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filesystem.go
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filesystem.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package utils
import (
"io"
"io/ioutil"
"os"
)
//go:generate go run github.com/golang/mock/mockgen -package mocks -destination mocks/file_mock.go github.com/DavinZhang/juju/cmd/containeragent/utils FileReaderWriter
// FileReaderWriter provides methods for reading a file or writing to a file.
type FileReaderWriter interface {
ReadFile(filename string) ([]byte, error)
WriteFile(filename string, data []byte, perm os.FileMode) error
Reader(filename string) (io.ReadCloser, error)
Writer(filename string, perm os.FileMode) (io.WriteCloser, error)
MkdirAll(path string, perm os.FileMode) error
Symlink(oldname, newname string) error
RemoveAll(path string) error
}
// NewFileReaderWriter returns a new FileReaderWriter.
func NewFileReaderWriter() FileReaderWriter {
return &fileReaderWriter{}
}
type fileReaderWriter struct{}
var _ FileReaderWriter = (*fileReaderWriter)(nil)
func (fileReaderWriter) ReadFile(filename string) ([]byte, error) {
return ioutil.ReadFile(filename)
}
func (fileReaderWriter) WriteFile(filename string, data []byte, perm os.FileMode) error {
return ioutil.WriteFile(filename, data, perm)
}
func (fileReaderWriter) MkdirAll(path string, perm os.FileMode) error {
return os.MkdirAll(path, perm)
}
func (fileReaderWriter) Symlink(oldname, newname string) error {
return os.Symlink(oldname, newname)
}
func (fileReaderWriter) Reader(filename string) (io.ReadCloser, error) {
return os.OpenFile(filename, os.O_RDONLY, 0)
}
func (fileReaderWriter) Writer(filename string, perm os.FileMode) (io.WriteCloser, error) {
return os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, perm)
}
func (fileReaderWriter) RemoveAll(path string) error {
return os.RemoveAll(path)
}