PoC: Fetch hypervisor objects across multiple remote kubernetes clusters

Dockerfile.kubebuilder

@@ -4,6 +4,8 @@ ARG TARGETOS
 ARG TARGETARCH
 # Path of our go.mod
 ARG GO_MOD_PATH=.
+ARG GO_MAIN_PATH=cmd/main.go
+ENV GO_MAIN_PATH=${GO_MAIN_PATH}
 ARG GOCACHE=/root/.cache/go-build
 ENV GOCACHE=${GOCACHE}
 
@@ -28,7 +30,7 @@ ENV GOOS=${TARGETOS:-linux}
 ENV GOARCH=${TARGETARCH}
 RUN --mount=type=cache,target=/go/pkg/mod/ \
     --mount=type=cache,target=${GOCACHE} \
-    go build -a -o manager cmd/main.go
+    go build -a -o manager ${GO_MAIN_PATH}
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details

Tiltfile

@@ -27,6 +27,16 @@ def kubebuilder_binary_files(path):
     """
     return [path + '/cmd', path + '/api', path + '/internal', path + '/go.mod', path + '/go.sum']
 
+########### Hypervisors kubernetes client demo
+docker_build('ghcr.io/cobaltcore-dev/cortex-hypervisors-demo', '.',
+    dockerfile='Dockerfile.kubebuilder',
+    build_args={'GO_MOD_PATH': 'hypervisors', 'GO_MAIN_PATH': '.'},
+    only=['hypervisors/', 'internal/', 'go.mod', 'go.sum'],
+)
+local('sh helm/sync.sh hypervisors/demo/chart')
+k8s_yaml(helm('hypervisors/demo/chart', name='cortex-hypervisors-demo', values=[tilt_values]))
+k8s_resource('demo', labels=['Demo'])
+
 ########### Reservations Operator & CRDs
 docker_build('ghcr.io/cobaltcore-dev/cortex-reservations-operator', '.',
     dockerfile='Dockerfile.kubebuilder',

hypervisors/demo/chart/.helmignore

@@ -0,0 +1,25 @@
+# Patterns to ignore when building Helm packages.
+# Operating system files
+.DS_Store
+
+# Version control directories
+.git/
+.gitignore
+.bzr/
+.hg/
+.hgignore
+.svn/
+
+# Backup and temporary files
+*.swp
+*.tmp
+*.bak
+*.orig
+*~
+
+# IDE and editor-related files
+.idea/
+.vscode/
+
+# Helm chart artifacts
+dist/chart/*.tgz

hypervisors/demo/chart/Chart.lock

@@ -0,0 +1,6 @@
+dependencies:
+- name: owner-info
+  repository: oci://ghcr.io/sapcc/helm-charts
+  version: 1.0.0
+digest: sha256:7643f231cc4ebda347fd12ec62fe4445c280e2b71d27eec555f3025290f5038f
+generated: "2025-08-26T10:55:05.888651+02:00"

hypervisors/demo/chart/Chart.yaml

@@ -0,0 +1,14 @@
+apiVersion: v2
+name: cortex-hypervisors-client-demo
+description: A Helm chart to distribute the cortex hypervisors client demo.
+type: application
+version: 0.1.0
+appVersion: "latest"
+icon: "https://example.com/icon.png"
+dependencies:
+  # Owner info adds a configmap to the kubernetes cluster with information on
+  # the service owner. This makes it easier to find out who to contact in case
+  # of issues. See: https://github.com/sapcc/helm-charts/pkgs/container/helm-charts%2Fowner-info
+  - name: owner-info
+    repository: oci://ghcr.io/sapcc/helm-charts
+    version: 1.0.0

