# https://circleci.com/docs/2.0/

# We use version 2.1 of CircleCI's configuration format (the docs are still at
# the 2.0 link) in order to have access to Windows executors. This means we
# can't use dots in job names anymore. They have a new "parameters" feature
# that is supposed to remove the need to have version numbers in job names (the
# source of our dots), but switching to that is going to be a bigger refactor:
#
#   https://discuss.circleci.com/t/v2-1-job-name-validation/31123
#   https://circleci.com/docs/2.0/reusing-config/
#
version: 2.1

workflows:
  ci:
    jobs:
      # Start with jobs testing various platforms.

      # Every job that pulls a Docker image from Docker Hub needs to provide
      # credentials for that pull operation to avoid being subjected to
      # unauthenticated pull limits shared across all of CircleCI.  Use this
      # first job to define a yaml anchor that can be used to supply a
      # CircleCI job context which makes Docker Hub credentials available in
      # the environment.
      #
      # Contexts are managed in the CircleCI web interface:
      #
      #  https://app.circleci.com/settings/organization/github/tahoe-lafs/contexts
      - "debian-9": &DOCKERHUB_CONTEXT
          context: "dockerhub-auth"

      - "debian-8":
          <<: *DOCKERHUB_CONTEXT
          requires:
            - "debian-9"

      - "ubuntu-20-04":
          <<: *DOCKERHUB_CONTEXT
      - "ubuntu-18-04":
          <<: *DOCKERHUB_CONTEXT
          requires:
            - "ubuntu-20-04"
      - "ubuntu-16-04":
          <<: *DOCKERHUB_CONTEXT
          requires:
            - "ubuntu-20-04"

      - "fedora-29":
          <<: *DOCKERHUB_CONTEXT
      - "fedora-28":
          <<: *DOCKERHUB_CONTEXT
          requires:
            - "fedora-29"

      - "centos-8":
          <<: *DOCKERHUB_CONTEXT

      - "nixos-19-09":
          <<: *DOCKERHUB_CONTEXT

      # Test against PyPy 2.7
      - "pypy27-buster":
          <<: *DOCKERHUB_CONTEXT

      # Just one Python 3.6 configuration while the port is in-progress.
      - "python36":
          <<: *DOCKERHUB_CONTEXT

      # Other assorted tasks and configurations
      - "lint":
          <<: *DOCKERHUB_CONTEXT
      - "pyinstaller":
          <<: *DOCKERHUB_CONTEXT
      - "deprecations":
          <<: *DOCKERHUB_CONTEXT
      - "c-locale":
          <<: *DOCKERHUB_CONTEXT
      # Any locale other than C or UTF-8.
      - "another-locale":
          <<: *DOCKERHUB_CONTEXT

      - "integration":
          <<: *DOCKERHUB_CONTEXT
          requires:
            # If the unit test suite doesn't pass, don't bother running the
            # integration tests.
            - "debian-9"

      # Generate the underlying data for a visualization to aid with Python 3
      # porting.
      - "build-porting-depgraph":
          <<: *DOCKERHUB_CONTEXT

      - "typechecks":
          <<: *DOCKERHUB_CONTEXT

  images:
    # Build the Docker images used by the ci jobs.  This makes the ci jobs
    # faster and takes various spurious failures out of the critical path.
    triggers:
      # Build once a day
      - schedule:
          cron: "0 0 * * *"
          filters:
            branches:
              only:
                - "master"

    jobs:
      - "build-image-debian-8":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-debian-9":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-ubuntu-16-04":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-ubuntu-18-04":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-ubuntu-20-04":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-fedora-28":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-fedora-29":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-centos-8":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-pypy27-buster":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-python36-ubuntu":
          <<: *DOCKERHUB_CONTEXT


jobs:
  dockerhub-auth-template:
    # This isn't a real job.  It doesn't get scheduled as part of any
    # workflow.  Instead, it's just a place we can hang a yaml anchor to
    # finish the Docker Hub authentication configuration.  Workflow jobs using
    # the DOCKERHUB_CONTEXT anchor will have access to the environment
    # variables used here.  These variables will allow the Docker Hub image
    # pull to be authenticated and hopefully avoid hitting and rate limits.
    docker: &DOCKERHUB_AUTH
      - image: "null"
        auth:
          username: $DOCKERHUB_USERNAME
          password: $DOCKERHUB_PASSWORD

    steps:
      - run:
          name: "CircleCI YAML schema conformity"
          command: |
            # This isn't a real command.  We have to have something in this
            # space, though, or the CircleCI yaml schema validator gets angry.
            # Since this job is never scheduled this step is never run so the
            # actual value here is irrelevant.

