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kubeCtlBuilder.go
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kubeCtlBuilder.go
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package main
import (
"bytes"
"fmt"
"log"
"os/exec"
"strings"
"time"
)
type kubectlBuilder struct {
cmd *exec.Cmd
timeout <-chan time.Time
}
func NewKubectlCommand(args ...string) *kubectlBuilder {
b := new(kubectlBuilder)
b.cmd = KubectlCmd(args...)
return b
}
func RunHostCmd(namespace, name, cmd string) (string, error) {
return RunKubectl("exec", fmt.Sprintf("--namespace=%v", namespace), name, "--", "/bin/sh", "-c", cmd)
}
func RunKubectl(args ...string) (string, error) {
return NewKubectlCommand(args...).Exec()
}
func KubectlCmd(args ...string) *exec.Cmd {
cmd := exec.Command("kubectl", args...)
return cmd
}
func (b kubectlBuilder) Exec() (string, error) {
var stdout, stderr bytes.Buffer
cmd := b.cmd
cmd.Stdout, cmd.Stderr = &stdout, &stderr
log.Printf("Running '%s %s'", cmd.Path, strings.Join(cmd.Args[1:], " ")) // skip arg[0] as it is printed separately
if err := cmd.Start(); err != nil {
return "", fmt.Errorf("Error starting %v: \n Command stdout: \n %v \n stderr: \n %v \n error: \n %v \n", cmd, cmd.Stdout, cmd.Stderr, err)
}
errCh := make(chan error, 1)
go func() {
errCh <- cmd.Wait()
}()
select {
case err := <-errCh:
if err != nil {
return "", fmt.Errorf("Error running %v:\nCommand stdout: \n %v \n stderr: \n %v \n error: \n %v \n", cmd, cmd.Stdout, cmd.Stderr, err)
}
case <-b.timeout:
b.cmd.Process.Kill()
return "", fmt.Errorf("Timed out waiting for command %v: \n Command stdout: \n %v \n stderr: \n %v \n", cmd, cmd.Stdout, cmd.Stderr)
}
log.Printf("stderr: %q", stderr.String())
return stdout.String(), nil
}