bash-a-mongoose.sh

#!/bin/bash -e

REGION="ap-southeast-2"

function waitForStack {

    # to avoid a race condition with AWS, wait a moment for the build to start
    sleep 4

    TIMEOUT_IN_SECONDS=600
    START=$(date +%s)
    TIMEOUT=$(($START + $TIMEOUT_IN_SECONDS))
    stackName=$1

    echo "Waiting for Stack: $stackName"
    while [[ 1 ]]; do
        # check stack exists: 
        CODE=$(echo $(aws cloudformation describe-stacks --stack-name $stackName &> /dev/null ) $?)
        if [[ $CODE -eq 255 ]]; then 
            echo "Stack Deleted."
            exit 1
        fi

        stackStatus=$(aws cloudformation describe-stacks --region $REGION --output text \
            --stack-name $stackName --query "Stacks[0].StackStatus" | sed -e 's/^"//'  -e 's/"$//')
        echo "StackStatus: $stackStatus"

        if echo $stackStatus | grep -i 'rollback'; then
            echo "stack creation failed: $stackStatus"
            echo "========================= Stack Events =============================="
            aws cloudformation describe-stack-events --stack-name $stackName | jq '.StackEvents[].ResourceStatusReason | select (. != null)' -r
            echo "====================================================================="
            exit 1
        elif echo $stackStatus | grep -i 'fail'; then
            echo "stack creation failed: $stackStatus"
            exit 1
        elif [[ "$stackStatus" == "CREATE_COMPLETE" ]]; then
            echo "stack creation completed successfully"
            break
        elif [[ "$stackStatus" == "UPDATE_COMPLETE" ]]; then
            echo "stack update completed successfully"
            break
        fi

        if [[ $(date +%s) -gt $TIMEOUT ]]; then
            echo 'Timeout exceeded. Failure to deploy stack' 
            exit 1
        fi

        # Sleep for 5 seconds, if stack creation in progress
        sleep 5
    done
}


if [[ $# -ne 1 ]]; then
    echo "A mongoose-deploy compatable cloudformation tool"
    echo ""
    echo "Usage: $0 <upsert/delete>"
    exit 1
fi


# Parse parameters
accountNumber=$(aws sts get-caller-identity --output text --query 'Account')
config=$(python -c 'import sys, yaml, json; json.dump(yaml.load(sys.stdin), sys.stdout, indent=4)' < mongoose.yaml)
stackName=$(echo $config | jq 'keys[0]' -r)
cfnParameters=$(echo $config | jq ".[\"$stackName\"].parameters | .[\"$accountNumber\"]" -r)
templatePath=$(echo $config | jq ".[\"$stackName\"] | .[\"template-path\"]" -r)

paramKeys=$(echo $cfnParameters | jq 'keys[]' -r)

parameters='--parameters '

# format the parameters in the stupid array style required by the CLI
for key in $paramKeys; do
    paramValue=$(echo $cfnParameters | jq ".$key" -r)
    parameters=$(echo "$parameters ParameterKey=$key,ParameterValue=$paramValue")
done

if [[ "$1" == "upsert" ]]; then

    if [[ "$(aws cloudformation describe-stacks --stack-name $stackName 2> /dev/null | jq '.Stacks | length')" -eq 0 ]]; then
        echo "Stack does not exist"
        echo aws cloudformation create-stack \
             --stack-name "$stackName" \
             --capabilities CAPABILITY_IAM \
             --capabilities CAPABILITY_NAMED_IAM \
             --template-body "file://$templatePath" \
             "$parameters" | bash
    else
        echo "Stack exists"
        echo aws cloudformation update-stack \
             --stack-name "$stackName" \
             --capabilities CAPABILITY_IAM \
             --capabilities CAPABILITY_NAMED_IAM \
             --template-body "file://$templatePath" \
             "$parameters" | bash # Wooo! like lisp
    fi

    waitForStack $stackName
elif [[ $1 == "delete" ]]; then

    if [[ "$(aws cloudformation describe-stacks --stack-name $stackName 2> /dev/null | jq '.Stacks | length')" -eq 0 ]]; then
        echo "Stack does not exist"
        exit 0
    else
        echo "Stack exists"
        aws cloudformation delete-stack \
             --stack-name "$stackName"
        waitForStack "$stackName"
    fi
elif [[ $1 == "show" ]]; then

    if [[ "$(aws cloudformation describe-stacks --stack-name $stackName 2> /dev/null | jq '.Stacks | length')" -eq 0 ]]; then
        echo "Stack does not exist"
        exit 0
    else
        aws cloudformation describe-stacks \
            --stack-name "$stackName"
    fi
elif [[ $1 == "outputs" ]]; then

    if [[ "$(aws cloudformation describe-stacks --stack-name $stackName 2> /dev/null | jq '.Stacks | length')" -eq 0 ]]; then
        echo "Stack does not exist"
        exit 0
    else
        aws cloudformation describe-stacks \
            --stack-name "$stackName" | jq '.Stacks[0].Outputs'
    fi
else
    echo "Options are 'upsert', 'delete', 'show' or 'outputs'"
    exit 1
fi