refactor: extract code from the container package

cmd/root.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"github.com/containrrr/watchtower/pkg/filters"
 	"os"
 	"os/signal"
 	"strconv"
@@ -108,7 +109,7 @@ func PreRun(cmd *cobra.Command, args []string) {
 
 // Run is the main execution flow of the command
 func Run(c *cobra.Command, names []string) {
-	filter := container.BuildFilter(names, enableLabel)
+	filter := filters.BuildFilter(names, enableLabel)
 	runOnce, _ := c.PersistentFlags().GetBool("run-once")
 
 	if runOnce {
@@ -172,7 +173,7 @@ func runUpgradesOnSchedule(filter t.Filter) error {
 
 func runUpdatesWithNotifications(filter t.Filter) {
 	notifier.StartNotification()
-	updateParams := actions.UpdateParams{
+	updateParams := t.UpdateParams{
 		Filter:         filter,
 		Cleanup:        cleanup,
 		NoRestart:      noRestart,

internal/actions/check.go

@@ -3,6 +3,8 @@ package actions
 import (
 	"errors"
 	"fmt"
+	"github.com/containrrr/watchtower/pkg/filters"
+	"github.com/containrrr/watchtower/pkg/sorter"
 	"sort"
 	"strings"
 	"time"
@@ -19,7 +21,7 @@ import (
 // will stop and remove all but the most recently started container.
 func CheckForMultipleWatchtowerInstances(client container.Client, cleanup bool) error {
 	awaitDockerClient()
-	containers, err := client.ListContainers(container.WatchtowerContainersFilter)
+	containers, err := client.ListContainers(filters.WatchtowerContainersFilter)
 
 	if err != nil {
 		log.Fatal(err)
@@ -39,7 +41,7 @@ func cleanupExcessWatchtowers(containers []container.Container, client container
 	var cleanupErrors int
 	var stopErrors int
 
-	sort.Sort(container.ByCreated(containers))
+	sort.Sort(sorter.ByCreated(containers))
 	allContainersExceptLast := containers[0 : len(containers)-1]
 
 	for _, c := range allContainersExceptLast {

internal/actions/update.go

@@ -3,6 +3,9 @@ package actions
 import (
 	"github.com/containrrr/watchtower/internal/util"
 	"github.com/containrrr/watchtower/pkg/container"
+	"github.com/containrrr/watchtower/pkg/lifecycle"
+	"github.com/containrrr/watchtower/pkg/sorter"
+	"github.com/containrrr/watchtower/pkg/types"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -10,10 +13,12 @@ import (
 // used to start those containers have been updated. If a change is detected in
 // any of the images, the associated containers are stopped and restarted with
 // the new image.
-func Update(client container.Client, params UpdateParams) error {
+func Update(client container.Client, params types.UpdateParams) error {
 	log.Debug("Checking containers for updated images")
 
-	executePreCheck(client, params)
+	if params.LifecycleHooks {
+		lifecycle.ExecutePreChecks(client, params)
+	}
 
 	containers, err := client.ListContainers(params.Filter)
 	if err != nil {
@@ -30,7 +35,7 @@ func Update(client container.Client, params UpdateParams) error {
 		containers[i].Stale = stale
 	}
 
-	containers, err = container.SortByDependencies(containers)
+	containers, err = sorter.SortByDependencies(containers)
 	if err != nil {
 		return err
 	}
@@ -38,24 +43,28 @@ func Update(client container.Client, params UpdateParams) error {
 	checkDependencies(containers)
 
 	if params.MonitorOnly {
-		executePostCheck(client, params)
+		if params.LifecycleHooks {
+			lifecycle.ExecutePostChecks(client, params)
+		}
 		return nil
 	}
 
 	stopContainersInReversedOrder(containers, client, params)
 	restartContainersInSortedOrder(containers, client, params)
 
-	executePostCheck(client, params)
+	if params.LifecycleHooks {
+		lifecycle.ExecutePostChecks(client, params)
+	}
 	return nil
 }
 
-func stopContainersInReversedOrder(containers []container.Container, client container.Client, params UpdateParams) {
+func stopContainersInReversedOrder(containers []container.Container, client container.Client, params types.UpdateParams) {
 	for i := len(containers) - 1; i >= 0; i-- {
 		stopStaleContainer(containers[i], client, params)
 	}
 }
 
