[PATCH v20 17/48] update-ref: use err argument to get error from ref_transaction_commit

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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@xxxxxxxxx>
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
 builtin/update-ref.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 22617af..aec9004 100644
--- 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)
-- 
2.0.0.420.g181e020.dirty

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