#! /usr/bin/env bash # Remove a directory on a btrfs filesystem. Inside, subvolumes are removed # with btrfs subvolume delete and everything else with rm. # # Notes: # # 1. <dir> should not be a subvolume (use delete directly in this case). # # 2. Read-only subvolumes are changed to read-write before deleting. # usage="usage: $0 <dir>/" owd="$(pwd)" trap "{ cd '$owd'; exit 1; }" ERR set -o errtrace # Trap in functions. function info () { echo "$*" 1>&2; } function error () { info "$*"; exit 1; } dir="${1%/}" if [ -z "$dir" ]; then error "$usage" fi shopt -s nullglob dotglob function rm_dir () # <dir> { local dir="$1" local p for p in "$dir"/*; do if [ -d "$p" -a ! -L "$p" ]; then # See if this is a subvolume: btrfs subvolume list requires root # priviliges so we use the inode number which for subvolumes is always # 256. # if [ "$(stat --format=%i "$p")" -eq 256 ]; then rm_subvol "$p" else rm_dir "$p" fi else rm "$p" fi done rmdir "$dir" } function rm_subvol () # <dir> { local dir="$1" if [ "$(btrfs property get -ts "$dir" ro)" = "ro=true" ]; then btrfs property set -ts "$dir" ro false >/dev/null fi btrfs subvolume delete "$dir" >/dev/null } rm_dir "$dir"