#!/bin/zsh
# dirvish-diff.sh Michael Weber 20120212

setopt -e
zmodload -a zsh/stat stat

LATEST=/backup/lore/latest
PREV=$(dirname $LATEST)
PREV=$PREV/$(ls -1 $PREV | grep -v "^dirvish\|latest$" | tail -1)
ACTION=$(basename $PREV)_$(basename $LATEST)
TARBALL=/backup/lore_$ACTION.tar.bz2
[ -e $TARBALL ] && { echo $TARBALL exists ; exit -1 }

echo "# $ACTION"

RMF=$(mktemp)
cd $PREV
for f in **/* ; do
	[ -e $PREV/$f ] && continue
	echo rm -v $f
done | tee $RMF

cd $LATEST
for f in tree/**/*(.) ; do
	stat -H src "$PREV/$f" 2>/dev/null \
		&& stat -H tgt "$f" \
		&& (( $src[inode] == $tgt[inode] )) \
		&& continue
	echo $f
done | tar cvf $TARBALL \
	--transform "s:^${RMF/\//}\$:$ACTION-removed:" \
	--show-transformed-names \
	--use-compress-program /usr/bin/pbzip2 \
	$RMF -T -
rm -v $RMF