#!/bin/bash
# Builds the Dockerfile[.variant] and injects tgz'ed Netbox code from Github

echo "▶️ $0 $*"

set -e

if [ "${1}x" == "x" ] || [ "${1}" == "--help" ] || [ "${1}" == "-h" ]; then
  echo "Usage: ${0} <branch> [--push|--push-only]"
  echo "  branch       The branch or tag to build. Required."
  echo "  --push       Pushes built the Docker image to the registry."
  echo "  --push-only  Does not build. Only pushes the Docker image to the registry."
  echo ""
  echo "You can use the following ENV variables to customize the build:"
  echo "  DEBUG    If defined, the script does not stop when certain checks are unsatisfied."
  echo "  DRY_RUN  Prints all build statements instead of running them."
  echo "  DOCKER_OPTS Add parameters to Docker."
  echo "           Default:"
  echo "             When <TAG> starts with 'v':  \"\""
  echo "             Else:                        \"--no-cache\""
  echo "  BRANCH   The branch to build."
  echo "           Also used for tagging the image."
  echo "  TAG      The version part of the docker tag."
  echo "           Default:"
  echo "             When <BRANCH>=master:  latest"
  echo "             When <BRANCH>=develop: snapshot"
  echo "             Else:          same as <BRANCH>"
  echo "  DOCKER_ORG The Docker registry (i.e. hub.docker.com/r/<DOCKER_ORG>/<DOCKER_REPO>) "
  echo "           Also used for tagging the image."
  echo "           Default: ninech"
  echo "  DOCKER_REPO The Docker registry (i.e. hub.docker.com/r/<DOCKER_ORG>/<DOCKER_REPO>) "
  echo "           Also used for tagging the image."
  echo "           Default: netbox"
  echo "  DOCKER_TAG The name of the tag which is applied to the image."
  echo "           Useful for pushing into another registry than hub.docker.com."
  echo "           Default: <DOCKER_ORG>/<DOCKER_REPO>:<BRANCH>"
  echo "  SRC_ORG  Which fork of netbox to use (i.e. github.com/<SRC_ORG>/<SRC_REPO>)."
  echo "           Default: digitalocean"
  echo "  SRC_REPO The name of the netbox for to use (i.e. github.com/<SRC_ORG>/<SRC_REPO>)."
  echo "           Default: netbox"
  echo "  URL      Where to fetch the package from."
  echo "           Must be a tar.gz file of the source code."
  echo "           Default: https://github.com/<SRC_ORG>/<SRC_REPO>/archive/\$BRANCH.tar.gz"
  echo "  VARIANT  The variant to build."
  echo "           The value will be used as a suffix to the \$TAG and for the Dockerfile"
  echo "           selection. The TAG being build must exist for the base variant and"
  echo "           corresponding Dockerfile must start with the following lines:"
  echo "             ARG DOCKER_ORG=ninech"
  echo "             ARG DOCKER_REPO=netbox"
  echo "             ARG FROM_TAG=latest"
  echo "             FROM \$DOCKER_ORG/\$DOCKER_REPO:\$FROM_TAG"
  echo "           Example: VARIANT=ldap will result in the tag 'latest-ldap' and the"
  echo "           Dockerfile './Dockerfile.ldap' being used."
  echo "           Exception: VARIANT=main will use the './Dockerfile' Dockerfile"
  echo "           Default: main"
  echo "  HTTP_PROXY The proxy to use for http requests."
  echo "           Example: http://proxy.domain.tld:3128"
  echo "           Default: empty"
  echo "  HTTPS_PROXY The proxy to use for https requests."
  echo "           Example: http://proxy.domain.tld:3128"
  echo "           Default: empty"
  echo "  FTP_PROXY The proxy to use for ftp requests."
  echo "           Example: http://proxy.domain.tld:3128"
  echo "           Default: empty"
  echo "  NO_PROXY Comma-separated list of domain extensions proxy should not be used for."
  echo "           Example: .domain1.tld,.domain2.tld"
  echo "           Default: empty"

  if [ "${1}x" == "x" ]; then
    exit 1
  else
    exit 0
  fi
fi

# read the project version and trim it
# see https://stackoverflow.com/a/3232433/172132
NETBOX_DOCKER_PROJECT_VERSION="${NETBOX_DOCKER_PROJECT_VERSION-$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' VERSION)}"

