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-rw-r--r--builtin/merge.c8
-rwxr-xr-xt/t7605-merge-resolve.sh6
2 files changed, 13 insertions, 1 deletions
diff --git a/builtin/merge.c b/builtin/merge.c
index 1ec44f0c1..b555a1bf9 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -822,6 +822,14 @@ static int merge_trivial(struct commit *head, struct commit_list *remoteheads)
{
unsigned char result_tree[20], result_commit[20];
struct commit_list *parents, **pptr = &parents;
+ static struct lock_file lock;
+
+ hold_locked_index(&lock, 1);
+ refresh_cache(REFRESH_QUIET);
+ if (active_cache_changed &&
+ write_locked_index(&the_index, &lock, COMMIT_LOCK))
+ return error(_("Unable to write index."));
+ rollback_lock_file(&lock);
write_tree_trivial(result_tree);
printf(_("Wonderful.\n"));
diff --git a/t/t7605-merge-resolve.sh b/t/t7605-merge-resolve.sh
index 0cb9d11f2..5d56c3854 100755
--- a/t/t7605-merge-resolve.sh
+++ b/t/t7605-merge-resolve.sh
@@ -27,7 +27,7 @@ test_expect_success 'setup' '
git tag c3
'
-test_expect_success 'merge c1 to c2' '
+merge_c1_to_c2_cmds='
git reset --hard c1 &&
git merge -s resolve c2 &&
test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
@@ -41,6 +41,10 @@ test_expect_success 'merge c1 to c2' '
test 3 = $(git ls-files | wc -l)
'
+test_expect_success 'merge c1 to c2' "$merge_c1_to_c2_cmds"
+
+test_expect_success 'merge c1 to c2, again' "$merge_c1_to_c2_cmds"
+
test_expect_success 'merge c2 to c3 (fails)' '
git reset --hard c2 &&
test_must_fail git merge -s resolve c3