entrypoint.sh

#!/bin/bash -
#title          :entrypoint.sh
#description    :This script build image with multiple option and push the image to Google Container Registry.
#author         :RafikFarhad<rafikfarhad@gmail.com>
#date           :20200703
#version        :2.0.1
#usage          :./entrypoint.sh
#notes          :Required env values are: INPUT_GCLOUD_SERVICE_KEY,INPUT_REGISTRY,INPUT_PROJECT_ID,INPUT_IMAGE_NAME
#                Optional env values are: INPUT_IMAGE_TAG,INPUT_DOCKERFILE,INPUT_TARGET,INPUT_CONTEXT,INPUT_BUILD_ARGS
#bash_version   :5.0.17(1)-release
###################################################

function split_csv() {
    IFS=','
    csv_data=$1
    local -n global_list_array=$2
    for i in $csv_data; do
        global_list_array+=($i)
    done
    unset IFS
}

ALL_IMAGE_TAG=()

echo "Authenticating docker to gcloud ..."
if ! echo $INPUT_GCLOUD_SERVICE_KEY | python -m base64 -d >/tmp/key.json 2>/dev/null; then
    echo "Failed to decode gcloud_service_key -- did you forget to encode it using 'python -m base64 -e < yourkey.json'?"
    exit 1
fi

if cat /tmp/key.json | docker login -u _json_key --password-stdin https://$INPUT_REGISTRY; then
    echo "Logged in to google cloud ..."
else
    echo "Docker login failed. Exiting ..."
    exit 1
fi

split_csv $INPUT_IMAGE_TAG ALL_IMAGE_TAG


TEMP_IMAGE_NAME="$INPUT_IMAGE_NAME:temporary"

echo "Building image ..."

[ -z $INPUT_TARGET ] && TARGET_ARG="" || TARGET_ARG="--target $INPUT_TARGET"

[ -z $INPUT_DOCKERFILE ] && FILE_ARG="" || FILE_ARG="--file $INPUT_DOCKERFILE"


if [ ! -z "$INPUT_BUILD_ARGS" ]; then
  for ARG in $(echo "$INPUT_BUILD_ARGS" | tr ',' '\n'); do
    BUILD_PARAMS="$BUILD_PARAMS --build-arg ${ARG}"
  done
fi

echo "docker build $BUILD_PARAMS $TARGET_ARG -t $TEMP_IMAGE_NAME $FILE_ARG $INPUT_CONTEXT"


if docker build $BUILD_PARAMS $TARGET_ARG -t $TEMP_IMAGE_NAME $FILE_ARG $INPUT_CONTEXT; then
    echo "Image built ..."
else
    echo "Image building failed. Exiting ..."
    exit 1
fi

for IMAGE_TAG in ${ALL_IMAGE_TAG[@]}; do

    IMAGE_NAME="$INPUT_REGISTRY/$INPUT_PROJECT_ID/$INPUT_IMAGE_NAME:$IMAGE_TAG"

    echo "Fully qualified image name: $IMAGE_NAME"

    echo "Creating docker tag ..."

    docker tag $TEMP_IMAGE_NAME $IMAGE_NAME

    echo "Pushing image $IMAGE_NAME ..."

    if ! docker push $IMAGE_NAME; then
        echo "Pushing failed. Exiting ..."
        exit 1
    else
        echo "Image pushed."
    fi
done

echo "Process complete."