[OCPCLOUD-1349] Add Machine Deletion Hook consts to machine API

machine/v1beta1/0000_10_machine.crd.yaml

@@ -70,6 +70,46 @@ spec:
               description: MachineSpec defines the desired state of Machine
               type: object
               properties:
+                lifecycleHooks:
+                  description: LifecycleHooks allow users to pause operations on the machine at certain predefined points within the machine lifecycle.
+                  type: object
+                  properties:
+                    preDrain:
+                      description: PreDrain hooks prevent the machine from being drained. This also blocks further lifecycle events, such as termination.
+                      type: array
+                      items:
+                        description: LifecycleHook represents a single instance of a lifecycle hook
+                        type: object
+                        properties:
+                          name:
+                            description: Name defines a unique name for the lifcycle hook. The name should be unique and descriptive, ideally 1-3 words, in CamelCase or it may be namespaced, eg. foo.example.com/CamelCase. Names must be unique and should only be managed by a single entity.
+                            type: string
+                            maxLength: 256
+                            minLength: 3
+                            pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                          owner:
+                            description: Owner defines the owner of the lifecycle hook. This should be descriptive enough so that users can identify who/what is responsible for blocking the lifecycle. This could be the name of a controller (e.g. clusteroperator/etcd) or an administrator managing the hook.
+                            type: string
+                            maxLength: 512
+                            minLength: 3
+                    preTerminate:
+                      description: PreTerminate hooks prevent the machine from being terminated. PreTerminate hooks be actioned after the Machine has been drained.
+                      type: array
+                      items:
+                        description: LifecycleHook represents a single instance of a lifecycle hook
+                        type: object
+                        properties:
+                          name:
+                            description: Name defines a unique name for the lifcycle hook. The name should be unique and descriptive, ideally 1-3 words, in CamelCase or it may be namespaced, eg. foo.example.com/CamelCase. Names must be unique and should only be managed by a single entity.
+                            type: string
+                            maxLength: 256
+                            minLength: 3
+                            pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                          owner:
+                            description: Owner defines the owner of the lifecycle hook. This should be descriptive enough so that users can identify who/what is responsible for blocking the lifecycle. This could be the name of a controller (e.g. clusteroperator/etcd) or an administrator managing the hook.
+                            type: string
+                            maxLength: 512
+                            minLength: 3
                 metadata:
                   description: ObjectMeta will autopopulate the Node created. Use this to indicate what labels, annotations, name prefix, etc., should be used when creating the Node.
                   type: object

machine/v1beta1/0000_10_machineset.crd.yaml

@@ -163,6 +163,46 @@ spec:
                       description: 'Specification of the desired behavior of the machine. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status'
                       type: object
                       properties:
+                        lifecycleHooks:
+                          description: LifecycleHooks allow users to pause operations on the machine at certain predefined points within the machine lifecycle.
+                          type: object
+                          properties:
+                            preDrain:
+                              description: PreDrain hooks prevent the machine from being drained. This also blocks further lifecycle events, such as termination.
+                              type: array
+                              items:
+                                description: LifecycleHook represents a single instance of a lifecycle hook
+                                type: object
+                                properties:
+                                  name:
+                                    description: Name defines a unique name for the lifcycle hook. The name should be unique and descriptive, ideally 1-3 words, in CamelCase or it may be namespaced, eg. foo.example.com/CamelCase. Names must be unique and should only be managed by a single entity.
+                                    type: string
+                                    maxLength: 256
+                                    minLength: 3
+                                    pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                                  owner:
+                                    description: Owner defines the owner of the lifecycle hook. This should be descriptive enough so that users can identify who/what is responsible for blocking the lifecycle. This could be the name of a controller (e.g. clusteroperator/etcd) or an administrator managing the hook.
+                                    type: string
+                                    maxLength: 512
+                                    minLength: 3
+                            preTerminate:
+                              description: PreTerminate hooks prevent the machine from being terminated. PreTerminate hooks be actioned after the Machine has been drained.
+                              type: array
+                              items:
+                                description: LifecycleHook represents a single instance of a lifecycle hook
+                                type: object
+                                properties:
+                                  name:
+                                    description: Name defines a unique name for the lifcycle hook. The name should be unique and descriptive, ideally 1-3 words, in CamelCase or it may be namespaced, eg. foo.example.com/CamelCase. Names must be unique and should only be managed by a single entity.
+                                    type: string
+                                    maxLength: 256
+                                    minLength: 3
+                                    pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$
+                                  owner:
+                                    description: Owner defines the owner of the lifecycle hook. This should be descriptive enough so that users can identify who/what is responsible for blocking the lifecycle. This could be the name of a controller (e.g. clusteroperator/etcd) or an administrator managing the hook.
+                                    type: string
+                                    maxLength: 512
+                                    minLength: 3
                         metadata:
                           description: ObjectMeta will autopopulate the Node created. Use this to indicate what labels, annotations, name prefix, etc., should be used when creating the Node.
                           type: object

machine/v1beta1/types_machine.go

@@ -167,6 +167,11 @@ type MachineSpec struct {
 	// +optional
 	ObjectMeta `json:"metadata,omitempty"`
 
