minio/cmd/os-readdir_windows.go
2021-08-18 18:35:22 -07:00

191 lines
4.8 KiB
Go

//go:build windows
// +build windows
// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"io"
"os"
"syscall"
)
func access(name string) error {
_, err := os.Lstat(name)
return err
}
// 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.
func readDirWithOpts(dirPath string, opts readDirOpts) (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())
count := opts.count
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 !opts.followDirSymlink && 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
}