update-ref: use err argument to get error from ref_transaction_commit

Call ref_transaction_commit with QUIET_ON_ERR and use the strbuf that is
returned to print a log message if/after the transaction fails.

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Michael Haggerty <mhagger@alum.mit.edu>

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 22617afb0aff95bfd923ac3873dfbd0f4faa29a9..aec9004207d3d94cbd51f9590d50d500ef4ca05f 100644 (file)
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -342,6 +342,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
        const char *refname, *oldval, *msg = NULL;
        unsigned char sha1[20], oldsha1[20];
        int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
+       struct strbuf err = STRBUF_INIT;
        struct option options[] = {
                OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
                OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
@@ -359,18 +360,17 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
                die("Refusing to perform update with empty message.");
 
        if (read_stdin) {
-               int ret;
                transaction = ref_transaction_begin();
-
                if (delete || no_deref || argc > 0)
                        usage_with_options(git_update_ref_usage, options);
                if (end_null)
                        line_termination = '\0';
                update_refs_stdin();
-               ret = ref_transaction_commit(transaction, msg, NULL,
-                                            UPDATE_REFS_DIE_ON_ERR);
+               if (ref_transaction_commit(transaction, msg, &err,
+                                          UPDATE_REFS_QUIET_ON_ERR))
+                       die("%s", err.buf);
                ref_transaction_free(transaction);
-               return ret;
+               return 0;
        }
 
        if (end_null)