DockerCLI/vendor/github.com/tonistiigi/fsutil/diskwriter_linux.go

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// +build linux
package fsutil
import (
"os"
"syscall"
"github.com/pkg/errors"
"github.com/stevvooe/continuity/sysx"
"golang.org/x/sys/unix"
)
func rewriteMetadata(p string, stat *Stat) error {
for key, value := range stat.Xattrs {
sysx.Setxattr(p, key, value, 0)
}
if err := os.Lchown(p, int(stat.Uid), int(stat.Gid)); err != nil {
return errors.Wrapf(err, "failed to lchown %s", p)
}
if os.FileMode(stat.Mode)&os.ModeSymlink == 0 {
if err := os.Chmod(p, os.FileMode(stat.Mode)); err != nil {
return errors.Wrapf(err, "failed to chown %s", p)
}
}
if err := chtimes(p, stat.ModTime); err != nil {
return errors.Wrapf(err, "failed to chtimes %s", p)
}
return nil
}
func chtimes(path string, un int64) error {
var utimes [2]unix.Timespec
utimes[0] = unix.NsecToTimespec(un)
utimes[1] = utimes[0]
if err := unix.UtimesNanoAt(unix.AT_FDCWD, path, utimes[0:], unix.AT_SYMLINK_NOFOLLOW); err != nil {
return errors.Wrap(err, "failed call to UtimesNanoAt")
}
return nil
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo
func handleTarTypeBlockCharFifo(path string, stat *Stat) error {
mode := uint32(stat.Mode & 07777)
if os.FileMode(stat.Mode)&os.ModeCharDevice != 0 {
mode |= syscall.S_IFCHR
} else if os.FileMode(stat.Mode)&os.ModeNamedPipe != 0 {
mode |= syscall.S_IFIFO
} else {
mode |= syscall.S_IFBLK
}
if err := syscall.Mknod(path, mode, int(mkdev(stat.Devmajor, stat.Devminor))); err != nil {
return err
}
return nil
}