Pre-update lifecycle hook (#793)

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code
#649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code
#649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code
#649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code
#649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code #649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code #649

* Make watchtower skip update if pre-update lifecycle hook exits with a non-zero exit code #649

* Prevent starting new container if old one is not stopped because of lifecycle hook.

* Add null check for c.containerInfo.State in IsRunning

* Fixed that the container would not start

* Added test for preupdate

* EX_TEMPFAIL -> ExTempFail

* Added missing fuction ouput names

* Skip preupdate when container is restarting.

internal/actions/mocks/client.go

@@ -2,6 +2,7 @@ package mocks
 
 import (
 	"errors"
+	"fmt"
 	"github.com/containrrr/watchtower/pkg/container"
 	"time"
 
@@ -70,12 +71,21 @@ func (client MockClient) RemoveImageByID(id string) error {
 
 // GetContainer is a mock method
 func (client MockClient) GetContainer(containerID string) (container.Container, error) {
-	return container.Container{}, nil
+	return client.TestData.Containers[0], nil
 }
 
 // ExecuteCommand is a mock method
-func (client MockClient) ExecuteCommand(containerID string, command string, timeout int) error {
-	return nil
+func (client MockClient) ExecuteCommand(containerID string, command string, timeout int) (SkipUpdate bool, err error) {
+	switch command {
+	case "/PreUpdateReturn0.sh":
+		return false, nil
+	case "/PreUpdateReturn1.sh":
+		return false, fmt.Errorf("command exited with code 1")
+	case "/PreUpdateReturn75.sh":
+		return true, nil
+	default:
+		return false, nil
+	}
 }
 
 // IsContainerStale is always true for the mock client

internal/actions/mocks/container.go

@@ -65,13 +65,20 @@ func CreateMockContainerWithDigest(id string, name string, image string, created
 }
 
 // CreateMockContainerWithConfig creates a container substitute valid for testing
-func CreateMockContainerWithConfig(id string, name string, image string, created time.Time, config *container2.Config) container.Container {
+func CreateMockContainerWithConfig(id string, name string, image string, running bool, restarting bool, created time.Time, config *container2.Config) container.Container {
 	content := types.ContainerJSON{
 		ContainerJSONBase: &types.ContainerJSONBase{
-			ID:      id,
-			Image:   image,
-			Name:    name,
+			ID:    id,
+			Image: image,
+			Name:  name,
+			State: &types.ContainerState{
+				Running: running,
+				Restarting: restarting,
+			},
 			Created: created.String(),
+			HostConfig: &container2.HostConfig{
+				PortBindings: map[nat.Port][]nat.PortBinding{},
+			},
 		},
 		Config: config,
 	}