Implement nsinit state command

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

error.go

@@ -15,6 +15,7 @@ const (
 	ContainerNotExists
 	ContainerPaused
 	ContainerNotStopped
+	ContainerNotRunning
 
 	// Common errors
 	ConfigInvalid
@@ -36,7 +37,9 @@ func (c ErrorCode) String() string {
 	case ContainerNotExists:
 		return "Container does not exist"
 	case ContainerNotStopped:
-		return "Container isn't stopped"
+		return "Container is not stopped"
+	case ContainerNotRunning:
+		return "Container is not running"
 	default:
 		return "Unknown error"
 	}

generic_error.go

@@ -11,12 +11,14 @@ import (
 
 var errorTemplate = template.Must(template.New("error").Parse(`Timestamp: {{.Timestamp}}
 Code: {{.ECode}}
+{{if .Err }}
 Message: {{.Err.Error}}
+{{end}}
 Frames:{{range $i, $frame := .Stack.Frames}}
 ---
 {{$i}}: {{$frame.Function}}
 Package: {{$frame.Package}}
-File: {{$frame.File}}{{end}}
+File: {{$frame.File}}@{{$frame.Line}}{{end}}
 `))
 
 func newGenericError(err error, c ErrorCode) Error {
@@ -27,7 +29,7 @@ func newGenericError(err error, c ErrorCode) Error {
 		Timestamp: time.Now(),
 		Err:       err,
 		ECode:     c,
-		Stack:     stacktrace.Capture(2),
+		Stack:     stacktrace.Capture(1),
 	}
 }
 
@@ -39,7 +41,7 @@ func newSystemError(err error) Error {
 		Timestamp: time.Now(),
 		Err:       err,
 		ECode:     SystemError,
-		Stack:     stacktrace.Capture(2),
+		Stack:     stacktrace.Capture(1),
 	}
 }
 

linux_container.go

@@ -184,7 +184,6 @@ func (c *linuxContainer) commandTemplate(p *Process, childPipe *os.File) (*exec.
 
 func (c *linuxContainer) newInitProcess(p *Process, cmd *exec.Cmd, parentPipe, childPipe *os.File) *initProcess {
 	t := "_LIBCONTAINER_INITTYPE=standard"
-
 	cloneFlags := c.config.Namespaces.CloneFlags()
 	if cloneFlags&syscall.CLONE_NEWUSER != 0 {
 		c.addUidGidMappings(cmd.SysProcAttr)
@@ -225,6 +224,8 @@ func (c *linuxContainer) newInitConfig(process *Process) *initConfig {
 		Config: c.config,
 		Args:   process.Args,
 		Env:    process.Env,
+		User:   process.User,
+		Cwd:    process.Cwd,
 	}
 }
 
@@ -273,6 +274,7 @@ func (c *linuxContainer) Destroy() error {
 	if rerr := os.RemoveAll(c.root); err == nil {
 		err = rerr
 	}
+	c.initProcess = nil
 	return err
 }
 
@@ -285,6 +287,9 @@ func (c *linuxContainer) Resume() error {
 }
 
 func (c *linuxContainer) Signal(signal os.Signal) error {
+	if c.initProcess == nil {
+		return newGenericError(nil, ContainerNotRunning)
+	}
 	return c.initProcess.signal(signal)
 }
 

