From c68998f5b5f43717a27da82fac08a76d6588bae7 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@osdl.org>
Date: Sun, 14 May 2006 11:20:37 -0700
Subject: [PATCH] Simplify "git reset --hard"

Now that the one-way merge strategy does the right thing wrt files that do
not exist in the result, just remove all the random crud we did in "git
reset" to do this all by hand.

Instead, just pass in "-u" to git-read-tree when we do a hard reset, and
depend on git-read-tree to update the working tree appropriately.

This basically means that git reset turns into

	# Always update the HEAD ref
	git update-ref HEAD "$rev"

	case "--soft"
		# do nothing to index/working tree
	case "--hard"
		# read index _and_ update working tree
		git-read-tree --reset -u "$rev"
	case "--mixed"
		# update just index, report on working tree differences
		git-read-tree --reset "$rev"
		git-update-index --refresh

which is what it was always semantically doing, it just did it in a
rather strange way because it was written to not expect git-read-tree to
do anything to the working tree.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
 git-reset.sh | 50 ++++----------------------------------------------
 1 file changed, 4 insertions(+), 46 deletions(-)

diff --git a/git-reset.sh b/git-reset.sh
index 6cb073cb1..0ee3e3e15 100755
--- a/git-reset.sh
+++ b/git-reset.sh
@@ -6,6 +6,7 @@ USAGE='[--mixed | --soft | --hard]  [<commit-ish>]'
 tmp=${GIT_DIR}/reset.$$
 trap 'rm -f $tmp-*' 0 1 2 3 15
 
+update=
 reset_type=--mixed
 case "$1" in
 --mixed | --soft | --hard)
@@ -23,24 +24,7 @@ rev=$(git-rev-parse --verify $rev^0) || exit
 # behind before a hard reset, so that we can remove them.
 if test "$reset_type" = "--hard"
 then
-	{
-		git-ls-files --stage -z
-		git-rev-parse --verify HEAD 2>/dev/null &&
-		git-ls-tree -r -z HEAD
-	} | perl -e '
-	    use strict;
-	    my %seen;
-	    $/ = "\0";
-	    while (<>) {
-		chomp;
-		my ($info, $path) = split(/\t/, $_);
-		next if ($info =~ / tree /);
-		if (!$seen{$path}) {
-			$seen{$path} = 1;
-			print "$path\0";
-		}
-	    }
-	' >$tmp-exists
+	update=-u
 fi
 
 # Soft reset does not touch the index file nor the working tree
@@ -54,7 +38,7 @@ then
 		die "Cannot do a soft reset in the middle of a merge."
 	fi
 else
-	git-read-tree --reset "$rev" || exit
+	git-read-tree --reset $update "$rev" || exit
 fi
 
 # Any resets update HEAD to the head being switched to.
@@ -68,33 +52,7 @@ git-update-ref HEAD "$rev"
 
 case "$reset_type" in
 --hard )
-	# Hard reset matches the working tree to that of the tree
-	# being switched to.
-	git-checkout-index -f -u -q -a
-	git-ls-files --cached -z |
-	perl -e '
-		use strict;
-		my (%keep, $fh);
-		$/ = "\0";
-		while (<STDIN>) {
-			chomp;
-			$keep{$_} = 1;
-		}
-		open $fh, "<", $ARGV[0]
-			or die "cannot open $ARGV[0]";
-		while (<$fh>) {
-			chomp;
-			if (! exists $keep{$_}) {
-				# it is ok if this fails -- it may already
-				# have been culled by checkout-index.
-				unlink $_;
-				while (s|/[^/]*$||) {
-					rmdir($_) or last;
-				}
-			}
-		}
-	' $tmp-exists
-	;;
+	;; # Nothing else to do
 --soft )
 	;; # Nothing else to do
 --mixed )
-- 
2.30.2