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Add example for provider specific functions
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‎Makefile

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# limitations under the License.
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CMDS_DIR=example
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CMDS=hello-populator
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CMDS ?= hello-populator
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all: build
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include release-tools/build.make

‎example/provider-populator/Dockerfile

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FROM gcr.io/distroless/static:latest
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LABEL maintainers="Kubernetes Authors"
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LABEL description="provider populator"
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ARG binary=./provider-populator
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COPY ${binary} provider-populator
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ENTRYPOINT ["/provider-populator"]

‎example/provider-populator/README.md

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# Provider Populator Example
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This example demonstrates an extremely simple provider specific populator implementation.
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## How To
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Install kubernetes 1.33 or later
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Install the CRD:
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`kubectl apply -f crd.yaml`
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Install the controller:
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`kubectl apply -f deploy.yaml`
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Create a CR:
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```
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kubectl create -f - << EOF
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apiVersion: provider.example.com/v1alpha1
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kind: Provider
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metadata:
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name: provider1
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spec:
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dataSourceName: example-source
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EOF
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```
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Create a PVC:
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```
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kubectl create -f - << EOF
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: pvc1
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 10Mi
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dataSourceRef:
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apiGroup: provider.example.com
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kind: Provider
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name: provider1
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EOF
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```
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Get the logs from the pod to verify that controller starts:
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`kubectl get pod -n provider`
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```
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NAME READY STATUS RESTARTS AGE
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provider-populator-7f6c786fb5-q2vsq 1/1 Running 0 11s
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```
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`kubectl logs provider-populator-7f6c786fb5-q2vsq -n provider`
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```
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I0331 08:06:03.602113 1 controller.go:236] Starting populator controller for Provider.provider.example.com
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W0331 08:06:03.604038 1 client_config.go:667] Neither --kubeconfig nor --master was specified. Using the inClusterConfig. This might not work.
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I0331 08:06:03.606450 1 metrics.go:109] Metrics path successfully registered at /metrics
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I0331 08:06:03.606920 1 metrics.go:121] Metrics http server successfully started on :8080, /metrics
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```
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### To build the image from code:
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`make all CMDS=provider-populator`
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Make sure you have a repo you can push to, and set the variable
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`YOUR_REPO=...`
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Push the image to your repo:
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```
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docker tag provider-populator:latest ${YOUR_REPO}/provider-populator:latest
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docker push ${YOUR_REPO}/provider-populator:latest
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```
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To use the image, update deploy.yaml before installing the controller.

‎example/provider-populator/crd.yaml

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apiVersion: apiextensions.k8s.io/v1
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kind: CustomResourceDefinition
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metadata:
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name: providers.provider.example.com
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spec:
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group: provider.example.com
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names:
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kind: Provider
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listKind: ProviderList
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plural: providers
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singular: provider
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scope: Namespaced
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versions:
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- name: v1alpha1
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schema:
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openAPIV3Schema:
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description: Provider is a specification for a Provider resource
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properties:
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spec:
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description: ProviderSpec is the spec for a Provider resource
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properties:
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dataSourceName:
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type: string
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# Add provider specific data source properties
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type: object
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required:
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- spec
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type: object
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served: true
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storage: true
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status:
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acceptedNames:
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kind: ""
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plural: ""
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conditions: []
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storedVersions: []

