API: generate code-gen style helpers

As the FRR-K8s api is meant to be consumed by other controllers, we
export the helpers so a pre-controller runtime controller can consume
it.

Note: the "core" symlink is to get around
kubernetes/code-generator#167

Signed-off-by: Federico Paolinelli <fpaoline@redhat.com>

api/v1beta1/frrconfiguration_types.go

@@ -307,6 +307,8 @@ type FRRConfigurationStatus struct {
 
 //+kubebuilder:object:root=true
 //+kubebuilder:subresource:status
+//nolint
+//+genclient
 
 // FRRConfiguration is a piece of FRR configuration.
 type FRRConfiguration struct {

api/v1beta1/groupversion_info.go

@@ -34,3 +34,9 @@ var (
 	// AddToScheme adds the types in this group-version to the given scheme.
 	AddToScheme = SchemeBuilder.AddToScheme
 )
+
+var SchemeGroupVersion = schema.GroupVersion{Group: "frrk8s.metallb.io", Version: "v1beta1"}
+
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}

core

@@ -0,0 +1 @@
+api

go.mod

@@ -34,6 +34,7 @@ require (
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.4.0 // indirect
 	github.com/emicklei/go-restful/v3 v3.12.1 // indirect
+	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
 	github.com/evanphx/json-patch/v5 v5.9.0 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect

hack/boilerplate.go.txt

@@ -1,15 +1 @@
-/*
-Copyright 2023.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
+// SPDX-License-Identifier:Apache-2.0

hack/update-codegen.sh

@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+
+# Copyright 2020 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Strongly "inspired" by https://github.com/kubernetes-sigs/gateway-api/blob/1b14708b143e837fd94be97698ecbe0e6a4e058d/hack/update-codegen.sh
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+readonly SCRIPT_ROOT="$(cd "$(dirname "${BASH_SOURCE}")"/.. && pwd)"
+
+# Keep outer module cache so we don't need to redownload them each time.
+# The build cache already is persisted.
+readonly GOMODCACHE="$(go env GOMODCACHE)"
+readonly GO111MODULE="on"
+readonly GOFLAGS="-mod=readonly"
+readonly GOPATH="$(mktemp -d)"
+readonly MIN_REQUIRED_GO_VER="$(go list -m -f '{{.GoVersion}}')"
+
+function go_version_matches {
+  go version | perl -ne "exit 1 unless m{go version go([0-9]+.[0-9]+)}; exit 1 if (\$1 < ${MIN_REQUIRED_GO_VER})"
+  return $?
+}
+
+if ! go_version_matches; then
+  echo "Go v${MIN_REQUIRED_GO_VER} or later is required to run code generation"
+  exit 1
+fi
+
+export GOMODCACHE GO111MODULE GOFLAGS GOPATH
+
+# Even when modules are enabled, the code-generator tools always write to
+# a traditional GOPATH directory, so fake on up to point to the current
+# workspace.
+mkdir -p "$GOPATH/src/github.com/metallb"
+ln -s "${SCRIPT_ROOT}" "$GOPATH/src/github.com/metallb/frr-k8s"
+
+echo $GOPATH
+readonly OUTPUT_PKG=github.com/metallb/frr-k8s/pkg/client
+readonly APIS_PKG=github.com/metallb/frr-k8s
+readonly CLIENTSET_NAME=versioned
+readonly CLIENTSET_PKG_NAME=clientset
+readonly VERSIONS=(v1beta1)
+
+INPUT_DIRS_SPACE=""
+INPUT_DIRS_COMMA=""
+for VERSION in "${VERSIONS[@]}"
+do
+  INPUT_DIRS_SPACE+="${APIS_PKG}/api/${VERSION} "
+  INPUT_DIRS_COMMA+="${APIS_PKG}/api/${VERSION},"
+done
+INPUT_DIRS_SPACE="${INPUT_DIRS_SPACE%,}" # drop trailing space
+INPUT_DIRS_COMMA="${INPUT_DIRS_COMMA%,}" # drop trailing comma
+
+
+if [[ "${VERIFY_CODEGEN:-}" == "true" ]]; then
+  echo "Running in verification mode"
+  readonly VERIFY_FLAG="--verify-only"
+fi
+
+readonly COMMON_FLAGS="${VERIFY_FLAG:-} --go-header-file ${SCRIPT_ROOT}/hack/boilerplate.go.txt"
+
+# throw away
+new_report="$(mktemp -t "$(basename "$0").api_violations.XXXXXX")"
+
+
+# TEMPORARY FIX (sure!) until https://github.com/kubernetes/kubernetes/pull/125162
+# lands on a tagged release. See also https://github.com/kubernetes/code-generator/issues/167
+rm core || true
+ln -s api core
+
+echo "Generating clientset at ${OUTPUT_PKG}/${CLIENTSET_PKG_NAME}"
+go run k8s.io/code-generator/cmd/client-gen@v0.30.2 \
+  --clientset-name "${CLIENTSET_NAME}" \
+  --input-base "${APIS_PKG}" \
+  --input "${INPUT_DIRS_COMMA//${APIS_PKG}/}" \
+  --output-dir "pkg/client/${CLIENTSET_PKG_NAME}" \
+  --output-pkg "${OUTPUT_PKG}/${CLIENTSET_PKG_NAME}" \
+  ${COMMON_FLAGS}
+
+echo "Generating listers at ${OUTPUT_PKG}/listers"
+go run k8s.io/code-generator/cmd/lister-gen@v0.30.2 \
+  --output-dir "pkg/client/listers" \
+  --output-pkg "${OUTPUT_PKG}/listers" \
+  ${COMMON_FLAGS} \
+  ${INPUT_DIRS_SPACE}
+
+echo "Generating informers at ${OUTPUT_PKG}/informers"
+go run k8s.io/code-generator/cmd/informer-gen@v0.30.2 \
+  --versioned-clientset-package "${OUTPUT_PKG}/${CLIENTSET_PKG_NAME}/${CLIENTSET_NAME}" \
+  --listers-package "${OUTPUT_PKG}/listers" \
+  --output-dir "pkg/client/informers" \
+  --output-pkg "${OUTPUT_PKG}/informers" \
+  ${COMMON_FLAGS} \
+  ${INPUT_DIRS_SPACE}