mirror of
https://github.com/octoleo/restic.git
synced 2024-12-05 03:13:18 +00:00
03aad742d3
Paths that only contain the volume shadow copy snapshot name require special treatment. These paths must end with a slash for regular file operations to work.
137 lines
4.2 KiB
Go
137 lines
4.2 KiB
Go
package fs
|
|
|
|
import (
|
|
"math/rand"
|
|
"os"
|
|
"path/filepath"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/restic/restic/internal/restic"
|
|
"golang.org/x/sys/windows"
|
|
)
|
|
|
|
// fixpath returns an absolute path on windows, so restic can open long file
|
|
// names.
|
|
func fixpath(name string) string {
|
|
abspath, err := filepath.Abs(name)
|
|
if err == nil {
|
|
// Check if \\?\UNC\ already exist
|
|
if strings.HasPrefix(abspath, uncPathPrefix) {
|
|
return abspath
|
|
}
|
|
// Check if \\?\GLOBALROOT exists which marks volume shadow copy snapshots
|
|
if strings.HasPrefix(abspath, globalRootPrefix) {
|
|
if strings.Count(abspath, `\`) == 5 {
|
|
// Append slash if this just a volume name, e.g. `\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopyXX`
|
|
// Without the trailing slash any access to the volume itself will fail.
|
|
return abspath + string(filepath.Separator)
|
|
}
|
|
return abspath
|
|
}
|
|
// Check if \\?\ already exist
|
|
if strings.HasPrefix(abspath, extendedPathPrefix) {
|
|
return abspath
|
|
}
|
|
// Check if path starts with \\
|
|
if strings.HasPrefix(abspath, `\\`) {
|
|
return strings.Replace(abspath, `\\`, uncPathPrefix, 1)
|
|
}
|
|
// Normal path
|
|
return extendedPathPrefix + abspath
|
|
}
|
|
return name
|
|
}
|
|
|
|
// TempFile creates a temporary file which is marked as delete-on-close
|
|
func TempFile(dir, prefix string) (f *os.File, err error) {
|
|
// slightly modified implementation of os.CreateTemp(dir, prefix) to allow us to add
|
|
// the FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE flags.
|
|
// These provide two large benefits:
|
|
// FILE_ATTRIBUTE_TEMPORARY tells Windows to keep the file in memory only if possible
|
|
// which reduces the amount of unnecessary disk writes.
|
|
// FILE_FLAG_DELETE_ON_CLOSE instructs Windows to automatically delete the file once
|
|
// all file descriptors are closed.
|
|
|
|
if dir == "" {
|
|
dir = os.TempDir()
|
|
}
|
|
|
|
access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE)
|
|
creation := uint32(windows.CREATE_NEW)
|
|
share := uint32(0) // prevent other processes from accessing the file
|
|
flags := uint32(windows.FILE_ATTRIBUTE_TEMPORARY | windows.FILE_FLAG_DELETE_ON_CLOSE)
|
|
|
|
rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
|
|
for i := 0; i < 10000; i++ {
|
|
randSuffix := strconv.Itoa(int(1e9 + rnd.Intn(1e9)%1e9))[1:]
|
|
path := filepath.Join(dir, prefix+randSuffix)
|
|
|
|
ptr, err := windows.UTF16PtrFromString(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
h, err := windows.CreateFile(ptr, access, share, nil, creation, flags, 0)
|
|
if os.IsExist(err) {
|
|
continue
|
|
}
|
|
return os.NewFile(uintptr(h), path), err
|
|
}
|
|
|
|
// Proper error handling is still to do
|
|
return nil, os.ErrExist
|
|
}
|
|
|
|
// Chmod changes the mode of the named file to mode.
|
|
func chmod(name string, mode os.FileMode) error {
|
|
return os.Chmod(fixpath(name), mode)
|
|
}
|
|
|
|
// clearSystem removes the system attribute from the file.
|
|
func clearSystem(path string) error {
|
|
return clearAttribute(path, windows.FILE_ATTRIBUTE_SYSTEM)
|
|
}
|
|
|
|
// clearAttribute removes the specified attribute from the file.
|
|
func clearAttribute(path string, attribute uint32) error {
|
|
ptr, err := windows.UTF16PtrFromString(fixpath(path))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fileAttributes, err := windows.GetFileAttributes(ptr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if fileAttributes&attribute != 0 {
|
|
// Clear the attribute
|
|
fileAttributes &= ^uint32(attribute)
|
|
err = windows.SetFileAttributes(ptr, fileAttributes)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// openHandleForEA return a file handle for file or dir for setting/getting EAs
|
|
func openHandleForEA(nodeType restic.NodeType, path string, writeAccess bool) (handle windows.Handle, err error) {
|
|
path = fixpath(path)
|
|
fileAccess := windows.FILE_READ_EA
|
|
if writeAccess {
|
|
fileAccess = fileAccess | windows.FILE_WRITE_EA
|
|
}
|
|
|
|
switch nodeType {
|
|
case restic.NodeTypeFile:
|
|
utf16Path := windows.StringToUTF16Ptr(path)
|
|
handle, err = windows.CreateFile(utf16Path, uint32(fileAccess), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL, 0)
|
|
case restic.NodeTypeDir:
|
|
utf16Path := windows.StringToUTF16Ptr(path)
|
|
handle, err = windows.CreateFile(utf16Path, uint32(fileAccess), 0, nil, windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL|windows.FILE_FLAG_BACKUP_SEMANTICS, 0)
|
|
default:
|
|
return 0, nil
|
|
}
|
|
return handle, err
|
|
}
|