78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
package cluster
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import (
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"bytes"
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"context"
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"fmt"
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"strings"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes/scheme"
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"k8s.io/client-go/tools/remotecommand"
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"github.com/zalando/postgres-operator/pkg/spec"
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"github.com/zalando/postgres-operator/pkg/util/constants"
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)
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// ExecCommand executes arbitrary command inside the pod
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func (c *Cluster) ExecCommand(podName *spec.NamespacedName, command ...string) (string, error) {
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c.setProcessName("executing command %q", strings.Join(command, " "))
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var (
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execOut bytes.Buffer
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execErr bytes.Buffer
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)
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pod, err := c.KubeClient.Pods(podName.Namespace).Get(context.TODO(), podName.Name, metav1.GetOptions{})
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if err != nil {
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return "", fmt.Errorf("could not get pod info: %v", err)
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}
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// iterate through all containers looking for the one running PostgreSQL.
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targetContainer := -1
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for i, cr := range pod.Spec.Containers {
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if cr.Name == constants.PostgresContainerName {
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targetContainer = i
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break
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}
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}
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if targetContainer < 0 {
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return "", fmt.Errorf("could not find %s container to exec to", constants.PostgresContainerName)
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}
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req := c.KubeClient.RESTClient.Post().
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Resource("pods").
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Name(podName.Name).
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Namespace(podName.Namespace).
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SubResource("exec")
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req.VersionedParams(&v1.PodExecOptions{
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Container: pod.Spec.Containers[targetContainer].Name,
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Command: command,
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Stdout: true,
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Stderr: true,
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}, scheme.ParameterCodec)
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exec, err := remotecommand.NewSPDYExecutor(c.RestConfig, "POST", req.URL())
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if err != nil {
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return "", fmt.Errorf("failed to init executor: %v", err)
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}
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err = exec.StreamWithContext(context.TODO(), remotecommand.StreamOptions{
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Stdout: &execOut,
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Stderr: &execErr,
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Tty: false,
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})
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if err != nil {
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return "", fmt.Errorf("could not execute: %v", err)
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}
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if execErr.Len() > 0 {
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return "", fmt.Errorf("stderr: %v", execErr.String())
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}
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return execOut.String(), nil
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}
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