From 9bda1810a6dd73310b0171bfc968046fd68748cc Mon Sep 17 00:00:00 2001
From: Silas <63477128+SilasStokes@users.noreply.github.com>
Date: Sun, 30 Jul 2023 10:10:22 -0700
Subject: [PATCH] validate go version in `make vendor`

---
 Makefile  | 15 ++++++++++++++-
 Readme.md |  2 +-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 647d74c..5eed2cd 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,13 @@ JB_BINARY := $(GOPATH)/bin/jb
 
 JSONNET_FMT := $(GOPATH)/bin/jsonnetfmt -n 2 --max-blank-lines 2 --string-style s --comment-style s
 
+GO_MAJOR_VERSION = $(shell go version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f1)
+GO_MINOR_VERSION = $(shell go version | cut -c 14- | cut -d' ' -f1 | cut -d'.' -f2)
+MINIMUM_SUPPORTED_GO_MAJOR_VERSION = 1
+MINIMUM_SUPPORTED_GO_MINOR_VERSION = 18
+GO_VERSION_VALIDATION_ERR_MSG = Your golang version, $(GO_MAJOR_VERSION).$(GO_MINOR_VERSION), is not supported, \
+								please update to at least $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION).$(MINIMUM_SUPPORTED_GO_MINOR_VERSION).
+
 .PHONY: generate vendor fmt manifests help
 
 all: manifests       ## Builds the  manifests
@@ -24,7 +31,7 @@ docker:        ## Builds the manifests in a Docker container to avoid installing
 update_libs: $(JB_BINARY)        ## Updates vendor libs. Require a regeneration of the manifests
 	$(JB_BINARY) update
 
-vendor: $(JB_BINARY) jsonnetfile.json jsonnetfile.lock.json       ## Download vendor libs
+vendor: validate-go-version $(JB_BINARY) jsonnetfile.json jsonnetfile.lock.json       ## Download vendor libs
 	rm -rf vendor
 	$(JB_BINARY) install
 
@@ -72,3 +79,9 @@ change_suffix:        ## Changes suffix for the ingress. Pass suffix=[suffixURL]
 		mv -f manifests/ingress-$$f.yaml-tmp manifests/ingress-$$f.yaml; \
 		echo ${K3S} kubectl apply -f manifests/ingress-$$f.yaml; \
 	done
+
+validate-go-version:  ## Validates the installed version of go to allow the `go install` syntax needed for `make vendor`
+	@if [ $(GO_MAJOR_VERSION) -lt $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION) -o $(GO_MINOR_VERSION) -lt $(MINIMUM_SUPPORTED_GO_MINOR_VERSION) ]; then \
+    	echo '$(GO_VERSION_VALIDATION_ERR_MSG)'; \
+    	exit 1; \
+	fi
\ No newline at end of file
diff --git a/Readme.md b/Readme.md
index d1c3222..a0f3913 100644
--- a/Readme.md
+++ b/Readme.md
@@ -151,7 +151,7 @@ The content of this project consists of a set of jsonnet files making up a libra
 
 ### Pre-reqs
 
-The project requires json-bundler and the jsonnet compiler. The Makefile does the heavy-lifting of installing them. You need [Go](https://golang.org/dl/) already installed:
+The project requires json-bundler and the jsonnet compiler. The Makefile does the heavy-lifting of installing them. You need [Go](https://golang.org/dl/) (version 1.18 minimum) already installed:
 
 ```bash
 git clone https://github.com/carlosedp/cluster-monitoring