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|
package fs
import (
"io"
"os"
"github.com/Microsoft/go-winio"
"github.com/pkg/errors"
"golang.org/x/sys/windows"
)
const (
seTakeOwnershipPrivilege = "SeTakeOwnershipPrivilege"
)
func getUIDGID(fi os.FileInfo) (uid, gid int) {
return 0, 0
}
func getFileSecurityInfo(name string) (*windows.SID, *windows.ACL, error) {
secInfo, err := windows.GetNamedSecurityInfo(
name, windows.SE_FILE_OBJECT,
windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION)
if err != nil {
return nil, nil, errors.Wrap(err, "fetching security info")
}
sid, _, err := secInfo.Owner()
if err != nil {
return nil, nil, errors.Wrap(err, "fetching owner SID")
}
dacl, _, err := secInfo.DACL()
if err != nil {
return nil, nil, errors.Wrap(err, "fetching dacl")
}
return sid, dacl, nil
}
func (c *copier) copyFileInfo(fi os.FileInfo, src, name string) error {
if err := os.Chmod(name, fi.Mode()); err != nil {
return errors.Wrapf(err, "failed to chmod %s", name)
}
sid, dacl, err := getFileSecurityInfo(src)
if err != nil {
return errors.Wrap(err, "getting file info")
}
if c.chown != nil {
// Use the defined chowner.
usr := &User{SID: sid.String()}
if err := Chown(name, usr, c.chown); err != nil {
return errors.Wrapf(err, "failed to chown %s", name)
}
return nil
} else {
// Copy file ownership and ACL from the source file.
// We need SeRestorePrivilege and SeTakeOwnershipPrivilege in order
// to restore security info on a file, especially if we're trying to
// apply security info which includes SIDs not necessarily present on
// the host.
privileges := []string{winio.SeRestorePrivilege, seTakeOwnershipPrivilege}
if err := winio.EnableProcessPrivileges(privileges); err != nil {
return err
}
defer winio.DisableProcessPrivileges(privileges)
if err := windows.SetNamedSecurityInfo(
name, windows.SE_FILE_OBJECT,
windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION,
sid, nil, dacl, nil); err != nil {
return err
}
}
if err := c.copyFileTimestamp(fi, name); err != nil {
return err
}
return nil
}
func (c *copier) copyFileTimestamp(fi os.FileInfo, name string) error {
if c.utime != nil {
return Utimes(name, c.utime)
}
if fi.Mode()&os.ModeSymlink == 0 {
if err := os.Chtimes(name, fi.ModTime(), fi.ModTime()); err != nil {
return errors.Wrap(err, "changing mtime")
}
}
return nil
}
func copyFile(source, target string) error {
src, err := os.Open(source)
if err != nil {
return errors.Wrapf(err, "failed to open source %s", source)
}
defer src.Close()
tgt, err := os.Create(target)
if err != nil {
return errors.Wrapf(err, "failed to open target %s", target)
}
defer tgt.Close()
return copyFileContent(tgt, src)
}
func copyFileContent(dst, src *os.File) error {
buf := bufferPool.Get().(*[]byte)
_, err := io.CopyBuffer(dst, src, *buf)
bufferPool.Put(buf)
return err
}
func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
return nil
}
func copyDevice(dst string, fi os.FileInfo) error {
return errors.New("device copy not supported")
}
|
