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89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
2 years ago
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package fs
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import (
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"errors"
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"fmt"
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"io"
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"os"
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winio "github.com/Microsoft/go-winio"
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"golang.org/x/sys/windows"
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)
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const (
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seTakeOwnershipPrivilege = "SeTakeOwnershipPrivilege"
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)
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func copyFileInfo(fi os.FileInfo, src, name string) error {
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if err := os.Chmod(name, fi.Mode()); err != nil {
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return fmt.Errorf("failed to chmod %s: %w", name, err)
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}
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// Copy file ownership and ACL
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// We need SeRestorePrivilege and SeTakeOwnershipPrivilege in order
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// to restore security info on a file, especially if we're trying to
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// apply security info which includes SIDs not necessarily present on
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// the host.
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privileges := []string{winio.SeRestorePrivilege, seTakeOwnershipPrivilege}
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if err := winio.EnableProcessPrivileges(privileges); err != nil {
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return err
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}
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defer winio.DisableProcessPrivileges(privileges)
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secInfo, err := windows.GetNamedSecurityInfo(
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src, windows.SE_FILE_OBJECT,
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windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION)
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if err != nil {
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return err
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}
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dacl, _, err := secInfo.DACL()
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if err != nil {
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return err
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}
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sid, _, err := secInfo.Owner()
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if err != nil {
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return err
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}
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if err := windows.SetNamedSecurityInfo(
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name, windows.SE_FILE_OBJECT,
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windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION,
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sid, nil, dacl, nil); err != nil {
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return err
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}
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return nil
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}
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func copyFileContent(dst, src *os.File) error {
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buf := bufferPool.Get().(*[]byte)
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_, err := io.CopyBuffer(dst, src, *buf)
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bufferPool.Put(buf)
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return err
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}
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func copyXAttrs(dst, src string, excludes map[string]struct{}, errorHandler XAttrErrorHandler) error {
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return nil
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}
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func copyIrregular(dst string, fi os.FileInfo) error {
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return errors.New("irregular copy not supported")
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}
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