linux_process.go

@@ -54,15 +54,15 @@ func (p *setnsProcess) signal(s os.Signal) error {
 func (p *setnsProcess) start() (err error) {
 	defer p.parentPipe.Close()
 	if p.forkedProcess, err = p.execSetns(); err != nil {
-		return err
+		return newSystemError(err)
 	}
 	if len(p.cgroupPaths) > 0 {
 		if err := cgroups.EnterPid(p.cgroupPaths, p.forkedProcess.Pid); err != nil {
-			return err
+			return newSystemError(err)
 		}
 	}
 	if err := json.NewEncoder(p.parentPipe).Encode(p.config); err != nil {
-		return err
+		return newSystemError(err)
 	}
 	return nil
 }
@@ -75,18 +75,18 @@ func (p *setnsProcess) execSetns() (*os.Process, error) {
 	err := p.cmd.Start()
 	p.childPipe.Close()
 	if err != nil {
-		return nil, err
+		return nil, newSystemError(err)
 	}
 	status, err := p.cmd.Process.Wait()
 	if err != nil {
-		return nil, err
+		return nil, newSystemError(err)
 	}
 	if !status.Success() {
-		return nil, &exec.ExitError{status}
+		return nil, newSystemError(&exec.ExitError{status})
 	}
 	var pid *pid
 	if err := json.NewDecoder(p.parentPipe).Decode(&pid); err != nil {
-		return nil, err
+		return nil, newSystemError(err)
 	}
 	return os.FindProcess(pid.Pid)
 }
@@ -129,12 +129,12 @@ func (p *initProcess) start() error {
 	err := p.cmd.Start()
 	p.childPipe.Close()
 	if err != nil {
-		return err
+		return newSystemError(err)
 	}
 	// Do this before syncing with child so that no children
 	// can escape the cgroup
 	if err := p.manager.Apply(p.pid()); err != nil {
-		return err
+		return newSystemError(err)
 	}
 	defer func() {
 		if err != nil {
@@ -143,13 +143,13 @@ func (p *initProcess) start() error {
 		}
 	}()
 	if err := p.createNetworkInterfaces(); err != nil {
-		return err
+		return newSystemError(err)
 	}
 	// Start the setup process to setup the init process
 	if p.cmd.SysProcAttr.Cloneflags&syscall.CLONE_NEWUSER != 0 {
 		parent, err := p.newUsernsSetupProcess()
 		if err != nil {
-			return err
+			return newSystemError(err)
 		}
 		if err := parent.start(); err != nil {
 			if err := parent.terminate(); err != nil {
@@ -158,20 +158,20 @@ func (p *initProcess) start() error {
 			return err
 		}
 		if _, err := parent.wait(); err != nil {
-			return err
+			return newSystemError(err)
 		}
 	}
 	if err := p.sendConfig(); err != nil {
-		return err
+		return newSystemError(err)
 	}
 	// wait for the child process to fully complete and receive an error message
 	// if one was encoutered
 	var ierr *initError
 	if err := json.NewDecoder(p.parentPipe).Decode(&ierr); err != nil && err != io.EOF {
-		return err
+		return newSystemError(err)
 	}
 	if ierr != nil {
-		return ierr
+		return newSystemError(ierr)
 	}
 	return nil
 }
@@ -232,7 +232,7 @@ func (p *initProcess) createNetworkInterfaces() error {
 func (p *initProcess) newUsernsSetupProcess() (parentProcess, error) {
 	parentPipe, childPipe, err := newPipe()
 	if err != nil {
-		return nil, err
+		return nil, newSystemError(err)
 	}
 	cmd := exec.Command(p.cmd.Args[0], p.cmd.Args[1:]...)
 	cmd.ExtraFiles = []*os.File{childPipe}

linux_userns_init.go

@@ -21,7 +21,8 @@ func (l *linuxUsernsInit) Init() error {
 	}
 	consolePath := l.config.Config.Console
 	if consolePath != "" {
-		console := newConsoleFromPath(consolePath)
+		// TODO: why is this hard coded?
+		console := newConsoleFromPath("/dev/console")
 		if err := console.dupStdio(); err != nil {
 			return err
 		}

nsinit/config.go

@@ -12,14 +12,30 @@ import (
 	"github.com/docker/libcontainer/configs"
 )
 
