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minio/pkg/ioutils/filepath.go

144 lines
3.8 KiB

/*
* Minio Cloud Storage, (C) 2015 Minio, Inc.
*
* 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 ioutils
import (
"errors"
"io"
"os"
"path/filepath"
"sort"
)
// IsDirEmpty Check if a directory is empty
func IsDirEmpty(dirname string) (status bool, err error) {
f, err := os.Open(dirname)
if err == nil {
defer f.Close()
if _, err = f.Readdirnames(1); err == io.EOF {
status = true
err = nil
}
}
return
}
// FTW walks the file tree rooted at root, calling walkFn for each file or
// directory in the tree, including root.
func FTW(root string, walkFn FTWFunc) error {
info, err := os.Lstat(root)
if err != nil {
return walkFn(root, nil, err)
}
return walk(root, info, walkFn)
}
// byName implements sort.Interface for sorting os.FileInfo list.
type byName []os.FileInfo
func (f byName) Len() int { return len(f) }
func (f byName) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
func (f byName) Less(i, j int) bool {
n1 := f[i].Name()
if f[i].IsDir() {
n1 = n1 + string(os.PathSeparator)
}
n2 := f[j].Name()
if f[i].IsDir() {
n2 = n2 + string(os.PathSeparator)
}
return n1 < n2
}
// readDir reads the directory named by dirname and returns
// a sorted list of directory entries.
func readDir(dirname string) (fi []os.FileInfo, err error) {
f, err := os.Open(dirname)
if err == nil {
defer f.Close()
if fi, err = f.Readdir(-1); fi != nil {
sort.Sort(byName(fi))
}
}
return
}
// FTWFunc is the type of the function called for each file or directory
// visited by Walk. The path argument contains the argument to Walk as a
// prefix; that is, if Walk is called with "dir", which is a directory
// containing the file "a", the walk function will be called with argument
// "dir/a". The info argument is the os.FileInfo for the named path.
type FTWFunc func(path string, info os.FileInfo, err error) error
// ErrSkipDir is used as a return value from WalkFuncs to indicate that
// the directory named in the call is to be skipped. It is not returned
// as an error by any function.
var ErrSkipDir = errors.New("skip this directory")
// ErrSkipFile is used as a return value from WalkFuncs to indicate that
// the file named in the call is to be skipped. It is not returned
// as an error by any function.
var ErrSkipFile = errors.New("skip this file")
// ErrDirNotEmpty is used to throw error on directories which have atleast one regular
// file or a symlink left
var ErrDirNotEmpty = errors.New("directory not empty")
// walk recursively descends path, calling walkFn.
func walk(path string, info os.FileInfo, walkFn FTWFunc) error {
err := walkFn(path, info, nil)
if err != nil {
if info.Mode().IsDir() && err == ErrSkipDir {
return nil
}
if info.Mode().IsRegular() && err == ErrSkipFile {
return nil
}
return err
}
if !info.IsDir() {
return nil
}
fis, err := readDir(path)
if err != nil {
return walkFn(path, info, err)
}
for _, fileInfo := range fis {
filename := filepath.Join(path, fileInfo.Name())
if err != nil {
if err := walkFn(filename, fileInfo, err); err != nil && err != ErrSkipDir && err != ErrSkipFile {
return err
}
} else {
err = walk(filename, fileInfo, walkFn)
if err != nil {
if err == ErrSkipDir || err == ErrSkipFile {
return nil
}
return err
}
}
}
return nil
}