-func stopStaleContainer(container container.Container, client container.Client, params UpdateParams) {
+func stopStaleContainer(container container.Container, client container.Client, params types.UpdateParams) {
 	if container.IsWatchtower() {
 		log.Debugf("This is the watchtower container %s", container.Name())
 		return
@@ -64,15 +73,17 @@ func stopStaleContainer(container container.Container, client container.Client,
 	if !container.Stale {
 		return
 	}
+	if params.LifecycleHooks {
+		lifecycle.ExecutePreUpdateCommand(client, container)
 
-	executePreUpdateCommand(client, container)
+	}
 
 	if err := client.StopContainer(container, params.Timeout); err != nil {
 		log.Error(err)
 	}
 }
 
-func restartContainersInSortedOrder(containers []container.Container, client container.Client, params UpdateParams) {
+func restartContainersInSortedOrder(containers []container.Container, client container.Client, params types.UpdateParams) {
 	imageIDs := make(map[string]bool)
 
 	for _, container := range containers {
@@ -91,7 +102,7 @@ func restartContainersInSortedOrder(containers []container.Container, client con
 	}
 }
 
-func restartStaleContainer(container container.Container, client container.Client, params UpdateParams) {
+func restartStaleContainer(container container.Container, client container.Client, params types.UpdateParams) {
 	// Since we can't shutdown a watchtower container immediately, we need to
 	// start the new one while the old one is still running. This prevents us
 	// from re-using the same container name so we first rename the current
@@ -107,7 +118,7 @@ func restartStaleContainer(container container.Container, client container.Clien
 		if newContainerID, err := client.StartContainer(container); err != nil {
 			log.Error(err)
 		} else if container.Stale && params.LifecycleHooks {
-			executePostUpdateCommand(client, newContainerID)
+			lifecycle.ExecutePostUpdateCommand(client, newContainerID)
 		}
 	}
 }
@@ -130,82 +141,3 @@ func checkDependencies(containers []container.Container) {
 		}
 	}
 }
-
-func executePreCheck(client container.Client, params UpdateParams) {
-	containers, err := client.ListContainers(params.Filter)
-	if err != nil {
-		return
-	}
-	for _, container := range containers {
-		executePreCheckCommand(client, container)
-	}
-}
-
-func executePostCheck(client container.Client, params UpdateParams) {
-	containers, err := client.ListContainers(params.Filter)
-	if err != nil {
-		return
-	}
-	for _, container := range containers {
-		executePostCheckCommand(client, container)
-	}
-}
-
-func executePreCheckCommand(client container.Client, container container.Container) {
-	command := container.GetLifecyclePreCheckCommand()
-	if len(command) == 0 {
-		log.Debug("No pre-check command supplied. Skipping")
-		return
-	}
-
-	log.Info("Executing pre-check command.")
-	if err := client.ExecuteCommand(container.ID(), command); err != nil {
-		log.Error(err)
-	}
-}
-
-func executePostCheckCommand(client container.Client, container container.Container) {
-	command := container.GetLifecyclePostCheckCommand()
-	if len(command) == 0 {
-		log.Debug("No post-check command supplied. Skipping")
-		return
-	}
-
-	log.Info("Executing post-check command.")
-	if err := client.ExecuteCommand(container.ID(), command); err != nil {
-		log.Error(err)
-	}
-}
-
-func executePreUpdateCommand(client container.Client, container container.Container) {
-
-	command := container.GetLifecyclePreUpdateCommand()
-	if len(command) == 0 {
-		log.Debug("No pre-update command supplied. Skipping")
-		return
-	}
-
-	log.Info("Executing pre-update command.")
-	if err := client.ExecuteCommand(container.ID(), command); err != nil {
-		log.Error(err)
-	}
-}
-
-func executePostUpdateCommand(client container.Client, newContainerID string) {
-	newContainer, err := client.GetContainer(newContainerID)
-	if err != nil {
-		log.Error(err)
-		return
-	}
-
-	command := newContainer.GetLifecyclePostUpdateCommand()
-	if len(command) == 0 {
-		log.Debug("No post-update command supplied. Skipping")
-		return
-	}
-
-	log.Info("Executing post-update command.")
-	if err := client.ExecuteCommand(newContainerID, command); err != nil {
-		log.Error(err)
-	}
-}

internal/actions/update_test.go

@@ -4,6 +4,7 @@ import (
 	"github.com/containrrr/watchtower/internal/actions"
 	"github.com/containrrr/watchtower/pkg/container"
 	"github.com/containrrr/watchtower/pkg/container/mocks"
+	"github.com/containrrr/watchtower/pkg/types"
 	cli "github.com/docker/docker/client"
 	"time"
 
