From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Sixt <j.sixt@viscovery.net>
Subject: Re: Making custom git-remove-tree command
Date: Thu, 04 Feb 2010 10:55:17 +0100
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To: Teemu Likonen <tlikonen@iki.fi>
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Teemu Likonen schrieb:
> I'm doing a script named git-remove-tree which removes the working tree
> known to Git. It doesn't touch untracked files; it only deletes
> directories if they are empty. The script seems to work, but because I'm
> not very good at Git plumbing and there can be some corner cases which I
> don't know about, I'd appreciate if more experienced users would have a
> look. Is the following script safe?
> 
> 
> #!/bin/sh
> # git-remove-tree
> 
> is_wt=$(git rev-parse --is-inside-work-tree)
> if [ "$is_wt" = false ]; then
> 	echo "You must run this inside a working tree."
> 	exit 1
> elif [ -z "$is_wt" ]; then
> 	exit 1
> fi
> 
> top=$(git rev-parse --show-toplevel)
> cd "$top" || {
> 	echo "Can't go to top-level directory $top"
> 	exit 1
> }
> 
> git ls-tree --name-only -r -z HEAD | xargs -0r -- sh -c '
> for f in "$@"; do
> 	rm -f -- "$f"
> 	d=$(dirname -- "$f")
> 	[ "$d" = . ] || rmdir -p -- "$d" 2>/dev/null
> done' dollar0_argument

I think you should be able to reduce all of this to just

git read-tree --index-output=/tmp/empty.index -m -u \
	4b825dc642cb6eb9a060e54bf8d69288fbee4904 # empty tree
rm -f /tmp/empty.index

(with the usual caveats about temporary files).

> 
> echo 'Use "git reset --hard HEAD" to populate the working tree again.'

-- Hannes