#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2021-10-22 15:11:27 +0100 (Fri, 22 Oct 2021)
#
#  https://github.com/HariSekhon/DevOps-Bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/HariSekhon
#

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# shellcheck disable=SC1090
. "$srcdir/lib/utils.sh"

# shellcheck disable=SC2034,SC2154
usage_description="
Builds the local docker image using the Dockerfile in the current directory and pushes it to the AWS ECR registry

Tags the docker image with the following and pushes all tags to AWS ECR:

    - latest
    - Git full hashref
    - Git branch
    - any Git tags, if found, for easy versioning support
    - date (YYYY-MM-DD)
    - datetimestamp (YYYYMMDDThhmmssZ] in UTC

Requires AWS CLI to be installed and configured, as well as Docker to be running locally
"

# used by usage() in lib/utils.sh
# shellcheck disable=SC2034
usage_args="<ecr_registry> <repo>"

help_usage "$@"

num_args 2 "$@"

ECR="$1"
REPO="$2"

if ! [[ "$ECR" =~ ^[[:digit:]]+.dkr.ecr.[[:alnum:]-]+.amazonaws.com$ ]]; then
    usage "Invalid ECR address given:  $ECR"
fi
if ! [[ "$REPO" =~ ^[[:alnum:]/-]+$ ]]; then
    usage "Invalid Repo name given:  $REPO"
fi

if is_CI; then
    docker version
    echo
fi

echo "* AWS ECR -> Docker login"
# $AWS_DEFAULT_REGION should be set in env or profile
aws ecr get-login-password | docker login --username AWS --password-stdin "$ECR"
echo

echo "* Determining tags"
hashref="$(git rev-parse HEAD)"
git_branch="$(git rev-parse --abbrev-ref HEAD)"
git_tags="$(git tag --points-at HEAD)"  # can return multiple tags
# must use date -u switch since --utc only works on Linux and not Mac
date="$(date -u '+%F')"
timestamp="$(date -u '+%FT%H%M%SZ')"

# adding tags:
#
tags="
$git_branch
$git_tags
$date
$timestamp
"
echo

export DOCKER_BUILDKIT=1

# shellcheck disable=SC2046
docker build -t "$ECR/$REPO:$hashref" . \
             --build-arg BUILDKIT_INLINE_CACHE=1 \
             --cache-from "$ECR/$REPO:latest" \
             --cache-from "$ECR/$REPO:$hashref" \
             $(for tag in $tags; do echo -n " --cache-from $ECR/$REPO:$tag"; done)
echo

for tag in latest $tags; do
    echo "* Tagging as '$tag'"
    docker tag "$ECR/$REPO:$hashref" "$ECR/$REPO:$tag"
    echo
done

# pushing latest last intentionally for a more atomic update
for tag in "$hashref" $tags latest; do
    echo "* Pushing tag '$tag'"
    docker push "$ECR/$REPO:$tag"
    echo
done