@@ -59,7 +60,7 @@ var _ = Describe("the update action", func() {
 		When("there are multiple containers using the same image", func() {
 			It("should only try to remove the image once", func() {
 
-				err := actions.Update(client, actions.UpdateParams{ Cleanup: true })
+				err := actions.Update(client, types.UpdateParams{ Cleanup: true })
 				Expect(err).NotTo(HaveOccurred())
 				Expect(client.TestData.TriedToRemoveImageCount).To(Equal(1))
 			})
@@ -75,7 +76,7 @@ var _ = Describe("the update action", func() {
 						time.Now(),
 					),
 				)
-				err := actions.Update(client, actions.UpdateParams{ Cleanup: true })
+				err := actions.Update(client, types.UpdateParams{ Cleanup: true })
 				Expect(err).NotTo(HaveOccurred())
 				Expect(client.TestData.TriedToRemoveImageCount).To(Equal(2))
 			})

pkg/container/client.go

@@ -3,6 +3,7 @@ package container
 import (
 	"bytes"
 	"fmt"
+	"github.com/containrrr/watchtower/pkg/registry"
 	"io/ioutil"
 	"strings"
 	"time"
@@ -12,7 +13,7 @@ import (
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/filters"
 	"github.com/docker/docker/api/types/network"
-	dockerclient "github.com/docker/docker/client"
+	sdkClient "github.com/docker/docker/client"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/net/context"
 )
@@ -40,7 +41,7 @@ type Client interface {
 //  * DOCKER_TLS_VERIFY		whether to verify tls certificates
 //  * DOCKER_API_VERSION	the minimum docker api version to work with
 func NewClient(pullImages bool, includeStopped bool, reviveStopped bool, removeVolumes bool) Client {
-	cli, err := dockerclient.NewClientWithOpts(dockerclient.FromEnv)
+	cli, err := sdkClient.NewClientWithOpts(sdkClient.FromEnv)
 
 	if err != nil {
 		log.Fatalf("Error instantiating Docker client: %s", err)
@@ -56,7 +57,7 @@ func NewClient(pullImages bool, includeStopped bool, reviveStopped bool, removeV
 }
 
 type dockerClient struct {
-	api            dockerclient.CommonAPIClient
+	api            sdkClient.CommonAPIClient
 	pullImages     bool
 	removeVolumes  bool
 	includeStopped bool
@@ -231,53 +232,60 @@ func (client dockerClient) RenameContainer(c Container, newName string) error {
 	return client.api.ContainerRename(bg, c.ID(), newName)
 }
 
-func (client dockerClient) IsContainerStale(c Container) (bool, error) {
+func (client dockerClient) IsContainerStale(container Container) (bool, error) {
-	bg := context.Background()
+	ctx := context.Background()
-	oldImageInfo := c.imageInfo
-	imageName := c.ImageName()
-
-	if client.pullImages {
-		log.Debugf("Pulling %s for %s", imageName, c.Name())
 
-		var opts types.ImagePullOptions // ImagePullOptions can take a RegistryAuth arg to authenticate against a private registry
+	if !client.pullImages {
-		auth, err := EncodedAuth(imageName)
+		log.Debugf("Skipping image pull.")
-		log.Debugf("Got auth value: %s", auth)
+	} else if err := client.PullImage(ctx, container); err != nil {
-		log.Debugf("Got image name: %s", imageName)
-		if err != nil {
-			log.Debugf("Error loading authentication credentials %s", err)
 		return false, err
-		} else if auth == "" {
-			log.Debugf("No authentication credentials found for %s", imageName)
-			opts = types.ImagePullOptions{} // empty/no auth credentials
-		} else {
-			opts = types.ImagePullOptions{RegistryAuth: auth, PrivilegeFunc: DefaultAuthHandler}
 	}
 
-		response, err := client.api.ImagePull(bg, imageName, opts)
+	return client.HasNewImage(ctx, container)
+}
+
+func (client dockerClient) HasNewImage(ctx context.Context, container Container) (bool, error) {
+	oldImageID := container.imageInfo.ID
+	imageName := container.ImageName()
+
+	newImageInfo, _, err := client.api.ImageInspectWithRaw(ctx, imageName)
 	if err != nil {
-			log.Debugf("Error pulling image %s, %s", imageName, err)
 		return false, err
 	}
-		defer response.Close()
 
