chore: update operator codegen to match ingress-operator

Add `.tools` folder and update the make target so that we used a pinned
version of the code-generator from the module cache.

Signed-off-by: Lucas Roesler <[email protected]>

.tools/README.md

@@ -0,0 +1,8 @@
+# Tools folder
+
+The tools folder allows us a space to define and pin external dependencies. If they are go based tools we can create individual `mod` files that allow us to download or install these tools independent of the main package.
+
+## Tools
+
+1. `k8s.io/code-gen` this package needs to be _downloaded_ not installed. But we can not use the copy created in the `vendor` folder because vendor does not make a complete clone, it only keeps the Go files, and the code-gen project has several bash scripts that we need to reference.
+The main project `Makefile` will attempt to keep the `code-generator.mod` file in sync with the `go.mod`. It should not need to be manually edited, but it does need to be committed.

.tools/code-generator.mod

@@ -0,0 +1,7 @@
+module _ // Fake module so that we can install code-generator separate from the project
+
+go 1.16
+
+require (
+    k8s.io/code-generator v0.18.2
+)

.tools/code-generator.sum

@@ -0,0 +1,90 @@
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Makefile

@@ -3,8 +3,22 @@ TAG?=latest
 OWNER?=openfaas
 export DOCKER_CLI_EXPERIMENTAL=enabled
 
+TOOLS_DIR := .tools
+
+GOPATH := $(shell go env GOPATH)
+CODEGEN_VERSION := $(shell hack/print-codegen-version.sh)
+CODEGEN_PKG := $(GOPATH)/pkg/mod/k8s.io/code-generator@${CODEGEN_VERSION}
+
 all: build-docker
 
+$(TOOLS_DIR)/code-generator.mod: go.mod
+	@echo "syncing code-generator tooling version"
+	@cd $(TOOLS_DIR) && go mod edit -require "k8s.io/code-generator@${CODEGEN_VERSION}"
+
+${CODEGEN_PKG}: $(TOOLS_DIR)/code-generator.mod
+	@echo "(re)installing k8s.io/code-generator-${CODEGEN_VERSION}"
+	@cd $(TOOLS_DIR) && go mod download -modfile=code-generator.mod
+
 local:
 	CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o faas-netes
 
@@ -71,3 +85,11 @@ start-kind: ## attempt to start a new dev environment
 
 stop-kind: ## attempt to stop the dev environment
 	@./contrib/stop_dev.sh
+
+.PHONY: verify-codegen
+verify-codegen: ${CODEGEN_PKG}
+	./hack/verify-codegen.sh
+
+.PHONY: update-codegen
+update-codegen: ${CODEGEN_PKG}
+	./hack/update-codegen.sh

hack/boilerplate.go.txt

@@ -1,5 +1,5 @@
 /*
-Copyright 2019-2020 OpenFaaS Authors
+Copyright 2019-2021 OpenFaaS Authors
 
 Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */

hack/print-codegen-version.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# This scripts exists primarily so that it can be used in the Makefile.
+# It is needed because the `($shell ...)` command was having issues with the pipe.
+# Extracting it to a script was the simplest solution.
+
+grep 'k8s.io/code-generator' go.mod | awk '{print $2}'

hack/update-crds.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 export controllergen="$GOPATH/bin/controller-gen"
-export PKG=sigs.k8s.io/controller-tools/cmd/controller-gen
+export PKG=sigs.k8s.io/controller-tools/cmd/controller-gen@v0.6.2
 
 if [ ! -e "$gen" ]
 then