Start work on Container and Process model

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

execution/container.go

@@ -0,0 +1,85 @@
+package execution
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+type ContainerController interface {
+	Pause(*Container) error
+	Resume(*Container) error
+	Status(*Container) (Status, error)
+	Process(c *Container, pid int) (*Process, error)
+	Processes(*Container) ([]*Process, error)
+}
+
+func NewContainer(c ContainerController) *Container {
+	return &Container{
+		controller: c,
+	}
+}
+
+type Container struct {
+	ID         string
+	Bundle     string
+	Root       string
+	controller ContainerController
+
+	processes map[int]*Process
+}
+
+func (c *Container) Process(pid int) (*Process, error) {
+	for _, p := range c.processes {
+		if p.Pid == pid {
+			return p, nil
+		}
+	}
+	return nil, fmt.Errorf("todo make real error")
+}
+
+func (c *Container) CreateProcess(spec *specs.Process) (*Process, error) {
+	if err := os.MkdirAll(filepath.Join(c.Root, c.getNextProcessID()), 0660); err != nil {
+		return nil, err
+	}
+	process := &Process{
+		Spec:       spec,
+		controller: c.controller,
+	}
+	c.processes = append(c.processes, process)
+	return process, nil
+}
+
+func (c *Container) DeleteProcess(pid int) error {
+	process, ok := c.processes[pid]
+	if !ok {
+		return fmt.Errorf("it no here")
+	}
+	if process.Status() != Stopped {
+		return fmt.Errorf("tototoit not stopped ok?")
+	}
+	delete(c.processes, pid)
+	return os.RemoveAll(p.Root)
+}
+
+func (c *Container) Processes() []*Process {
+	var out []*Process
+	for _, p := range c.processes {
+		out = append(out, p)
+	}
+	return out
+}
+
+func (c *Container) Pause() error {
+	return c.controller.Pause(c)
+}
+
+func (c *Container) Resume() error {
+	return c.controller.Resume(c)
+}
+
+func (c *Container) Status() (Status, error) {
+	return c.controller.Status(c)
+}