github.com/kaisenlinux/docker.io@v0.0.0-20230510090727-ea55db55fac7/engine/pkg/archive/changes_unix.go (about)

     1  //go:build !windows
     2  // +build !windows
     3  
     4  package archive // import "github.com/docker/docker/pkg/archive"
     5  
     6  import (
     7  	"os"
     8  	"syscall"
     9  
    10  	"github.com/docker/docker/pkg/system"
    11  	"golang.org/x/sys/unix"
    12  )
    13  
    14  func statDifferent(oldStat *system.StatT, newStat *system.StatT) bool {
    15  	// Don't look at size for dirs, its not a good measure of change
    16  	if oldStat.Mode() != newStat.Mode() ||
    17  		oldStat.UID() != newStat.UID() ||
    18  		oldStat.GID() != newStat.GID() ||
    19  		oldStat.Rdev() != newStat.Rdev() ||
    20  		// Don't look at size or modification time for dirs, its not a good
    21  		// measure of change. See https://github.com/moby/moby/issues/9874
    22  		// for a description of the issue with modification time, and
    23  		// https://github.com/moby/moby/pull/11422 for the change.
    24  		// (Note that in the Windows implementation of this function,
    25  		// modification time IS taken as a change). See
    26  		// https://github.com/moby/moby/pull/37982 for more information.
    27  		(oldStat.Mode()&unix.S_IFDIR != unix.S_IFDIR &&
    28  			(!sameFsTimeSpec(oldStat.Mtim(), newStat.Mtim()) || (oldStat.Size() != newStat.Size()))) {
    29  		return true
    30  	}
    31  	return false
    32  }
    33  
    34  func (info *FileInfo) isDir() bool {
    35  	return info.parent == nil || info.stat.Mode()&unix.S_IFDIR != 0
    36  }
    37  
    38  func getIno(fi os.FileInfo) uint64 {
    39  	return fi.Sys().(*syscall.Stat_t).Ino
    40  }
    41  
    42  func hasHardlinks(fi os.FileInfo) bool {
    43  	return fi.Sys().(*syscall.Stat_t).Nlink > 1
    44  }