[PATCH] stash: clean untracked files before reset

[Nicolas Morey-Chaisemartin <nicolas@morey-chaisemartin.com>]

If calling git stash -u on a repo that contains a file that is not
ignored any more due to a current modification of the gitignore file,
this file is stashed but not remove from the working tree.
This is due to git-stash first doing a reset --hard which clears the
.gitignore file modification and the call git clean, leaving the file
untouched.
This causes git stash pop to fail due to the file existing.

This patch simply switches the order between cleaning and resetting
and adds a test for this usecase.

Signed-off-by: Nicolas Morey-Chaisemartin <nicolas@morey-chaisemartin.com>
Reported-by: Sam Partington <sam@whiteoctober.co.uk>
---
 git-stash.sh                       | 11 ++++++-----
 t/t3905-stash-include-untracked.sh | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/git-stash.sh b/git-stash.sh
index 9b6c2da7b..39083b4d9 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -300,6 +300,12 @@ push_stash () {
 
 	if test -z "$patch_mode"
 	then
+		test "$untracked" = "all" && CLEAN_X_OPTION=-x || CLEAN_X_OPTION=
+		if test -n "$untracked"
+		then
+			git clean --force --quiet -d $CLEAN_X_OPTION -- "$@"
+		fi
+
 		if test $# != 0
 		then
 			git reset -q -- "$@"
@@ -309,11 +315,6 @@ push_stash () {
 		else
 			git reset --hard -q
 		fi
-		test "$untracked" = "all" && CLEAN_X_OPTION=-x || CLEAN_X_OPTION=
-		if test -n "$untracked"
-		then
-			git clean --force --quiet -d $CLEAN_X_OPTION -- "$@"
-		fi
 
 		if test "$keep_index" = "t" && test -n "$i_tree"
 		then
diff --git a/t/t3905-stash-include-untracked.sh b/t/t3905-stash-include-untracked.sh
index 193adc7b6..c1f84d3d5 100755
--- a/t/t3905-stash-include-untracked.sh
+++ b/t/t3905-stash-include-untracked.sh
@@ -211,4 +211,22 @@ test_expect_success 'stash push with $IFS character' '
 	test_path_is_file bar
 '
 
+cat > .gitignore <<EOF
+ignored
+ignored.d/*
+EOF
+
+test_expect_success 'stash previously ignored file' '
+which git &&
+	git reset HEAD &&
+	git add .gitignore &&
+	git commit -m "Add .gitignore" && 
+	>ignored.d/foo &&
+	echo "!ignored.d/foo" >> .gitignore &&
+	git stash save --include-untracked &&
+	test_path_is_missing ignored.d/foo &&
+	git stash pop &&
+	test_path_is_file ignored.d/foo
+'
+
 test_done
-- 
2.14.0.1.gd9597ce13