snapshot

#!/bin/bash

set -e

STAMP=$(date "+%Y-%m-%dT%H:%M:%S")
DEST=/media/ed/hitachi
MACHINE=$(uname -n)
TARGET=$DEST/$MACHINE

[ -d $TARGET ] || (
    mkdir $TARGET
    mkdir $TARGET/0
    ln -s ../0 $TARGET/current
)

[ -L $TARGET/current ] || (
    echo Target directory $TARGET/current doesn\'t exist or isn\'t a symlink
    false
)

for DIR in home etc usr/local
do
    mkdir -p $TARGET/incomplete-$STAMP/$DIR
    rsync -axv --link-dest=$TARGET/current/$DIR/ /$DIR/ $TARGET/incomplete-$STAMP/$DIR/
done

mv $TARGET/incomplete-$STAMP $TARGET/back-$STAMP
rm -f $TARGET/current
ln -s back-$STAMP $TARGET/current
ls -l $TARGET
df -h $DEST
umount $DEST