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moby--moby/vendor/archive/tar/stat_unix.go
Tonis Tiigi 7260adfff9 vendor: add local copy of archive/tar
This version avoids doing name lookups on creating tarball that
should be avoided in to not hit loading glibc shared libraries.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit aa6a9891b0)
Signed-off-by: Tibor Vass <tibor@docker.com>
2020-04-24 11:22:24 -07:00

81 lines
2.6 KiB
Go

// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build aix linux darwin dragonfly freebsd openbsd netbsd solaris
package tar
import (
"os"
"runtime"
"syscall"
)
func init() {
sysStat = statUnix
}
func statUnix(fi os.FileInfo, h *Header) error {
sys, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
return nil
}
h.Uid = int(sys.Uid)
h.Gid = int(sys.Gid)
// TODO(bradfitz): populate username & group. os/user
// doesn't cache LookupId lookups, and lacks group
// lookup functions.
h.AccessTime = statAtime(sys)
h.ChangeTime = statCtime(sys)
// Best effort at populating Devmajor and Devminor.
if h.Typeflag == TypeChar || h.Typeflag == TypeBlock {
dev := uint64(sys.Rdev) // May be int32 or uint32
switch runtime.GOOS {
case "aix":
var major, minor uint32
major = uint32((dev & 0x3fffffff00000000) >> 32)
minor = uint32((dev & 0x00000000ffffffff) >> 0)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "linux":
// Copied from golang.org/x/sys/unix/dev_linux.go.
major := uint32((dev & 0x00000000000fff00) >> 8)
major |= uint32((dev & 0xfffff00000000000) >> 32)
minor := uint32((dev & 0x00000000000000ff) >> 0)
minor |= uint32((dev & 0x00000ffffff00000) >> 12)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "darwin":
// Copied from golang.org/x/sys/unix/dev_darwin.go.
major := uint32((dev >> 24) & 0xff)
minor := uint32(dev & 0xffffff)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "dragonfly":
// Copied from golang.org/x/sys/unix/dev_dragonfly.go.
major := uint32((dev >> 8) & 0xff)
minor := uint32(dev & 0xffff00ff)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "freebsd":
// Copied from golang.org/x/sys/unix/dev_freebsd.go.
major := uint32((dev >> 8) & 0xff)
minor := uint32(dev & 0xffff00ff)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "netbsd":
// Copied from golang.org/x/sys/unix/dev_netbsd.go.
major := uint32((dev & 0x000fff00) >> 8)
minor := uint32((dev & 0x000000ff) >> 0)
minor |= uint32((dev & 0xfff00000) >> 12)
h.Devmajor, h.Devminor = int64(major), int64(minor)
case "openbsd":
// Copied from golang.org/x/sys/unix/dev_openbsd.go.
major := uint32((dev & 0x0000ff00) >> 8)
minor := uint32((dev & 0x000000ff) >> 0)
minor |= uint32((dev & 0xffff0000) >> 8)
h.Devmajor, h.Devminor = int64(major), int64(minor)
default:
// TODO: Implement solaris (see https://golang.org/issue/8106)
}
}
return nil
}