check for file change in subtree

[MaD dUCK <madduck@madduck.net>]

hey, wondering if anyone can help me out... not using anything but
scripting methods, how could i check a file system subtree for
changes? i need "immediate rsync", so ideally the script
"trigger-on-change" would operate like:

while true; do
  trigger-on-change ~/data
  # trigger-on-change returns only if there is a change to a file, a
  # new file, or a file deleted in the subtree rooted at ~/data.
  rsync -avzutC -e ssh --progress --delete ~/data/ $dest
done

any ideas?

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