# 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.
      - "debian-10":
          {}
      - "debian-11":
          {}

      - "ubuntu-20-04":
          {}
      - "ubuntu-18-04":
          requires:
            - "ubuntu-20-04"

      # Equivalent to RHEL 8; CentOS 8 is dead.
      - "oraclelinux-8":
          {}

      - "nixos":
          name: "NixOS 21.05"
          nixpkgs: "21.05"

      - "nixos":
          name: "NixOS 21.11"
          nixpkgs: "21.11"

      # Eventually, test against PyPy 3.8
      #- "pypy27-buster":
      #    {}

      # Other assorted tasks and configurations
      - "codechecks":
          {}
      - "pyinstaller":
          {}
      - "c-locale":
          {}
      # Any locale other than C or UTF-8.
      - "another-locale":
          {}

      - "integration":
          requires:
            # If the unit test suite doesn't pass, don't bother running the
            # integration tests.
            - "debian-11"

      - "typechecks":
          {}
      - "docs":
          {}

  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:
      # Every job that pushes a Docker image from Docker Hub needs to provide
      # credentials.  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
      - "build-image-debian-10": &DOCKERHUB_CONTEXT
          context: "dockerhub-auth"
      - "build-image-debian-11":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-ubuntu-18-04":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-ubuntu-20-04":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-fedora-35":
          <<: *DOCKERHUB_CONTEXT
      - "build-image-oraclelinux-8":
          <<: *DOCKERHUB_CONTEXT
      # Restore later as PyPy38
      #- "build-image-pypy27-buster":
      #    <<: *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.

  codechecks:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "cimg/python:3.9"

    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: "cimg/python:3.9"

    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-10: &DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/debian:10-py3.7"
        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: "py37"
      # 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: ""

    # 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_ELIOT_LOG
          # Despite passing --workdir /tmp to tox above, it still runs trial
          # in the project source checkout.
          path: "/tmp/project/eliot.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-11:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/debian:11-py3.9"
        user: "nobody"
    environment:
      <<: *UTF_8_ENVIRONMENT
      TAHOE_LAFS_TOX_ENVIRONMENT: "py39"

  # Restore later using PyPy3.8
  # 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"

  integration:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/debian:11-py3.9"
        user: "nobody"

    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-18-04: &UBUNTU_18_04
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py3.7"
        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: "py37"


  ubuntu-20-04:
    <<: *DEBIAN
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:20.04-py3.9"
        user: "nobody"
    environment:
      <<: *UTF_8_ENVIRONMENT
      TAHOE_LAFS_TOX_ENVIRONMENT: "py39"

  oraclelinux-8: &RHEL_DERIV
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/oraclelinux:8-py3.8"
        user: "nobody"

    environment:
      <<: *UTF_8_ENVIRONMENT
      TAHOE_LAFS_TOX_ENVIRONMENT: "py38"

    # 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_ELIOT_LOG
      - store_artifacts: *STORE_OTHER_ARTIFACTS
      - run: *SUBMIT_COVERAGE

  fedora-35:
    <<: *RHEL_DERIV
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/fedora:35-py3"
        user: "nobody"

  nixos:
    parameters:
      nixpkgs:
        description: >-
          Reference the name of a niv-managed nixpkgs source (see `niv show`
          and nix/sources.json)
        type: "string"

    docker:
      # Run in a highly Nix-capable environment.
      - <<: *DOCKERHUB_AUTH
        image: "nixos/nix:2.3.16"

    environment:
      # CACHIX_AUTH_TOKEN is manually set in the CircleCI web UI and
      # allows us to push to CACHIX_NAME.  We only need this set for
      # `cachix use` in this step.
      CACHIX_NAME: "tahoe-lafs-opensource"

    steps:
      - "run":
          # The nixos/nix image does not include ssh.  Install it so the
          # `checkout` step will succeed.  We also want cachix for
          # Nix-friendly caching.
          name: "Install Basic Dependencies"
          command: |
            nix-env \
              --file https://github.com/nixos/nixpkgs/archive/nixos-<<parameters.nixpkgs>>.tar.gz \
              --install \
              -A openssh cachix bash

