Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/read-tree.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builtin/read-tree.c b/builtin/read-tree.c
index 3204c62..e7e1c33 100644
--- a/builtin/read-tree.c
+++ b/builtin/read-tree.c
@@ -155,6 +155,15 @@ int cmd_read_tree(int argc, const char **argv, const char 
*unused_prefix)
        if (1 < opts.merge + opts.reset + prefix_set)
                die("Which one? -m, --reset, or --prefix?");
 
+       /*
+        * NEEDSWORK
+        *
+        * The old index should be read anyway even if we're going to
+        * destroy all index entries because we still need to preserve
+        * certain information such as index version or split-index
+        * mode.
+        */
+
        if (opts.reset || opts.merge || opts.prefix) {
                if (read_cache_unmerged() && (opts.prefix || opts.merge))
                        die("You need to resolve your current index first");
-- 
1.9.1.346.ga2b5940

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