From b611b4b5aa9b0356a0e6e3989488f499c81a7bee Mon Sep 17 00:00:00 2001
From: Quentin Manfroi <quentin.manfroi@fr.clara.net>
Date: Thu, 1 Aug 2019 13:17:22 +0200
Subject: [PATCH] MON-486 add requirements check script

---
 README.md                  |  4 ++--
 scripts/00_requirements.sh | 48 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100755 scripts/00_requirements.sh

diff --git a/README.md b/README.md
index 3a2515e..a53577c 100644
--- a/README.md
+++ b/README.md
@@ -31,11 +31,11 @@ After any change on this repo, you need to run the `./scripts/auto_update.sh ./`
 
 ### Terraform ###
 
-Version >= 0.12 is required to use these modules of monitors.
+Here is the minimum version required to use these modules of integrations.
 
 ```
 terraform {
-  required_version = "~> 0.12"
+  required_version = ">= 0.12.6"
 }
 
 ```
diff --git a/scripts/00_requirements.sh b/scripts/00_requirements.sh
new file mode 100755
index 0000000..9889c2d
--- /dev/null
+++ b/scripts/00_requirements.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+set -u
+
+source "$(dirname $0)/utils.sh"
+goto_root
+
+function check_command() {
+    local cmd="$1"
+    if ! command -v ${cmd} > /dev/null 2>&1; then
+        echo "This requires ${cmd} command, please install it first."
+        exit 1
+    fi
+}
+
+function verlte() {
+    [  "$1" = "$(echo -e "$1\n$2" | sort -V | head -n1)" ]
+}
+
+function verlt() {
+    [ "$1" = "$2" ] && return 1 || verlte $1 $2
+}
+
+function check_version() {
+    if [[ "$1" == "terraform" ]]; then
+        tmp_dir=$(mktemp -d)
+        cd ${tmp_dir}
+        cur_ver=$(terraform version | head -n 1 | cut -d' ' -f2)
+        cur_ver=${cur_ver#"v"}
+        cd - > /dev/null
+        rm -fr ${tmp_dir}
+        req_ver=$(grep required_version README.md | awk '{print $4}')
+        req_ver=${req_ver%'"'}
+    elif [[ "$1" == "terraform-docs" ]]; then
+        req_ver="0.6.0"
+        cur_ver=$(terraform-docs --version)
+    else
+        return
+    fi
+    if ! verlte $req_ver $cur_ver; then
+        echo "This requires at least version ${req_ver} of $1, please upgrade (current version is ${cur_ver})"
+        exit 2
+    fi
+}
+
+for cmd in terraform terraform-docs; do
+    check_command $cmd
+    check_version $cmd
+done