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//go:build windows
// +build windows
package fsutil
import (
"fmt"
iofs "io/fs"
"os"
"syscall"
"github.com/Microsoft/go-winio"
"github.com/pkg/errors"
"github.com/tonistiigi/fsutil/types"
)
func rewriteMetadata(p string, stat *types.Stat) error {
return chtimes(p, stat.ModTime)
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(path string, stat *types.Stat) error {
return errors.New("Not implemented on windows")
}
func getFileHandle(path string, info iofs.FileInfo) (syscall.Handle, error) {
p, err := syscall.UTF16PtrFromString(path)
if err != nil {
return 0, errors.Wrap(err, "converting string to UTF-16")
}
attrs := uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
if info.Mode()&os.ModeSymlink != 0 {
// Use FILE_FLAG_OPEN_REPARSE_POINT, otherwise CreateFile will follow symlink.
// See https://docs.microsoft.com/en-us/windows/desktop/FileIO/symbolic-link-effects-on-file-systems-functions#createfile-and-createfiletransacted
attrs |= syscall.FILE_FLAG_OPEN_REPARSE_POINT
}
h, err := syscall.CreateFile(p, 0, 0, nil, syscall.OPEN_EXISTING, attrs, 0)
if err != nil {
return 0, errors.Wrap(err, "getting file handle")
}
return h, nil
}
func readlink(path string, info iofs.FileInfo) ([]byte, error) {
h, err := getFileHandle(path, info)
if err != nil {
return nil, errors.Wrap(err, "getting file handle")
}
defer syscall.CloseHandle(h)
rdbbuf := make([]byte, syscall.MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
var bytesReturned uint32
err = syscall.DeviceIoControl(h, syscall.FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil)
if err != nil {
return nil, errors.Wrap(err, "sending I/O control command")
}
return rdbbuf[:bytesReturned], nil
}
func getReparsePoint(path string, info iofs.FileInfo) (*winio.ReparsePoint, error) {
target, err := readlink(path, info)
if err != nil {
return nil, errors.Wrap(err, "fetching link")
}
rp, err := winio.DecodeReparsePoint(target)
if err != nil {
return nil, errors.Wrap(err, "decoding reparse point")
}
return rp, nil
}
func renameFile(src, dst string) error {
info, err := os.Lstat(dst)
if err != nil {
if !os.IsNotExist(err) {
return errors.Wrap(err, "getting file info")
}
}
if info != nil && info.Mode()&os.ModeSymlink != 0 {
dstInfoRp, err := getReparsePoint(dst, info)
if err != nil {
return errors.Wrap(err, "getting reparse point")
}
if dstInfoRp.IsMountPoint {
return fmt.Errorf("%s is a mount point", dst)
}
if err := os.Remove(dst); err != nil {
return errors.Wrapf(err, "removing %s", dst)
}
}
if err := os.Rename(src, dst); err != nil {
return errors.Wrapf(err, "failed to rename %s to %s", src, dst)
}
return nil
}
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