dotcloud/docker

//go:build !windows

package archive // import "github.com/docker/docker/pkg/archive"

import (
    "os"
    "syscall"

    "github.com/docker/docker/pkg/system"
    "golang.org/x/sys/unix"
)

func statDifferent(oldStat *system.StatT, newStat *system.StatT) bool {
    // Don't look at size for dirs, its not a good measure of change
    if oldStat.Mode() != newStat.Mode() ||
        oldStat.UID() != newStat.UID() ||
        oldStat.GID() != newStat.GID() ||
        oldStat.Rdev() != newStat.Rdev() ||
        // Don't look at size or modification time for dirs, its not a good
        // measure of change. See https://github.com/moby/moby/issues/9874
        // for a description of the issue with modification time, and
        // https://github.com/moby/moby/pull/11422 for the change.
        // (Note that in the Windows implementation of this function,
        // modification time IS taken as a change). See
        // https://github.com/moby/moby/pull/37982 for more information.
        (oldStat.Mode()&unix.S_IFDIR != unix.S_IFDIR &&
            (!sameFsTimeSpec(oldStat.Mtim(), newStat.Mtim()) || (oldStat.Size() != newStat.Size()))) {
        return true
    }
    return false
}

func (info *FileInfo) isDir() bool {
    return info.parent == nil || info.stat.Mode()&unix.S_IFDIR != 0
}

func getIno(fi os.FileInfo) uint64 {
    return fi.Sys().(*syscall.Stat_t).Ino
}

func hasHardlinks(fi os.FileInfo) bool {
    return fi.Sys().(*syscall.Stat_t).Nlink > 1
}