* not exist before update.
*/
struct ref_update {
+
/*
* If (flags & REF_HAVE_NEW), set the reference to this value:
*/
unsigned char new_sha1[20];
+
/*
* If (flags & REF_HAVE_OLD), check that the reference
* previously had this value:
*/
unsigned char old_sha1[20];
+
/*
* One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,
* REF_DELETING, REF_ISPRUNING, REF_LOG_ONLY, and
* REF_UPDATE_VIA_HEAD:
*/
unsigned int flags;
+
struct ref_lock *lock;
unsigned int type;
char *msg;
+
+ /*
+ * If this ref_update was split off of a symref update via
+ * split_symref_update(), then this member points at that
+ * update. This is used for two purposes:
+ * 1. When reporting errors, we report the refname under which
+ * the update was originally requested.
+ * 2. When we read the old value of this reference, we
+ * propagate it back to its parent update for recording in
+ * the latter's reflog.
+ */
+ struct ref_update *parent_update;
+
const char refname[FLEX_ARRAY];
};