pkg/updateengine/update_engine_client.go

// Copyright 2022 Google LLC
//
// 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 updateengine

import (
	"bytes"
	"fmt"
	"github.com/golang/glog"
	"os/exec"
)

// UpdateEngineStatus is used to get the status of update engine if auto updates
// are enabled in the instance.
func UpdateEngineStatus(updateEngineCmd string) ([]byte, error) {
	cmd := exec.Command(updateEngineCmd, "--status")
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	if err := cmd.Run(); err != nil {
		return nil, fmt.Errorf("unable to get update-engine status: %s", err)
	}

	if stderr.String() != "" {
		glog.Errorf("error from update_engine_client: %v", stderr.String())
	}

	return stdout.Bytes(), nil
}