dotcloud/docker

package main

import (
    "context"
    "io"

    "github.com/Microsoft/go-winio/pkg/etwlogrus"
    "github.com/containerd/log"
)

func runDaemon(ctx context.Context, cli *daemonCLI) error {
    // On Windows, this may be launching as a service or with an option to
    // register the service.
    stop, runAsService, err := initService(cli)
    if err != nil {
        return err
    }

    if stop {
        return nil
    }

    if runAsService {
        // If Windows SCM manages the service - no need for PID files
        cli.Config.Pidfile = ""
    }

    err = cli.start(ctx)
    notifyShutdown(err)
    return err
}

func initLogging(stdout, _ io.Writer) {
    // Maybe there is a historic reason why on non-Windows, stderr is used
    // for output. However, on Windows it makes no sense and there is no need.
    log.L.Logger.SetOutput(stdout)

    // Provider ID: {6996f090-c5de-5082-a81e-5841acc3a635}
    // Hook isn't closed explicitly, as it will exist until process exit.
    // GUID is generated based on name - see Microsoft/go-winio/tools/etw-provider-gen.
    if hook, err := etwlogrus.NewHook("Moby"); err == nil {
        log.L.Logger.AddHook(hook)
    }
    return
}