[AIR-137] Add logic to isogen subcommand

* Add add default values for isogen subcommand keys
* Introduce container interface
* Implement docker driver
* Add stdin support to container interface
* Implement volume mount for container

Change-Id: Ide0ecd474b1ccce358bdc9c85ef0006f230490b5

go.mod

@@ -19,7 +19,7 @@ require (
 	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/daviddengcn/go-colortext v0.0.0-20180409174941-186a3d44e920 // indirect
 	github.com/docker/distribution v0.0.0-20170726174610-edc3ab29cdff // indirect
-	github.com/docker/docker v0.7.3-0.20190327010347-be7ac8be2ae0 // indirect
+	github.com/docker/docker v0.7.3-0.20190327010347-be7ac8be2ae0
 	github.com/docker/go-connections v0.3.0 // indirect
 	github.com/docker/go-units v0.3.3 // indirect
 	github.com/docker/libnetwork v0.0.0-20180830151422-a9cd636e3789 // indirect

pkg/bootstrap/isogen/command.go

@@ -1,28 +1,62 @@
 package isogen
 
 import (
-	"errors"
+	"context"
 	"fmt"
 	"io"
 
+	"opendev.org/airship/airshipctl/pkg/container"
+	"opendev.org/airship/airshipctl/pkg/errors"
 	"opendev.org/airship/airshipctl/pkg/util"
 )
 
-// ErrNotImplemented returned for not implemented features
-var ErrNotImplemented = errors.New("Error. Not implemented")
-
 // GenerateBootstrapIso will generate data for cloud init and start ISO builder container
 func GenerateBootstrapIso(settings *Settings, args []string, out io.Writer) error {
 	if settings.IsogenConfigFile == "" {
 		fmt.Fprintln(out, "Reading config file location from global settings is not supported")
-		return ErrNotImplemented
+		return errors.ErrNotImplemented{}
 	}
 
-	cfg := Config{}
+	ctx := context.Background()
+	cfg := &Config{}
 
 	if err := util.ReadYAMLFile(settings.IsogenConfigFile, &cfg); err != nil {
 		return err
 	}
-	fmt.Println("Under construction")
-	return nil
+
+	fmt.Fprintln(out, "Creating ISO builder container")
+	builder, err := container.NewContainer(
+		&ctx, cfg.Container.ContainerRuntime,
+		cfg.Container.Image)
+	if err != nil {
+		return err
+	}
+
+	return generateBootstrapIso(builder, cfg, out, settings.Debug)
+}
+
+func generateBootstrapIso(builder container.Container, cfg *Config, out io.Writer, debug bool) error {
+	vols := []string{cfg.Container.Volume}
+	fmt.Fprintf(out, "Running default container command. Mounted dir: %s\n", vols)
+	if err := builder.RunCommand(
+		[]string{},
+		nil,
+		vols,
+		[]string{},
+		debug,
+	); err != nil {
+		return err
+	}
+
+	fmt.Fprintln(out, "ISO successfully built.")
+	if debug {
+		fmt.Fprintf(
+			out,
+			"Debug flag is set. Container %s stopped but not deleted.\n",
+			builder.GetId(),
+		)
+		return nil
+	}
+	fmt.Fprintln(out, "Removing container.")
+	return builder.RmContainer()
 }

