push-docker-images

#!/bin/bash
set -euo pipefail

SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"

REPO_ROOT_PATH=$SCRIPTPATH/../
MAKE_FILE_PATH=$REPO_ROOT_PATH/Makefile

VERSION=$(make -s -f $MAKE_FILE_PATH version)
PLATFORMS=("linux/amd64")
MANIFEST_IMAGES=""
MANIFEST=""
DOCKER_CLI_CONFIG="${HOME}/.docker/config.json"

USAGE=$(cat << 'EOM'
  Usage: push-docker-images  [-p <platform pairs>]
  Pushes docker images for the platform pairs passed in w/ a dockerhub manifest

  Example: push-docker-images -p "linux/amd64,linux/arm"
          Optional:
            -p          Platform pair list (os/architecture) [DEFAULT: linux/amd64]
            -r          IMAGE REPO: set the docker image repo
            -v          VERSION: The application version of the docker image [DEFAULT: output of `make version`]
            -m          Create a docker manifest
EOM
)

# Process our input arguments
while getopts "mp:r:v:" opt; do
  case ${opt} in
    p ) # Platform Pairs
        IFS=',' read -ra PLATFORMS <<< "$OPTARG"
      ;;
    r ) # Image Repo
        IMAGE_REPO="$OPTARG"
      ;;
    v ) # Image Version
        VERSION="$OPTARG"
      ;;
    m ) # Docker manifest
        MANIFEST="true"
      ;;
    \? )
        echo "$USAGE" 1>&2
        exit
      ;;
  esac
done

if [[ ${#PLATFORMS[@]} -gt 1 && $MANIFEST != "true" ]]; then 
    echo "Only one platform can be pushed if you do not create a manifest."
    echo "Try again with the -m option"
    exit 1
fi

for os_arch in "${PLATFORMS[@]}"; do
    os=$(echo $os_arch | cut -d'/' -f1)
    arch=$(echo $os_arch | cut -d'/' -f2)

    img_tag_w_platform="$IMAGE_REPO:$VERSION-$os-$arch"

    if [[ $MANIFEST == "true" ]]; then
        img_tag=$img_tag_w_platform
    else 
        img_tag="$IMAGE_REPO:$VERSION"
        docker tag $img_tag_w_platform $img_tag
    fi

    docker push $img_tag
    MANIFEST_IMAGES="$MANIFEST_IMAGES $img_tag"
done

if [[ $MANIFEST == "true" ]]; then
    if [[ ! -f $DOCKER_CLI_CONFIG ]]; then 
      echo '{"experimental":"enabled"}' > $DOCKER_CLI_CONFIG
      echo "Created docker config file"
    fi
    cat <<< $(jq '.+{"experimental":"enabled"}' $DOCKER_CLI_CONFIG) > $DOCKER_CLI_CONFIG
    echo "Enabled experimental CLI features to create the docker manifest"
    docker manifest create $IMAGE_REPO:$VERSION $MANIFEST_IMAGES

    for os_arch in "${PLATFORMS[@]}"; do
        os=$(echo $os_arch | cut -d'/' -f1)
        arch=$(echo $os_arch | cut -d'/' -f2)

        img_tag="$IMAGE_REPO:$VERSION-$os-$arch"

        docker manifest annotate $IMAGE_REPO:$VERSION $img_tag --arch $arch --os $os
    done

    docker manifest push $IMAGE_REPO:$VERSION
fi