From 3e73cc62c0d80fedd1fc612e256b5eb3f3068de4 Mon Sep 17 00:00:00 2001
From: Elijah Newren <newren@gmail.com>
Date: Thu, 27 Sep 2018 10:36:57 -0700
Subject: [PATCH] commit: fix erroneous BUG, 'multiple renames on the same
target? how?'
builtin/commit.c:prepare_to_commit() can call run_status() twice if
using the editor, including status, and the user attempts to record a
non-merge empty commit without explicit --allow-empty. If there is also
a rename involved as well (due to using 'git add -N'), then a BUG in
wt-status.c is triggered:
BUG: wt-status.c:476: multiple renames on the same target? how?
The reason we hit this bug is that both run_status() calls use the same
struct wt_status * (named s), and s->change is not freed between runs.
Changes are inserted into s with string_list_insert, which usually means
that the second run just recomputes all the same results and overwrites
what was computed the first time. However, ever since commit
176ea7479309 ("wt-status.c: handle worktree renames", 2017-12-27),
wt-status started checking for renames and copies but also added a
preventative check that d->rename_status wasn't already set and output a
BUG message if it was. The problem isn't that there are multiple rename
targets to a single path as the error implies, the problem is that 's'
is not freed/cleared between the two run_status() calls.
Ever since commit dc6b1d92ca9c ("wt-status: use settings from
git_diff_ui_config", 2018-05-04), which stopped hardcoding
DIFF_DETECT_RENAME and allowed users to ask for copy detection, this bug
has also been triggerable with a copy instead of a rename.
Fix the bug by clearing s->change. A better change might be to clean up
all of s between the two run_status() calls. A good first step towards
such a goal might be writing a function to free the necessary fields in
the wt_status * struct; a cursory glance at the code suggests all of its
allocated data is probably leaked. However, doing all that cleanup is a
bigger task for someone else interested to tackle; just fix the bug for
now.
Reported-by: Andrea Stacchiotti <andreastacchiotti@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
builtin/commit.c | 1 +
t/t7500-commit.sh | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/builtin/commit.c b/builtin/commit.c
index 0d9828e29e..83233ca1a5 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -872,6 +872,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
s->use_color = 0;
commitable = run_status(s->fp, index_file, prefix, 1, s);
s->use_color = saved_color_setting;
+ string_list_clear(&s->change, 1);
} else {
struct object_id oid;
const char *parent = "HEAD";
diff --git a/t/t7500-commit.sh b/t/t7500-commit.sh
index 170b4810e0..31ab608b67 100755
--- a/t/t7500-commit.sh
+++ b/t/t7500-commit.sh
@@ -359,4 +359,27 @@ test_expect_success 'new line found before status message in commit template' '
test_i18ncmp expected-template editor-input
'
+test_expect_success 'setup empty commit with unstaged rename and copy' '
+ test_create_repo unstaged_rename_and_copy &&
+ (
+ cd unstaged_rename_and_copy &&
+
+ echo content >orig &&
+ git add orig &&
+ test_commit orig &&
+
+ cp orig new_copy &&
+ mv orig new_rename &&
+ git add -N new_copy new_rename
+ )
+'
+
+test_expect_success 'check commit with unstaged rename and copy' '
+ (
+ cd unstaged_rename_and_copy &&
+
+ test_must_fail git -c diff.renames=copy commit
+ )
+'
+
test_done