/
copy.go
151 lines (127 loc) · 3.57 KB
/
copy.go
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package ran
import (
"archive/tar"
"context"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"k8s.io/client-go/tools/remotecommand"
)
func (o *Options) copyToPod(ctx context.Context, src, dst, pod string) error {
if _, err := os.Stat(src); err != nil {
o.Info("skipping copy of %q to pod: %v", src, err)
return nil
}
cmdArr := []string{"tar", "-xmf", "-"}
if strings.HasPrefix(dst, "/") {
cmdArr = append(cmdArr, "-C", "/")
dst = dst[1:]
}
reader, writer := io.Pipe()
go func() {
defer writer.Close()
if err := o.makeTar(src, dst, writer); err != nil {
o.Warn("unable to tar local files %q: %v", src, err)
}
}()
return o.executor.execute(pod, o.namespace, cmdArr,
remotecommand.StreamOptions{Stdin: reader, Stdout: o.Out, Stderr: o.ErrOut})
}
func (o *Options) copyFromPod(ctx context.Context, src, dst, pod string) error {
cmdArr := []string{"tar", "cf", "-"}
src = strings.TrimPrefix(src, "/")
reader, outStream := io.Pipe()
go func() {
defer outStream.Close()
if err := o.executor.execute(pod, o.namespace, append(cmdArr, src),
remotecommand.StreamOptions{Stdout: outStream, Stderr: o.ErrOut}); err != nil {
o.Warn("unable to tar pod files %q: %v", src, err)
}
}()
return o.untarAll(src, dst, reader)
}
func (o *Options) makeTar(src, dst string, writer io.Writer) error {
src, dst = filepath.Clean(src), filepath.Clean(dst)
o.Info("copy from local %q to remote %v", src, dst)
tw := tar.NewWriter(writer)
defer tw.Close()
err := filepath.Walk(src, func(file string, fi os.FileInfo, err error) error {
if err != nil {
o.Warn("unable to walk directory %q: %v", file, err)
}
header, err := tar.FileInfoHeader(fi, file)
if err != nil {
return err
}
// rewrite for destination path
header.Name = dst + strings.TrimPrefix(file, src)
o.Info("%q -> %q", file, header.Name)
// write header
if err := tw.WriteHeader(header); err != nil {
return err
}
// if not a dir, write file content
if !fi.IsDir() {
data, err := os.Open(file)
if err != nil {
return err
}
if _, err := io.Copy(tw, data); err != nil {
return err
}
}
return nil
})
if err != nil {
o.Warn("failures while adding to tar: %v", err)
}
if err := tw.Close(); err != nil {
return fmt.Errorf("unable to close tar: %w", err)
}
return nil
}
func (o *Options) untarAll(src, dst string, reader io.Reader) error {
src, dst = filepath.Clean(src), filepath.Clean(dst)
o.Info("copy from remote %q to local %q", src, dst)
tr := tar.NewReader(reader)
for {
header, err := tr.Next()
if err != nil {
if err != io.EOF {
return err
}
break
}
if filepath.IsAbs(header.Name) {
return fmt.Errorf("unexpected tar format, leading '/' was not removed for %q", header.Name)
}
// rewrite for destination path
file := dst + strings.TrimPrefix(header.Name, src)
o.Info("%q -> %q", header.Name, file)
if header.FileInfo().IsDir() {
if err := os.MkdirAll(file, 0755); err != nil {
return fmt.Errorf("error untaring directory %q: %w", file, err)
}
continue
}
if header.FileInfo().Mode()&os.ModeSymlink != 0 {
o.Warn("skipping symlink: %q -> %q", file, header.Linkname)
continue
}
outFile, err := os.Create(file)
if err != nil {
return fmt.Errorf("unable to create local file %q: %w", file, err)
}
// Ensure closed in case of other errors.
defer outFile.Close()
if _, err := io.Copy(outFile, tr); err != nil {
return fmt.Errorf("error untaring file %q: %w", file, err)
}
if err := outFile.Close(); err != nil {
return fmt.Errorf("error closing file %q: %w", file, err)
}
}
return nil
}