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exec.go
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exec.go
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package k8s
import (
"context"
"errors"
"fmt"
"io"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/remotecommand"
"k8s.io/kubectl/pkg/scheme"
"github.com/tilt-dev/tilt/internal/container"
)
func (k *K8sClient) Exec(_ context.Context, podID PodID, cName container.Name, n Namespace, cmd []string, stdin io.Reader, stdout io.Writer, stderr io.Writer) error {
req := k.core.RESTClient().Post().
Resource("pods").
Namespace(n.String()).
Name(podID.String()).
SubResource("exec").
Param("container", cName.String())
req.VersionedParams(&corev1.PodExecOptions{
Container: cName.String(),
Command: cmd,
Stdin: stdin != nil,
Stdout: stdout != nil,
Stderr: stderr != nil,
}, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(k.restConfig, "POST", req.URL())
if err != nil {
return fmt.Errorf("establishing connection: %w", err)
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
})
if err != nil {
if err.Error() == "" {
// Executor::Stream() attempts to decode metav1.Status errors to
// handle non-zero exit codes from commands; unfortunately, for
// all _other_ failure cases, the error returned is the `Message`
// field, which might be empty and there's no way for us to further
// introspect at this point, so a generic message is the best we
// can do here
return errors.New("unknown server failure")
}
return err
}
return nil
}