mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
// +build !windows
|
|
|
|
package archive
|
|
|
|
import (
|
|
"archive/tar"
|
|
"errors"
|
|
"os"
|
|
"syscall"
|
|
|
|
"github.com/docker/docker/pkg/system"
|
|
)
|
|
|
|
// canonicalTarNameForPath returns platform-specific filepath
|
|
// to canonical posix-style path for tar archival. p is relative
|
|
// path.
|
|
func CanonicalTarNameForPath(p string) (string, error) {
|
|
return p, nil // already unix-style
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
func setHeaderForSpecialDevice(hdr *tar.Header, ta *tarAppender, name string, stat interface{}) (nlink uint32, inode uint64, err error) {
|
|
s, ok := stat.(*syscall.Stat_t)
|
|
|
|
if !ok {
|
|
err = errors.New("cannot convert stat value to syscall.Stat_t")
|
|
return
|
|
}
|
|
|
|
nlink = uint32(s.Nlink)
|
|
inode = uint64(s.Ino)
|
|
|
|
// Currently go does not fil in the major/minors
|
|
if s.Mode&syscall.S_IFBLK != 0 ||
|
|
s.Mode&syscall.S_IFCHR != 0 {
|
|
hdr.Devmajor = int64(major(uint64(s.Rdev)))
|
|
hdr.Devminor = int64(minor(uint64(s.Rdev)))
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func major(device uint64) uint64 {
|
|
return (device >> 8) & 0xfff
|
|
}
|
|
|
|
func minor(device uint64) uint64 {
|
|
return (device & 0xff) | ((device >> 12) & 0xfff00)
|
|
}
|
|
|
|
// 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 |= syscall.S_IFBLK
|
|
case tar.TypeChar:
|
|
mode |= syscall.S_IFCHR
|
|
case tar.TypeFifo:
|
|
mode |= syscall.S_IFIFO
|
|
}
|
|
|
|
if err := system.Mknod(path, mode, int(system.Mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
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
|
|
}
|