ref/refname: Add refname validation

1 files changed, 14 insertions, 0 deletions

diff --git a/ref/refname/errors.go b/ref/refname/errors.go
new file mode 100644
index 00000000..e39bc73b
--- /dev/null
+++ b/ref/refname/errors.go
@@ -0,0 +1,14 @@
+package refname
+
+import "fmt"
+
+// NameError reports one invalid reference name.
+type NameError struct {
+	Name   string
+	Reason string
+}
+
+// Error implements error.
+func (err *NameError) Error() string {
+	return fmt.Sprintf("ref: invalid name %q: %s", err.Name, err.Reason)
+}