+var createFlags = []cli.Flag{
+	cli.IntFlag{Name: "parent-death-signal", Usage: "set the signal that will be delivered to the process incase the parent dies"},
+	cli.BoolFlag{Name: "read-only", Usage: "set the container's rootfs as read-only"},
+	cli.StringSliceFlag{Name: "bind", Value: &cli.StringSlice{}, Usage: "add bind mounts to the container"},
+	cli.StringSliceFlag{Name: "tmpfs", Value: &cli.StringSlice{}, Usage: "add tmpfs mounts to the container"},
+	cli.IntFlag{Name: "cpushares", Usage: "set the cpushares for the container"},
+	cli.IntFlag{Name: "memory-limit", Usage: "set the memory limit for the container"},
+	cli.IntFlag{Name: "memory-swap", Usage: "set the memory swap limit for the container"},
+	cli.StringFlag{Name: "cpuset-cpus", Usage: "set the cpuset cpus"},
+	cli.StringFlag{Name: "cpuset-mems", Usage: "set the cpuset mems"},
+	cli.StringFlag{Name: "apparmor-profile", Usage: "set the apparmor profile"},
+	cli.StringFlag{Name: "process-label", Usage: "set the process label"},
+	cli.StringFlag{Name: "mount-label", Usage: "set the mount label"},
+}
+
 var configCommand = cli.Command{
 	Name:  "config",
 	Usage: "generate a standard configuration file for a container",
-	Flags: []cli.Flag{
+	Flags: append([]cli.Flag{
 		cli.StringFlag{Name: "file,f", Value: "stdout", Usage: "write the configuration to the specified file"},
-	},
+	}, createFlags...),
 	Action: func(context *cli.Context) {
 		template := getTemplate()
+		modify(template, context)
 		data, err := json.MarshalIndent(template, "", "\t")
 		if err != nil {
 			fatal(err)
@@ -41,6 +57,19 @@ var configCommand = cli.Command{
 	},
 }
 
+func modify(config *configs.Config, context *cli.Context) {
+	config.ParentDeathSignal = context.Int("parent-death-signal")
+	config.Readonlyfs = context.Bool("read-only")
+	config.Cgroups.CpusetCpus = context.String("cpuset-cpus")
+	config.Cgroups.CpusetMems = context.String("cpuset-mems")
+	config.Cgroups.CpuShares = int64(context.Int("cpushares"))
+	config.Cgroups.Memory = int64(context.Int("memory-limit"))
+	config.Cgroups.MemorySwap = int64(context.Int("memory-swap"))
+	config.AppArmorProfile = context.String("apparmor-profile")
+	config.ProcessLabel = context.String("process-label")
+	config.MountLabel = context.String("mount-label")
+}
+
 func getTemplate() *configs.Config {
 	cwd, err := os.Getwd()
 	if err != nil {
@@ -91,14 +120,8 @@ func getTemplate() *configs.Config {
 		Rlimits: []configs.Rlimit{
 			{
 				Type: syscall.RLIMIT_NOFILE,
-				Hard: uint64(1024),
-				Soft: uint64(1024),
-			},
-		},
-		Mounts: []*configs.Mount{
-			{
-				Type:        "tmpfs",
-				Destination: "/tmp",
+				Hard: 1024,
+				Soft: 1024,
 			},
 		},
 	}

nsinit/exec.go

@@ -20,13 +20,14 @@ var execCommand = cli.Command{
 	Name:   "exec",
 	Usage:  "execute a new command inside a container",
 	Action: execAction,
-	Flags: []cli.Flag{
+	Flags: append([]cli.Flag{
 		cli.BoolFlag{Name: "tty,t", Usage: "allocate a TTY to the container"},
 		cli.StringFlag{Name: "id", Value: "nsinit", Usage: "specify the ID for a container"},
 		cli.StringFlag{Name: "config", Value: "container.json", Usage: "path to the configuration file"},
+		cli.BoolFlag{Name: "create", Usage: "create the container's configuration on the fly with arguments"},
 		cli.StringFlag{Name: "user,u", Value: "root", Usage: "set the user, uid, and/or gid for the process"},
 		cli.StringSliceFlag{Name: "env", Value: standardEnvironment, Usage: "set environment variables for the process"},
-	},
+	}, createFlags...),
 }
 