pkg/bootstrap/isogen/command_test.go

@@ -0,0 +1,98 @@
+package isogen
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type mockContainer struct {
+	imagePull        func() error
+	runCommand       func() error
+	runCommandOutput func() (io.ReadCloser, error)
+	rmContainer      func() error
+	getId            func() string
+}
+
+func (mc *mockContainer) ImagePull() error {
+	return mc.imagePull()
+}
+
+func (mc *mockContainer) RunCommand([]string, io.Reader, []string, []string, bool) error {
+	return mc.runCommand()
+}
+
+func (mc *mockContainer) RunCommandOutput([]string, io.Reader, []string, []string) (io.ReadCloser, error) {
+	return mc.runCommandOutput()
+}
+
+func (mc *mockContainer) RmContainer() error {
+	return mc.rmContainer()
+}
+
+func (mc *mockContainer) GetId() string {
+	return mc.getId()
+}
+
+func TestBootstrapIso(t *testing.T) {
+	testErr := fmt.Errorf("TestErr")
+	expOut := []string{
+		"Running default container command. Mounted dir: []\n",
+		"ISO successfully built.\n",
+		"Debug flag is set. Container TESTID stopped but not deleted.\n",
+		"Removing container.\n",
+	}
+
+	tests := []struct {
+		builder     *mockContainer
+		cfg         *Config
+		debug       bool
+		expectedOut string
+		expectdErr  error
+	}{
+		{
+			builder: &mockContainer{
+				runCommand: func() error { return testErr },
+			},
+			cfg:         &Config{},
+			debug:       false,
+			expectedOut: expOut[0],
+			expectdErr:  testErr,
+		},
+		{
+			builder: &mockContainer{
+				runCommand: func() error { return nil },
+				getId:      func() string { return "TESTID" },
+			},
+			cfg:         &Config{},
+			debug:       true,
+			expectedOut: expOut[0] + expOut[1] + expOut[2],
+			expectdErr:  nil,
+		},
+		{
+			builder: &mockContainer{
+				runCommand:  func() error { return nil },
+				getId:       func() string { return "TESTID" },
+				rmContainer: func() error { return testErr },
+			},
+			cfg:         &Config{},
+			debug:       false,
+			expectedOut: expOut[0] + expOut[1] + expOut[3],
+			expectdErr:  testErr,
+		},
+	}
+
+	for _, tt := range tests {
+		actualOut := bytes.NewBufferString("")
+		actualErr := generateBootstrapIso(tt.builder, tt.cfg, actualOut, tt.debug)
+
+		errS := fmt.Sprintf("generateBootstrapIso should have return error %s, got %s", tt.expectdErr, actualErr)
+		assert.Equal(t, actualErr, tt.expectdErr, errS)
+
+		errS = fmt.Sprintf("generateBootstrapIso should have print %s, got %s", tt.expectedOut, actualOut)
+		assert.Equal(t, actualOut.String(), tt.expectedOut, errS)
+	}
+}

pkg/bootstrap/isogen/config_test.go

@@ -0,0 +1,28 @@
+package isogen
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToYaml(t *testing.T) {
+	expectedBytes := []byte(`builder: {}
+container:
+  containerRuntime: docker
+`)
+	cnf := &Config{
+		Container: Container{
+			ContainerRuntime: "docker",
+		},
+	}
+
+	actualBytes, _ := cnf.ToYAML()
+	errS := fmt.Sprintf(
+		"Call ToYAML should have returned %s, got %s",
+		expectedBytes,
+		actualBytes,
+	)
+	assert.Equal(t, actualBytes, expectedBytes, errS)
+}

pkg/container/container.go

@@ -0,0 +1,37 @@
+package container
+
+import (
+	"context"
+	"io"
+)
+
+// Container interface abstracion for continer.
+// Particular implementation depends on container runtime environment (CRE). Interface
+// defines methods that must be implemented for CRE (e.g. docker, containerd or CRI-O)
+type Container interface {
+	ImagePull() error
+	RunCommand([]string, io.Reader, []string, []string, bool) error
+	RunCommandOutput([]string, io.Reader, []string, []string) (io.ReadCloser, error)
+	RmContainer() error
+	GetId() string
+}
+
+// NewContainer returns instance of Container interface implemented by particular driver
+// Returned instance type (i.e. implementation) depends on driver sceified via function
+// arguments (e.g. "docker").
+// Supported drivers:
+//   * docker
+func NewContainer(ctx *context.Context, driver string, url string) (Container, error) {
+	switch driver {
+	case "docker":
+		cli, err := NewDockerClient(ctx)
+		if err != nil {
+			return nil, err
+		}
+		return NewDockerContainer(ctx, url, cli)
+	default:
+
+		return nil, ErrContainerDrvNotSupported{Driver: driver}
+	}
+
+}

