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//go:build !windows
package archive
import (
"archive/tar"
"errors"
"os"
"path/filepath"
"strings"
"syscall"
"golang.org/x/sys/unix"
)
// addLongPathPrefix adds the Windows long path prefix to the path provided if
// it does not already have it. It is a no-op on platforms other than Windows.
func addLongPathPrefix(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
}
func getInodeFromStat(stat interface{}) (uint64, error) {
s, ok := stat.(*syscall.Stat_t)
if !ok {
// FIXME(thaJeztah): this should likely return an error; see https://github.com/moby/moby/pull/49493#discussion_r1979152897
return 0, nil
}
return s.Ino, nil
}
func getFileUIDGID(stat interface{}) (int, int, error) {
s, ok := stat.(*syscall.Stat_t)
if !ok {
return 0, 0, errors.New("cannot convert stat value to syscall.Stat_t")
}
return int(s.Uid), int(s.Gid), nil
}
// handleTarTypeBlockCharFifo is an OS-specific helper function used by
// createTarFile to handle the following types of header: Block; Char; Fifo.
//
// Creating device nodes is not supported when running in a user namespace,
// produces a [syscall.EPERM] in most cases.
func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
mode := uint32(hdr.Mode & 0o7777)
switch hdr.Typeflag {
case tar.TypeBlock:
mode |= unix.S_IFBLK
case tar.TypeChar:
mode |= unix.S_IFCHR
case tar.TypeFifo:
mode |= unix.S_IFIFO
}
return mknod(path, mode, unix.Mkdev(uint32(hdr.Devmajor), uint32(hdr.Devminor)))
}
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
}
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