  lint:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "circleci/python:2"

    steps:
      - "checkout"

      - run:
          name: "Install tox"
          command: |
            pip install --user tox

      - run:
          name: "Static-ish code checks"
          command: |
            ~/.local/bin/tox -e codechecks

  pyinstaller:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "circleci/python:2"

    steps:
      - "checkout"

      - run:
          name: "Install tox"
          command: |
            pip install --user tox

      - run:
          name: "Make PyInstaller executable"
          command: |
            ~/.local/bin/tox -e pyinstaller

      - run:
          # To verify that the resultant PyInstaller-generated binary executes
          # cleanly (i.e., that it terminates with an exit code of 0 and isn't
          # failing due to import/packaging-related errors, etc.).
          name: "Test PyInstaller executable"
          command: |
            dist/Tahoe-LAFS/tahoe --version

  debian-9: &DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/debian:9-py2.7"
        user: "nobody"

    environment: &UTF_8_ENVIRONMENT
      # In general, the test suite is not allowed to fail while the job
      # succeeds.  But you can set this to "yes" if you want it to be
      # otherwise.
      ALLOWED_FAILURE: "no"
      # Tell Hypothesis which configuration we want it to use.
      TAHOE_LAFS_HYPOTHESIS_PROFILE: "ci"
      # Tell the C runtime things about character encoding (mainly to do with
      # filenames and argv).
      LANG: "en_US.UTF-8"
      # Select a tox environment to run for this job.
      TAHOE_LAFS_TOX_ENVIRONMENT: "py27-coverage"
      # Additional arguments to pass to tox.
      TAHOE_LAFS_TOX_ARGS: ""
      # The path in which test artifacts will be placed.
      ARTIFACTS_OUTPUT_PATH: "/tmp/artifacts"
      # Convince all of our pip invocations to look at the cached wheelhouse
      # we maintain.
      WHEELHOUSE_PATH: &WHEELHOUSE_PATH "/tmp/wheelhouse"
      PIP_FIND_LINKS: "file:///tmp/wheelhouse"
      # Upload the coverage report.
      UPLOAD_COVERAGE: "yes"

    # pip cannot install packages if the working directory is not readable.
    # We want to run a lot of steps as nobody instead of as root.
    working_directory: "/tmp/project"

    steps:
      - "checkout"
      - run: &SETUP_VIRTUALENV
          name: "Setup virtualenv"
          command: |
            /tmp/project/.circleci/setup-virtualenv.sh \
                "/tmp/venv" \
                "/tmp/project" \
                "${WHEELHOUSE_PATH}" \
                "${TAHOE_LAFS_TOX_ENVIRONMENT}" \
                "${TAHOE_LAFS_TOX_ARGS}"

      - run: &RUN_TESTS
          name: "Run test suite"
          command: |
            /tmp/project/.circleci/run-tests.sh \
                "/tmp/venv" \
                "/tmp/project" \
                "${ALLOWED_FAILURE}" \
                "${ARTIFACTS_OUTPUT_PATH}" \
                "${TAHOE_LAFS_TOX_ENVIRONMENT}" \
                "${TAHOE_LAFS_TOX_ARGS}"
          # trial output gets directed straight to a log.  avoid the circleci
          # timeout while the test suite runs.
          no_output_timeout: "20m"

      - store_test_results: &STORE_TEST_RESULTS
          path: "/tmp/artifacts/junit"

      - store_artifacts: &STORE_TEST_LOG
          # Despite passing --workdir /tmp to tox above, it still runs trial
          # in the project source checkout.
          path: "/tmp/project/_trial_temp/test.log"

      - store_artifacts: &STORE_OTHER_ARTIFACTS
          # Store any other artifacts, too.  This is handy to allow other jobs
          # sharing most of the definition of this one to be able to
          # contribute artifacts easily.
          path: "/tmp/artifacts"