pkg/container/container_docker.go

@@ -0,0 +1,300 @@
+package container
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strings"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/network"
+	"github.com/docker/docker/client"
+)
+
+// DockerClient interface that represents abstract Docker client object
+// Interface used as a wrapper for upstream docker client object
+type DockerClient interface {
+	// ImageInspectWithRaw returns the image information and its raw
+	// representation.
+	ImageInspectWithRaw(
+		context.Context,
+		string,
+	) (types.ImageInspect, []byte, error)
+	// ImageList returns a list of images in the docker host.
+	ImageList(
+		context.Context,
+		types.ImageListOptions,
+	) ([]types.ImageSummary, error)
+	// ImagePull requests the docker host to pull an image from a remote registry.
+	ImagePull(
+		context.Context,
+		string,
+		types.ImagePullOptions,
+	) (io.ReadCloser, error)
+	// ContainerCreate creates a new container based in the given configuration.
+	ContainerCreate(
+		context.Context,
+		*container.Config,
+		*container.HostConfig,
+		*network.NetworkingConfig,
+		string,
+	) (container.ContainerCreateCreatedBody, error)
+	// ContainerAttach attaches a connection to a container in the server.
+	ContainerAttach(
+		context.Context,
+		string,
+		types.ContainerAttachOptions,
+	) (types.HijackedResponse, error)
+	//ContainerStart sends a request to the docker daemon to start a container.
+	ContainerStart(context.Context, string, types.ContainerStartOptions) error
+	// ContainerWait waits until the specified container is in a certain state
+	// indicated by the given condition, either "not-running" (default),
+	// "next-exit", or "removed".
+	ContainerWait(
+		context.Context,
+		string,
+		container.WaitCondition,
+	) (<-chan container.ContainerWaitOKBody, <-chan error)
+	// ContainerLogs returns the logs generated by a continer in an
+	// io.ReadCloser.
+	ContainerLogs(
+		context.Context,
+		string,
+		types.ContainerLogsOptions,
+	) (io.ReadCloser, error)
+	// ContainerRemove kills and removes a container from the docker host.
+	ContainerRemove(
+		context.Context,
+		string,
+		types.ContainerRemoveOptions,
+	) error
+}
+
+// DockerContainer docker container object wrapper
+type DockerContainer struct {
+	tag          string
+	imageUrl     string
+	id           string
+	dockerClient DockerClient
+	ctx          *context.Context
+}
+
+// NewDockerClient returns instance of DockerClient.
+// Function essentially returns new Docker API client with default values
+func NewDockerClient(ctx *context.Context) (DockerClient, error) {
+	cli, err := client.NewClientWithOpts(client.FromEnv)
+	if err != nil {
+		return nil, err
+	}
+	cli.NegotiateAPIVersion(*ctx)
+	return cli, nil
+}
+
+// NewDockerContainer returns instance of DockerContainer object wrapper.
+// Function gets container image url, pointer to execution context and
+// DockerClient instance.
+//
+// url format: <image_path>:<tag>. If tag is not specified "latest" is used
+// as default value
+func NewDockerContainer(ctx *context.Context, url string, cli DockerClient) (*DockerContainer, error) {
+	t := "latest"
+	nameTag := strings.Split(url, ":")
+	if len(nameTag) == 2 {
+		t = nameTag[1]
+	}
+
+	cnt := &DockerContainer{
+		tag:          t,
+		imageUrl:     url,
+		id:           "",
+		dockerClient: cli,
+		ctx:          ctx,
+	}
+	if err := cnt.ImagePull(); err != nil {
+		return nil, err
+	}
+	return cnt, nil
+}
+
+// getCmd identifies container command. Accepts list of strings each element
+// represents command part (e.g "sample cmd --key" should be transformed to
+// []string{"sample", "command", "--key"})
+//
+// If input parameter is NOT empty list method returns input parameter
+// immediately
+//
+// If input parameter is empty list method identifies container image and
+// tries to extract Cmd option from this image description (i.e. tries to
+// identify default command specified in Dockerfile)
+func (c *DockerContainer) getCmd(cmd []string) ([]string, error) {
