config.yml

# Python CircleCI 2.0 configuration file
version: 2
variables:
  restore_repo_cache: &restore_repo_cache
    restore_cache:
      keys:
        - v1-repo-{{ .Environment.CIRCLE_SHA1 }}
  install_tox: &install_tox
    run: pip install tox
  set_workdir: &set_workdir
    working_directory: ~/repo
  requires_get_code: &requires_get_code
    requires:
      - get_code
jobs:
  get_code:
    docker:
      - image: cimg/python:3.7
    <<: *set_workdir
    steps:
      # Replace standard code checkout with shallow clone to speed things up.
      - run:
          name: Checkout code
          command: |-
              # Add github.com to known hosts
              mkdir -p ~/.ssh
              echo 'github.com ssh-rsa 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
              ' >> ~/.ssh/known_hosts

              # Add the user ssh key and set correct perms
              (umask 077; touch ~/.ssh/id_rsa)
              chmod 0600 ~/.ssh/id_rsa
              echo "$CHECKOUT_KEY" > ~/.ssh/id_rsa

              # Use git+ssh instead of https
              git config --global url."ssh://git@github.com".insteadOf "https://github.com" || true
              git config --global gc.auto 0 || true

              # Shallow clone
              git clone --depth=1 "${CIRCLE_REPOSITORY_URL}" .

              if [[ -n "${CIRCLE_PR_NUMBER}" ]]; then
                  # Update PR refs for testing.
                  FETCH_REFS="${FETCH_REFS} +refs/pull/${CIRCLE_PR_NUMBER}/head:pr/${CIRCLE_PR_NUMBER}/head"
                  FETCH_REFS="${FETCH_REFS} +refs/pull/${CIRCLE_PR_NUMBER}/merge:pr/${CIRCLE_PR_NUMBER}/merge"

                  # Retrieve the refs
                  git fetch --force origin ${FETCH_REFS}

                  # Checkout PR merge ref.
                  git checkout -f "pr/${CIRCLE_PR_NUMBER}/merge"

                  # Test for *some* merge conflicts.
                  git branch --merged | grep "pr/${CIRCLE_PR_NUMBER}/head" > /dev/null
              else
                  if [ -n "$CIRCLE_TAG" ]; then
                      git fetch --depth=1 --force origin "refs/tags/${CIRCLE_TAG}"
                  else
                      git fetch --depth=1 --force origin "$CIRCLE_BRANCH:remotes/origin/$CIRCLE_BRANCH"
                  fi
                  if [ -n "$CIRCLE_TAG" ]; then
                      git reset --hard "$CIRCLE_SHA1"
                      git checkout "$CIRCLE_TAG"
                  elif [ -n "$CIRCLE_BRANCH" ]; then
                      git reset --hard "$CIRCLE_SHA1"
                      git checkout -B "$CIRCLE_BRANCH"
                  fi
                  git reset --hard "${CIRCLE_SHA1}"
              fi
      - save_cache:
          key: v1-repo-{{ .Environment.CIRCLE_SHA1 }}
          paths:
            - ~/repo
  validate_test_tools:
    docker:
      - image: cimg/python:3.7
    <<: *set_workdir
    steps:
      - *restore_repo_cache
      - run: sudo apt-get update
      - run: sudo apt-get install -y libxml2-utils
      - *install_tox
      - run: tox -e validate_test_tools
workflows:
  version: 2
  get_code_and_test:
    jobs:
      - get_code
      - validate_test_tools:
          <<: *requires_get_code