[PATCH v4 03/27] refs.c: add a strbuf argument to ref_transaction_commit for error logging

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Add a strbuf argument to _commit so that we can pass an error string back to
the caller. So that we can do error logging from the caller instead of from
_commit.

Longer term plan is to first convert all callers to use onerr==QUIET_ON_ERR
and craft any log messages from the callers themselves and finally remove the
onerr argument completely.

Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
 builtin/update-ref.c | 2 +-
 refs.c               | 6 +++++-
 refs.h               | 5 ++++-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 405267f..aaa06aa 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -367,7 +367,7 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
 		if (end_null)
 			line_termination = '\0';
 		update_refs_stdin();
-		ret = ref_transaction_commit(transaction, msg,
+		ret = ref_transaction_commit(transaction, msg, NULL,
 					     UPDATE_REFS_DIE_ON_ERR);
 		return ret;
 	}
diff --git a/refs.c b/refs.c
index 2d83ef6..64e8feb 100644
--- a/refs.c
+++ b/refs.c
@@ -3414,7 +3414,8 @@ static int ref_update_reject_duplicates(struct ref_update **updates, int n,
 }
 
 int ref_transaction_commit(struct ref_transaction *transaction,
-			   const char *msg, enum action_on_err onerr)
+			   const char *msg, struct strbuf *err,
+			   enum action_on_err onerr)
 {
 	int ret = 0, delnum = 0, i;
 	const char **delnames;
@@ -3443,6 +3444,9 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 					       update->flags,
 					       &update->type, onerr);
 		if (!update->lock) {
+			if (err)
+				strbuf_addf(err ,"Cannot lock the ref '%s'.",
+					    update->refname);
 			ret = 1;
 			goto cleanup;
 		}
diff --git a/refs.h b/refs.h
index 892c5b6..ff87e14 100644
--- a/refs.h
+++ b/refs.h
@@ -268,9 +268,12 @@ void ref_transaction_delete(struct ref_transaction *transaction,
  * Commit all of the changes that have been queued in transaction, as
  * atomically as possible.  Return a nonzero value if there is a
  * problem.  The ref_transaction is freed by this function.
+ * If err is non-NULL we will add an error string to it to explain why
+ * the transaction failed.
  */
 int ref_transaction_commit(struct ref_transaction *transaction,
-			   const char *msg, enum action_on_err onerr);
+			   const char *msg, struct strbuf *err,
+			   enum action_on_err onerr);
 
 /** Lock a ref and then write its file */
 int update_ref(const char *action, const char *refname,
-- 
1.9.1.528.g98b8868.dirty

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