mirror of https://github.com/docker/cli.git
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package driver
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import (
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"io"
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"io/ioutil"
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"os"
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"sort"
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)
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// ReadFile works the same as ioutil.ReadFile with the Driver abstraction
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func ReadFile(r Driver, filename string) ([]byte, error) {
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f, err := r.Open(filename)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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data, err := ioutil.ReadAll(f)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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// WriteFile works the same as ioutil.WriteFile with the Driver abstraction
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func WriteFile(r Driver, filename string, data []byte, perm os.FileMode) error {
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f, err := r.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
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if err != nil {
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return err
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}
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defer f.Close()
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n, err := f.Write(data)
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if err != nil {
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return err
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} else if n != len(data) {
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return io.ErrShortWrite
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}
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return nil
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}
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// ReadDir works the same as ioutil.ReadDir with the Driver abstraction
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func ReadDir(r Driver, dirname string) ([]os.FileInfo, error) {
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f, err := r.Open(dirname)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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dirs, err := f.Readdir(-1)
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if err != nil {
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return nil, err
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}
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sort.Sort(fileInfos(dirs))
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return dirs, nil
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}
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// Simple implementation of the sort.Interface for os.FileInfo
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type fileInfos []os.FileInfo
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func (fis fileInfos) Len() int {
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return len(fis)
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}
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func (fis fileInfos) Less(i, j int) bool {
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return fis[i].Name() < fis[j].Name()
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}
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func (fis fileInfos) Swap(i, j int) {
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fis[i], fis[j] = fis[j], fis[i]
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}
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