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268 lines
8.0 KiB
268 lines
8.0 KiB
// +build windows
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/*
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* Minio Cloud Storage, (C) 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// FIXME: Once we have a go version released with the
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// following fix https://go-review.googlesource.com/#/c/41834/.
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// We should actively purge this block.
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package os implements extended safe functions
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// for stdlib "os".
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package os
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import (
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os1 "os"
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"path/filepath"
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"syscall"
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"time"
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)
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const errSharingViolation syscall.Errno = 32
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// fixLongPath returns the extended-length (\\?\-prefixed) form of
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// path when needed, in order to avoid the default 260 character file
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// path limit imposed by Windows. If path is not easily converted to
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// the extended-length form (for example, if path is a relative path
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// or contains .. elements), or is short enough, fixLongPath returns
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// path unmodified.
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//
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// See https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath
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func fixLongPath(path string) string {
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// Do nothing (and don't allocate) if the path is "short".
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// Empirically (at least on the Windows Server 2013 builder),
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// the kernel is arbitrarily okay with < 248 bytes. That
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// matches what the docs above say:
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// "When using an API to create a directory, the specified
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// path cannot be so long that you cannot append an 8.3 file
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// name (that is, the directory name cannot exceed MAX_PATH
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// minus 12)." Since MAX_PATH is 260, 260 - 12 = 248.
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//
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// The MSDN docs appear to say that a normal path that is 248 bytes long
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// will work; empirically the path must be less then 248 bytes long.
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if len(path) < 248 {
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// Don't fix. (This is how Go 1.7 and earlier worked,
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// not automatically generating the \\?\ form)
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return path
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}
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// The extended form begins with \\?\, as in
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// \\?\c:\windows\foo.txt or \\?\UNC\server\share\foo.txt.
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// The extended form disables evaluation of . and .. path
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// elements and disables the interpretation of / as equivalent
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// to \. The conversion here rewrites / to \ and elides
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// . elements as well as trailing or duplicate separators. For
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// simplicity it avoids the conversion entirely for relative
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// paths or paths containing .. elements. For now,
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// \\server\share paths are not converted to
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// \\?\UNC\server\share paths because the rules for doing so
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// are less well-specified.
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if len(path) >= 2 && path[:2] == `\\` {
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// Don't canonicalize UNC paths.
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return path
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}
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if !filepath.IsAbs(path) {
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// Relative path
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return path
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}
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const prefix = `\\?`
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pathbuf := make([]byte, len(prefix)+len(path)+len(`\`))
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copy(pathbuf, prefix)
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n := len(path)
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r, w := 0, len(prefix)
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for r < n {
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switch {
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case os1.IsPathSeparator(path[r]):
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// empty block
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r++
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case path[r] == '.' && (r+1 == n || os1.IsPathSeparator(path[r+1])):
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// /./
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r++
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case r+1 < n && path[r] == '.' && path[r+1] == '.' && (r+2 == n || os1.IsPathSeparator(path[r+2])):
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// /../ is currently unhandled
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return path
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default:
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pathbuf[w] = '\\'
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w++
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for ; r < n && !os1.IsPathSeparator(path[r]); r++ {
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pathbuf[w] = path[r]
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w++
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}
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}
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}
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// A drive's root directory needs a trailing \
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if w == len(`\\?\c:`) {
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pathbuf[w] = '\\'
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w++
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}
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return string(pathbuf[:w])
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}
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// Stat returns a FileInfo structure describing the
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// named file. If there is an error, it will be of type
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// *PathError.
