unpack-trees: preserve the index file version of original

Otherwise "git checkout $other_branch" (or even "git checkout HEAD")
would end up writing the index out in the default format.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/unpack-trees.c b/unpack-trees.c
index 7c9ecf665d062d79e9208875d9bf2577e98f4fb2..2a037d6a423a7ab9d55036972e52dfad88d369b4 100644 (file)
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1020,6 +1020,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
        o->result.initialized = 1;
        o->result.timestamp.sec = o->src_index->timestamp.sec;
        o->result.timestamp.nsec = o->src_index->timestamp.nsec;
+       o->result.version = o->src_index->version;
        o->merge_size = len;
        mark_all_ce_unused(o->src_index);