-		// the pull request will be aborted prematurely unless the response is read
+	if newImageInfo.ID == oldImageID {
-		if _, err = ioutil.ReadAll(response); err != nil {
+		log.Debugf("No new images found for %s", container.Name())
-			log.Error(err)
+		return false, nil
-		}
 	}
 
-	newImageInfo, _, err := client.api.ImageInspectWithRaw(bg, imageName)
+	log.Infof("Found new %s image (%s)", imageName, newImageInfo.ID)
+	return true, nil
+}
+
+func (client dockerClient) PullImage(ctx context.Context, container Container) error {
+	containerName := container.Name()
+	imageName := container.ImageName()
+	log.Debugf("Pulling %s for %s", imageName, containerName)
+
+	opts, err := registry.GetPullOptions(imageName)
 	if err != nil {
-		return false, err
+		log.Debugf("Error loading authentication credentials %s", err)
+		return err
 	}
 
-	if newImageInfo.ID != oldImageInfo.ID {
+	response, err := client.api.ImagePull(ctx, imageName, opts)
-		log.Infof("Found new %s image (%s)", imageName, newImageInfo.ID)
+	if err != nil {
-		return true, nil
+		log.Debugf("Error pulling image %s, %s", imageName, err)
+		return err
 	}
 
-	log.Debugf("No new images found for %s", c.Name())
+	defer response.Close()
-	return false, nil
+	// the pull request will be aborted prematurely unless the response is read
+	if _, err = ioutil.ReadAll(response); err != nil {
+		log.Error(err)
+		return err
+	}
+	return nil
 }
 
 func (client dockerClient) RemoveImageByID(id string) error {

pkg/container/container.go

@@ -28,6 +28,11 @@ type Container struct {
 	imageInfo     *types.ImageInspect
 }
 
+// ContainerInfo fetches JSON info for the container
+func (c Container) ContainerInfo() *types.ContainerJSON {
+	return c.containerInfo
+}
+
 // ID returns the Docker container ID.
 func (c Container) ID() string {
 	return c.containerInfo.ID

pkg/container/container_test.go

@@ -2,6 +2,7 @@ package container
 
 import (
 	"github.com/containrrr/watchtower/pkg/container/mocks"
+	"github.com/containrrr/watchtower/pkg/filters"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/container"
 	cli "github.com/docker/docker/client"
@@ -34,14 +35,14 @@ var _ = Describe("the container", func() {
 		})
 		When("listing containers without any filter", func() {
 			It("should return all available containers", func() {
-				containers, err := client.ListContainers(noFilter)
+				containers, err := client.ListContainers(filters.NoFilter)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(len(containers) == 2).To(BeTrue())
 			})
 		})
 		When("listing containers with a filter matching nothing", func() {
 			It("should return an empty array", func() {
-				filter := filterByNames([]string{"lollercoaster"}, noFilter)
+				filter := filters.FilterByNames([]string{"lollercoaster"}, filters.NoFilter)
 				containers, err := client.ListContainers(filter)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(len(containers) == 0).To(BeTrue())
@@ -49,7 +50,7 @@ var _ = Describe("the container", func() {
 		})
 		When("listing containers with a watchtower filter", func() {
 			It("should return only the watchtower container", func() {
-				containers, err := client.ListContainers(WatchtowerContainersFilter)
+				containers, err := client.ListContainers(filters.WatchtowerContainersFilter)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(len(containers) == 1).To(BeTrue())
 				Expect(containers[0].ImageName()).To(Equal("containrrr/watchtower:latest"))
@@ -62,7 +63,7 @@ var _ = Describe("the container", func() {
 					pullImages:     false,
 					includeStopped: true,
 				}
-				containers, err := client.ListContainers(noFilter)
+				containers, err := client.ListContainers(filters.NoFilter)
 				Expect(err).NotTo(HaveOccurred())
 				Expect(len(containers) > 0).To(BeTrue())
 			})

pkg/filters/filters.go

@@ -1,15 +1,15 @@
-package container
+package filters
 
 import t "github.com/containrrr/watchtower/pkg/types"
 
 // WatchtowerContainersFilter filters only watchtower containers
 func WatchtowerContainersFilter(c t.FilterableContainer) bool { return c.IsWatchtower() }
 
