// Copyright © 2018 Steve Francia <spf@spf13.com>. // // 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 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package afero import ( "errors" ) // Symlinker is an optional interface in Afero. It is only implemented by the // filesystems saying so. // It indicates support for 3 symlink related interfaces that implement the // behaviors of the os methods: // - Lstat // - Symlink, and // - Readlink type Symlinker interface { Lstater Linker LinkReader } // Linker is an optional interface in Afero. It is only implemented by the // filesystems saying so. // It will call Symlink if the filesystem itself is, or it delegates to, the os filesystem, // or the filesystem otherwise supports Symlink's. type Linker interface { SymlinkIfPossible(oldname, newname string) error } // ErrNoSymlink is the error that will be wrapped in an os.LinkError if a file system // does not support Symlink's either directly or through its delegated filesystem. // As expressed by support for the Linker interface. var ErrNoSymlink = errors.New("symlink not supported") // LinkReader is an optional interface in Afero. It is only implemented by the // filesystems saying so. type LinkReader interface { ReadlinkIfPossible(name string) (string, error) } // ErrNoReadlink is the error that will be wrapped in an os.Path if a file system // does not support the readlink operation either directly or through its delegated filesystem. // As expressed by support for the LinkReader interface. var ErrNoReadlink = errors.New("readlink not supported")