The file 'chefignore.go' is a customized version of https://code.google.com/p/go/source/browse/src/pkg/path/match.go which is licensed under a BSD-style license. See the file header and/or the GO-LICENSE file for more info.
The rest of the package is licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0