-// Filter no containers and returns all
+// NoFilter will not filter out any containers
-func noFilter(t.FilterableContainer) bool { return true }
+func NoFilter(t.FilterableContainer) bool { return true }
 
-// Filters containers which don't have a specified name
+// FilterByNames returns all containers that match the specified name
-func filterByNames(names []string, baseFilter t.Filter) t.Filter {
+func FilterByNames(names []string, baseFilter t.Filter) t.Filter {
 	if len(names) == 0 {
 		return baseFilter
 	}
@@ -24,8 +24,8 @@ func filterByNames(names []string, baseFilter t.Filter) t.Filter {
 	}
 }
 
-// Filters out containers that don't have the 'enableLabel'
+// FilterByEnableLabel returns all containers that have the enabled label set
-func filterByEnableLabel(baseFilter t.Filter) t.Filter {
+func FilterByEnableLabel(baseFilter t.Filter) t.Filter {
 	return func(c t.FilterableContainer) bool {
 		// If label filtering is enabled, containers should only be considered
 		// if the label is specifically set.
@@ -38,8 +38,8 @@ func filterByEnableLabel(baseFilter t.Filter) t.Filter {
 	}
 }
 
-// Filters out containers that have a 'enableLabel' and is set to disable.
+// FilterByDisabledLabel returns all containers that have the enabled label set to disable
-func filterByDisabledLabel(baseFilter t.Filter) t.Filter {
+func FilterByDisabledLabel(baseFilter t.Filter) t.Filter {
 	return func(c t.FilterableContainer) bool {
 		enabledLabel, ok := c.Enabled()
 		if ok && !enabledLabel {
@@ -53,13 +53,13 @@ func filterByDisabledLabel(baseFilter t.Filter) t.Filter {
 
 // BuildFilter creates the needed filter of containers
 func BuildFilter(names []string, enableLabel bool) t.Filter {
-	filter := noFilter
+	filter := NoFilter
-	filter = filterByNames(names, filter)
+	filter = FilterByNames(names, filter)
 	if enableLabel {
 		// If label filtering is enabled, containers should only be considered
 		// if the label is specifically set.
-		filter = filterByEnableLabel(filter)
+		filter = FilterByEnableLabel(filter)
 	}
-	filter = filterByDisabledLabel(filter)
+	filter = FilterByDisabledLabel(filter)
 	return filter
 }

pkg/filters/filters_test.go

@@ -1,4 +1,4 @@
-package container
+package filters
 
 import (
 	"testing"
@@ -20,7 +20,7 @@ func TestWatchtowerContainersFilter(t *testing.T) {
 func TestNoFilter(t *testing.T) {
 	container := new(mocks.FilterableContainer)
 
-	assert.True(t, noFilter(container))
+	assert.True(t, NoFilter(container))
 
 	container.AssertExpectations(t)
 }
@@ -28,12 +28,12 @@ func TestNoFilter(t *testing.T) {
 func TestFilterByNames(t *testing.T) {
 	var names []string
 
-	filter := filterByNames(names, nil)
+	filter := FilterByNames(names, nil)
 	assert.Nil(t, filter)
 
 	names = append(names, "test")
 
-	filter = filterByNames(names, noFilter)
+	filter = FilterByNames(names, NoFilter)
 	assert.NotNil(t, filter)
 
 	container := new(mocks.FilterableContainer)
@@ -48,7 +48,7 @@ func TestFilterByNames(t *testing.T) {
 }
 
 func TestFilterByEnableLabel(t *testing.T) {
-	filter := filterByEnableLabel(noFilter)
+	filter := FilterByEnableLabel(NoFilter)
 	assert.NotNil(t, filter)
 
 	container := new(mocks.FilterableContainer)
@@ -68,7 +68,7 @@ func TestFilterByEnableLabel(t *testing.T) {
 }
 
 func TestFilterByDisabledLabel(t *testing.T) {
-	filter := filterByDisabledLabel(noFilter)
+	filter := FilterByDisabledLabel(NoFilter)
 	assert.NotNil(t, filter)
 
 	container := new(mocks.FilterableContainer)

