[PATCH v2 17/20] refs: add an update_ref_oid function.

[brian m. carlson]

Several places around the codebase want to pass update_ref data from
struct object_id, but update_ref may also be passed NULL pointers.
Instead of checking and dereferencing in every caller, create an
update_ref_oid which wraps update_ref and provides this functionality.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 refs.c | 8 ++++++++
 refs.h | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/refs.c b/refs.c
index b4e7cac7..f567a78e 100644
--- a/refs.c
+++ b/refs.c
@@ -858,6 +858,14 @@ int ref_transaction_verify(struct ref_transaction 
*transaction,
                                      flags, NULL, err);
 }
 
+int update_ref_oid(const char *msg, const char *refname,
+              const struct object_id *new_oid, const struct object_id *old_oid,
+              unsigned int flags, enum action_on_err onerr)
+{
+       return update_ref(msg, refname, new_oid ? new_oid->hash : NULL,
+               old_oid ? old_oid->hash : NULL, flags, onerr);
+}
+
 int update_ref(const char *msg, const char *refname,
               const unsigned char *new_sha1, const unsigned char *old_sha1,
               unsigned int flags, enum action_on_err onerr)
diff --git a/refs.h b/refs.h
index 1b020437..7a77f3ef 100644
--- a/refs.h
+++ b/refs.h
@@ -477,6 +477,9 @@ void ref_transaction_free(struct ref_transaction 
*transaction);
 int update_ref(const char *msg, const char *refname,
               const unsigned char *new_sha1, const unsigned char *old_sha1,
               unsigned int flags, enum action_on_err onerr);
+int update_ref_oid(const char *msg, const char *refname,
+              const struct object_id *new_oid, const struct object_id *old_oid,
+              unsigned int flags, enum action_on_err onerr);
 
 int parse_hide_refs_config(const char *var, const char *value, const char *);