btrfs-diff

#!/bin/bash
_sdir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

usage() { echo $@ >&2; echo "Usage: $0 <older-snapshot> <newer-snapshot>" >&2; exit 1; }

[ $# -ge 2 ] || usage "Incorrect invocation";
SNAPSHOT_OLD=$1;
SNAPSHOT_NEW=$2;

[[ $(whoami) = "root" ]] || { sudo $0 "$@"; exit 0; }

[ -d $SNAPSHOT_OLD ] || usage "$SNAPSHOT_OLD does not exist";
[ -d $SNAPSHOT_NEW ] || usage "$SNAPSHOT_NEW does not exist";

shift
shift

btrfs send -q --no-data -p "$SNAPSHOT_OLD" "$SNAPSHOT_NEW" | sudo btrfs receive --dump