Circle CI helpers

Project is intended to bring handy tools to make use of the Circle CI a bit more pleasant.

circle-matrix

The big difference of Circle CI from Travis is the lack of Matrix builds support. This sometimes is really painful because the circle.yml becomes clumsy and hard to read. Just creating a matrix based on some environment variables turns into if-bashery with $CIRCLE_NODE_INDEX checks, readability degrades almost to zero.

circle-matrix is a helper which can be used to create one-dimensional environment matrices using travis like syntax. For example:

dependencies:
  pre:
    - sudo -H pip install --upgrade pip
    - sudo -H pip install circleci-helpers
test:
  override:
    - ? | 
          circle-matrix <<"EHD"
            env:
              - VERSION=centos6
              - VERSION=centos7
              - VERSION=fedora22
              - VERSION=fedora23

            before_script:
              - env | sort
              - cd "$VERSION"
              - export image="$IMAGE:$VERSION"

            script:
              - test "$(head -n1 Dockerfile)" = "FROM $image-scm"
                && test "$(head -n1 scm/Dockerfile)" = "FROM $image-curl"
                && [[ "$(head -n1 curl/Dockerfile)" == 'FROM centos:'*
                   || "$(head -n1 curl/Dockerfile)" == 'FROM fedora:'* ]]
              - docker build -t "$image-curl" curl
              - docker build -t "$image-scm" scm
              - docker build -t "$image" .
              - ~/official-images/test/run.sh "$image"

            after_script:
              - docker images
          EHD
      :
        parallel: true

So as much as above. It's also worth saying that circle-matrix reads circle-matrix.yml if it presents, otherwise falls back to reading from STDIN. For information how to specify another configuration file please check help (circle-matrix --help).

Running on Circle CI

Matrix runs are automatically distributed between available number of Circle CI nodes ($CIRCLE_NODE_TOTAL). However please don't forget to use the above syntax for the test section (parallel: true) if you are using circle-matrix in this section (the only one which is executed sequentially).

What circle-matrix is and what is not

It's purely environment variables matrix and it's one-dimensional. It can't be used as travis multi-dimensional matrices for example env and python grouped together. It supports travis like execution and the following configuration subset:

Script batches (in execution order):

• before_script
• script
• after_success | after_failure
• after_script

Configuration:

• env - environment list of matrix variables.
• matrix.allow_failures - list of env mappings (env: FOO=foo BAR=bar).

License and Authors

Licensed under MIT (https://opensource.org/licenses/MIT)

• Author:: Denis Baryshev (dennybaa@gmail.com)