docker.sh

#!/usr/bin/env bash
set -e
ARCH=$(uname -m)
GIT_COMMIT=$(git rev-parse HEAD)
GIT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
IMAGE_NAME=rustvmm/dev
REGISTRY=index.docker.io

# Get the latest published version. Returns a number.
# If latest is v100, returns 100.
# If latest for riscv64 is v100-riscv, returns 100.
# This works as long as we have less than 100 tags because we set the page size to 100,
# once we have more than that this script needs to be updated.
latest(){
  curl -L -s 'https://registry.hub.docker.com/v2/repositories/rustvmm/dev/tags?page_size=100'| \
    jq '."results"[]["name"]' |  sed 's/"//g' | cut -c 2- | grep -E "^[0-9]+" | sort -n | tail -1
}

next_version() {
    latest_version=$(latest)
    new_version=$((latest_version + 1))
    echo "$new_version"
}

print_next_version() {
  echo "rustvmm/dev:v$(next_version)"
}

print_registry() {
  echo ${REGISTRY}
}

print_image_name() {
  echo ${IMAGE_NAME}
}

# Builds the tag for the newest versions. It needs the last published version number.
# Returns a valid docker tag.
build_tag(){
  new_version=$(next_version)
  new_tag=${IMAGE_NAME}:v${new_version}_$ARCH
  echo "$new_tag"
}

# Build a new docker version.
# It will build a new docker image with tag latest version + 1
# and will alias it with "latest" tag.
build(){
  new_tag=$(build_tag)
  docker build -t "$new_tag" \
        --build-arg GIT_BRANCH="${GIT_BRANCH}" \
        --build-arg GIT_COMMIT="${GIT_COMMIT}" \
        -f Dockerfile .
  echo "Build completed for $new_tag"
}

# Creates and pushes a manifest for a new version
manifest(){
  latest_version=$(latest)
  new_version=$((latest_version + 1))
  new_tag=${IMAGE_NAME}:v${new_version}
  docker manifest create \
        $new_tag \
        "${new_tag}_x86_64" \
        "${new_tag}_aarch64"
  echo "Manifest successfully created"
  docker manifest push $new_tag
  echo "Manifest successfully pushed on DockerHub: ${DOCKERHUB_LINK}"
}

publish(){
    new_tag=$(build_tag)
    echo "Publishing $new_tag on dockerhub"
  	docker push "$new_tag"
  	echo "Successfully published $new_tag on DockerHub: ${DOCKERHUB_LINK}"
}

case $1 in
  "build")
    build;
    ;;
  "publish")
    publish;
    ;;
  "manifest")
    manifest;
    ;;
  "print-registry")
    print_registry;
    ;;
  "print-image-name")
    print_image_name;
    ;;
  "print-next-version")
    print_next_version;
    ;;
  *)
   echo "Command $1 not supported. Try with 'publish', 'build', 'manifest' or 'print-next-version'. ";
   ;;
esac