manage

#!/bin/bash

exitcode=0
curdir=$(pwd)
curpath=$(dirname $0)
terraform_bin='.tfbin'

[ -f $(dirname $0)/params ] && source $(dirname $0)/params

die () {
    echo; echo -e "ERROR: $1"; echo; cd $curdir; exit 1
}

usage () {
    echo
    echo "Usage: $(basename $0) <command>"
    cat <<-EOT

Commands:

    plan	check what should be deployed
    deploy	create AWS resources or deploy changes
    destroy	destroy AWS resources totally (be carefull, no roll back)

EOT
}

check_params () {
    param_list=(region aws_access_key_id aws_secret_access_key terraform_ver)
    local errors=0
    for i in "${param_list[@]}"; do
        if [ -z "${!i}" ]; then echo "Please set parametr \"$i\" in params file"; errors=1; fi
    done
    if [ $errors -ne 0 ]; then die "Check your params file"; fi
    export AWS_ACCESS_KEY_ID=$aws_access_key_id
    export AWS_SECRET_ACCESS_KEY=$aws_secret_access_key
}

check_utils () {
    [ $(uname) != 'Linux' ] && die "Sorry, you must use Linux to run this srcipt"
    [ -z $(which zip) ]   && die "Zip not found! Please install it by \033[1;37msudo apt-get install zip\033[0m"

    if [ ! -f $curpath/$terraform_bin/terraform ]; then
        echo 'Install terraform locally'
        mkdir -p $curpath/$terraform_bin
        curl -sSL https://releases.hashicorp.com/terraform/${terraform_ver}/terraform_${terraform_ver}_linux_amd64.zip -o $curpath/$terraform_bin/tf.zip
        unzip -qq $curpath/$terraform_bin/tf.zip -d $curpath/$terraform_bin
        rm -f $curpath/$terraform_bin/tf.zip
    fi

    local tf_cur_ver
    tf_cur_ver=`$curpath/$terraform_bin/terraform version | grep -o 'Terraform v\([0-9]*\.\)\{2\}[0-9]*' | grep -o '\([0-9]*\.\)\{2\}[0-9]*'`

    if [ "$tf_cur_ver" != "$terraform_ver" ]; then
        echo 'Update terraform locally'
        curl -sSL https://releases.hashicorp.com/terraform/${terraform_ver}/terraform_${terraform_ver}_linux_amd64.zip -o $curpath/$terraform_bin/tf.zip
        unzip -qq -o $curpath/$terraform_bin/tf.zip -d $curpath/$terraform_bin
        rm -f $curpath/$terraform_bin/tf.zip
    fi
}

# Plan resources
#
plan () {
    cd $curpath/config/
    $(pwd)/../$terraform_bin/terraform get || exitcode=$?
    $(pwd)/../$terraform_bin/terraform plan \
        -var region=$region \
        || exitcode=$?
    if [ $exitcode -ne 0 ]; then die "terraform got error while plan resources"; fi
    cd $curdir
}

# Deploy resources
#
deploy () {
    cd $curpath/config/
    $(pwd)/../$terraform_bin/terraform get || exitcode=$?
    $(pwd)/../$terraform_bin/terraform apply \
        -var region=$region \
        || exitcode=$?
    if [ $exitcode -ne 0 ]; then die "terraform got error while deploy resources"; fi
    cd $curdir
}

# Destroy resources
#
destroy () {
    cd $curpath/config/
    $(pwd)/../$terraform_bin/terraform get || exitcode=$?
    $(pwd)/../$terraform_bin/terraform destroy -force \
        -var region=$region \
        || exitcode=$?
    if [ $exitcode -ne 0 ]; then die "terraform got error while destroy resources"; fi
    cd $curdir
}

initiate () {
    echo 'Ckeck params'; check_params
    echo 'Check utils installed'; check_utils
}

# Main
#
case "$1" in
    plan)
        initiate
        plan
        ;;
    deploy)
        initiate
        deploy
        ;;
    destroy)
        initiate
        destroy
        ;;
    *)
        usage
        ;;
esac