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diff --git a/vendor/github.com/spf13/afero/afero.go b/vendor/github.com/spf13/afero/afero.go
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+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+// Copyright 2013 tsuru authors. All rights reserved.
+//
+// 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 provides types and methods for interacting with the filesystem,
+// as an abstraction layer.
+
+// Afero also provides a few implementations that are mostly interoperable. One that
+// uses the operating system filesystem, one that uses memory to store files
+// (cross platform) and an interface that should be implemented if you want to
+// provide your own filesystem.
+
+package afero
+
+import (
+	"errors"
+	"io"
+	"os"
+	"time"
+)
+
+type Afero struct {
+	Fs
+}
+
+// File represents a file in the filesystem.
+type File interface {
+	io.Closer
+	io.Reader
+	io.ReaderAt
+	io.Seeker
+	io.Writer
+	io.WriterAt
+
+	Name() string
+	Readdir(count int) ([]os.FileInfo, error)
+	Readdirnames(n int) ([]string, error)
+	Stat() (os.FileInfo, error)
+	Sync() error
+	Truncate(size int64) error
+	WriteString(s string) (ret int, err error)
+}
+
+// Fs is the filesystem interface.
+//
+// Any simulated or real filesystem should implement this interface.
+type Fs interface {
+	// Create creates a file in the filesystem, returning the file and an
+	// error, if any happens.
+	Create(name string) (File, error)
+
+	// Mkdir creates a directory in the filesystem, return an error if any
+	// happens.
+	Mkdir(name string, perm os.FileMode) error
+
+	// MkdirAll creates a directory path and all parents that does not exist
+	// yet.
+	MkdirAll(path string, perm os.FileMode) error
+
+	// Open opens a file, returning it or an error, if any happens.
+	Open(name string) (File, error)
+
+	// OpenFile opens a file using the given flags and the given mode.
+	OpenFile(name string, flag int, perm os.FileMode) (File, error)
+
+	// Remove removes a file identified by name, returning an error, if any
+	// happens.
+	Remove(name string) error
+
+	// RemoveAll removes a directory path and all any children it contains. It
+	// does not fail if the path does not exist (return nil).
+	RemoveAll(path string) error
+
+	// Rename renames a file.
+	Rename(oldname, newname string) error
+
+	// Stat returns a FileInfo describing the named file, or an error, if any
+	// happens.
+	Stat(name string) (os.FileInfo, error)
+
+	// The name of this FileSystem
+	Name() string
+
+	//Chmod changes the mode of the named file to mode.
+	Chmod(name string, mode os.FileMode) error
+
+	//Chtimes changes the access and modification times of the named file
+	Chtimes(name string, atime time.Time, mtime time.Time) error
+}
+
+var (
+	ErrFileClosed        = errors.New("File is closed")
+	ErrOutOfRange        = errors.New("Out of range")
+	ErrTooLarge          = errors.New("Too large")
+	ErrFileNotFound      = os.ErrNotExist
+	ErrFileExists        = os.ErrExist
+	ErrDestinationExists = os.ErrExist
+)