Allow to launch instances with any kind of public image.

Images that are not whitelisted will be launched as normal containers.
Only whitelisted ones will be launched as privileged.
Additionally pull the image if it doesn't exist.

pwd/docker_mock_test.go

@@ -3,6 +3,7 @@ package pwd
 import (
 	"io"
 	"net"
+	"time"
 
 	"github.com/docker/docker/api/types"
 	"github.com/play-with-docker/play-with-docker/docker"
@@ -12,6 +13,7 @@ type mockDocker struct {
 	createNetwork   func(string) error
 	connectNetwork  func(container, network, ip string) (string, error)
 	containerResize func(string, uint, uint) error
+	createContainer func(opts docker.CreateContainerOpts) (string, error)
 }
 
 func (m *mockDocker) CreateNetwork(id string) error {
@@ -47,7 +49,7 @@ func (m *mockDocker) ContainerResize(name string, rows, cols uint) error {
 	return nil
 }
 func (m *mockDocker) CreateAttachConnection(name string) (net.Conn, error) {
-	return nil, nil
+	return &mockConn{}, nil
 }
 func (m *mockDocker) CopyToContainer(containerName, destination, fileName string, content io.Reader) error {
 	return nil
@@ -56,7 +58,10 @@ func (m *mockDocker) DeleteContainer(id string) error {
 	return nil
 }
 func (m *mockDocker) CreateContainer(opts docker.CreateContainerOpts) (string, error) {
-	return "", nil
+	if m.createContainer != nil {
+		return m.createContainer(opts)
+	}
+	return "10.0.0.1", nil
 }
 func (m *mockDocker) ExecAttach(instanceName string, command []string, out io.Writer) (int, error) {
 	return 0, nil
@@ -70,3 +75,38 @@ func (m *mockDocker) DeleteNetwork(id string) error {
 func (m *mockDocker) Exec(instanceName string, command []string) (int, error) {
 	return 0, nil
 }
+
+type mockConn struct {
+}
+
+func (m *mockConn) Read(b []byte) (n int, err error) {
+	return len(b), nil
+}
+
+func (m *mockConn) Write(b []byte) (n int, err error) {
+	return len(b), nil
+}
+
+func (m *mockConn) Close() error {
+	return nil
+}
+
+func (m *mockConn) LocalAddr() net.Addr {
+	return &net.IPAddr{}
+}
+
+func (m *mockConn) RemoteAddr() net.Addr {
+	return &net.IPAddr{}
+}
+
+func (m *mockConn) SetDeadline(t time.Time) error {
+	return nil
+}
+
+func (m *mockConn) SetReadDeadline(t time.Time) error {
+	return nil
+}
+
+func (m *mockConn) SetWriteDeadline(t time.Time) error {
+	return nil
+}