Merge pull request #27562 from 7ing/ipt

Automatic merge from submit-queue

improve iptables-restore implementation #27559

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fixes #27559
- improve restoreInternal implementation in iptables
- add SetStdin and SetStdout functions to Cmd interface
- modify kubelet/prober and some tests in order to work with Cmd interface

pkg/util/exec/exec.go

@@ -17,6 +17,7 @@ limitations under the License.
 package exec
 
 import (
+	"io"
 	osexec "os/exec"
 	"syscall"
 )
@@ -45,6 +46,8 @@ type Cmd interface {
 	// Output runs the command and returns standard output, but not standard err
 	Output() ([]byte, error)
 	SetDir(dir string)
+	SetStdin(in io.Reader)
+	SetStdout(out io.Writer)
 }
 
 // ExitError is an interface that presents an API similar to os.ProcessState, which is
@@ -82,6 +85,14 @@ func (cmd *cmdWrapper) SetDir(dir string) {
 	cmd.Dir = dir
 }
 
+func (cmd *cmdWrapper) SetStdin(in io.Reader) {
+	cmd.Stdin = in
+}
+
+func (cmd *cmdWrapper) SetStdout(out io.Writer) {
+	cmd.Stdout = out
+}
+
 // CombinedOutput is part of the Cmd interface.
 func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
 	out, err := (*osexec.Cmd)(cmd).CombinedOutput()