vendor: update buildkit to master@9624ab4

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/containerd/continuity/fs/copy_windows.go

@@ -0,0 +1,90 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package fs
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+
+	winio "github.com/Microsoft/go-winio"
+	"golang.org/x/sys/windows"
+)
+
+const (
+	seTakeOwnershipPrivilege = "SeTakeOwnershipPrivilege"
+)
+
+func copyFileInfo(fi os.FileInfo, src, name string) error {
+	if err := os.Chmod(name, fi.Mode()); err != nil {
+		return fmt.Errorf("failed to chmod %s: %w", name, err)
+	}
+
+	// Copy file ownership and ACL
+	// 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)
+
+	secInfo, err := windows.GetNamedSecurityInfo(
+		src, windows.SE_FILE_OBJECT,
+		windows.OWNER_SECURITY_INFORMATION|windows.DACL_SECURITY_INFORMATION)
+
+	if err != nil {
+		return err
+	}
+
+	dacl, _, err := secInfo.DACL()
+	if err != nil {
+		return err
+	}
+
+	sid, _, err := secInfo.Owner()
+	if err != nil {
+		return err
+	}
+
+	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
+	}
+	return nil
+}
+
+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, excludes map[string]struct{}, errorHandler XAttrErrorHandler) error {
+	return nil
+}
+
+func copyIrregular(dst string, fi os.FileInfo) error {
+	return errors.New("irregular copy not supported")
+}