+	if len(cmd) > 0 {
+		return cmd, nil
+	}
+
+	id, err := c.getImageId(c.imageUrl)
+	if err != nil {
+		return nil, err
+	}
+
+	insp, _, err := c.dockerClient.ImageInspectWithRaw(*c.ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	config := *insp.Config
+	return config.Cmd, nil
+}
+
+// getConfig creates configuration structures for Docker API client.
+func (c *DockerContainer) getConfig(
+	cmd []string,
+	volumeMounts []string,
+	envVars []string,
+) (container.Config, container.HostConfig) {
+	cCfg := container.Config{
+		Image:       c.imageUrl,
+		Cmd:         cmd,
+		AttachStdin: true,
+		OpenStdin:   true,
+		Env:         envVars,
+	}
+	hCfg := container.HostConfig{
+		Binds: volumeMounts,
+	}
+	return cCfg, hCfg
+}
+
+// getImageId return ID of continer image specified by URL. Method executes
+// ImageList function supplied with "reference" filter
+func (c *DockerContainer) getImageId(url string) (string, error) {
+	kv := filters.KeyValuePair{
+		Key:   "reference",
+		Value: url,
+	}
+	filter := filters.NewArgs(kv)
+	opts := types.ImageListOptions{
+		All:     false,
+		Filters: filter,
+	}
+	img, err := c.dockerClient.ImageList(*c.ctx, opts)
+	if err != nil {
+		return "", err
+	}
+
+	if len(img) == 0 {
+		return "", ErrEmptyImageList{}
+	}
+
+	return img[0].ID, nil
+}
+
+func (c *DockerContainer) GetId() string {
+	return c.id
+}
+
+// ImagePull downloads image for container
+func (c *DockerContainer) ImagePull() error {
+	// TODO (D. Ukov) add logic for searching among local images
+	// to avoid image download on each execution
+	resp, err := c.dockerClient.ImagePull(*c.ctx, c.imageUrl, types.ImagePullOptions{})
+	if err != nil {
+		return err
+	}
+	// Wait for image is downloaded
+	if _, err := ioutil.ReadAll(resp); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// RunCommand executes specified command in Docker container. Method handles
+// container STDIN and volume binds
+func (c *DockerContainer) RunCommand(
+	cmd []string,
+	containerInput io.Reader,
+	volumeMounts []string,
+	envVars []string,
+	// TODO (D. Ukov) add debug logic
+	debug bool,
+) error {
+	realCmd, err := c.getCmd(cmd)
+	if err != nil {
+		return err
+	}
+
+	containerConfig, hostConfig := c.getConfig(realCmd, volumeMounts, envVars)
+	resp, err := c.dockerClient.ContainerCreate(
+		*c.ctx,
+		&containerConfig,
+		&hostConfig,
+		nil,
+		"",
+	)
+	if err != nil {
+		return err
+	}
+
+	c.id = resp.ID
+
+	if containerInput != nil {
+		conn, attachErr := c.dockerClient.ContainerAttach(*c.ctx, c.id, types.ContainerAttachOptions{
+			Stream: true,
+			Stdin:  true,
+		})
+		if attachErr != nil {
+			return attachErr
+		}
+		if _, err = io.Copy(conn.Conn, containerInput); err != nil {
+			return err
+		}
+	}
+
+	if err = c.dockerClient.ContainerStart(*c.ctx, c.id, types.ContainerStartOptions{}); err != nil {
+		return err
+	}
+
+	statusCh, errCh := c.dockerClient.ContainerWait(*c.ctx, c.id, container.WaitConditionNotRunning)
+	select {
+	case err = <-errCh:
+		if err != nil {
+			return err
+		}
+	case retCode := <-statusCh:
+		if retCode.StatusCode != 0 {
+			logsCmd := fmt.Sprintf("docker logs %s", c.id)
+			return ErrRunContainerCommand{Cmd: logsCmd}
+		}
+	}
+
+	return nil
+}
+
+// RunCommandOutput executes specified command in Docker container and
+// returns command output as ReadCloser object. RunCommand debug option is
+// set to false explicitly
+func (c *DockerContainer) RunCommandOutput(
+	cmd []string,
+	continerInput io.Reader,
+	volumeMounts []string,
+	envVars []string,
+) (io.ReadCloser, error) {
+	if err := c.RunCommand(cmd, continerInput, volumeMounts, envVars, false); err != nil {
+		return nil, err
+	}
+
+	return c.dockerClient.ContainerLogs(*c.ctx, c.id, types.ContainerLogsOptions{ShowStdout: true})
+}
+
+// RmContainer kills and removes a container from the docker host.
+func (c *DockerContainer) RmContainer() error {
+	return c.dockerClient.ContainerRemove(
+		*c.ctx,
+		c.id,
+		types.ContainerRemoveOptions{
+			Force: true,
+		},
+	)
+}

