minio/posix-utils_windows.go

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// +build windows
/*
* Minio Cloud Storage, (C) 2016 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 main
import (
"io"
"os"
"path/filepath"
"strings"
"syscall"
)
// isValidVolname verifies a volname name in accordance with object
// layer requirements.
func isValidVolname(volname string) bool {
if len(volname) < 3 || len(volname) > 63 {
return false
}
// Volname shouldn't have reserved characters on windows in it.
return !strings.ContainsAny(volname, `\:*?\"<>|`)
}
// mkdirAll creates a directory named path,
// along with any necessary parents, and returns nil,
// or else returns an error. The permission bits perm are used
// for all directories that mkdirAll creates. If path is already
// a directory, mkdirAll does nothing and returns nil.
func mkdirAll(path string, perm os.FileMode) error {
// Fast path: if we can tell whether path is a directory or file, stop with success or error.
dir, err := os.Stat(preparePath(path))
if err == nil {
if dir.IsDir() {
return nil
}
return &os.PathError{
Op: "mkdir",
Path: path,
Err: syscall.ENOTDIR,
}
}
// Slow path: make sure parent exists and then call Mkdir for path.
i := len(path)
for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
i--
}
j := i
for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
j--
}
if j > 1 {
// Create parent
parent := path[0 : j-1]
if parent != filepath.VolumeName(parent) {
err = mkdirAll(parent, perm)
if err != nil {
return err
}
}
}
// Parent now exists; invoke Mkdir and use its result.
err = os.Mkdir(preparePath(path), perm)
if err != nil {
// Handle arguments like "foo/." by
// double-checking that directory doesn't exist.
dir, err1 := os.Lstat(preparePath(path))
if err1 == nil && dir.IsDir() {
return nil
}
return err
}
return nil
}
// removeAll removes path and any children it contains.
// It removes everything it can but returns the first error
// it encounters. If the path does not exist, RemoveAll
// returns nil (no error).
func removeAll(path string) error {
// Simple case: if Remove works, we're done.
err := os.Remove(preparePath(path))
if err == nil || os.IsNotExist(err) {
return nil
}
// Otherwise, is this a directory we need to recurse into?
dir, serr := os.Lstat(preparePath(path))
if serr != nil {
if serr, ok := serr.(*os.PathError); ok && (os.IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
return nil
}
return serr
}
if !dir.IsDir() {
// Not a directory; return the error from Remove.
return err
}
// Directory.
fd, err := os.Open(preparePath(path))
if err != nil {
if os.IsNotExist(err) {
// Race. It was deleted between the Lstat and Open.
// Return nil per RemoveAll's docs.
return nil
}
return err
}
// Remove contents & return first error.
err = nil
for {
names, err1 := fd.Readdirnames(4096) // Get 4k entries.
for _, name := range names {
err1 = removeAll(path + string(os.PathSeparator) + name)
if err == nil {
err = err1
}
}
if err1 == io.EOF {
break
}
// If Readdirnames returned an error, use it.
if err == nil {
err = err1
}
if len(names) == 0 {
break
}
}
// Close directory, because windows won't remove opened directory.
fd.Close()
// Remove directory.
err1 := os.Remove(preparePath(path))
if err1 == nil || os.IsNotExist(err1) {
return nil
}
if err == nil {
err = err1
}
return err
}