version management checks for terraform environments

check-env.sh

#!/bin/bash

# Script assumes a recent enough version of bash  (=~ perfomrs REGEX matching)

[[ "${DEBUG}" ]] && { env|sort ; set -x ; }

if [[ -z ${TF_MIN_VERSION_REGEX} ]] ; then
    echo minimum version check for terraform binary is NOT enforced.
    exit 0
fi

function get_tf_version () {
    local _TF_VERSION=$(${TF} version | grep ^Terraform | cut -f2 -dv)
    [[ "${DEBUG}" ]] && echo tf version found: ${_TF_VERSION} >>/dev/stderr
    echo ${_TF_VERSION}
}

function main () {
    # if auto_switch is true, always unlink and link:
    if [[ -n "${TF_VERSION_AUTO_SWITCH}" &&
           ! ${INSTALLED_TF_VERSION} =~ ${TF_MIN_VERSION_REGEX} ]] ; then
        brew switch terraform ${TF_VERSION_DESIRED} >/dev/null &&
            echo installed version of terraform was switched to ${TF_VERSION_DESIRED}
    else
        # Assume OSX for now:
        # warn if switch needed
        [[ ${INSTALLED_TF_VERSION} =~ ${TF_MIN_VERSION_REGEX} ]] ||
            {
                echo "This repo requires a different version of terraform be installed."
                echo ;
                echo "     use: 'brew switch terraform <version>'" ;
                echo ; 
                echo "to switch the installed version of terraform to one that" ;
                echo "matches the per-environment defined string check" ;
                echo "regex: ${TF_MIN_VERSION_REGEX}" ;
                echo ;
                echo "your current version of terraform appears to be ${INSTALLED_TF_VERSION}" ;
                exit 1 ;
            }
        exit 0
    fi
}

# init variables
INSTALLED_TF_VERSION=$(get_tf_version)
    
main
Raw

ENV-slash-Makefile.diff

@@ -10,6 +10,7 @@ TF_ROOT := $(shell dirname $$(dirname $(realpath $(lastword $(MAKEFILE_LIST)))))
 TF := $(TF_ROOT)/terraform.sh

 # This file declares our useful Makefile targets:
+include ./variables.makefile
 include ../lib/check.makefile
 include ../lib/environment-toplevel-Makefile

lib-slash-check.makefile

.

one-of-many-checks:
  # Check that our terraform script is being used:
	@$(TF) check >/dev/null || { echo "terraform helper script missing" ; exit 1 ; }
	@if $$(type ./check-env.sh 2>/dev/null >/dev/null) ; then \
             [[ "${DEBUG}" ]] && echo executing ./check-env.sh ; \
             TF=$(TF) ./check-env.sh ; \
         elif $$(type ../check-env.sh 2>/dev/null >/dev/null) ; then \
             [[ "${DEBUG}" ]] && echo executing ../check-env.sh ; \
             TF=$(TF) ../check-env.sh ; \
         elif $$(type ../../check-env.sh 2>/dev/null >/dev/null) ; then \
             [[ "${DEBUG}" ]] && echo executing ../../check-env.sh ; \
             TF=$(TF) ../../check-env.sh ; \
         else \
             echo unable to find check-env in . .. or ../.. ; \
             exit 1 ; \
         fi
         
 ...

variables.makefile

export TF_MIN_VERSION_REGEX := ^0.6
export TF_VERSION_AUTO_SWITCH := true
export TF_VERSION_DESIRED := 0.6.16