index: make relative comparison use the checksum as wellcmn/index-checksum

This is used by the submodule in order to figure out if the index has
changed since it last read it. Using a timestamp is racy, so let's make
it use the checksum, just like we now do for reloading the index itself.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/submodule.h b/src/submodule.h
index a6182beca..7a9bf9c92 100644
--- a/src/submodule.h
+++ b/src/submodule.h
@@ -110,7 +110,7 @@ typedef struct {
 
 	/* cache invalidation data */
 	git_oid head_id;
-	git_futils_filestamp index_stamp;
+	git_oid index_checksum;
 	git_buf gitmodules_path;
 	git_futils_filestamp gitmodules_stamp;
 	git_futils_filestamp config_stamp;