pkg/lifecycle/lifecycle.go

@@ -0,0 +1,93 @@
+package lifecycle
+
+import (
+	"github.com/containrrr/watchtower/pkg/container"
+	"github.com/containrrr/watchtower/pkg/types"
+	log "github.com/sirupsen/logrus"
+)
+
+// ExecutePreChecks tries to run the pre-check lifecycle hook for all containers included by the current filter.
+func ExecutePreChecks(client container.Client, params types.UpdateParams) {
+	containers, err := client.ListContainers(params.Filter)
+	if err != nil {
+		return
+	}
+	for _, container := range containers {
+		ExecutePreCheckCommand(client, container)
+	}
+}
+
+// ExecutePostChecks tries to run the post-check lifecycle hook for all containers included by the current filter.
+func ExecutePostChecks(client container.Client, params types.UpdateParams) {
+	containers, err := client.ListContainers(params.Filter)
+	if err != nil {
+		return
+	}
+	for _, container := range containers {
+		ExecutePostCheckCommand(client, container)
+	}
+}
+
+// ExecutePreCheckCommand tries to run the pre-check lifecycle hook for a single container.
+func ExecutePreCheckCommand(client container.Client, container container.Container) {
+	command := container.GetLifecyclePreCheckCommand()
+	if len(command) == 0 {
+		log.Debug("No pre-check command supplied. Skipping")
+		return
+	}
+
+	log.Info("Executing pre-check command.")
+	if err := client.ExecuteCommand(container.ID(), command); err != nil {
+		log.Error(err)
+	}
+}
+
+// ExecutePostCheckCommand tries to run the post-check lifecycle hook for a single container.
+func ExecutePostCheckCommand(client container.Client, container container.Container) {
+	command := container.GetLifecyclePostCheckCommand()
+	if len(command) == 0 {
+		log.Debug("No post-check command supplied. Skipping")
+		return
+	}
+
+	log.Info("Executing post-check command.")
+	if err := client.ExecuteCommand(container.ID(), command); err != nil {
+		log.Error(err)
+	}
+}
+
+// ExecutePreUpdateCommand tries to run the pre-update lifecycle hook for a single container.
+func ExecutePreUpdateCommand(client container.Client, container container.Container) {
+
+	command := container.GetLifecyclePreUpdateCommand()
+	if len(command) == 0 {
+		log.Debug("No pre-update command supplied. Skipping")
+		return
+	}
+
+	log.Info("Executing pre-update command.")
+	if err := client.ExecuteCommand(container.ID(), command); err != nil {
+		log.Error(err)
+	}
+}
+
+// ExecutePostUpdateCommand tries to run the post-update lifecycle hook for a single container.
+func ExecutePostUpdateCommand(client container.Client, newContainerID string) {
+	newContainer, err := client.GetContainer(newContainerID)
+	if err != nil {
+		log.Error(err)
+		return
+	}
+
+	command := newContainer.GetLifecyclePostUpdateCommand()
+	if len(command) == 0 {
+		log.Debug("No post-update command supplied. Skipping")
+		return
+	}
+
+	log.Info("Executing post-update command.")
+	if err := client.ExecuteCommand(newContainerID, command); err != nil {
+		log.Error(err)
+	}
+}
+

pkg/registry/registry.go

@@ -0,0 +1,33 @@
+package registry
+
+import (
+	"github.com/docker/docker/api/types"
+	log "github.com/sirupsen/logrus"
+)
+
+// GetPullOptions creates a struct with all options needed for pulling images from a registry
+func GetPullOptions(imageName string) (types.ImagePullOptions, error) {
+	auth, err := EncodedAuth(imageName)
+	log.Debugf("Got image name: %s", imageName)
+	if err != nil {
+		return types.ImagePullOptions{}, err
+	}
+
+	log.Debugf("Got auth value: %s", auth)
+	if auth == "" {
+		return types.ImagePullOptions{}, nil
+	}
+
+	return types.ImagePullOptions{
+		RegistryAuth:  auth,
+		PrivilegeFunc: DefaultAuthHandler,
+	}, nil
+}
+
+// DefaultAuthHandler will be invoked if an AuthConfig is rejected
+// It could be used to return a new value for the "X-Registry-Auth" authentication header,
+// but there's no point trying again with the same value as used in AuthConfig
+func DefaultAuthHandler() (string, error) {
+	log.Debug("Authentication request was rejected. Trying again without authentication")
+	return "", nil
+}

