mirror of https://github.com/docker/cli.git
81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package fsutil
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import (
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"archive/tar"
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"context"
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"io"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"github.com/pkg/errors"
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"github.com/tonistiigi/fsutil/types"
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)
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func WriteTar(ctx context.Context, fs FS, w io.Writer) error {
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tw := tar.NewWriter(w)
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err := fs.Walk(ctx, func(path string, fi os.FileInfo, err error) error {
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if err != nil && !errors.Is(err, os.ErrNotExist) {
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return err
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}
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stat, ok := fi.Sys().(*types.Stat)
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if !ok {
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return errors.WithStack(&os.PathError{Path: path, Err: syscall.EBADMSG, Op: "fileinfo without stat info"})
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}
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hdr, err := tar.FileInfoHeader(fi, stat.Linkname)
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if err != nil {
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return err
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}
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name := filepath.ToSlash(path)
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if fi.IsDir() && !strings.HasSuffix(name, "/") {
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name += "/"
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}
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hdr.Name = name
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hdr.Uid = int(stat.Uid)
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hdr.Gid = int(stat.Gid)
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hdr.Devmajor = stat.Devmajor
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hdr.Devminor = stat.Devminor
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hdr.Linkname = stat.Linkname
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if hdr.Linkname != "" {
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hdr.Size = 0
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if fi.Mode()&os.ModeSymlink != 0 {
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hdr.Typeflag = tar.TypeSymlink
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} else {
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hdr.Typeflag = tar.TypeLink
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}
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}
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if len(stat.Xattrs) > 0 {
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hdr.PAXRecords = map[string]string{}
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}
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for k, v := range stat.Xattrs {
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hdr.PAXRecords["SCHILY.xattr."+k] = string(v)
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}
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if err := tw.WriteHeader(hdr); err != nil {
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return errors.Wrapf(err, "failed to write file header %s", name)
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}
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if hdr.Typeflag == tar.TypeReg && hdr.Size > 0 && hdr.Linkname == "" {
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rc, err := fs.Open(path)
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if err != nil {
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return err
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}
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if _, err := io.Copy(tw, rc); err != nil {
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return errors.WithStack(err)
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}
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if err := rc.Close(); err != nil {
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return errors.WithStack(err)
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}
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}
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return nil
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})
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if err != nil {
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return err
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}
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return tw.Close()
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}
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