Add golang version check to verify

This makes sure that we are not exceeding our golang version
Supported golang version is 1.22.5

Signed-off-by: Todd Short <tshort@redhat.com>

Author: tmshort

Makefile

@@ -7,6 +7,7 @@ SHELL := /usr/bin/env bash -o pipefail
 .SHELLFLAGS := -ec
 export ROOT_DIR := $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
 
+GOLANG_VERSION := 1.22.5
 # Image URL to use all building/pushing image targets
 ifeq ($(origin IMAGE_REPO), undefined)
 IMAGE_REPO := quay.io/operator-framework/operator-controller
@@ -95,7 +96,7 @@ lint: $(GOLANGCI_LINT) #HELP Run golangci linter.
 
 .PHONY: tidy
 tidy: #HELP Update dependencies.
-	$(Q)go mod tidy
+	$(Q)go mod tidy -go=$(GOLANG_VERSION)
 
 .PHONY: manifests
 manifests: $(CONTROLLER_GEN) #EXHELP Generate WebhookConfiguration, ClusterRole and CustomResourceDefinition objects.
@@ -105,8 +106,12 @@ manifests: $(CONTROLLER_GEN) #EXHELP Generate WebhookConfiguration, ClusterRole
 generate: $(CONTROLLER_GEN) #EXHELP Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations.
 	$(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."
 
+.PHONY: go-verify
+go-verify:
+	hack/tools/check-go-version.sh $(GOLANG_VERSION)
+
 .PHONY: verify
-verify: tidy fmt vet generate manifests crd-ref-docs #HELP Verify all generated code is up-to-date.
+verify: tidy fmt vet generate manifests crd-ref-docs go-verify #HELP Verify all generated code is up-to-date.
 	git diff --exit-code
 
 .PHONY: fix-lint

hack/tools/check-go-version.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+GO_VER=$1
+OLDIFS="${IFS}"
+IFS='.' vers=(${GO_VER})
+IFS="${OLDIFS}"
+
+if [ ${#vers[*]} -ne 3 -a ${#vers[*]} -ne 2 ]; then
+    echo "Invalid go version: ${GO_VER}"
+    exit 1
+fi
+
+GO_MAJOR=${vers[0]}
+GO_MINOR=${vers[1]}
+GO_PATCH=${vers[2]}
+
+if [ ${#vers[*]} -eq 2 ]; then
+    CHECK_FOR_2=1
+else
+    CHECK_FOR_2=0
+fi
+
+
+check_version () {
+    whole=$1
+    file=$2
+    OLDIFS="${IFS}"
+    IFS='.' ver=(${whole})
+    IFS="${OLDIFS}"
+
+    if [ ${#ver[*]} -eq 2 ] ; then
+        if [ ${ver[0]} -gt ${GO_MAJOR} ] ; then
+            echo "Bad golang version ${whole} in ${file} (expected ${GO_VER} or less)"
+            exit 1
+        fi
+        if [ ${ver[1]} -gt ${GO_MINOR} ] ; then
+            echo "Bad golang version ${whole} in ${file} (expected ${GO_VER} or less)"
+            exit 1
+        fi
+        echo "Version ${whole} in ${file} is good"
+        return
+    fi
+    if [ ${CHECK_FOR_2} -eq 1 ]; then
+        echo "Bad golang version ${whole} in ${file} (expecting only major.minor version)"
+        exit 1
+    fi
+    if [ ${#ver[*]} -ne 3 ] ; then
+        echo "Badly formatted golang version ${whole} in ${file}"
+        exit 1
+    fi
+
+    if [ ${ver[0]} -gt ${GO_MAJOR} ]; then
+        echo "Bad golang version ${whole} in ${file} (expected ${GO_VER} or less)"
+        exit 1
+    fi
+    if [ ${ver[1]} -gt ${GO_MINOR} ]; then
+        echo "Bad golang version ${whole} in ${file} (expected ${GO_VER} or less)"
+        exit 1
+    fi
+    if [ ${ver[1]} -eq ${GO_MINOR} -a ${ver[2]} -gt ${GO_PATCH} ]; then
+        echo "Bad golang version ${whole} in ${file} (expected ${GO_VER} or less)"
+        exit 1
+    fi
+    echo "Version ${whole} in ${file} is good"
+}
+
+for f in $(find . -name "*.mod"); do
+    v=$(sed -En 's/^go (.*)$/\1/p' ${f})
+    if [ -z ${v} ]; then
+        echo "Skipping ${f}: no version found"
+    else
+        check_version ${v} ${f}
+    fi
+done