[PATCH 04/31] refs.c: add a new update_type field to ref_update

[Ronnie Sahlberg <sahlberg@google.com>]

Add a field that describes what type of update this refers to. For now
the only type is UPDATE_SHA1 but we will soon add more types.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
---
 refs.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/refs.c b/refs.c
index 6785fa6..018062d 100644
--- a/refs.c
+++ b/refs.c
@@ -3235,6 +3235,10 @@ int for_each_reflog(each_ref_fn fn, void *cb_data)
 	return retval;
 }
 
+enum transaction_update_type {
+       UPDATE_SHA1 = 0,
+};
+
 /**
  * Information needed for a single ref update.  Set new_sha1 to the
  * new value or to zero to delete the ref.  To check the old value
@@ -3242,6 +3246,7 @@ int for_each_reflog(each_ref_fn fn, void *cb_data)
  * value or to zero to ensure the ref does not exist before update.
  */
 struct ref_update {
+	enum transaction_update_type update_type;
 	unsigned char new_sha1[20];
 	unsigned char old_sha1[20];
 	int flags; /* REF_NODEREF? */
@@ -3301,12 +3306,14 @@ void transaction_rollback(struct ref_transaction *transaction)
 }
 
 static struct ref_update *add_update(struct ref_transaction *transaction,
-				     const char *refname)
+				     const char *refname,
+				     enum transaction_update_type update_type)
 {
 	size_t len = strlen(refname);
 	struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1);
 
 	strcpy((char *)update->refname, refname);
+	update->update_type = update_type;
 	ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
 	transaction->updates[transaction->nr++] = update;
 	return update;
@@ -3329,7 +3336,7 @@ int transaction_update_sha1(struct ref_transaction *transaction,
 	if (flags & REF_ISPACKONLY && !is_null_sha1(new_sha1))
 		die("BUG: REF_ISPACKONLY can not be used with updates");
 
-	update = add_update(transaction, refname);
+	update = add_update(transaction, refname, UPDATE_SHA1);
 	hashcpy(update->new_sha1, new_sha1);
 	update->flags = flags;
 	update->have_old = have_old;
-- 
2.0.0.rc3.506.g3739a35