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#! /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"
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