mirror of
https://github.com/ceph/ceph-csi.git
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123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
/*
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Copyright 2018 The Kubernetes 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 fs
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import (
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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)
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var _ FileSystem = realFS{}
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// realFS implements FileSystem using the local filesystem.
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type realFS struct{}
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// MakeRealFS makes an instance of realFS.
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func MakeRealFS() FileSystem {
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return realFS{}
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}
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// Create delegates to os.Create.
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func (realFS) Create(name string) (File, error) { return os.Create(name) }
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// Mkdir delegates to os.Mkdir.
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func (realFS) Mkdir(name string) error {
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return os.Mkdir(name, 0777|os.ModeDir)
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}
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// MkdirAll delegates to os.MkdirAll.
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func (realFS) MkdirAll(name string) error {
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return os.MkdirAll(name, 0777|os.ModeDir)
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}
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// RemoveAll delegates to os.RemoveAll.
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func (realFS) RemoveAll(name string) error {
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return os.RemoveAll(name)
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}
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// Open delegates to os.Open.
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func (realFS) Open(name string) (File, error) { return os.Open(name) }
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// CleanedAbs returns a cleaned, absolute path
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// with no symbolic links split into directory
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// and file components. If the entire path is
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// a directory, the file component is an empty
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// string.
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func (x realFS) CleanedAbs(
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path string) (ConfirmedDir, string, error) {
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absRoot, err := filepath.Abs(path)
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if err != nil {
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return "", "", fmt.Errorf(
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"abs path error on '%s' : %v", path, err)
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}
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deLinked, err := filepath.EvalSymlinks(absRoot)
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if err != nil {
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return "", "", fmt.Errorf(
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"evalsymlink failure on '%s' : %v", path, err)
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}
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if x.IsDir(deLinked) {
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return ConfirmedDir(deLinked), "", nil
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}
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d := filepath.Dir(deLinked)
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if !x.IsDir(d) {
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// Programmer/assumption error.
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log.Fatalf("first part of '%s' not a directory", deLinked)
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}
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if d == deLinked {
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// Programmer/assumption error.
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log.Fatalf("d '%s' should be a subset of deLinked", d)
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}
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f := filepath.Base(deLinked)
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if filepath.Join(d, f) != deLinked {
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// Programmer/assumption error.
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log.Fatalf("these should be equal: '%s', '%s'",
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filepath.Join(d, f), deLinked)
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}
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return ConfirmedDir(d), f, nil
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}
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// Exists returns true if os.Stat succeeds.
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func (realFS) Exists(name string) bool {
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_, err := os.Stat(name)
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return err == nil
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}
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// Glob returns the list of matching files
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func (realFS) Glob(pattern string) ([]string, error) {
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return filepath.Glob(pattern)
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}
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// IsDir delegates to os.Stat and FileInfo.IsDir
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func (realFS) IsDir(name string) bool {
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info, err := os.Stat(name)
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if err != nil {
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return false
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}
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return info.IsDir()
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}
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// ReadFile delegates to ioutil.ReadFile.
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func (realFS) ReadFile(name string) ([]byte, error) { return ioutil.ReadFile(name) }
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// WriteFile delegates to ioutil.WriteFile with read/write permissions.
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func (realFS) WriteFile(name string, c []byte) error {
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return ioutil.WriteFile(name, c, 0666)
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}
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