pkg/container/container_docker_test.go

@@ -0,0 +1,501 @@
+package container
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/network"
+)
+
+type mockConn struct {
+	WData []byte
+}
+
+func (mc mockConn) Read(b []byte) (n int, err error) { return len(b), nil }
+func (mc mockConn) Write(b []byte) (n int, err error) {
+	copy(mc.WData, b)
+	return len(b), nil
+}
+func (mc mockConn) Close() error                       { return nil }
+func (mc mockConn) LocalAddr() net.Addr                { return nil }
+func (mc mockConn) RemoteAddr() net.Addr               { return nil }
+func (mc mockConn) SetDeadline(t time.Time) error      { return nil }
+func (mc mockConn) SetReadDeadline(t time.Time) error  { return nil }
+func (mc mockConn) SetWriteDeadline(t time.Time) error { return nil }
+
+type mockDockerClient struct {
+	imageInspectWithRaw func() (types.ImageInspect, []byte, error)
+	imageList           func() ([]types.ImageSummary, error)
+	containerAttach     func() (types.HijackedResponse, error)
+	imagePull           func() (io.ReadCloser, error)
+	containerStart      func() error
+	containerWait       func() (<-chan container.ContainerWaitOKBody, <-chan error)
+	containerLogs       func() (io.ReadCloser, error)
+}
+
+func (mdc *mockDockerClient) ImageInspectWithRaw(context.Context, string) (types.ImageInspect, []byte, error) {
+	return mdc.imageInspectWithRaw()
+}
+func (mdc *mockDockerClient) ImageList(context.Context, types.ImageListOptions) ([]types.ImageSummary, error) {
+	return mdc.imageList()
+}
+func (mdc *mockDockerClient) ImagePull(
+	context.Context,
+	string,
+	types.ImagePullOptions,
+) (io.ReadCloser, error) {
+	return mdc.imagePull()
+}
+func (mdc *mockDockerClient) ContainerCreate(
+	context.Context,
+	*container.Config,
+	*container.HostConfig,
+	*network.NetworkingConfig,
+	string,
+) (container.ContainerCreateCreatedBody, error) {
+	return container.ContainerCreateCreatedBody{ID: "testID"}, nil
+}
+func (mdc *mockDockerClient) ContainerAttach(
+	context.Context,
+	string,
+	types.ContainerAttachOptions,
+) (types.HijackedResponse, error) {
+	return mdc.containerAttach()
+}
+func (mdc *mockDockerClient) ContainerStart(context.Context, string, types.ContainerStartOptions) error {
+	if mdc.containerStart != nil {
+		return mdc.containerStart()
+	}
+	return nil
+}
+func (mdc *mockDockerClient) ContainerWait(
+	context.Context,
+	string,
+	container.WaitCondition,
+) (<-chan container.ContainerWaitOKBody, <-chan error) {
+	if mdc.containerWait != nil {
+		return mdc.containerWait()
+	}
+
+	resC := make(chan container.ContainerWaitOKBody)
+	go func() {
+		resC <- container.ContainerWaitOKBody{StatusCode: 0}
+	}()
+	return resC, nil
+}
+func (mdc *mockDockerClient) ContainerLogs(context.Context, string, types.ContainerLogsOptions) (io.ReadCloser, error) {
+	if mdc.containerLogs != nil {
+		return mdc.containerLogs()
+	}
+	return ioutil.NopCloser(strings.NewReader("")), nil
+}
+
+func (mdc *mockDockerClient) ContainerRemove(context.Context, string, types.ContainerRemoveOptions) error {
+	return nil
+}
+
+func getDockerContainerMock(mdc mockDockerClient) *DockerContainer {
+	ctx := context.Background()
+	cnt := &DockerContainer{
+		dockerClient: &mdc,
+		ctx:          &ctx,
+	}
+	return cnt
+}
+
+func TestGetCmd(t *testing.T) {
+	testError := fmt.Errorf("Inspect error")
+	tests := []struct {
+		cmd              []string
+		mockDockerClient mockDockerClient
+		expectedResult   []string
+		expectedErr      error
+	}{
+		{
+			cmd:              []string{"testCmd"},
+			mockDockerClient: mockDockerClient{},
+			expectedResult:   []string{"testCmd"},
+			expectedErr:      nil,
+		},
+		{
+			cmd: []string{},
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return []types.ImageSummary{{ID: "imgid"}}, nil
+				},
+				imageInspectWithRaw: func() (types.ImageInspect, []byte, error) {
+					return types.ImageInspect{
+						Config: &container.Config{
+							Cmd: []string{"testCmd"},
+						},
+					}, nil, nil
+
+				},
+			},
+			expectedResult: []string{"testCmd"},
+			expectedErr:    nil,
+		},
+		{
+			cmd: []string{},
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return []types.ImageSummary{{ID: "imgid"}}, nil
