github.com/opencontainers/umoci@v0.4.8-0.20240508124516-656e4836fb0d/oci/layer/tar_unix.go (about)

     1  /*
     2   * umoci: Umoci Modifies Open Containers' Images
     3   * Copyright (C) 2016-2020 SUSE LLC
     4   *
     5   * Licensed under the Apache License, Version 2.0 (the "License");
     6   * you may not use this file except in compliance with the License.
     7   * You may obtain a copy of the License at
     8   *
     9   *    http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package layer
    19  
    20  import (
    21  	"archive/tar"
    22  
    23  	"golang.org/x/sys/unix"
    24  )
    25  
    26  func updateHeader(hdr *tar.Header, s unix.Stat_t) {
    27  	// Currently the Go stdlib doesn't fill in the major/minor numbers of
    28  	// devices, so we have to do it manually.
    29  	if s.Mode&unix.S_IFBLK == unix.S_IFBLK || s.Mode&unix.S_IFCHR == unix.S_IFCHR {
    30  		hdr.Devmajor = int64(unix.Major(uint64(s.Rdev)))
    31  		hdr.Devminor = int64(unix.Minor(uint64(s.Rdev)))
    32  	}
    33  }