[PATCH v2] reset: optionally setup worktree and refresh index on --mixed

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Refreshing index requires work tree. So we have to options: always set
up work tree (and refuse to reset if failing to do so), or make
refreshing index optional.

As refreshing index is not the main task, it makes more sense to make
it optional.

Reported-by: Patrick Palka <patrick@parcs.ath.cx>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/reset.c  |  7 ++++---
 t/t7102-reset.sh | 11 +++++++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/builtin/reset.c b/builtin/reset.c
index 6004803..a991344 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -320,7 +320,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 	if (reset_type == NONE)
 		reset_type = MIXED; /* by default */
 
-	if (reset_type != SOFT && reset_type != MIXED)
+	if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
 		setup_work_tree();
 
 	if (reset_type == MIXED && is_bare_repository())
@@ -340,8 +340,9 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 			int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
 			if (read_from_tree(&pathspec, sha1))
 				return 1;
-			refresh_index(&the_index, flags, NULL, NULL,
-				      _("Unstaged changes after reset:"));
+			if (get_git_work_tree())
+				refresh_index(&the_index, flags, NULL, NULL,
+					      _("Unstaged changes after reset:"));
 		} else {
 			int err = reset_index(sha1, reset_type, quiet);
 			if (reset_type == KEEP && !err)
diff --git a/t/t7102-reset.sh b/t/t7102-reset.sh
index 8d4b50d..ee117e2 100755
--- a/t/t7102-reset.sh
+++ b/t/t7102-reset.sh
@@ -535,4 +535,15 @@ test_expect_success 'reset with paths accepts tree' '
 	git diff HEAD --exit-code
 '
 
+test_expect_success 'reset --mixed sets up work tree' '
+	git init mixed_worktree &&
+	(
+		cd mixed_worktree &&
+		test_commit dummy
+	) &&
+	: >expect &&
+	git --git-dir=mixed_worktree/.git --work-tree=mixed_worktree reset >actual &&
+	test_cmp expect actual
+'
+
 test_done
-- 
1.8.5.2.240.g8478abd