1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
//go:build !windows
// +build !windows
package archive // import "github.com/docker/docker/pkg/archive"
import (
"archive/tar"
"errors"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/containerd/containerd/pkg/userns"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/system"
"golang.org/x/sys/unix"
)
func init() {
sysStat = statUnix
}
// fixVolumePathPrefix does platform specific processing to ensure that if
// the path being passed in is not in a volume path format, convert it to one.
func fixVolumePathPrefix(srcPath string) string {
return srcPath
}
// getWalkRoot calculates the root path when performing a TarWithOptions.
// We use a separate function as this is platform specific. On Linux, we
// can't use filepath.Join(srcPath,include) because this will clean away
// a trailing "." or "/" which may be important.
func getWalkRoot(srcPath string, include string) string {
return strings.TrimSuffix(srcPath, string(filepath.Separator)) + string(filepath.Separator) + include
}
// chmodTarEntry is used to adjust the file permissions used in tar header based
// on the platform the archival is done.
func chmodTarEntry(perm os.FileMode) os.FileMode {
return perm // noop for unix as golang APIs provide perm bits correctly
}
// statUnix populates hdr from system-dependent fields of fi without performing
// any OS lookups.
func statUnix(fi os.FileInfo, hdr *tar.Header) error {
s, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
return nil
}
hdr.Uid = int(s.Uid)
hdr.Gid = int(s.Gid)
if s.Mode&unix.S_IFBLK != 0 ||
s.Mode&unix.S_IFCHR != 0 {
hdr.Devmajor = int64(unix.Major(uint64(s.Rdev))) //nolint: unconvert
hdr.Devminor = int64(unix.Minor(uint64(s.Rdev))) //nolint: unconvert
}
return nil
}
func getInodeFromStat(stat interface{}) (inode uint64, err error) {
s, ok := stat.(*syscall.Stat_t)
if ok {
inode = s.Ino
}
return
}
func getFileUIDGID(stat interface{}) (idtools.Identity, error) {
s, ok := stat.(*syscall.Stat_t)
if !ok {
return idtools.Identity{}, errors.New("cannot convert stat value to syscall.Stat_t")
}
return idtools.Identity{UID: int(s.Uid), GID: int(s.Gid)}, nil
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
mode := uint32(hdr.Mode & 07777)
switch hdr.Typeflag {
case tar.TypeBlock:
mode |= unix.S_IFBLK
case tar.TypeChar:
mode |= unix.S_IFCHR
case tar.TypeFifo:
mode |= unix.S_IFIFO
}
err := system.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor)))
if errors.Is(err, syscall.EPERM) && userns.RunningInUserNS() {
// In most cases, cannot create a device if running in user namespace
err = nil
}
return err
}
func handleLChmod(hdr *tar.Header, path string, hdrInfo os.FileInfo) error {
if hdr.Typeflag == tar.TypeLink {
if fi, err := os.Lstat(hdr.Linkname); err == nil && (fi.Mode()&os.ModeSymlink == 0) {
if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
return err
}
}
} else if hdr.Typeflag != tar.TypeSymlink {
if err := os.Chmod(path, hdrInfo.Mode()); err != nil {
return err
}
}
return nil
}
|
