git rebase --abort: always restore the right commit

Previously, --abort would end by git resetting to ORIG_HEAD, but some
commands, such as git reset --hard (which happened in git rebase --skip,
but could just as well be typed by the user), would have already modified
ORIG_HEAD.

Just use the orig-head we store in $dotest instead.

[jc: cherry-picked from 48411d and 4947cf9 on 'master']

Signed-off-by: Mike Hommey <mh@glandium.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-rebase.sh

@@ -208,16 +208,15 @@ do
 		if test -d "$dotest"
 		then
 			move_to_original_branch
-			rm -r "$dotest"
 		elif test -d .dotest
 		then
 			dotest=.dotest
 			move_to_original_branch
-			rm -r .dotest
 		else
 			die "No rebase in progress?"
 		fi
-		git reset --hard ORIG_HEAD
+		git reset --hard $(cat $dotest/orig-head)
+		rm -r "$dotest"
 		exit
 		;;
 	--onto)

t/t3407-rebase-abort.sh

@@ -0,0 +1,71 @@
+#!/bin/sh
+
+test_description='git rebase --abort tests'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	echo a > a &&
+	git add a &&
+	git commit -m a &&
+	git branch to-rebase &&
+
+	echo b > a &&
+	git commit -a -m b &&
+	echo c > a &&
+	git commit -a -m c &&
+
+	git checkout to-rebase &&
+	echo d > a &&
+	git commit -a -m "merge should fail on this" &&
+	echo e > a &&
+	git commit -a -m "merge should fail on this, too" &&
+	git branch pre-rebase
+'
+
+testrebase() {
+	type=$1
+	dotest=$2
+
+	test_expect_success "rebase$type --abort" '
+		# Clean up the state from the previous one
+		git reset --hard pre-rebase
+		test_must_fail git rebase'"$type"' master &&
+		test -d '$dotest' &&
+		git rebase --abort &&
+		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
+		test ! -d '$dotest'
+	'
+
+	test_expect_success "rebase$type --abort after --skip" '
+		# Clean up the state from the previous one
+		git reset --hard pre-rebase
+		test_must_fail git rebase'"$type"' master &&
+		test -d '$dotest' &&
+		test_must_fail git rebase --skip &&
+		test $(git rev-parse HEAD) = $(git rev-parse master) &&
+		git-rebase --abort &&
+		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
+		test ! -d '$dotest'
+	'
+
+	test_expect_success "rebase$type --abort after --continue" '
+		# Clean up the state from the previous one
+		git reset --hard pre-rebase
+		test_must_fail git rebase'"$type"' master &&
+		test -d '$dotest' &&
+		echo c > a &&
+		echo d >> a &&
+		git add a &&
+		test_must_fail git rebase --continue &&
+		test $(git rev-parse HEAD) != $(git rev-parse master) &&
+		git rebase --abort &&
+		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
+		test ! -d '$dotest'
+	'
+}
+
+testrebase "" .dotest
+testrebase " --merge" .git/.dotest-merge
+
+test_done