+				},
+				imageInspectWithRaw: func() (types.ImageInspect, []byte, error) {
+					return types.ImageInspect{}, nil, testError
+				},
+			},
+			expectedResult: nil,
+			expectedErr:    testError,
+		},
+	}
+
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualRes, actualErr := cnt.getCmd(tt.cmd)
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+		assert.Equal(t, tt.expectedResult, actualRes)
+
+	}
+
+}
+
+func TestGetImageId(t *testing.T) {
+	testError := fmt.Errorf("Img List Error")
+	tests := []struct {
+		url              string
+		mockDockerClient mockDockerClient
+		expectedResult   string
+		expectedErr      error
+	}{
+		{
+			url: "test:latest",
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return nil, testError
+				},
+			},
+			expectedResult: "",
+			expectedErr:    testError,
+		},
+		{
+			url: "test:latest",
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return []types.ImageSummary{}, nil
+				},
+			},
+			expectedResult: "",
+			expectedErr:    ErrEmptyImageList{},
+		},
+	}
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualRes, actualErr := cnt.getImageId(tt.url)
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+		assert.Equal(t, tt.expectedResult, actualRes)
+	}
+}
+
+func TestImagePull(t *testing.T) {
+	testError := fmt.Errorf("Image Pull Error")
+	tests := []struct {
+		mockDockerClient mockDockerClient
+		expectedErr      error
+	}{
+		{
+			mockDockerClient: mockDockerClient{
+				imagePull: func() (io.ReadCloser, error) {
+					return ioutil.NopCloser(strings.NewReader("test")), nil
+				},
+			},
+			expectedErr: nil,
+		},
+		{
+			mockDockerClient: mockDockerClient{
+				imagePull: func() (io.ReadCloser, error) {
+					return nil, testError
+				},
+			},
+			expectedErr: testError,
+		},
+	}
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualErr := cnt.ImagePull()
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+	}
+}
+
+func TestGetId(t *testing.T) {
+	cnt := getDockerContainerMock(mockDockerClient{})
+	cnt.RunCommand([]string{"testCmd"}, nil, nil, []string{}, false)
+	actialId := cnt.GetId()
+
+	assert.Equal(t, "testID", actialId)
+}
+
+func TestRunCommand(t *testing.T) {
+	imageListeError := fmt.Errorf("Image List Error")
+	attachError := fmt.Errorf("Attach error")
+	containerStartError := fmt.Errorf("Container Start error")
+	containerWaitError := fmt.Errorf("Container Wait Error")
+	tests := []struct {
+		cmd              []string
+		containerInput   io.Reader
+		volumeMounts     []string
+		debug            bool
+		mockDockerClient mockDockerClient
+		expectedErr      error
+		assertF          func(*testing.T)
+	}{
+		{
+			cmd:              []string{"testCmd"},
+			containerInput:   nil,
+			volumeMounts:     nil,
+			debug:            false,
+			mockDockerClient: mockDockerClient{},
+			expectedErr:      nil,
+			assertF:          func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{},
+			containerInput: nil,
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return nil, imageListeError
+				},
+			},
+			expectedErr: imageListeError,
+			assertF:     func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: strings.NewReader("testInput"),
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				containerAttach: func() (types.HijackedResponse, error) {
+					conn := types.HijackedResponse{
+						Conn: mockConn{WData: make([]byte, len([]byte("testInput")))},
+					}
+					return conn, nil
+				},
+			},
+			expectedErr: nil,
+			assertF:     func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: strings.NewReader("testInput"),
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				containerAttach: func() (types.HijackedResponse, error) {
+					return types.HijackedResponse{}, attachError
+				},
+			},
+			expectedErr: attachError,
+			assertF:     func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: nil,
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				containerStart: func() error {
+					return containerStartError
+				},
+			},
+			expectedErr: containerStartError,
+			assertF:     func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: nil,
