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#!/bin/bash
#
# Build script for the gitlab ci.
#
# usage: build.sh DIR [TAG]
#
# Will run docker build in DIR with DIR/Dockerfile or
# DIR/TAG.dockerfile if TAG is given.
#
# Assumes CI specific environment variables to be set:
# CI_REGISTRY_IMAGE
# LAST_COMMIT (fetched from the gitlab api in before_script hook)
#

DIR=$1
TAG=${2:-latest}
DOCKERFILE=docker/${DIR}/${2:-Dockerfile}${2:+.dockerfile}
TARGET=${CI_REGISTRY_IMAGE}/${DIR}:${TAG}

if git diff "$LAST_COMMIT" HEAD --name-only | egrep "($DOCKERFILE|^.gitlab)"; then
  docker login -u gitlab-ci-token -p "$CI_JOB_TOKEN" "$CI_REGISTRY"
  docker build -t "$TARGET" -f "$DOCKERFILE" docker/
  docker push "$TARGET"
fi