 func execAction(context *cli.Context) {
@@ -38,6 +39,7 @@ func execAction(context *cli.Context) {
 	if err != nil {
 		fatal(err)
 	}
+	created := false
 	container, err := factory.Load(context.String("id"))
 	if err != nil {
 		if lerr, ok := err.(libcontainer.Error); !ok || lerr.Code() != libcontainer.ContainerNotExists {
@@ -45,10 +47,15 @@ func execAction(context *cli.Context) {
 		}
 		config, err := loadConfig(context)
 		if err != nil {
+			tty.Close()
 			fatal(err)
 		}
-		config.Console = tty.console.Path()
+		if tty.console != nil {
+			config.Console = tty.console.Path()
+		}
+		created = true
 		if container, err = factory.Create(context.String("id"), config); err != nil {
+			tty.Close()
 			fatal(err)
 		}
 	}
@@ -64,19 +71,26 @@ func execAction(context *cli.Context) {
 	tty.attach(process)
 	pid, err := container.Start(process)
 	if err != nil {
+		tty.Close()
 		fatal(err)
 	}
 	proc, err := os.FindProcess(pid)
 	if err != nil {
+		tty.Close()
 		fatal(err)
 	}
 	status, err := proc.Wait()
 	if err != nil {
+		tty.Close()
 		fatal(err)
 	}
-	if err := container.Destroy(); err != nil {
-		fatal(err)
+	if created {
+		if err := container.Destroy(); err != nil {
+			tty.Close()
+			fatal(err)
+		}
 	}
+	tty.Close()
 	os.Exit(utils.ExitStatus(status.Sys().(syscall.WaitStatus)))
 }
 

nsinit/main.go

@@ -18,13 +18,14 @@ func main() {
 		cli.StringFlag{Name: "root", Value: ".", Usage: "root directory for containers"},
 	}
 	app.Commands = []cli.Command{
+		configCommand,
 		execCommand,
 		initCommand,
 		oomCommand,
 		pauseCommand,
 		statsCommand,
 		unpauseCommand,
-		configCommand,
+		stateCommand,
 	}
 	if err := app.Run(os.Args); err != nil {
 		log.Fatal(err)

nsinit/state.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/codegangsta/cli"
+)
+
+var stateCommand = cli.Command{
+	Name:  "state",
+	Usage: "get the container's current state",
+	Flags: []cli.Flag{
+		cli.StringFlag{Name: "id", Value: "nsinit", Usage: "specify the ID for a container"},
+	},
+	Action: func(context *cli.Context) {
+		container, err := getContainer(context)
+		if err != nil {
+			fatal(err)
+		}
+		state, err := container.State()
+		if err != nil {
+			fatal(err)
+		}
+		data, err := json.MarshalIndent(state, "", "\t")
+		if err != nil {
+			fatal(err)
+		}
+		fmt.Printf("%s", data)
+	},
+}

nsinit/stats.go

@@ -3,7 +3,6 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"log"
 
 	"github.com/codegangsta/cli"
 )
@@ -17,15 +16,15 @@ var statsCommand = cli.Command{
 	Action: func(context *cli.Context) {
 		container, err := getContainer(context)
 		if err != nil {
-			log.Fatal(err)
+			fatal(err)
 		}
 		stats, err := container.Stats()
 		if err != nil {
-			log.Fatal(err)
+			fatal(err)
 		}
-		data, jerr := json.MarshalIndent(stats, "", "\t")
+		data, err := json.MarshalIndent(stats, "", "\t")
 		if err != nil {
-			log.Fatal(jerr)
+			fatal(err)
 		}
 		fmt.Printf("%s", data)
 	},

nsinit/utils.go

@@ -11,6 +11,11 @@ import (
 )
 
 func loadConfig(context *cli.Context) (*configs.Config, error) {
+	if context.Bool("create") {
+		config := getTemplate()
+		modify(config, context)
+		return config, nil
+	}
 	f, err := os.Open(context.String("config"))
 	if err != nil {
 		return nil, err