hypervisors/demo/chart/templates/_helpers.tpl

@@ -0,0 +1,50 @@
+{{- define "chart.name" -}}
+{{- if .Chart }}
+  {{- if .Chart.Name }}
+    {{- .Chart.Name | trunc 63 | trimSuffix "-" }}
+  {{- else if .Values.nameOverride }}
+    {{ .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+  {{- else }}
+    reservations
+  {{- end }}
+{{- else }}
+  reservations
+{{- end }}
+{{- end }}
+
+
+{{- define "chart.labels" -}}
+{{- if .Chart.AppVersion -}}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+{{- if .Chart.Version }}
+helm.sh/chart: {{ .Chart.Version | quote }}
+{{- end }}
+app.kubernetes.io/name: {{ include "chart.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+
+{{- define "chart.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "chart.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+
+{{- define "chart.hasMutatingWebhooks" -}}
+{{- $hasMutating := false }}
+{{- range . }}
+  {{- if eq .type "mutating" }}
+    $hasMutating = true }}{{- end }}
+{{- end }}
+{{ $hasMutating }}}}{{- end }}
+
+
+{{- define "chart.hasValidatingWebhooks" -}}
+{{- $hasValidating := false }}
+{{- range . }}
+  {{- if eq .type "validating" }}
+    $hasValidating = true }}{{- end }}
+{{- end }}
+{{ $hasValidating }}}}{{- end }}

hypervisors/demo/chart/templates/demo.yaml

@@ -0,0 +1,63 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: demo
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "chart.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "chart.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      annotations:
+        kubectl.kubernetes.io/default-container: demo
+      labels:
+        {{- include "chart.labels" . | nindent 8 }}
+    spec:
+      containers:
+        - name: demo
+          command:
+            # Created by kubebuilder Dockerfile
+            - /manager
+          image: {{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}
+          volumeMounts:
+            - name: demo-config-volume
+              mountPath: /etc/config
+            - name: demo-secrets-volume
+              mountPath: /etc/secrets
+              readOnly: true
+      volumes:
+        # Custom values to configure the demo.
+        - name: demo-config-volume
+          configMap:
+            name: demo-config
+        - name: demo-secrets-volume
+          secret:
+            secretName: demo-secrets
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: demo-config
+data:
+  conf.json: |-
+    {{- if .Values.demo.conf }}
+    {{ toJson .Values.demo.conf }}
+    {{- else }}
+    {}
+    {{- end }}
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: demo-secrets
+type: Opaque
+data:
+  secrets.json: |-
+    {{- if .Values.demo.secrets }}
+    {{ toJson .Values.demo.secrets | b64enc }}
+    {{- else }}
+    {{ "{}" | b64enc }}
+    {{- end }}

hypervisors/demo/chart/values.yaml

@@ -0,0 +1,25 @@
+# This file is safe from kubebuilder edit --plugins=helm/v1-alpha
+# If you want to re-generate, add the --force flag.
+
+owner-info:
+  enabled: true
+  helm-chart-url: "https://github.com/cobaltcore-dev/cortex/hypervisors/demo/dist/chart"
+  maintainers:
+    - "[email protected]"
+    - "[email protected]"
+    - "[email protected]"
+  support-group: "workload-management"
+  service: "cortex-hypervisors-demo"
+
+image:
+  repository: ghcr.io/cobaltcore-dev/cortex-hypervisors-demo
+
+demo:
+  # Default configuration.
+  conf: {}
+  # Config provided here will override the config provided above.
+  secrets:
+    apiservers:
+      - host:
+        bearerToken:
+        caCrt:

hypervisors/go.mod

@@ -0,0 +1,54 @@
+module github.com/cobaltcore-dev/cortex/reservations
+
+go 1.25.0
+
+replace github.com/cobaltcore-dev/cortex => ../
+
+require (
+	github.com/cobaltcore-dev/cortex v0.0.0-00010101000000-000000000000
+	github.com/cobaltcore-dev/openstack-hypervisor-operator v0.0.0-20250910084739-09a2101e23e7
+	github.com/sapcc/go-bits v0.0.0-20250911190512-4d3226a57454
+	k8s.io/client-go v0.34.0
+	sigs.k8s.io/controller-runtime v0.22.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
+	github.com/evanphx/json-patch/v5 v5.9.11 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/gnostic-models v0.7.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.9.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/net v0.43.0 // indirect
+	golang.org/x/oauth2 v0.30.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/term v0.34.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/time v0.12.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.34.0 // indirect
+	k8s.io/apimachinery v0.34.1 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20250710124328-f3f2b991d03b // indirect
+	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 // indirect
+	sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 // indirect
+	sigs.k8s.io/randfill v1.0.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
+	sigs.k8s.io/yaml v1.6.0 // indirect
+)