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func Stat(name string) (os1.FileInfo, error) {
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if len(name) == 0 {
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return nil, &os1.PathError{
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Op: "Stat",
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Path: name,
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Err: syscall.Errno(syscall.ERROR_PATH_NOT_FOUND),
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}
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}
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if name == os1.DevNull {
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return &devNullStat, nil
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}
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namep, err := syscall.UTF16PtrFromString(fixLongPath(name))
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if err != nil {
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return nil, &os1.PathError{Op: "Stat", Path: name, Err: err}
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}
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// Use Windows I/O manager to dereference the symbolic link, as per
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// https://blogs.msdn.microsoft.com/oldnewthing/20100212-00/?p=14963/
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h, err := syscall.CreateFile(namep, 0, 0, nil,
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syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
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if err != nil {
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if err == errSharingViolation {
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// try FindFirstFile now that CreateFile failed
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return statWithFindFirstFile(name, namep)
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}
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return nil, &os1.PathError{Op: "CreateFile", Path: name, Err: err}
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}
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defer syscall.CloseHandle(h)
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var d syscall.ByHandleFileInformation
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if err = syscall.GetFileInformationByHandle(h, &d); err != nil {
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return nil, &os1.PathError{
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Op: "GetFileInformationByHandle",
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Path: name,
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Err: err,
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}
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}
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return &fileStat{
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name: filepath.Base(name),
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sys: syscall.Win32FileAttributeData{
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FileAttributes: d.FileAttributes,
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CreationTime: d.CreationTime,
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LastAccessTime: d.LastAccessTime,
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LastWriteTime: d.LastWriteTime,
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FileSizeHigh: d.FileSizeHigh,
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FileSizeLow: d.FileSizeLow,
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},
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vol: d.VolumeSerialNumber,
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idxhi: d.FileIndexHigh,
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idxlo: d.FileIndexLow,
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// fileStat.path is used by os1.SameFile to decide, if it needs
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// to fetch vol, idxhi and idxlo. But these are already set,
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// so set fileStat.path to "" to prevent os1.SameFile doing it again.
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// Also do not set fileStat.filetype, because it is only used for
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// console and stdin/stdout. But you cannot call os1.Stat for these.
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}, nil
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}
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// statWithFindFirstFile is used by Stat to handle special case of stating
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// c:\pagefile.sys. We might discovered other files need similar treatment.
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func statWithFindFirstFile(name string, namep *uint16) (os1.FileInfo, error) {
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var fd syscall.Win32finddata
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h, err := syscall.FindFirstFile(namep, &fd)
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if err != nil {
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return nil, &os1.PathError{Op: "FindFirstFile", Path: name, Err: err}
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}
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syscall.FindClose(h)
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fullpath := name
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if !filepath.IsAbs(fullpath) {
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fullpath, err = syscall.FullPath(fullpath)
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if err != nil {
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return nil, &os1.PathError{Op: "FullPath", Path: name, Err: err}
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}
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}
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return &fileStat{
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name: filepath.Base(name),
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path: fullpath,
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sys: syscall.Win32FileAttributeData{
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FileAttributes: fd.FileAttributes,
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CreationTime: fd.CreationTime,
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LastAccessTime: fd.LastAccessTime,
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LastWriteTime: fd.LastWriteTime,
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FileSizeHigh: fd.FileSizeHigh,
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FileSizeLow: fd.FileSizeLow,
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},
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}, nil
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}
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// A fileStat is the implementation of os1.FileInfo returned by stat.
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type fileStat struct {
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name string
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sys syscall.Win32FileAttributeData
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filetype uint32 // what syscall.GetFileType returns
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path string
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vol uint32
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idxhi uint32
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idxlo uint32
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}
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func (fs *fileStat) Name() string { return fs.name }
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func (fs *fileStat) IsDir() bool { return fs.Mode().IsDir() }
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func (fs *fileStat) Size() int64 {
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return int64(fs.sys.FileSizeHigh)<<32 + int64(fs.sys.FileSizeLow)
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}
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// devNullStat is fileStat structure describing DevNull file ("NUL").
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var devNullStat = fileStat{
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name: os1.DevNull,
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vol: 0,
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idxhi: 0,
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idxlo: 0,
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}
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func (fs *fileStat) Mode() (m os1.FileMode) {
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if fs == &devNullStat {
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return os1.ModeDevice | os1.ModeCharDevice | 0666
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}
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if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
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m |= 0444
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} else {
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m |= 0666
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}
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if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0 {
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return m | os1.ModeSymlink
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}
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if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
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m |= os1.ModeDir | 0111
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}
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switch fs.filetype {
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case syscall.FILE_TYPE_PIPE:
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m |= os1.ModeNamedPipe
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case syscall.FILE_TYPE_CHAR:
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m |= os1.ModeCharDevice
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}
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return m
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}
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func (fs *fileStat) ModTime() time.Time {
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return time.Unix(0, fs.sys.LastWriteTime.Nanoseconds())
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}
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// Sys returns syscall.Win32FileAttributeData for file fs.
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func (fs *fileStat) Sys() interface{} { return &fs.sys }
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