#!/bin/bash

set -e

# We need to parse $IMAGE_NAME because $CACHE_TAG is broken on Docker Hub post_push

IFS=: read DOCKER_REPO CACHE_TAG <<< $IMAGE_NAME

echo "repo=${DOCKER_REPO}"
echo "tag=${CACHE_TAG}"

SEMVER_REGEX="^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$"

if ! [[ "$CACHE_TAG" =~ $SEMVER_REGEX ]]; then
  echo Not a semver tag - skipping
  exit
fi

major=${BASH_REMATCH[1]}
minor=${BASH_REMATCH[2]}

# Tag and push image for each additional tag
for tag in {"$major","${major}.${minor}","latest"}; do
  echo "Tagging ${DOCKER_REPO}:${tag}"
  docker tag $IMAGE_NAME ${DOCKER_REPO}:${tag}
  docker push ${DOCKER_REPO}:${tag}
done