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# Build and push a Docker image with CI/CD.
# Docker-in-Docker documentation: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html
#
# By default builds are tagged with their branch name and pushed to the
# Gitlab Docker Registry. If DOCKER_TAG_LATEST is set to true, builds on
# the $DOCKER_LATEST_BRANCH are also tagged and pushed as ":latest"
#
# Scheduled builds can be enabled on a Gitlab schedule by specifying
# DOCKER_SCHEDULE = "true" in variables
---
variables:
# Docker registry where images will be pushed
DOCKER_REGISTRY: "$CI_REGISTRY"
DOCKER_USERNAME: "$CI_REGISTRY_USER"
DOCKER_TOKEN: "$CI_REGISTRY_PASSWORD"
# Whether or to push images after they're built
DOCKER_PUSH: "true"
# TODO: Conditionally include '--file' to docker build to reduce need
# to always define FILEPATH when BUILDCONTEXT is set
DOCKER_FILEPATH: "Dockerfile"
DOCKER_BUILDCONTEXT: "."
DOCKER_IMAGE: "$CI_REGISTRY_IMAGE"
# If LATEST_TAG is set to true, builds on the $DOCKER_LATEST_BRANCH
# will be tagged and pushed with ":latest"
DOCKER_LATEST_TAG: "true"
DOCKER_LATEST_BRANCH: "$CI_DEFAULT_BRANCH"
.docker-build-and-push: &docker-build-and-push
image: docker:latest
stage: deploy
interruptible: true
services:
- docker:dind
before_script:
- docker login -u "$DOCKER_USERNAME" -p "$DOCKER_TOKEN" $DOCKER_REGISTRY
script:
# Warm the cache by fetching the latest image. There's no guarantee
# the image will already exist on the runner.
- docker pull "$DOCKER_IMAGE:${CI_COMMIT_REF_SLUG}" || true
- >
docker build
--pull
--cache-from "$DOCKER_IMAGE:${CI_COMMIT_REF_SLUG}"
--file "$DOCKER_FILEPATH"
--tag "$DOCKER_IMAGE:${CI_COMMIT_REF_SLUG}"
$DOCKER_BUILDCONTEXT
- |
if [[ "$CI_COMMIT_BRANCH" == "$DOCKER_LATEST_BRANCH" && "$DOCKER_LATEST_TAG" == "true" ]]; then
docker tag "$DOCKER_IMAGE:${CI_COMMIT_REF_SLUG}" "$DOCKER_IMAGE"
fi
- |
# Push docker images if DOCKER_PUSH is set
if [[ "$DOCKER_PUSH" == "true" ]]; then
docker push "$DOCKER_IMAGE:${CI_COMMIT_REF_SLUG}"
# Push ':latest' if LATEST_TAG is true
if [[ "$CI_COMMIT_BRANCH" == "$DOCKER_LATEST_BRANCH" && "$DOCKER_LATEST_TAG" == "true" ]]; then
docker push "$DOCKER_IMAGE"
fi
fi
rules:
- if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
when: never
# Gitlab does not have a way of specifying which jobs are scheduled,
# so an extra variable is needed in order to signify docker build
# should be picked up by the schedule run.
- if: $CI_PIPELINE_SOURCE == "schedule" && $DOCKER_SCHEDULE != "true"
when: never
- if: '$CI_COMMIT_BRANCH == $DOCKER_LATEST_BRANCH'
- if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
- if: $CI_COMMIT_TAG
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