multi: separate profiler config

lncfg/error.go

@@ -0,0 +1,25 @@
+package lncfg
+
+import "fmt"
+
+// UsageError is an error type that signals a problem with the supplied flags.
+type UsageError struct {
+	Err error
+}
+
+// Error returns the error string.
+//
+// NOTE: This is part of the error interface.
+func (u *UsageError) Error() string {
+	return u.Err.Error()
+}
+
+// Unwrap returns the underlying error.
+func (u *UsageError) Unwrap() error {
+	return u.Err
+}
+
+// mkErr creates a new error from a string.
+func mkErr(format string, args ...interface{}) error {
+	return fmt.Errorf(format, args...)
+}