minio/cmd/os-readdir_windows.go

188 lines
4.7 KiB
Go
Raw Normal View History

// +build windows
/*
* MinIO Cloud Storage, (C) 2016-2020 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 cmd
import (
"io"
"os"
"syscall"
)
// Return all the entries at the directory dirPath.
func readDir(dirPath string) (entries []string, err error) {
return readDirN(dirPath, -1)
}
// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into
// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, filter func(name string, typ os.FileMode) error) error {
f, err := os.Open(dirPath)
if err != nil {
if osErrToFileErr(err) == errFileNotFound {
return nil
}
return osErrToFileErr(err)
}
defer f.Close()
// Check if file or dir. This is the quickest way.
// Do not remove this check, on windows syscall.FindNextFile
// would throw an exception if Fd() points to a file
// instead of a directory, we need to quickly fail
// in such situations - this workadound is expected.
if _, err = f.Seek(0, io.SeekStart); err == nil {
return errFileNotFound
}
data := &syscall.Win32finddata{}
for {
e := syscall.FindNextFile(syscall.Handle(f.Fd()), data)
if e != nil {
if e == syscall.ERROR_NO_MORE_FILES {
break
} else {
if isSysErrPathNotFound(e) {
return nil
}
err = osErrToFileErr(&os.PathError{
Op: "FindNextFile",
Path: dirPath,
Err: e,
})
if err == errFileNotFound {
return nil
}
return err
}
}
name := syscall.UTF16ToString(data.FileName[0:])
if name == "" || name == "." || name == ".." { // Useless names
continue
}
var typ os.FileMode = 0 // regular file
switch {
case data.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0:
// Reparse point is a symlink
fi, err := os.Stat(pathJoin(dirPath, string(name)))
if err != nil {
// It got deleted in the meantime, not found
// or returns too many symlinks ignore this
// file/directory.
if osIsNotExist(err) || isSysErrPathNotFound(err) ||
isSysErrTooManySymlinks(err) {
continue
}
return err
}
if fi.IsDir() {
// Ignore symlinked directories.
continue
}
typ = fi.Mode()
case data.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0:
typ = os.ModeDir
}
if e = filter(name, typ); e == errDoneForNow {
// filtering requested to return by caller.
return nil
}
}
return nil
}
// Return N entries at the directory dirPath. If count is -1, return all entries
func readDirN(dirPath string, count int) (entries []string, err error) {
f, err := os.Open(dirPath)
if err != nil {
return nil, osErrToFileErr(err)
}
defer f.Close()
// Check if file or dir. This is the quickest way.
// Do not remove this check, on windows syscall.FindNextFile
// would throw an exception if Fd() points to a file
// instead of a directory, we need to quickly fail
// in such situations - this workadound is expected.
if _, err = f.Seek(0, io.SeekStart); err == nil {
return nil, errFileNotFound
}
data := &syscall.Win32finddata{}
handle := syscall.Handle(f.Fd())
for count != 0 {
e := syscall.FindNextFile(handle, data)
if e != nil {
if e == syscall.ERROR_NO_MORE_FILES {
break
} else {
return nil, osErrToFileErr(&os.PathError{
Op: "FindNextFile",
Path: dirPath,
Err: e,
})
}
}
name := syscall.UTF16ToString(data.FileName[0:])
if name == "" || name == "." || name == ".." { // Useless names
continue
}
switch {
case data.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0:
// Reparse point is a symlink
fi, err := os.Stat(pathJoin(dirPath, string(name)))
if err != nil {
// It got deleted in the meantime, not found
// or returns too many symlinks ignore this
// file/directory.
if osIsNotExist(err) || isSysErrPathNotFound(err) ||
isSysErrTooManySymlinks(err) {
continue
}
return nil, err
}
if fi.IsDir() {
// directory symlinks are ignored.
continue
}
case data.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0:
name = name + SlashSeparator
}
count--
entries = append(entries, name)
}
return entries, nil
}
func globalSync() {
// no-op on windows
}