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				containerWait: func() (<-chan container.ContainerWaitOKBody, <-chan error) {
+
+					errC := make(chan error)
+					go func() {
+						errC <- containerWaitError
+					}()
+					return nil, errC
+				},
+			},
+			expectedErr: containerWaitError,
+			assertF:     func(t *testing.T) {},
+		},
+		{
+			cmd:            []string{"testCmd"},
+			containerInput: nil,
+			volumeMounts:   nil,
+			debug:          false,
+			mockDockerClient: mockDockerClient{
+				containerWait: func() (<-chan container.ContainerWaitOKBody, <-chan error) {
+
+					resC := make(chan container.ContainerWaitOKBody)
+					go func() {
+						resC <- container.ContainerWaitOKBody{StatusCode: 1}
+					}()
+					return resC, nil
+				},
+			},
+			expectedErr: ErrRunContainerCommand{Cmd: "docker logs testID"},
+			assertF:     func(t *testing.T) {},
+		},
+	}
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualErr := cnt.RunCommand(tt.cmd, tt.containerInput, tt.volumeMounts, []string{}, tt.debug)
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+
+		tt.assertF(t)
+	}
+}
+
+func TestRunCommandOutput(t *testing.T) {
+	testError := fmt.Errorf("Img List Error")
+	tests := []struct {
+		cmd              []string
+		containerInput   io.Reader
+		volumeMounts     []string
+		mockDockerClient mockDockerClient
+		expectedResult   string
+		expectedErr      error
+	}{
+		{
+			cmd:              []string{"testCmd"},
+			containerInput:   nil,
+			volumeMounts:     nil,
+			mockDockerClient: mockDockerClient{},
+			expectedResult:   "",
+			expectedErr:      nil,
+		},
+		{
+			cmd:            []string{},
+			containerInput: nil,
+			volumeMounts:   nil,
+			mockDockerClient: mockDockerClient{
+				imageList: func() ([]types.ImageSummary, error) {
+					return nil, testError
+				},
+			},
+			expectedResult: "",
+			expectedErr:    testError,
+		},
+	}
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualRes, actualErr := cnt.RunCommandOutput(tt.cmd, tt.containerInput, tt.volumeMounts, []string{})
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+
+		var actualResBytes []byte
+		if actualRes != nil {
+			actualResBytes, _ = ioutil.ReadAll(actualRes)
+		} else {
+			actualResBytes = []byte{}
+		}
+
+		assert.Equal(t, tt.expectedResult, string(actualResBytes))
+	}
+}
+
+func TestNewDockerContainer(t *testing.T) {
+	testError := fmt.Errorf("Image Pull Error")
+	type resultStruct struct {
+		tag      string
+		imageUrl string
+		id       string
+	}
+
+	tests := []struct {
+		url            string
+		ctx            context.Context
+		cli            mockDockerClient
+		expectedErr    error
+		expectedResult resultStruct
+	}{
+		{
+			url: "testPrefix/testImage:testTag",
+			ctx: context.Background(),
+			cli: mockDockerClient{
+				imagePull: func() (io.ReadCloser, error) {
+					return ioutil.NopCloser(strings.NewReader("test")), nil
+				},
+			},
+			expectedErr: nil,
+			expectedResult: resultStruct{
+				tag:      "testTag",
+				imageUrl: "testPrefix/testImage:testTag",
+				id:       "",
+			},
+		},
+		{
+			url: "testPrefix/testImage:testTag",
+			ctx: context.Background(),
+			cli: mockDockerClient{
+				imagePull: func() (io.ReadCloser, error) {
+					return nil, testError
+				},
+			},
+			expectedErr:    testError,
+			expectedResult: resultStruct{},
+		},
+	}
+	for _, tt := range tests {
+		actualRes, actualErr := NewDockerContainer(&(tt.ctx), tt.url, &(tt.cli))
+
+		assert.Equal(t, tt.expectedErr, actualErr)
+
+		var actualResStuct resultStruct
+		if actualRes == nil {
+			actualResStuct = resultStruct{}
+		} else {
+			actualResStuct = resultStruct{
+				tag:      actualRes.tag,
+				imageUrl: actualRes.imageUrl,
+				id:       actualRes.id,
+			}
+		}
+		assert.Equal(t, tt.expectedResult, actualResStuct)
+	}
+}
+
+func TestRmContainer(t *testing.T) {
+	tests := []struct {
+		mockDockerClient mockDockerClient
+		expectedErr      error
+	}{
+		{
+			mockDockerClient: mockDockerClient{},
+			expectedErr:      nil,
+		},
+	}
+
+	for _, tt := range tests {
+		cnt := getDockerContainerMock(tt.mockDockerClient)
+		actualErr := cnt.RmContainer()
+		assert.Equal(t, tt.expectedErr, actualErr)
+	}
+}

