Kaniko: Feature Request - Extracting build artifacts

[rcollette]

Prior to using Kaniko, I was doing builds on a Gitlab Shell Executor on a dedicated VM. In that mode I was able to extract build artifacts from a "build and test" target prior to generating the final "application" target.

docker build \
  -t ${DOCKER_TAG_NAME}:${VERSION} \
  -t ${DOCKER_TAG_NAME}:latest \
  --build-arg VERSION=${VERSION} \
  --target build-and-test \
  --file buildTestPublish.Dockerfile .
# To copy files we must create a container.  We cannot copy from an image.  The container doesn't start though.
echo "Creating container ${DOCKER_TAG_NAME}:${VERSION} for file copying."
id=$(docker create ${DOCKER_TAG_NAME}:${VERSION})
echo "Copying unit-tests out of container to /unit-tests"
#Docker cp source paths must be from the root.
rm -rf unit-tests | exit 0
mkdir unit-tests
docker cp ${id}:/app_build/The.Solution.Name/The.Solution.Name.HttpClient.Test/unit-tests/junit.xml unit-tests/junit-HttpClient.xml
docker cp ${id}:/app_build/The.Solution.Name/The.Solution.Name.Repository.Test/unit-tests/junit.xml unit-tests/junit-Repository.xml
docker cp ${id}:/app_build/The.Solution.Name/The.Solution.Name.Service.Test/unit-tests/junit.xml unit-tests/junit-Service.xml
docker cp ${id}:/app_build/The.Solution.Name/The.Solution.Name.Web.Test/unit-tests/junit.xml unit-tests/junit-Web.xml
echo "Removing container ${DOCKER_TAG_NAME}:${VERSION}."
docker rm -v ${id}

Now that I am building on OpenShift with Kaniko I don't seem to have a way to get artifacts out of the built image. I can't mount a volume to the kaniko image because Gitlab doesn't support running an image with parameters. I have to run the debug image and script the executor like:

build:
  stage: build
  <<: *runners
  <<: *except_master_and_prodfix
  variables:
    #Provides the base registry path to which /cache will be appended.
    AWS_ACCESS_KEY_ID: $DEV_AWS_ACCESS_KEY_ID
    AWS_SECRET_ACCESS_KEY: $DEV_AWS_SECRET_ACCESS_KEY
  image:
    name: gcr.io/kaniko-project/executor:debug
    entrypoint: [ "sh" ]
  artifacts:
    paths:
      - artifacts/
  script:
    # We cannot git merge from master here because busybox used in Kaniko does not have git nor does it have
    # a package installer.
    # Docker command is not available in Kaniko image so we have to create the .docker/config.json file manually.
    - echo "$DOCKER_AUTH_CONFIG" > /kaniko/.docker/config.json
    - mkdir -p artifacts
    #This builds but does not push to the registry
    - /kaniko/executor
      --context $CI_PROJECT_DIR
      --no-push
      --skip-unused-stages=true
      --cache=true
      --cache-repo=${CI_REGISTRY_IMAGE}/cache
      --log-timestamp=true
      --log-format=text
      --target build-and-test

If there isn't currently a way to "mount" a file path into the executor it would be helpful to be able to do so, such that generated artifacts can be copied to the mounted path (ex. /artifacts) and they would be written to the file system captured by Gitlab.

[ilionblaze]

I've run into this same issue, needing to extract the results of junit tests for reporting. This would be extremely useful.

[dpinchukov-ueni]

Same thing here. Currently I have to develop ugly hacks to build the project into a local tar file, then extracting artifacts to it, instead of simply telling kaniko to store artifacts in a directory that stays available after the build has finished.