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fsondisk.go
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fsondisk.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package filesys
import (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
)
var _ FileSystem = fsOnDisk{}
// fsOnDisk implements FileSystem using the local filesystem.
type fsOnDisk struct{}
// MakeFsOnDisk makes an instance of fsOnDisk.
func MakeFsOnDisk() FileSystem {
return fsOnDisk{}
}
// Create delegates to os.Create.
func (fsOnDisk) Create(name string) (File, error) { return os.Create(name) }
// Mkdir delegates to os.Mkdir.
func (fsOnDisk) Mkdir(name string) error {
return os.Mkdir(name, 0777|os.ModeDir)
}
// MkdirAll delegates to os.MkdirAll.
func (fsOnDisk) MkdirAll(name string) error {
return os.MkdirAll(name, 0777|os.ModeDir)
}
// RemoveAll delegates to os.RemoveAll.
func (fsOnDisk) RemoveAll(name string) error {
return os.RemoveAll(name)
}
// Open delegates to os.Open.
func (fsOnDisk) Open(name string) (File, error) { return os.Open(name) }
// CleanedAbs converts the given path into a
// directory and a file name, where the directory
// is represented as a ConfirmedDir and all that implies.
// If the entire path is a directory, the file component
// is an empty string.
func (x fsOnDisk) CleanedAbs(
path string) (ConfirmedDir, string, error) {
absRoot, err := filepath.Abs(path)
if err != nil {
return "", "", fmt.Errorf(
"abs path error on '%s' : %v", path, err)
}
deLinked, err := filepath.EvalSymlinks(absRoot)
if err != nil {
return "", "", fmt.Errorf(
"evalsymlink failure on '%s' : %v", path, err)
}
if x.IsDir(deLinked) {
return ConfirmedDir(deLinked), "", nil
}
d := filepath.Dir(deLinked)
if !x.IsDir(d) {
// Programmer/assumption error.
log.Fatalf("first part of '%s' not a directory", deLinked)
}
if d == deLinked {
// Programmer/assumption error.
log.Fatalf("d '%s' should be a subset of deLinked", d)
}
f := filepath.Base(deLinked)
if filepath.Join(d, f) != deLinked {
// Programmer/assumption error.
log.Fatalf("these should be equal: '%s', '%s'",
filepath.Join(d, f), deLinked)
}
return ConfirmedDir(d), f, nil
}
// Exists returns true if os.Stat succeeds.
func (fsOnDisk) Exists(name string) bool {
_, err := os.Stat(name)
return err == nil
}
// Glob returns the list of matching files
func (fsOnDisk) Glob(pattern string) ([]string, error) {
return filepath.Glob(pattern)
}
// IsDir delegates to os.Stat and FileInfo.IsDir
func (fsOnDisk) IsDir(name string) bool {
info, err := os.Stat(name)
if err != nil {
return false
}
return info.IsDir()
}
// ReadFile delegates to ioutil.ReadFile.
func (fsOnDisk) ReadFile(name string) ([]byte, error) { return ioutil.ReadFile(name) }
// WriteFile delegates to ioutil.WriteFile with read/write permissions.
func (fsOnDisk) WriteFile(name string, c []byte) error {
return ioutil.WriteFile(name, c, 0666)
}
// Walk delegates to filepath.Walk.
func (fsOnDisk) Walk(path string, walkFn filepath.WalkFunc) error {
return filepath.Walk(path, walkFn)
}