pkg/registry/trust.go

@@ -1,4 +1,4 @@
-package container
+package registry
 
 import (
 	"errors"
@@ -97,11 +97,3 @@ func CredentialsStore(configFile configfile.ConfigFile) credentials.Store {
 func EncodeAuth(auth types.AuthConfig) (string, error) {
 	return command.EncodeAuthToBase64(auth)
 }
-
-// DefaultAuthHandler will be invoked if an AuthConfig is rejected
-// It could be used to return a new value for the "X-Registry-Auth" authentication header,
-// but there's no point trying again with the same value as used in AuthConfig
-func DefaultAuthHandler() (string, error) {
-	log.Debug("Authentication request was rejected. Trying again without authentication")
-	return "", nil
-}

pkg/registry/trust_test.go

@@ -1,4 +1,4 @@
-package container
+package registry
 
 import (
 	"github.com/stretchr/testify/assert"

pkg/sorter/sort.go

@@ -1,13 +1,14 @@
-package container
+package sorter
 
 import (
 	"fmt"
+	"github.com/containrrr/watchtower/pkg/container"
 	"time"
 )
 
 // ByCreated allows a list of Container structs to be sorted by the container's
 // created date.
-type ByCreated []Container
+type ByCreated []container.Container
 
 func (c ByCreated) Len() int      { return len(c) }
 func (c ByCreated) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
@@ -15,12 +16,12 @@ func (c ByCreated) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
 // Less will compare two elements (identified by index) in the Container
 // list by created-date.
 func (c ByCreated) Less(i, j int) bool {
-	t1, err := time.Parse(time.RFC3339Nano, c[i].containerInfo.Created)
+	t1, err := time.Parse(time.RFC3339Nano, c[i].ContainerInfo().Created)
 	if err != nil {
 		t1 = time.Now()
 	}
 
-	t2, _ := time.Parse(time.RFC3339Nano, c[j].containerInfo.Created)
+	t2, _ := time.Parse(time.RFC3339Nano, c[j].ContainerInfo().Created)
 	if err != nil {
 		t1 = time.Now()
 	}
@@ -33,18 +34,18 @@ func (c ByCreated) Less(i, j int) bool {
 // the front of the list while containers with links will be sorted after all
 // of their dependencies. This sort order ensures that linked containers can
 // be started in the correct order.
-func SortByDependencies(containers []Container) ([]Container, error) {
+func SortByDependencies(containers []container.Container) ([]container.Container, error) {
 	sorter := dependencySorter{}
 	return sorter.Sort(containers)
 }
 
 type dependencySorter struct {
-	unvisited []Container
+	unvisited []container.Container
 	marked    map[string]bool
-	sorted    []Container
+	sorted    []container.Container
 }
 
-func (ds *dependencySorter) Sort(containers []Container) ([]Container, error) {
+func (ds *dependencySorter) Sort(containers []container.Container) ([]container.Container, error) {
 	ds.unvisited = containers
 	ds.marked = map[string]bool{}
 
@@ -57,10 +58,10 @@ func (ds *dependencySorter) Sort(containers []Container) ([]Container, error) {
 	return ds.sorted, nil
 }
 
-func (ds *dependencySorter) visit(c Container) error {
+func (ds *dependencySorter) visit(c container.Container) error {
 
 	if _, ok := ds.marked[c.Name()]; ok {
-		return fmt.Errorf("Circular reference to %s", c.Name())
+		return fmt.Errorf("circular reference to %s", c.Name())
 	}
 
 	// Mark any visited node so that circular references can be detected
@@ -83,7 +84,7 @@ func (ds *dependencySorter) visit(c Container) error {
 	return nil
 }
 
-func (ds *dependencySorter) findUnvisited(name string) *Container {
+func (ds *dependencySorter) findUnvisited(name string) *container.Container {
 	for _, c := range ds.unvisited {
 		if c.Name() == name {
 			return &c
@@ -93,7 +94,7 @@ func (ds *dependencySorter) findUnvisited(name string) *Container {
 	return nil
 }
 
-func (ds *dependencySorter) removeUnvisited(c Container) {
+func (ds *dependencySorter) removeUnvisited(c container.Container) {
 	var idx int
 	for i := range ds.unvisited {
 		if ds.unvisited[i].Name() == c.Name() {

pkg/types/update_params.go

@@ -1,13 +1,12 @@
-package actions
+package types
 
 import (
-	t "github.com/containrrr/watchtower/pkg/types"
 	"time"
 )
 
 // UpdateParams contains all different options available to alter the behavior of the Update func
 type UpdateParams struct {
-	Filter         t.Filter
+	Filter         Filter
 	Cleanup        bool
 	NoRestart      bool
 	Timeout        time.Duration