Change CircleCI config to 2.0 version

Environment variables are moved out to a script, because CircleCI 2.0
does not support expansion of '$foo' in 'env' section.

.circleci/config.yml

@@ -1,66 +1,51 @@
-general:
-  branches:
-    ignore:
-      - gh\-pages
-
-machine:
-  pre:
-    - curl -sSL https://s3.amazonaws.com/circle-downloads/install-circleci-docker.sh | bash -s -- 1.10.0
-  services:
-    - docker
-  environment:
-    GOPATH: /home/ubuntu:$GOPATH
-    SRCDIR: /home/ubuntu/src/github.com/weaveworks/weave
-    PATH: $PATH:$HOME/.local/bin:/opt/google-cloud-sdk/bin
-    CLOUDSDK_CORE_DISABLE_PROMPTS: 1
-    STATE: /home/ubuntu/state.env
-    # Base name of VMs for integration tests:
-    NAME: test-$CIRCLE_BUILD_NUM-$CIRCLE_NODE_INDEX
-    TEST_VMS_SETUP_OUTPUT_FILE: $CIRCLE_ARTIFACTS/test_vms_setup_output.txt
-    TEST_VMS_PROV_AND_CONF_LOCK_FILE: $CIRCLE_ARTIFACTS/test_vms_provisioned_and_configured.txt
-    TEST_VMS_READY_LOCK_FILE: $CIRCLE_ARTIFACTS/test_vms_ready.txt
-    # Google Cloud Platorm images for integration tests:
-    USE_IMAGE: 1
-    DISK_NAME_PREFIX: test-$CIRCLE_BUILD_NUM-0
-
-dependencies:
-  cache_directories:
-    - "~/docker"
-  post:
-    - bin/circle-dependencies-post-sources
-    # Provision & configure testing VMs:
-    - "while [ ! -d $SRCDIR ]; do sleep 1; done; $SRCDIR/bin/provision_test_vms.sh":
-        parallel: true
-        background: true
-    - bin/circle-dependencies-post
-
-test:
-  pre:
-    - "$SRCDIR/bin/circle-test-pre":
-        parallel: true
-        background: true
-  override:
-    - "$SRCDIR/bin/circle-test-unit":
-        parallel: true
-    - "$SRCDIR/bin/circle-test-smoke":
-        parallel: true
-        timeout: 360
-  post:
-    - "$SRCDIR/bin/circle-test-teardown":
-        parallel: true
-
-teardown:
-  pre:
-    # Destroy testing VMs:
-    - "cd $SRCDIR/test && ./run-integration-tests.sh destroy":
-        parallel: true
-        background: true
-    - "$SRCDIR/bin/circle-teardown-pre":
-        parallel: true
-
-deployment:
-  master:
-    branch: master
-    owner: weaveworks
-    commands:
-      - "$SRCDIR/bin/circle-deploy-master"
+version: 2
+jobs:
+  build:
+    machine:
+      image: circleci/classic:201709-01
+    environment:
+      GOPATH: /home/circleci
+      SRCDIR: /home/circleci/src/github.com/weaveworks/weave
+      CIRCLE_ARTIFACTS: /tmp/artifacts
+    parallelism: 2
+    steps:
+      - checkout
+      - run: mkdir $CIRCLE_ARTIFACTS
+      # copy source dir and submodule update --init
+      - run: bin/circle-dependencies-post-sources
+      - restore_cache:
+          key: v1-cache-{{ checksum "build/Dockerfile" }}-{{ checksum "build/build.sh" }}
+      # kick off creation of test VMs
+      - run:
+          command: bin/provision_test_vms.sh
+          background: true
+      # create build image and make all
+      - run: bin/circle-dependencies-post
+      - save_cache:
+          key: v1-cache-{{ checksum "build/Dockerfile" }}-{{ checksum "build/build.sh" }}
+          paths:
+            - "~/docker"
+      # when VMs are ready, copy built software to them
+      - run:
+          command: bin/circle-test-pre
+          background: true
+      - run: bin/circle-test-unit
+      - run:
+          command: bin/circle-test-smoke
+          no_output_timeout: 360s
+      # Generate code coverage reports
+      - run: bin/circle-test-teardown
+      # Destroy testing VMs:
+      - run:
+          command: bin/circle-destroy-vms
+          background: true
+      # run goveralls; copy coverage reports to artifacts dir
+      - deploy:
+          command: $SRCDIR/bin/circle-teardown-pre
+      - store_artifacts:
+          path: /tmp/artifacts
+      - deploy:
+          command: |
+            if [ "${CIRCLE_BRANCH}" == "master" ]; then
+              bin/circle-deploy-master
+            fi