odb: accept an oid type in options

Allow the object database to take an oid type that it supports.  This
oid type will be used to validate the objects that the backends provide.

2 files changed, 8 insertions, 0 deletions

diff --git a/include/git2/odb.h b/include/git2/odb.h
index 12b5fc730..0952a1be0 100644
--- a/include/git2/odb.h
+++ b/include/git2/odb.h
@@ -41,6 +41,12 @@ typedef int GIT_CALLBACK(git_odb_foreach_cb)(const git_oid *id, void *payload);
 /** Options for configuring a loose object backend. */
 typedef struct {
 	unsigned int version; /**< version for the struct */
+
+	/**
+	 * Type of object IDs to use for this object database, or
+	 * 0 for default (currently SHA1).
+	 */
+	git_oid_t oid_type;
 } git_odb_options;
 
 /* The current version of the diff options structure */
diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
index 5ad777b17..d93ac7348 100644
--- a/include/git2/odb_backend.h
+++ b/include/git2/odb_backend.h
@@ -87,6 +87,8 @@ struct git_odb_stream {
 	unsigned int mode;
 	void *hash_ctx;
 
+	git_oid_t oid_type;
+
 	git_object_size_t declared_size;
 	git_object_size_t received_bytes;