func cmdDaemon(c *cli.Context) {
app := beam.NewServer()
app.OnLog(beam.Handler(func(msg *beam.Message) error {
utils.Debugf("%s", strings.Join(msg.Args, " "))
return nil
}))
app.OnError(beam.Handler(func(msg *beam.Message) error {
Fatalf("Fatal: %v", strings.Join(msg.Args[:1], ""))
return nil
}))
backend := beam.Object{backends.Forward()}
dockerHost := os.Getenv("DOCKER_HOST")
if dockerHost == "" {
dockerHost = "unix:///var/run/docker.sock"
}
instance, err := backend.Spawn(dockerHost)
if err != nil {
Fatalf("spawn: %v\n", err)
}
instanceR, instanceW, err := instance.Attach("")
if err != nil {
Fatalf("attach: %v", err)
}
defer instanceW.Close()
go beam.Copy(app, instanceR)
if err := instance.Start(); err != nil {
Fatalf("start: %v", err)
}
err = doCmd(instance, c.Args())
if err != nil {
Fatalf("%v", err)
}
}
func doCmd(instance *beam.Object, args []string) error {
if len(args) == 0 {
return fmt.Errorf("no command supplied")
}
if args[0] == "ps" {
if len(args) != 1 {
return fmt.Errorf("usage: ps")
}
names, err := instance.Ls()
if err != nil {
return err
}
fmt.Println(strings.Join(names, "\n"))
return nil
}
if args[0] == "run" {
if len(args) < 3 {
return fmt.Errorf("usage: run IMAGE COMMAND...")
}
containerJson, err := json.Marshal(&runconfig.Config{
Image: args[1],
Cmd: args[2:],
AttachStdin: false,
AttachStdout: true,
AttachStderr: true,
})
if err != nil {
return err
}
container, err := instance.Spawn(string(containerJson))
if err != nil {
return fmt.Errorf("spawn: %v", err)
}
logs, _, err := container.Attach("")
if err != nil {
return fmt.Errorf("attach: %v", err)
}
if err = container.Start(); err != nil {
return fmt.Errorf("start: %v", err)
}
for {
msg, err := logs.Receive(beam.Ret)
if err != nil {
if err.Error() == "EOF" {
break
}
return fmt.Errorf("error reading from container: %v", err)
}
if msg.Verb != beam.Log {
return fmt.Errorf("unexpected message reading from container: %v", msg)
}
if len(msg.Args) != 2 {
return fmt.Errorf("expected exactly 2 args to log message, got %d", len(msg.Args))
}
tag, chunk := msg.Args[0], msg.Args[1]
var stream io.Writer
if tag == "stdout" {
stream = os.Stdout
} else if tag == "stderr" {
stream = os.Stderr
} else {
return fmt.Errorf("unrecognised tag: %s", tag)
}
fmt.Fprint(stream, chunk)
}
return nil
}
if args[0] == "inspect" {
if len(args) != 2 {
return fmt.Errorf("usage: inspect CONTAINER")
}
_, container, err := instance.Attach(args[1])
if err != nil {
return fmt.Errorf("attach: %v", err)
}
json, err := container.Get()
if err != nil {
return fmt.Errorf("get: %v", err)
}
fmt.Println(json)
return nil
}
return fmt.Errorf("unrecognised command: %s", args[0])
}