105 lines
3.3 KiB
Go
105 lines
3.3 KiB
Go
package archive
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import (
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"archive/tar"
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/containerd/containerd/sys"
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)
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// tarName 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 tarName(p string) (string, error) {
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// windows: convert windows style relative path with backslashes
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// into forward slashes. Since windows does not allow '/' or '\'
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// in file names, it is mostly safe to replace however we must
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// check just in case
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if strings.Contains(p, "/") {
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return "", fmt.Errorf("Windows path contains forward slash: %s", p)
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}
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return strings.Replace(p, string(os.PathSeparator), "/", -1), nil
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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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perm &= 0755
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// Add the x bit: make everything +x from windows
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perm |= 0111
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return perm
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}
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func setHeaderForSpecialDevice(*tar.Header, string, os.FileInfo) error {
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// do nothing. no notion of Rdev, Inode, Nlink in stat on Windows
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return nil
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}
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func open(p string) (*os.File, error) {
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// We use sys.OpenSequential to ensure we use sequential file
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// access on Windows to avoid depleting the standby list.
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return sys.OpenSequential(p)
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}
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func openFile(name string, flag int, perm os.FileMode) (*os.File, error) {
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// Source is regular file. We use sys.OpenFileSequential to use sequential
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// file access to avoid depleting the standby list on Windows.
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return sys.OpenFileSequential(name, flag, perm)
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}
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func mkdirAll(path string, perm os.FileMode) error {
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return sys.MkdirAll(path, perm)
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}
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func prepareApply() func() {
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// No umask or filesystem changes needed before apply
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return func() {}
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}
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func skipFile(hdr *tar.Header) bool {
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// Windows does not support filenames with colons in them. Ignore
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// these files. This is not a problem though (although it might
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// appear that it is). Let's suppose a client is running docker pull.
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// The daemon it points to is Windows. Would it make sense for the
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// client to be doing a docker pull Ubuntu for example (which has files
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// with colons in the name under /usr/share/man/man3)? No, absolutely
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// not as it would really only make sense that they were pulling a
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// Windows image. However, for development, it is necessary to be able
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// to pull Linux images which are in the repository.
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//
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// TODO Windows. Once the registry is aware of what images are Windows-
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// specific or Linux-specific, this warning should be changed to an error
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// to cater for the situation where someone does manage to upload a Linux
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// image but have it tagged as Windows inadvertently.
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if strings.Contains(hdr.Name, ":") {
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return true
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}
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return false
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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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return nil
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}
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func handleLChmod(hdr *tar.Header, path string, hdrInfo os.FileInfo) error {
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return nil
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}
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func getxattr(path, attr string) ([]byte, error) {
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return nil, nil
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}
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func setxattr(path, key, value string) error {
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// Return not support error, do not wrap underlying not supported
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// since xattrs should not exist in windows diff archives
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return errors.New("xattrs not supported on Windows")
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}
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