[experiments] Introduce Cozystack CRD + controller

Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>

Makefile

@@ -57,3 +57,6 @@ generate:
 
 upload_assets: manifests
 	hack/upload-assets.sh
+
+controller-gen:
+	controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./internal/controller/" paths="./api/v1alpha1/"

api/v1alpha1/cozystack_types.go

@@ -0,0 +1,26 @@
+package v1alpha1
+
+import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+// +kubebuilder:object:root=true
+
+// Cozystack is the Schema for the Cozystack API
+type Cozystack struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	//Status CozystackStatus `json:"status,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// WorkloadList contains a list of Workload
+type CozystackList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []Cozystack `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&Cozystack{}, &CozystackList{})
+}

api/v1alpha1/zz_generated.deepcopy.go

@@ -25,6 +25,63 @@ import (
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Cozystack) DeepCopyInto(out *Cozystack) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Cozystack.
+func (in *Cozystack) DeepCopy() *Cozystack {
+	if in == nil {
+		return nil
+	}
+	out := new(Cozystack)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *Cozystack) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *CozystackList) DeepCopyInto(out *CozystackList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]Cozystack, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new CozystackList.
+func (in *CozystackList) DeepCopy() *CozystackList {
+	if in == nil {
+		return nil
+	}
+	out := new(CozystackList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *CozystackList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in Selector) DeepCopyInto(out *Selector) {
 	{

cmd/cozystack-controller/main.go

@@ -206,6 +206,14 @@ func main() {
 		os.Exit(1)
 	}
 
+	if err = (&controller.CozystackReconciler{
+		Client: mgr.GetClient(),
+		Scheme: mgr.GetScheme(),
+	}).SetupWithManager(mgr); err != nil {
+		setupLog.Error(err, "unable to create controller", "controller", "CozystackConfigReconciler")
+		os.Exit(1)
+	}
+
 	// +kubebuilder:scaffold:builder
 
 	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {

internal/controller/cozystack_controller.go

@@ -0,0 +1,52 @@
+package controller
+
+import (
+	"context"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+
+	cozyv1alpha1 "github.com/cozystack/cozystack/api/v1alpha1"
+)
+
+type CozystackReconciler struct {
+	client.Client
+	Scheme *runtime.Scheme
+}
+
+func (r *CozystackReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	l := log.FromContext(ctx)
+	c := &cozyv1alpha1.Cozystack{}
+
+	if err := r.Get(ctx, req.NamespacedName, c); err != nil {
+		if apierrors.IsNotFound(err) {
+			return ctrl.Result{}, nil
+		}
+		l.Error(err, "Unable to fetch Cozystack")
+		return ctrl.Result{}, err
+	}
+
+	if !c.DeletionTimestamp.IsZero() {
+		return ctrl.Result{}, nil
+	}
+
+	if c.Name != "cozystack" || c.Namespace != "cozy-system" {
+		l.Info("only cozy-system/cozystack Cozystack is allowed in a cluster")
+		err := r.Delete(ctx, c)
+		if err != nil {
+			l.Error(err, "Unable to delete invalid Cozystack")
+		}
+		return ctrl.Result{}, err
+	}
+
+	panic("not implemented")
+}
+
+func (r *CozystackReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&cozyv1alpha1.Cozystack{}).
+		Complete(r)
+}