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# This is a GitLab CI configuration to build the project as a docker image
# The file is generic enough to be dropped in a project containing a working Dockerfile
# Author: Florent CHAUVEAU <florent.chauveau@gmail.com>
# Mentioned here: https://blog.callr.tech/building-docker-images-with-gitlab-ci-best-practices/
# do not use "latest" here, if you want this to work in the future
#image: docker:18
image: registry.gitlab.com/kraxel/podman-docker-builder:latest
stages:
- build
- push
# Use this if your GitLab runner does not use socket binding
#services:
# - docker:dind
before_script:
# docker login asks for the password to be passed through stdin for security
# we use $CI_JOB_TOKEN here which is a special token provided by GitLab
- echo -n $CI_JOB_TOKEN | docker login -u gitlab-ci-token --password-stdin $CI_REGISTRY
Build:
stage: build
script:
# fetches the latest image (not failing if image is not found)
- docker pull $CI_REGISTRY_IMAGE:latest || true
# builds the project, passing proxy variables, and vcs vars for LABEL
# notice the cache-from, which is going to use the image we just pulled locally
# the built image is tagged locally with the commit SHA, and then pushed to
# the GitLab registry
- >
docker build
--pull
--build-arg VCS_REF=$CI_COMMIT_SHA
--build-arg VCS_URL=$CI_PROJECT_URL
--cache-from $CI_REGISTRY_IMAGE:latest
--tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
.
- docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
# Here, the goal is to tag the "master" branch as "latest"
Push latest:
variables:
# We are just playing with Docker here.
# We do not need GitLab to clone the source code.
GIT_STRATEGY: none
stage: push
only:
# Only "master" should be tagged "latest"
- master
script:
# Because we have no guarantee that this job will be picked up by the same runner
# that built the image in the previous step, we pull it again locally
- docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
# Then we tag it "latest"
- docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:latest
# Annnd we push it.
- docker push $CI_REGISTRY_IMAGE:latest
# Finally, the goal here is to Docker tag any Git tag
# GitLab will start a new pipeline everytime a Git tag is created, which is pretty awesome
Push tag:
variables:
# Again, we do not need the source code here. Just playing with Docker.
GIT_STRATEGY: none
stage: push
only:
# We want this job to be run on tags only.
- tags
script:
- docker pull $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA
- docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
- docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
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