fixup! fix: match the golang version in go.mod

Signed-off-by: Harikrishnan Balagopal <harikrishmenon@gmail.com>

Makefile

@@ -12,7 +12,7 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
-GO_VERSION  ?= 1.16
+GO_VERSION  ?= $(shell go run ./scripts/detectgoversion/detect.go 2>/dev/null || printf '1.16')
 BINNAME     ?= move2kube
 PLUGIN_BINNAME ?= kubectl-translate
 BINDIR      := $(CURDIR)/bin

go.mod

@@ -37,6 +37,7 @@ require (
 	github.com/xrash/smetrics v0.0.0-20200730060457-89a2a8a1fb0b
 	go.starlark.net v0.0.0-20210223155950-e043a3d3c984
 	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2
+	golang.org/x/mod v0.3.0
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 	k8s.io/api v0.19.4

scripts/detectgoversion/detect.go

@@ -0,0 +1,46 @@
+// +build !excludedist
+
+/*
+Copyright IBM Corporation 2020
+
+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.
+*/
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"golang.org/x/mod/modfile"
+)
+
+func main() {
+	modFilePath := "go.mod"
+	if len(os.Args) == 2 && os.Args[1] != "" {
+		modFilePath = os.Args[1]
+	}
+	data, err := ioutil.ReadFile(modFilePath)
+	if err != nil {
+		panic(err)
+	}
+	modFile, err := modfile.Parse(modFilePath, data, nil)
+	if err != nil {
+		panic(err)
+	}
+	if modFile.Go == nil {
+		panic(fmt.Sprintf("didn't find the go version in the go.mod file at path %s", modFilePath))
+	}
+	fmt.Print(modFile.Go.Version)
+}