package images import ( "io" "io/ioutil" "os" "path/filepath" "github.com/pkg/errors" "github.com/sirupsen/logrus" "golang.org/x/sys/unix" ) // setupPipe for fixing https://github.com/containers/podman/issues/7017 // uses named pipe since containers/image EvalSymlinks fails with /dev/stdout // the caller should use the returned function to clean up the pipeDir func setupPipe() (string, func() <-chan error, error) { errc := make(chan error) pipeDir, err := ioutil.TempDir(os.TempDir(), "pipeDir") if err != nil { return "", nil, err } pipePath := filepath.Join(pipeDir, "saveio") err = unix.Mkfifo(pipePath, 0600) if err != nil { if e := os.RemoveAll(pipeDir); e != nil { logrus.Errorf("Removing named pipe: %q", e) } return "", nil, errors.Wrapf(err, "error creating named pipe") } go func() { fpipe, err := os.Open(pipePath) if err != nil { errc <- err return } _, err = io.Copy(os.Stdout, fpipe) fpipe.Close() errc <- err }() return pipePath, func() <-chan error { if e := os.RemoveAll(pipeDir); e != nil { logrus.Errorf("Removing named pipe: %q", e) } return errc }, nil }