machine:
    environment:
        OS: "linux"
        ARCH: "amd64"

        PROTOC: "https://github.com/google/protobuf/releases/download/v3.2.0/protoc-3.2.0-linux-x86_64.zip"

        GOVERSION: "1.8.4"
        GOPATH: "$HOME/.go_workspace"

        WORKDIR:  "$GOPATH/src/github.com/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME"

# Disable default dependency management.
# This prevents go dependencies to be automatically installed in order to
# ensure we are exclusively relying on vendored deps.
#
# https://discuss.circleci.com/t/overriding-go-inference-in-the-dependencies-phase/660
# https://robots.thoughtbot.com/configure-circleci-for-go
dependencies:
    pre:
        # Wipe out the default go install.
        - sudo rm -rf /usr/local/go

        # Force the wipe out of GOPATH to make sure we're not relying on
        # external dependencies.
        - rm -rf "$GOPATH"

    override:
        # Install Go
        - wget "https://storage.googleapis.com/golang/go$GOVERSION.$OS-$ARCH.tar.gz"
        - sudo tar -C /usr/local -xzf "go$GOVERSION.$OS-$ARCH.tar.gz"

        # Install protoc
        - wget "$PROTOC"
        - unzip -o "$(basename $PROTOC)" -d "$HOME"
        - sudo cp -R "$HOME/include/google" /usr/local/include
        - sudo chmod 777 -R /usr/local/include/google

        # Setup the GOPATH
        - mkdir -p "$(dirname $WORKDIR)"
        - cp -R "$HOME/$CIRCLE_PROJECT_REPONAME" "$WORKDIR"

        # Install dependencies
        - cd "$WORKDIR" && make setup

    post:
        # Display debugging information in CI logs
        - go version
        - env

test:
    pre:
        # Ensure validation of dependencies
        - cd "$WORKDIR" && git fetch origin
        - cd "$WORKDIR" && if test -n "`git diff --stat=1000 origin/master | grep -E \"^[[:space:]]*vendor\"`"; then make dep-validate; fi

    override:
        # Run all tests in a single pass to ensure we don't move to the next
        # step in case of failure.
        # - `all`: Format, build and tests.
        # - `checkprotos`: Build and check the proto files *only* once all
        #                  tests pass with checked-in generated code.
        # - `coverage`: Generate coverage reports.
        - sudo mkdir /tmpfs
        - sudo mount -t tmpfs tmpfs /tmpfs
        - sudo chown 1000:1000 /tmpfs
        - cd "$WORKDIR" && TMPDIR=/tmpfs make ci

    post:
        # Report to codecov.io
        - cd "$WORKDIR" && bash <(curl -s https://codecov.io/bash)