List hardlinks on HFS volumes

This one goes out to all of you mac users out there.

I recently made a little hack hardlinks that takes a path (or inode) of a hardlinked file and lists the paths of all of its clones (including its own), provided it lives on an HFS volume. Usage is simple:

sudo hardlinks path

or

sudo hardlinks -c inode

You need to have the hfsdebug-lite binary Amit Singh provides installed for it to work, and if you're on a modern mac, you need to install the Rosetta tools from your MacOS X install disk to get hfsdebug to run. (That sudo is needed for hfsdebug to access the raw device of the volume -- after that, hfsdebug drops privileges to the nobody user.)

Source code:

	#! /bin/zsh
	# get hfsdebug-lite at http://www.osxbook.com/software/hfsdebug/
	parse-hfsdebug-path () { sed -n '/^ path /s/^.*://p' }
	parse-hfsdebug-prev () { sed -n '/^ ownerID /s/^.* = \([0-9]*\).*/\1/p' }
	parse-hfsdebug-next () { sed -n '/^ groupID /s/^.* = \([0-9]*\).*/\1/p' }
	hardlinks () {
	hfsdebug=$(whence hfsdebug-lite || whence hfsdebug)
	stdout=$($hfsdebug "$@")
	parse-hfsdebug-path <<<$stdout
	prev=$(parse-hfsdebug-prev <<<$stdout)
	next=$(parse-hfsdebug-next <<<$stdout)
	while [[ "$prev" != "0" ]] ; do
	stdout=$($hfsdebug -c $prev)
	parse-hfsdebug-path <<<$stdout
	prev=$(parse-hfsdebug-prev <<<$stdout)
	done
	while [[ "$next" != "0" ]] ; do
	stdout=$($hfsdebug -c $next)
	parse-hfsdebug-path <<<$stdout
	next=$(parse-hfsdebug-next <<<$stdout)
	done
	}
	hardlinks "$@"

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