# variables for fetching the source
SRC_ORG="${SRC_ORG-digitalocean}"
SRC_REPO="${SRC_REPO-netbox}"
BRANCH="${1}"
URL="${URL-https://github.com/${SRC_ORG}/${SRC_REPO}/archive/$BRANCH.tar.gz}"

# variables for tagging the docker image
DOCKER_ORG="${DOCKER_ORG-ninech}"
DOCKER_REPO="${DOCKER_REPO-netbox}"
case "${BRANCH}" in
  master)
    TAG="${TAG-latest}";;
  develop)
    TAG="${TAG-snapshot}";;
  *)
    TAG="${TAG-$BRANCH}";;
esac
DOCKER_TAG="${DOCKER_TAG-${DOCKER_ORG}/${DOCKER_REPO}:${TAG}}"

# Checking which VARIANT to build
if [ "$VARIANT" == "main" ]; then
  DOCKERFILE="Dockerfile"
else
  DOCKERFILE="Dockerfile.${VARIANT}"
  DOCKER_TAG="${DOCKER_TAG}-${VARIANT}"

  # Fail fast
  if [ ! -f "${DOCKERFILE}" ]; then
    echo "🚨 The Dockerfile ${DOCKERFILE} for variant '${VARIANT}' doesn't exist."

    if [ -z "$DEBUG" ]; then
      exit 1
    else
      echo "⚠️ Would exit here with code '1', but DEBUG is enabled."
    fi
  fi
fi

DOCKER_OPTS=("${DOCKER_OPTS[@]}")

# caching is only ok for version tags
case "${TAG}" in
 v*) ;;
 *)  DOCKER_OPTS+=( "--no-cache" ) ;;
esac

DOCKER_OPTS+=( "--pull" )

# Build args
DOCKER_BUILD_ARGS=(
  --build-arg "NETBOX_DOCKER_PROJECT_VERSION=${NETBOX_DOCKER_PROJECT_VERSION}"
  --build-arg "FROM_TAG=${TAG}"
  --build-arg "BRANCH=${BRANCH}"
  --build-arg "URL=${URL}"
  --build-arg "DOCKER_ORG=${DOCKER_ORG}"
  --build-arg "DOCKER_REPO=${DOCKER_REPO}"
)
if [ -n "$HTTP_PROXY" ]; then
  DOCKER_BUILD_ARGS+=( --build-arg "http_proxy=${HTTP_PROXY}" )
fi
if [ -n "$HTTPS_PROXY" ]; then
  DOCKER_BUILD_ARGS+=( --build-arg "https_proxy=${HTTPS_PROXY}" )
fi
if [ -n "$FTP_PROXY" ]; then
  DOCKER_BUILD_ARGS+=( --build-arg "ftp_proxy=${FTP_PROXY}" )
fi
if [ -n "$NO_PROXY" ]; then
  DOCKER_BUILD_ARGS+=( --build-arg "no_proxy=${NO_PROXY}" )
fi

if [ -z "$DRY_RUN" ]; then
  DOCKER_CMD="docker"
else
  echo "⚠️ DRY_RUN MODE ON ⚠️"
  DOCKER_CMD="echo docker"
fi

if [ "${2}" != "--push-only" ] ; then
  echo "🐳 Building the Docker image '${DOCKER_TAG}' from the url '${URL}'."
  $DOCKER_CMD build -t "${DOCKER_TAG}" "${DOCKER_BUILD_ARGS[@]}" "${DOCKER_OPTS[@]}" -f "${DOCKERFILE}" .
  echo "✅ Finished building the Docker images '${DOCKER_TAG}'"
fi

if [ "${2}" == "--push" ] || [ "${2}" == "--push-only" ] ; then
  echo "⏫ Pushing '${DOCKER_TAG}"
  $DOCKER_CMD push "${DOCKER_TAG}"
  echo "✅ Finished pushing the Docker image '${DOCKER_TAG}'."
fi