[Feature] Allow to Override Entrypoint (#658)

Author: ajanikow

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Allow to mount EmptyDir
 - Allow to specify initContainers in pods
 - Add serviceAccount, resources and securityContext fields to ID Group
+- Allow to override Entrypoint
 - Add NodeSelector to Deployment Helm Chart
 
 ## [1.1.0](https://github.com/arangodb/kube-arangodb/tree/master) (2020-10-14)

pkg/apis/deployment/v1/server_group_spec.go

@@ -48,6 +48,8 @@ type ServerGroupSpec struct {
 	MaxCount *int `json:"maxCount,omitempty"`
 	// Args holds additional commandline arguments
 	Args []string `json:"args,omitempty"`
+	// Entrypoint overrides container executable
+	Entrypoint *string `json:"entrypoint,omitempty"`
 	// StorageClassName specifies the classname for storage of the servers.
 	StorageClassName *string `json:"storageClassName,omitempty"`
 	// Resources holds resource requests & limits
@@ -623,3 +625,11 @@ func (s ServerGroupSpec) GetVolumeAllowShrink() bool {
 
 	return *s.VolumeAllowShrink
 }
+
+func (s *ServerGroupSpec) GetEntrypoint(defaultEntrypoint string) string {
+	if s == nil || s.Entrypoint == nil {
+		return defaultEntrypoint
+	}
+
+	return *s.Entrypoint
+}

pkg/apis/deployment/v1/server_id_group_spec.go

@@ -26,6 +26,8 @@ import core "k8s.io/api/core/v1"
 
 // ServerIDGroupSpec contains the specification for Image Discovery image.
 type ServerIDGroupSpec struct {
+	// Entrypoint overrides container executable
+	Entrypoint *string `json:"entrypoint,omitempty"`
 	// Tolerations specifies the tolerations added to Pods in this group.
 	Tolerations []core.Toleration `json:"tolerations,omitempty"`
 	// NodeSelector speficies a set of selectors for nodes
@@ -72,3 +74,11 @@ func (s *ServerIDGroupSpec) GetResources() core.ResourceRequirements {
 
 	return *s.Resources
 }
+
+func (s *ServerIDGroupSpec) GetEntrypoint(defaultEntrypoint string) string {
+	if s == nil || s.Entrypoint == nil {
+		return defaultEntrypoint
+	}
+
+	return *s.Entrypoint
+}

pkg/apis/deployment/v1/zz_generated.deepcopy.go

@@ -227,7 +227,7 @@ func (ib *imagesBuilder) fetchArangoDBImageIDAndVersion(ctx context.Context, ima
 }
 
 func (a *ArangoDImageUpdateContainer) GetExecutor() string {
-	return resources.ArangoDExecutor
+	return a.spec.ID.GetEntrypoint(resources.ArangoDExecutor)
 }
 
 func (a *ArangoDImageUpdateContainer) GetProbes() (*core.Probe, *core.Probe, error) {

pkg/deployment/images.go

@@ -98,7 +98,7 @@ func (a *ArangoDContainer) GetPorts() []core.ContainerPort {
 }
 
 func (a *ArangoDContainer) GetExecutor() string {
-	return ArangoDExecutor
+	return a.groupSpec.GetEntrypoint(ArangoDExecutor)
 }
 
 func (a *ArangoDContainer) GetSecurityContext() *core.SecurityContext {

pkg/deployment/resources/pod_creator_arangod.go

@@ -77,7 +77,7 @@ func (a *ArangoSyncContainer) GetPorts() []core.ContainerPort {
 }
 
 func (a *ArangoSyncContainer) GetExecutor() string {
-	return ArangoSyncExecutor
+	return a.groupSpec.GetEntrypoint(ArangoSyncExecutor)
 }
 
 func (a *ArangoSyncContainer) GetSecurityContext() *core.SecurityContext {