137 lines
3.6 KiB
Go
137 lines
3.6 KiB
Go
//go:build !windows
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package archive
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import (
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"archive/tar"
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"errors"
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"os"
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"path/filepath"
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"syscall"
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"github.com/containers/storage/pkg/idtools"
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"github.com/containers/storage/pkg/system"
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"golang.org/x/sys/unix"
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)
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func init() {
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sysStatOverride = statUnix
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}
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// statUnix populates hdr from system-dependent fields of fi without performing
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// any OS lookups.
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// Adapted from Moby.
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func statUnix(fi os.FileInfo, hdr *tar.Header) error {
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s, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return nil
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}
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hdr.Uid = int(s.Uid)
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hdr.Gid = int(s.Gid)
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if s.Mode&unix.S_IFBLK != 0 ||
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s.Mode&unix.S_IFCHR != 0 {
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hdr.Devmajor = int64(unix.Major(uint64(s.Rdev))) //nolint: unconvert
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hdr.Devminor = int64(unix.Minor(uint64(s.Rdev))) //nolint: unconvert
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}
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return nil
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}
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// fixVolumePathPrefix does platform specific processing to ensure that if
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// the path being passed in is not in a volume path format, convert it to one.
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func fixVolumePathPrefix(srcPath string) string {
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return srcPath
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}
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// getWalkRoot calculates the root path when performing a TarWithOptions.
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// We use a separate function as this is platform specific. On Linux, we
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// can't use filepath.Join(srcPath,include) because this will clean away
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// a trailing "." or "/" which may be important.
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func getWalkRoot(srcPath string, include string) string {
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return srcPath + string(filepath.Separator) + include
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}
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// CanonicalTarNameForPath returns platform-specific filepath
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// to canonical posix-style path for tar archival. p is relative
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// path.
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func CanonicalTarNameForPath(p string) (string, error) {
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return p, nil // already unix-style
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}
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// chmodTarEntry is used to adjust the file permissions used in tar header based
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// on the platform the archival is done.
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func chmodTarEntry(perm os.FileMode) os.FileMode {
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return perm // noop for unix as golang APIs provide perm bits correctly
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}
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func setHeaderForSpecialDevice(hdr *tar.Header, name string, stat any) (err error) {
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s, ok := stat.(*syscall.Stat_t)
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if ok {
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// Currently go does not fill in the major/minors
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if s.Mode&unix.S_IFBLK != 0 ||
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s.Mode&unix.S_IFCHR != 0 {
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hdr.Devmajor = int64(major(uint64(s.Rdev))) //nolint: unconvert
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hdr.Devminor = int64(minor(uint64(s.Rdev))) //nolint: unconvert
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}
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}
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return
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}
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func getInodeFromStat(stat any) (inode uint64, err error) {
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s, ok := stat.(*syscall.Stat_t)
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if ok {
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inode = s.Ino
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}
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return
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}
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func getFileUIDGID(stat any) (idtools.IDPair, error) {
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s, ok := stat.(*syscall.Stat_t)
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if !ok {
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return idtools.IDPair{}, errors.New("cannot convert stat value to syscall.Stat_t")
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}
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return idtools.IDPair{UID: int(s.Uid), GID: int(s.Gid)}, nil
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}
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func major(device uint64) uint64 {
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return (device >> 8) & 0xfff
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}
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func minor(device uint64) uint64 {
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return (device & 0xff) | ((device >> 12) & 0xfff00)
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}
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// handleTarTypeBlockCharFifo is an OS-specific helper function used by
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// createTarFile to handle the following types of header: Block; Char; Fifo
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func handleTarTypeBlockCharFifo(hdr *tar.Header, path string) error {
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mode := uint32(hdr.Mode & 0o7777)
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switch hdr.Typeflag {
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case tar.TypeBlock:
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mode |= unix.S_IFBLK
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case tar.TypeChar:
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mode |= unix.S_IFCHR
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case tar.TypeFifo:
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mode |= unix.S_IFIFO
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}
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return system.Mknod(path, mode, system.Mkdev(hdr.Devmajor, hdr.Devminor))
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}
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// Hardlink without symlinks
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func handleLLink(targetPath, path string) error {
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// Note: on Linux, the link syscall will not follow symlinks.
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// This behavior is implementation-dependent since
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// POSIX.1-2008 so to make it clear that we need non-symlink
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// following here we use the linkat syscall which has a flags
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// field to select symlink following or not.
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return unix.Linkat(unix.AT_FDCWD, targetPath, unix.AT_FDCWD, path, 0)
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}
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