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updater_manager_others.go
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/
updater_manager_others.go
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// Copyright observIQ, Inc.
//
// 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.
//go:build !windows
package observiq
import (
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"syscall"
"time"
"go.uber.org/zap"
)
// Ensure interface is satisfied
var _ updaterManager = (*othersUpdaterManager)(nil)
const defaultOthersUpdaterName = "updater"
// othersUpdaterManager handles starting a Updater binary and watching it for failure with a timeout
type othersUpdaterManager struct {
tmpPath string
cwd string
updaterName string
logger *zap.Logger
shutdownWaitTimeout time.Duration
}
// newUpdaterManager creates a new UpdaterManager
func newUpdaterManager(defaultLogger *zap.Logger, tmpPath string) (updaterManager, error) {
cwd, err := os.Getwd()
if err != nil {
return nil, fmt.Errorf("failed to get cwd: %w", err)
}
return &othersUpdaterManager{
tmpPath: filepath.Clean(tmpPath),
logger: defaultLogger.Named("updater manager"),
updaterName: defaultOthersUpdaterName,
cwd: cwd,
shutdownWaitTimeout: defaultShutdownWaitTimeout,
}, nil
}
// StartAndMonitorUpdater will start the Updater binary and wait to see if it finishes unexpectedly.
// While waiting for Updater, it should kill the collector and we should never execute any code past running it
func (m othersUpdaterManager) StartAndMonitorUpdater() error {
initialUpdaterPath := filepath.Join(m.tmpPath, updaterDir, m.updaterName)
updaterPath, err := copyExecutable(m.logger.Named("copy-executable"), initialUpdaterPath, m.cwd)
if err != nil {
return fmt.Errorf("failed to copy updater to cwd: %w", err)
}
//#nosec G204 -- paths are not determined via user input
cmd := exec.Command(updaterPath)
// We need to set the processor group id to something different so that at least on mac, when the
// collector dies the updater won't die as well
cmd.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
Pgid: 0,
}
// Start does not block
if err := cmd.Start(); err != nil {
return fmt.Errorf("updater had an issue while starting: %w", err)
}
// See if we're still alive after waiting for the timeout to pass
time.Sleep(m.shutdownWaitTimeout)
// Updater might already be killed
if err := cmd.Process.Kill(); err != nil {
m.logger.Debug("Failed to kill failed Updater", zap.Error(err))
}
// Ideally we should not get here as we will be killed by the updater.
// Updater should either exit before us with error or we die before it does.
return errors.New("updater failed to update collector")
}