repository: implement extensions.compatObjectFormat

Add a configuration option to enable updating and reading from
compatibility hash maps when git accesses the reposotiry.

Call the helper function repo_set_compat_hash_algo with the value
that compatObjectFormat is set to.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/setup.h b/setup.h
index 58fd2605dd..5d678ceb8c 100644
--- a/setup.h
+++ b/setup.h
@@ -86,6 +86,7 @@ struct repository_format {
 	int worktree_config;
 	int is_bare;
 	int hash_algo;
+	int compat_hash_algo;
 	int sparse_index;
 	char *work_tree;
 	struct string_list unknown_extensions;