‎example/provider-populator/deploy.yaml

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apiVersion: v1
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kind: Namespace
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metadata:
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name: provider
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---
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: provider-account
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namespace: provider
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---
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kind: ClusterRole
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apiVersion: rbac.authorization.k8s.io/v1
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metadata:
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name: provider-role
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rules:
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- apiGroups: [""]
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resources: [persistentvolumes]
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verbs: [get, list, watch, patch]
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- apiGroups: [""]
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resources: [persistentvolumeclaims]
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verbs: [get, list, watch, patch, create, delete]
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- apiGroups: [""]
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resources: [pods]
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verbs: [get, list, watch, create, delete]
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- apiGroups: [""]
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resources: [events]
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verbs: [create]
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- apiGroups: [storage.k8s.io]
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resources: [storageclasses]
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verbs: [get, list, watch]
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- apiGroups: [provider.example.com]
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resources: [providers]
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verbs: [get, list, watch]
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# (Alpha) Access to referencegrants is only needed when the CSI driver
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# has the CrossNamespaceVolumeDataSource controller capability.
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# In that case, lib-volume-populator requires "get", "list", "watch"
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# permissions for "referencegrants" on "gateway.networking.k8s.io".
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#- apiGroups: ["gateway.networking.k8s.io"]
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# resources: ["referencegrants"]
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# verbs: ["get", "list", "watch"]
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---
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kind: ClusterRoleBinding
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apiVersion: rbac.authorization.k8s.io/v1
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metadata:
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name: provider-binding
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subjects:
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- kind: ServiceAccount
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name: provider-account
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namespace: provider
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roleRef:
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kind: ClusterRole
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name: provider-role
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apiGroup: rbac.authorization.k8s.io
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---
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kind: Deployment
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apiVersion: apps/v1
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metadata:
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name: provider-populator
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namespace: provider
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spec:
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selector:
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matchLabels:
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app: provider
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template:
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metadata:
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labels:
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app: provider
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spec:
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serviceAccount: provider-account
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containers:
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- name: provider
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image: gcr.io/dannawang-gke-dev/provider-populator:v1.0.1
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imagePullPolicy: IfNotPresent
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args:
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- --mode=controller
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- --http-endpoint=:8080
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ports:
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- containerPort: 8080
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name: http-endpoint
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protocol: TCP
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---
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kind: VolumePopulator
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apiVersion: populator.storage.k8s.io/v1beta1
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metadata:
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name: provider-populator
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sourceKind:
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group: provider.example.com
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kind: provider

‎example/provider-populator/main.go

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package main
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import (
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"context"
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"flag"
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populatorMachinery "github.com/kubernetes-csi/lib-volume-populator/populator-machinery"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/klog/v2"
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)
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const (
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groupName = "provider.example.com"
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kind = "Provider"
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apiVersion = "v1alpha1"
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resource = "providers"
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prefix = "provider.example.com"
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)
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var (
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namespace = flag.String("namespace", "provider-populator", "Namespace to deploy controller")
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mode = flag.String("mode", "controller", "Mode to run the application in, supported values is controller")
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kubeconfigPath = flag.String("kubeconfig-path", "", "kubeconfig path")
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httpEndpoint = flag.String("http-endpoint", "", "The TCP network address where the HTTP server for diagnostics, including metrics and leader election health check, will listen (example: `:8080`). The default is empty string.")
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metricsPath = flag.String("metrics-path", "/metrics", "The HTTP path where prometheus metrics will be exposed. Default is `/metrics`.")
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groupKind = schema.GroupKind{
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Group: groupName,
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Kind: kind,
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}
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versionResource = schema.GroupVersionResource{
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Group: groupKind.Group,
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Version: apiVersion,
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Resource: resource,
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}
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)
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func main() {
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klog.InitFlags(nil)
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flag.Parse()
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switch *mode {
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case "controller":
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klog.Infof("Run provider-populator controller")
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pfcfg := &populatorMachinery.ProviderFunctionConfig{
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PopulateFn: populateFn,
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PopulateCompleteFn: populateCompleteFn,
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PopulateCleanupFn: populateCleanupFn,
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}
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vpcfg := &populatorMachinery.VolumePopulatorConfig{
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MasterURL: "",
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Kubeconfig: *kubeconfigPath,
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HttpEndpoint: *httpEndpoint,
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MetricsPath: *metricsPath,
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Namespace: *namespace,
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Prefix: prefix,
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Gk: groupKind,
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Gvr: versionResource,
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ProviderFunctionConfig: pfcfg,
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CrossNamespace: false,
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}
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populatorMachinery.RunControllerWithConfig(*vpcfg)
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default:
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klog.Infof("Mode %s is not supported", *mode)
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}
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}
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func populateFn(ctx context.Context, params populatorMachinery.PopulatorParams) error {
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// Implement the provider-specific logic to initiate volume population.
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// This may involve calling cloud-native APIs or creating temporary Kubernetes resources
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// such as Pods or Jobs for data transfer.
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klog.Infof("Run populateFn")
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return nil
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}
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func populateCompleteFn(ctx context.Context, params populatorMachinery.PopulatorParams) (bool, error) {
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// Implement the provider-specific logic to determine the status of volume population.
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// This may involve calling cloud-native APIs or checking the completion status of
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// temporary Kubernetes resources like Pods or Jobs.
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klog.Infof("Run populateCompleteFn")
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return true, nil
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}
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func populateCleanupFn(ctx context.Context, params populatorMachinery.PopulatorParams) error {
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// Implement the provider-specific logic to clean up any temporary resources
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// that were created during the volume population process.
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klog.Infof("Run populateCleanupFn")
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return nil
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}

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