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-rw-r--r--builtin/update-ref.c2
-rw-r--r--refs.c6
-rw-r--r--refs.h5
3 files changed, 10 insertions, 3 deletions
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 1fd7a89..22617af 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);
ref_transaction_free(transaction);
return ret;
diff --git a/refs.c b/refs.c
index 1d6dece..db05602 100644
--- a/refs.c
+++ b/refs.c
@@ -3444,7 +3444,8 @@ 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;
@@ -3473,6 +3474,9 @@ 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 8c7f9c4..09d3564 100644
--- a/refs.h
+++ b/refs.h
@@ -269,9 +269,12 @@ 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.
+ * If err is non-NULL we will add an error string to it to explain why
+ * the transaction failed. The string does not end in newline.
*/
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);
/*
* Free an existing transaction and all associated data.