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docker.go
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docker.go
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package main
import (
"fmt"
"os"
"path/filepath"
"runtime"
"github.com/docker/docker/cli"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/pkg/reexec"
"github.com/docker/docker/pkg/term"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
func newDaemonCommand() *cobra.Command {
opts := newDaemonOptions(config.New())
cmd := &cobra.Command{
Use: "dockerd [OPTIONS]",
Short: "A self-sufficient runtime for containers.",
SilenceUsage: true,
SilenceErrors: true,
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
opts.flags = cmd.Flags()
return runDaemon(opts)
},
}
cli.SetupRootCommand(cmd)
flags := cmd.Flags()
flags.BoolVarP(&opts.version, "version", "v", false, "Print version information and quit")
flags.StringVar(&opts.configFile, "config-file", defaultDaemonConfigFile, "Daemon configuration file")
opts.InstallFlags(flags)
installConfigFlags(opts.daemonConfig, flags)
installServiceFlags(flags)
return cmd
}
func runDaemon(opts *daemonOptions) error {
if opts.version {
showVersion()
return nil
}
daemonCli := NewDaemonCli()
// Windows specific settings as these are not defaulted.
if runtime.GOOS == "windows" {
if opts.daemonConfig.Pidfile == "" {
opts.daemonConfig.Pidfile = filepath.Join(opts.daemonConfig.Root, "docker.pid")
}
if opts.configFile == "" {
opts.configFile = filepath.Join(opts.daemonConfig.Root, `config\daemon.json`)
}
}
// On Windows, this may be launching as a service or with an option to
// register the service.
stop, runAsService, err := initService(daemonCli)
if err != nil {
logrus.Fatal(err)
}
if stop {
return nil
}
// If Windows SCM manages the service - no need for PID files
if runAsService {
opts.daemonConfig.Pidfile = ""
}
err = daemonCli.start(opts)
notifyShutdown(err)
return err
}
func showVersion() {
fmt.Printf("Docker version %s, build %s\n", dockerversion.Version, dockerversion.GitCommit)
}
func main() {
if reexec.Init() {
return
}
// Set terminal emulation based on platform as required.
_, stdout, stderr := term.StdStreams()
// @jhowardmsft - maybe there is a historic reason why on non-Windows, stderr is used
// here. However, on Windows it makes no sense and there is no need.
if runtime.GOOS == "windows" {
logrus.SetOutput(stdout)
} else {
logrus.SetOutput(stderr)
}
cmd := newDaemonCommand()
cmd.SetOutput(stdout)
if err := cmd.Execute(); err != nil {
fmt.Fprintf(stderr, "%s\n", err)
os.Exit(1)
}
}