      - "checkout"

      - run:
          name: "Cachix setup"
          # Record the store paths that exist before we did much.  There's no
          # reason to cache these, they're either in the image or have to be
          # retrieved before we can use cachix to restore from cache.
          command: |
            cachix use "${CACHIX_NAME}"
            nix path-info --all > /tmp/store-path-pre-build

      - "run":
          # The Nix package doesn't know how to do this part, unfortunately.
          name: "Generate version"
          command: |
            nix-shell \
              -p 'python3.withPackages (ps: [ ps.setuptools ])' \
              --run 'python setup.py update_version'

      - "run":
          name: "Build"
          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 --argstr pkgsVersion "nixpkgs-<<parameters.nixpkgs>>"

      - "run":
          name: "Test"
          command: |
            # Let it go somewhat wild for the test suite itself
            nix-build --cores 8 --argstr pkgsVersion "nixpkgs-<<parameters.nixpkgs>>" tests.nix

      - run:
          # Send any new store objects to cachix.
          name: "Push to Cachix"
          when: "always"
          command: |
            # Cribbed from
            # https://circleci.com/blog/managing-secrets-when-you-have-pull-requests-from-outside-contributors/
            if [ -n "$CIRCLE_PR_NUMBER" ]; then
              # I'm sure you're thinking "CIRCLE_PR_NUMBER must just be the
              # number of the PR being built".  Sorry, dear reader, you have
              # guessed poorly.  It is also conditionally set based on whether
              # this is a PR from a fork or not.
              #
              # https://circleci.com/docs/2.0/env-vars/#built-in-environment-variables
              echo "Skipping Cachix push for forked PR."
            else
              # If this *isn't* a build from a fork then we have the Cachix
              # write key in our environment and we can push any new objects
              # to Cachix.
              #
              # To decide what to push, we inspect the list of store objects
              # that existed before and after we did most of our work.  Any
              # that are new after the work is probably a useful thing to have
              # around so push it to the cache.  We exclude all derivation
              # objects (.drv files) because they're cheap to reconstruct and
              # by the time you know their cache key you've already done all
              # the work anyway.
              #
              # This shell expression for finding the objects and pushing them
              # was from the Cachix docs:
              #
              # https://docs.cachix.org/continuous-integration-setup/circleci.html
              #
              # but they seem to have removed it now.
              bash -c "comm -13 <(sort /tmp/store-path-pre-build | grep -v '\.drv$') <(nix path-info --all | grep -v '\.drv$' | sort) | cachix push $CACHIX_NAME"
            fi

  typechecks:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py3.7"

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

  docs:
    docker:
      - <<: *DOCKERHUB_AUTH
        image: "tahoelafsci/ubuntu:18.04-py3.7"

    steps:
      - "checkout"
      - run:
          name: "Build documentation"
          command: |
            /tmp/venv/bin/tox -e docs

  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
        # CircleCI build images; https://github.com/CircleCI-Public/cimg-base
        # for details.
        image: "cimg/base:2022.01"

    environment:
      DISTRO: "tahoelafsci/<DISTRO>:foo-py3.9"
      TAG: "tahoelafsci/distro:<TAG>-py3.9"
      PYTHON_VERSION: "tahoelafsci/distro:tag-py<PYTHON_VERSION}"

    steps:
      - "checkout"
      - setup_remote_docker:
          version: "20.10.11"
      - 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-10:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "debian"
      TAG: "10"
      PYTHON_VERSION: "3.7"


  build-image-debian-11:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "debian"
      TAG: "11"
      PYTHON_VERSION: "3.9"

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

    environment:
      DISTRO: "ubuntu"
      TAG: "18.04"
      PYTHON_VERSION: "3.7"


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

    environment:
      DISTRO: "ubuntu"
      TAG: "20.04"
      PYTHON_VERSION: "3.9"


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

    environment:
      DISTRO: "oraclelinux"
      TAG: "8"
      PYTHON_VERSION: "3.8"

  build-image-fedora-35:
    <<: *BUILD_IMAGE

    environment:
      DISTRO: "fedora"
      TAG: "35"
      PYTHON_VERSION: "3"

  # 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"