import os, subprocess; src=subprocess.check_output(["findmnt","-n","-o","SOURCE","/var/lib/postgresql"], text=True).strip(); print(os.path.realpath(src))') sudo umount -l "$MOUNT" || true sudo wipefs -a "$DEV" && sudo mkfs.ext4 -F "$DEV" sudo mount "$DEV" "$MOUNT""