+	// LifecycleHooks allow users to pause operations on the machine at
+	// certain predefined points within the machine lifecycle.
+	// +optional
+	LifecycleHooks LifecycleHooks `json:"lifecycleHooks,omitempty"`
+
 	// The list of the taints to be applied to the corresponding Node in additive
 	// manner. This list will not overwrite any other taints added to the Node on
 	// an ongoing basis by other entities. These taints should be actively reconciled
@@ -194,6 +199,43 @@ type MachineSpec struct {
 	ProviderID *string `json:"providerID,omitempty"`
 }
 
+// LifecycleHooks allow users to pause operations on the machine at
+// certain prefedined points within the machine lifecycle.
+type LifecycleHooks struct {
+	// PreDrain hooks prevent the machine from being drained.
+	// This also blocks further lifecycle events, such as termination.
+	// +optional
+	PreDrain []LifecycleHook `json:"preDrain,omitempty"`
+
+	// PreTerminate hooks prevent the machine from being terminated.
+	// PreTerminate hooks be actioned after the Machine has been drained.
+	// +optional
+	PreTerminate []LifecycleHook `json:"preTerminate,omitempty"`
+}
+
+// LifecycleHook represents a single instance of a lifecycle hook
+type LifecycleHook struct {
+	// Name defines a unique name for the lifcycle hook.
+	// The name should be unique and descriptive, ideally 1-3 words, in CamelCase or
+	// it may be namespaced, eg. foo.example.com/CamelCase.
+	// Names must be unique and should only be managed by a single entity.
+	// +kubebuilder:validation:Pattern=`^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])$`
+	// +kubebuilder:validation:MinLength:=3
+	// +kubebuilder:validation:MaxLength:=256
+	// +required
+	Name string `json:"name"`
+
+	// Owner defines the owner of the lifecycle hook.
+	// This should be descriptive enough so that users can identify
+	// who/what is responsible for blocking the lifecycle.
+	// This could be the name of a controller (e.g. clusteroperator/etcd)
+	// or an administrator managing the hook.
+	// +kubebuilder:validation:MinLength:=3
+	// +kubebuilder:validation:MaxLength:=512
+	// +required
+	Owner string `json:"owner"`
+}
+
 // MachineStatus defines the observed state of Machine
 type MachineStatus struct {
 	// NodeRef will point to the corresponding Node if it exists.

machine/v1beta1/types_provider.go

@@ -144,6 +144,15 @@ const (
 	// ExternalRemediationRequestAvailable is set on machinehealthchecks when MachineHealthCheck controller uses external remediation.
 	// ExternalRemediationRequestAvailable is set to false if creating external remediation request fails.
 	ExternalRemediationRequestAvailable ConditionType = "ExternalRemediationRequestAvailable"
+	// MachineDrained is set on a machine to indicate that the machine has been drained. When an error occurs during
+	// the drain process, the condition will be added with a false status and details of the error.
+	MachineDrained ConditionType = "Drained"
+	// MachineDrainable is set on a machine to indicate whether or not the machine can be drained, or, whether some
+	// deletion hook is blocking the drain operation.
+	MachineDrainable ConditionType = "Drainable"
+	// MachineTerminable is set on a machine to indicate whether or not the machine can be terminated, or, whether some
+	// deletion hook is blocking the termination operation.
+	MachineTerminable ConditionType = "Terminable"
 )
 
 const (
@@ -165,6 +174,12 @@ const (
 	ExternalRemediationTemplateNotFound = "ExternalRemediationTemplateNotFound"
 	// ExternalRemediationRequestCreationFailed is the reason used when a machine health check fails to create external remediation request.
 	ExternalRemediationRequestCreationFailed = "ExternalRemediationRequestCreationFailed"
+	// MachineHookPresent indicates that a machine lifecycle hook is blocking part of the lifecycle of the machine.
+	// This should be used with the `Drainable` and `Terminable` machine condition types.
+	MachineHookPresent = "HookPresent"
+	// MachineDrainError indicates an error occurred when draining the machine.
+	// This should be used with the `Drained` condition type.
+	MachineDrainError = "DrainError"
 )
 
 // Condition defines an observation of a Machine API resource operational state.