[AIRFLOW-2933] Enable Codecov on Docker-CI Build (#3780)

- Add missing variables and use codecov instead of coveralls.
  The issue why it wasn't working was because missing environment variables.
  The codecov library heavily depends on the environment variables in
  the CI to determine how to push the reports to codecov.

- Remove the explicit passing of the variables in the `tox.ini`
  since it is already done in the `docker-compose.yml`,
  having to maintain this at two places makes it brittle.

- Removed the empty Codecov yml since codecov was complaining that
  it was unable to parse it

Author: Fokko

.codecov.yml

@@ -42,17 +42,13 @@ cache:
 before_install:
   - sudo ls -lh $HOME/.cache/pip/
   - sudo rm -rf $HOME/.cache/pip/* $HOME/.wheelhouse/*
-  - sudo chown -R travis.travis $HOME/.cache/pip
+  - sudo chown -R travis:travis $HOME/.cache/pip
 install:
   # Use recent docker-compose version
   - sudo rm /usr/local/bin/docker-compose
   - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
   - chmod +x docker-compose
   - sudo mv docker-compose /usr/local/bin
   - pip install --upgrade pip
-  - pip install codecov
 script:
   - docker-compose --log-level ERROR -f scripts/ci/docker-compose.yml run airflow-testing /app/scripts/ci/run-ci.sh
-after_success:
-  - sudo chown -R travis.travis .
-  - codecov

.travis.yml

@@ -70,11 +70,17 @@ services:
       - SLUGIFY_USES_TEXT_UNIDECODE=yes
       - TOX_ENV
       - PYTHON_VERSION
+      - CI
       - TRAVIS
       - TRAVIS_BRANCH
       - TRAVIS_BUILD_DIR
       - TRAVIS_JOB_ID
+      - TRAVIS_JOB_NUMBER
       - TRAVIS_PULL_REQUEST
+      - TRAVIS_COMMIT
+      - TRAVIS_REPO_SLUG
+      - TRAVIS_OS_NAME
+      - TRAVIS_TAG
     depends_on:
       - postgres
       - mysql

scripts/ci/docker-compose.yml

@@ -33,7 +33,7 @@ ignore = E731,W503
 [testenv]
 deps =
     wheel
-    coveralls
+    codecov
 
 basepython =
     py27: python2.7
@@ -52,18 +52,7 @@ setenv =
   backend_sqlite: AIRFLOW__CORE__SQL_ALCHEMY_CONN=sqlite:///{homedir}/airflow.db
   backend_sqlite: AIRFLOW__CORE__EXECUTOR=SequentialExecutor
 
-passenv =
-    HOME
-    JAVA_HOME
-    USER
-    PATH
-    BOTO_CONFIG
-    TRAVIS
-    TRAVIS_BRANCH
-    TRAVIS_BUILD_DIR
-    TRAVIS_JOB_ID
-    TRAVIS_PULL_REQUEST
-    SLUGIFY_USES_TEXT_UNIDECODE
+passenv = *
 
 commands =
   pip wheel --progress-bar off -w {homedir}/.wheelhouse -f {homedir}/.wheelhouse -e .[devel_ci]
@@ -74,6 +63,7 @@ commands =
   {toxinidir}/scripts/ci/4-load-data.sh
   {toxinidir}/scripts/ci/5-run-tests.sh []
   {toxinidir}/scripts/ci/6-check-license.sh
+  codecov -e TOXENV
 
 [testenv:flake8]
 basepython = python3