      - run: &SUBMIT_COVERAGE
          name: "Submit coverage results"
          command: |
            if [ -n "${UPLOAD_COVERAGE}" ]; then
              /tmp/venv/bin/codecov
            fi


  debian-8:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/debian:8-py2.7"
        user: "nobody"


  pypy27-buster:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/pypy:buster-py2"
        user: "nobody"

    environment:
      <<: *UTF_8_ENVIRONMENT
      # We don't do coverage since it makes PyPy far too slow:
      TAHOE_LAFS_TOX_ENVIRONMENT: "pypy27"
      # Since we didn't collect it, don't upload it.
      UPLOAD_COVERAGE: ""


  c-locale:
    <<: *DEBIAN

    environment:
      <<: *UTF_8_ENVIRONMENT
      LANG: "C"


  another-locale:
    <<: *DEBIAN

    environment:
      <<: *UTF_8_ENVIRONMENT
      # aka "Latin 1"
      LANG: "en_US.ISO-8859-1"


  deprecations:
    <<: *DEBIAN

    environment:
      <<: *UTF_8_ENVIRONMENT
      # Select the deprecations tox environments.
      TAHOE_LAFS_TOX_ENVIRONMENT: "deprecations,upcoming-deprecations"
      # Put the logs somewhere we can report them.
      TAHOE_LAFS_WARNINGS_LOG: "/tmp/artifacts/deprecation-warnings.log"
      # The deprecations tox environments don't do coverage measurement.
      UPLOAD_COVERAGE: ""


  integration:
    <<: *DEBIAN

    environment:
      <<: *UTF_8_ENVIRONMENT
      # Select the integration tests tox environments.
      TAHOE_LAFS_TOX_ENVIRONMENT: "integration"
      # Disable artifact collection because py.test can't produce any.
      ARTIFACTS_OUTPUT_PATH: ""

    steps:
      - "checkout"
      # DRY, YAML-style.  See the debian-9 steps.
      - run: *SETUP_VIRTUALENV
      - run: *RUN_TESTS


  ubuntu-16-04:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:16.04-py2.7"
        user: "nobody"


  ubuntu-18-04: &UBUNTU_18_04
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py2.7"
        user: "nobody"


  python36:
    <<: *UBUNTU_18_04
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py3"
        user: "nobody"

    environment:
      <<: *UTF_8_ENVIRONMENT
      # The default trial args include --rterrors which is incompatible with
      # this reporter on Python 3.  So drop that and just specify the
      # reporter.
      TAHOE_LAFS_TRIAL_ARGS: "--reporter=subunitv2-file"
      TAHOE_LAFS_TOX_ENVIRONMENT: "py36-coverage"


  ubuntu-20-04:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:20.04"
        user: "nobody"


  centos-8: &RHEL_DERIV
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/centos:8-py2"
        user: "nobody"

    environment: *UTF_8_ENVIRONMENT

    # pip cannot install packages if the working directory is not readable.
    # We want to run a lot of steps as nobody instead of as root.
    working_directory: "/tmp/project"

    steps:
      - "checkout"
      - run: *SETUP_VIRTUALENV
      - run: *RUN_TESTS
      - store_test_results: *STORE_TEST_RESULTS
      - store_artifacts: *STORE_TEST_LOG
      - store_artifacts: *STORE_OTHER_ARTIFACTS
      - run: *SUBMIT_COVERAGE


  fedora-28:
    <<: *RHEL_DERIV
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/fedora:28-py"
        user: "nobody"


  fedora-29:
    <<: *RHEL_DERIV
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/fedora:29-py"
        user: "nobody"


  nixos-19-09:
    docker:
      # Run in a highly Nix-capable environment.
      - <<: *DOCKERHUB_AUTH
        image: "nixorg/nix:circleci"

    environment:
      NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.09-small.tar.gz"

    steps:
      - "checkout"
      - "run":
          name: "Build and Test"
          command: |
            # CircleCI build environment looks like it has a zillion and a
            # half cores.  Don't let Nix autodetect this high core count
            # because it blows up memory usage and fails the test run.  Pick a
            # number of cores that suites the build environment we're paying
            # for (the free one!).
            #
            # Also, let it run more than one job at a time because we have to
            # build a couple simple little dependencies that don't take
            # advantage of multiple cores and we get a little speedup by doing
            # them in parallel.
            nix-build --cores 3 --max-jobs 2 nix/

