#!/usr/bin/env bash

GO_CMD=${GO_CMD:-go}

GO_VERSION_MIN=$1
echo "==> Checking that build is using go version >= $1..."

if $GO_CMD version | grep -q devel;
then
	GO_VERSION="devel"
else
	GO_VERSION=$($GO_CMD version | grep -o 'go[0-9]\+\.[0-9]\+\(\.[0-9]\+\)\?' | tr -d 'go')

	IFS="." read -r -a GO_VERSION_ARR <<< "$GO_VERSION"
	IFS="." read -r -a GO_VERSION_REQ <<< "$GO_VERSION_MIN"

	if [[ ${GO_VERSION_ARR[0]} -lt ${GO_VERSION_REQ[0]} ||
		( ${GO_VERSION_ARR[0]} -eq ${GO_VERSION_REQ[0]} &&
		( ${GO_VERSION_ARR[1]} -lt ${GO_VERSION_REQ[1]} ||
		( ${GO_VERSION_ARR[1]} -eq ${GO_VERSION_REQ[1]} && ${GO_VERSION_ARR[2]} -lt ${GO_VERSION_REQ[2]} )))
	]]; then
		echo "Vault requires go $GO_VERSION_MIN to build; found $GO_VERSION."
		exit 1
	fi
fi

echo "==> Using go version $GO_VERSION..."