/
exec.go
64 lines (55 loc) · 1.78 KB
/
exec.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
/*
Copyright 2022 k0s authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package exec
import (
"bytes"
"context"
"fmt"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
// PodExecCmdOutput exec command on specific pod and wait the command's output.
func PodExecCmdOutput(ctx context.Context, client kubernetes.Interface, config *restclient.Config, podName, namespace string, command string) (string, error) {
cmd := []string{
"/bin/sh",
"-c",
command,
}
req := client.CoreV1().RESTClient().Post().Resource("pods").Name(podName).Namespace(namespace).SubResource("exec")
option := &v1.PodExecOptions{
Command: cmd,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
Container: "controller",
}
req.VersionedParams(option, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL())
if err != nil {
return "", err
}
var stdout bytes.Buffer
var stderr bytes.Buffer
err = exec.StreamWithContext(ctx, remotecommand.StreamOptions{
Stdout: &stdout,
Stderr: &stderr,
})
if err != nil {
return stdout.String(), fmt.Errorf("failed to exec command: %w, stderr: %s", err, stderr.String())
}
return stdout.String(), nil
}