/
nstar.go
87 lines (71 loc) · 1.87 KB
/
nstar.go
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package rundmc
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"strings"
"code.cloudfoundry.org/commandrunner"
"code.cloudfoundry.org/lager/v3"
)
type nstar struct {
NstarBinPath string
TarBinPath string
CommandRunner commandrunner.CommandRunner
}
func NewNstarRunner(nstarPath, tarPath string, runner commandrunner.CommandRunner) NstarRunner {
return &nstar{
NstarBinPath: nstarPath,
TarBinPath: tarPath,
CommandRunner: runner,
}
}
func (n *nstar) StreamIn(logger lager.Logger, pid int, path, user string, tarStream io.Reader) error {
buff := new(bytes.Buffer)
cmd := exec.Command(n.NstarBinPath, n.TarBinPath, fmt.Sprintf("%d", pid), n.streamUser(user), path)
cmd.Stdout = buff
cmd.Stderr = buff
cmd.Stdin = tarStream
if err := n.CommandRunner.Run(cmd); err != nil {
return fmt.Errorf("error streaming in: %v. Output: %s", err, buff.String())
}
return nil
}
func (n *nstar) StreamOut(log lager.Logger, pid int, path, user string) (io.ReadCloser, error) {
sourcePath := filepath.Dir(path)
compressPath := filepath.Base(path)
if strings.HasSuffix(path, "/") {
sourcePath = path
compressPath = "."
}
errOut := new(bytes.Buffer)
reader, writer, err := os.Pipe()
if err != nil {
return nil, err
}
cmd := exec.Command(n.NstarBinPath, n.TarBinPath, fmt.Sprintf("%d", pid), n.streamUser(user), sourcePath, compressPath)
cmd.Stdout = writer
cmd.Stderr = errOut
if err := n.CommandRunner.Background(cmd); err != nil {
return nil, fmt.Errorf("error streaming out: %v. Output: %s", err, errOut.String())
}
writer.Close()
go func() {
if err := n.CommandRunner.Wait(cmd); err != nil {
log.Error("wait", err, lager.Data{
"pid": pid,
"path": path,
"user": user,
"stdout": errOut.String()})
}
}()
return reader, nil
}
func (n *nstar) streamUser(usr string) string {
if usr == "" {
usr = "root"
}
return usr
}