github.com/wlan0/docker@v1.5.0/pkg/archive/archive_unix.go (about)

     1  // +build !windows
     2  
     3  package archive
     4  
     5  import (
     6  	"errors"
     7  	"syscall"
     8  
     9  	"github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar"
    10  )
    11  
    12  func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (nlink uint32, inode uint64, err error) {
    13  	s, ok := stat.(*syscall.Stat_t)
    14  
    15  	if !ok {
    16  		err = errors.New("cannot convert stat value to syscall.Stat_t")
    17  		return
    18  	}
    19  
    20  	nlink = uint32(s.Nlink)
    21  	inode = uint64(s.Ino)
    22  
    23  	// Currently go does not fil in the major/minors
    24  	if s.Mode&syscall.S_IFBLK == syscall.S_IFBLK ||
    25  		s.Mode&syscall.S_IFCHR == syscall.S_IFCHR {
    26  		hdr.Devmajor = int64(major(uint64(s.Rdev)))
    27  		hdr.Devminor = int64(minor(uint64(s.Rdev)))
    28  	}
    29  
    30  	return
    31  }
    32  
    33  func major(device uint64) uint64 {
    34  	return (device >> 8) & 0xfff
    35  }
    36  
    37  func minor(device uint64) uint64 {
    38  	return (device & 0xff) | ((device >> 12) & 0xfff00)
    39  }