pkg/container/container_test.go

@@ -0,0 +1,21 @@
+package container
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewContainer(t *testing.T) {
+	ctx := context.Background()
+	_, actualErr := NewContainer(&ctx, "test_drv", "")
+	expectedErr := ErrContainerDrvNotSupported{Driver: "test_drv"}
+	errS := fmt.Sprintf(
+		"Call NewContainer should have returned error %s, got %s",
+		expectedErr,
+		actualErr,
+	)
+	assert.Equal(t, actualErr, expectedErr, errS)
+}

pkg/container/errors.go

@@ -0,0 +1,32 @@
+package container
+
+import (
+	"fmt"
+)
+
+// ErrEmptyImageList returned if no image defined in filter found
+type ErrEmptyImageList struct {
+}
+
+func (e ErrEmptyImageList) Error() string {
+	return "Image List Error. No images filetered"
+}
+
+// ErrRunContainerCommand returned if container command
+// exited with non-zero code
+type ErrRunContainerCommand struct {
+	Cmd string
+}
+
+func (e ErrRunContainerCommand) Error() string {
+	return fmt.Sprintf("Command error. run '%s' for details", e.Cmd)
+}
+
+// ErrContainerDrvNotSupported returned if desired CRI is not supported
+type ErrContainerDrvNotSupported struct {
+	Driver string
+}
+
+func (e ErrContainerDrvNotSupported) Error() string {
+	return fmt.Sprintf("Driver %s is not supported", e.Driver)
+}

pkg/errors/common.go

@@ -0,0 +1,9 @@
+package errors
+
+// ErrNotImplemented returned for not implemented features
+type ErrNotImplemented struct {
+}
+
+func (e ErrNotImplemented) Error() string {
+	return "Error. Not implemented"
+}