  # Generate up-to-date data for the dependency graph visualizer.
  build-porting-depgraph:
    # Get a system in which we can easily install Tahoe-LAFS and all its
    # dependencies.  The dependency graph analyzer works by executing the code.
    # It's Python, what do you expect?
    <<: *DEBIAN

    steps:
      - "checkout"

      - add_ssh_keys:
          fingerprints:
            # Jean-Paul Calderone <exarkun@twistedmatrix.com> (CircleCI depgraph key)
            # This lets us push to tahoe-lafs/tahoe-depgraph in the next step.
            - "86:38:18:a7:c0:97:42:43:18:46:55:d6:21:b0:5f:d4"

      - run:
          name: "Setup Python Environment"
          command: |
            /tmp/venv/bin/pip install -e /tmp/project

      - run:
          name: "Generate dependency graph data"
          command: |
            . /tmp/venv/bin/activate
            ./misc/python3/depgraph.sh

  typechecks:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py3"

    steps:
      - "checkout"
      - run:
          name: "Validate Types"
          command: |
            /tmp/venv/bin/tox -e typechecks

  build-image: &BUILD_IMAGE
    # This is a template for a job to build a Docker image that has as much of
    # the setup as we can manage already done and baked in.  This cuts down on
    # the per-job setup time the actual testing jobs have to perform - by
    # perhaps 10% - 20%.
    #
    # https://circleci.com/blog/how-to-build-a-docker-image-on-circleci-2-0/
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "docker:17.05.0-ce-git"

    environment:
      DISTRO: "tahoelafsci/<DISTRO>:foo-py2"
      TAG: "tahoelafsci/distro:<TAG>-py2"
      PYTHON_VERSION: "tahoelafsci/distro:tag-py<PYTHON_VERSION}"

    steps:
      - "checkout"
      - "setup_remote_docker"
      - run:
          name: "Log in to Dockerhub"
          command: |
            docker login -u ${DOCKERHUB_USERNAME} -p ${DOCKERHUB_PASSWORD}
      - run:
          name: "Build image"
          command: |
            docker \
                build \
                --build-arg TAG=${TAG} \
                --build-arg PYTHON_VERSION=${PYTHON_VERSION} \
                -t tahoelafsci/${DISTRO}:${TAG}-py${PYTHON_VERSION} \
                -f ~/project/.circleci/Dockerfile.${DISTRO} \
                ~/project/
      - run:
          name: "Push image"
          command: |
            docker push tahoelafsci/${DISTRO}:${TAG}-py${PYTHON_VERSION}


  build-image-debian-8:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "debian"
      TAG: "8"
      PYTHON_VERSION: "2.7"


  build-image-debian-9:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "debian"
      TAG: "9"
      PYTHON_VERSION: "2.7"


  build-image-ubuntu-16-04:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "ubuntu"
      TAG: "16.04"
      PYTHON_VERSION: "2.7"


  build-image-ubuntu-18-04:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "ubuntu"
      TAG: "18.04"
      PYTHON_VERSION: "2.7"


  build-image-python36-ubuntu:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "ubuntu"
      TAG: "18.04"
      PYTHON_VERSION: "3"


  build-image-ubuntu-20-04:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "ubuntu"
      TAG: "20.04"
      PYTHON_VERSION: "2.7"


  build-image-centos-8:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "centos"
      TAG: "8"
      PYTHON_VERSION: "2"


  build-image-fedora-28:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "fedora"
      TAG: "28"
      # The default on Fedora (this version anyway) is still Python 2.
      PYTHON_VERSION: ""


  build-image-fedora-29:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "fedora"
      TAG: "29"


  build-image-pypy27-buster:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "pypy"
      TAG: "buster"
      # We only have Python 2 for PyPy right now so there's no support for
      # setting up PyPy 3 in the image building toolchain.  This value is just
      # for constructing the right Docker image tag.
      PYTHON_VERSION: "2"