Change ref_transaction_delete() to do basic error checking and return
non-zero of error. Update all callers to check the return for
ref_transaction_delete(). There are currently no conditions in _delete that
will return error but there will be in the future.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 builtin/update-ref.c |  5 +++--
 refs.c               | 15 ++++++++++-----
 refs.h               |  9 +++++----
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 3fab810..fc3512f 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -257,8 +257,9 @@ static const char *parse_cmd_delete(struct strbuf *input, 
const char *next)
        if (*next != line_termination)
                die("delete %s: extra input: %s", refname, next);
 
-       ref_transaction_delete(transaction, refname, old_sha1,
-                              update_flags, have_old);
+       if (ref_transaction_delete(transaction, refname, old_sha1,
+                                  update_flags, have_old))
+               die("failed transaction delete for %s", refname);
 
        update_flags = 0;
        free(refname);
diff --git a/refs.c b/refs.c
index df376fa..64e3d53 100644
--- a/refs.c
+++ b/refs.c
@@ -3381,19 +3381,24 @@ int ref_transaction_create(struct ref_transaction 
*transaction,
        return 0;
 }
 
-void ref_transaction_delete(struct ref_transaction *transaction,
-                           const char *refname,
-                           const unsigned char *old_sha1,
-                           int flags, int have_old)
+int ref_transaction_delete(struct ref_transaction *transaction,
+                          const char *refname,
+                          const unsigned char *old_sha1,
+                          int flags, int have_old)
 {
-       struct ref_update *update = add_update(transaction, refname);
+       struct ref_update *update;
 
+       if (have_old && !old_sha1)
+               die("have_old is true but old_sha1 is NULL");
+
+       update = add_update(transaction, refname);
        update->flags = flags;
        update->have_old = have_old;
        if (have_old) {
                assert(!is_null_sha1(old_sha1));
                hashcpy(update->old_sha1, old_sha1);
        }
+       return 0;
 }
 
 int update_ref(const char *action, const char *refname,
diff --git a/refs.h b/refs.h
index d4c068d..6026edf 100644
--- a/refs.h
+++ b/refs.h
@@ -266,11 +266,12 @@ int ref_transaction_create(struct ref_transaction 
*transaction,
  * Add a reference deletion to transaction.  If have_old is true, then
  * old_sha1 holds the value that the reference should have had before
  * the update (which must not be the null SHA-1).
+ * Function returns 0 on success and non-zero on failure.
  */
-void ref_transaction_delete(struct ref_transaction *transaction,
-                           const char *refname,
-                           const unsigned char *old_sha1,
-                           int flags, int have_old);
+int ref_transaction_delete(struct ref_transaction *transaction,
+                          const char *refname,
+                          const unsigned char *old_sha1,
+                          int flags, int have_old);
 
 /*
  * Commit all of the changes that have been queued in transaction, as
-- 
2.0.0.rc3.471.g2055d11.dirty

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