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