Monthly Downloads: 300
Programming language: Go
License: MIT License
Tags: Continuous    
Latest version: v3.0.18

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CapsuleCD is a generic Continuous Delivery pipeline for versioned artifacts and libraries written in any language. Its goal is to bring automation to the packaging and deployment stage of your library release cycle. CapsuleCD is incredibly flexible, and works best when implemented side-by-side with a CI pipeline.

A short list of the features...

  • Supports libraries written in any language. Has built-in support for
    • Chef Cookbooks
    • Python Pip
    • NodeJS Npm Packages
    • Ruby Gems
    • Golang Packages
  • Highly configurable
  • Follows language/library best practices. Including things like:
    • automatically bumping the semvar version number
    • regenerating any *.lock files/ shrinkwrap files with new version
    • creating any recommended files (eg. .gitignore)
    • validates all dependencies exist (by vendoring locally)
    • vulnerability scanning in dependencies
    • running unit tests
    • linting library syntax
    • source formatting
    • generating code coverage reports
    • updating changelog
    • uploading versioned artifact to community hosting service (rubygems/supermarket/pypi/etc)
    • creating a new git tag
    • pushing changes back to source control (github)
    • creating a new release in source control (github) and attaching any common artifacts



What is CapsuleCD

CapsuleCD is a generic Continuous Delivery pipeline for versioned artifacts and libraries written in any language. Its goal is to bring automation to the packaging and deployment stage of your library release cycle. It automates away all the common steps required when creating a new version of your library.

Why use CapsuleCD

At first glance, it seems simple to publish a new library version. Just bump the version number and publish, right? Well, not always:

  • If your library includes a Gemfile.lock, Berksfile.lock or other common lock files, you'll need to regenerate them as the old version number is embedded inside.
  • Everyone runs their library unit tests before creating a new release (right?!), but what about validating that your library dependencies exist (maybe in your Company's private repo)?
  • How about linting your source, to ensure that it follows common/team conventions?
  • Who owns the gem? Is there one developer who has the credentials to push to RubyGems.org? Are they still on your team/on vacation?
  • Did you remember to tag your source when the new version was created (making it easy to determine what's changed between versions?)
  • Did you update your changelog?

CapsuleCD handles all of that (and more!) for you. It pretty much guarantees that your library will have proper and consistent releases every time. CapsuleCD is well structured and fully tested, unlike the release scripts you've manually cobbled together for each library and language. It can be customized as needed without rewriting from scratch. The best part is that CapsuleCD uses CapsuleCD to automate its releases. We dogfood it so we're the first ones to find any issues with a new release.

How do I start?

You can use CapsuleCD to automate creating a new release from a pull request or from the latest code on your default branch.

Automated pull request processing:

Here's how to use docker to merge a pull request to your Ruby library

docker run \
-e CAPSULE_SCM_REPO_FULL_NAME=AnalogJ/gem_analogj_test \
AnalogJ/capsulecd:ruby capsulecd start --scm github --package_type ruby

Or you could download the latest linux release, and call CapsuleCD directly to merge a pull request to your Python library:

CAPSULE_SCM_REPO_FULL_NAME=AnalogJ/pip_analogj_test \
CAPSULE_PYPI_PASSWORD=mysupersecurepassword \
capsulecd start --scm github --package_type python

Creating a branch release

TODO: add documentation on how to create a release from the master branch without a pull request. Specify the env variables required. 


Every package type is mapped to an engine class which inherits from a EngineScm class, ie EnginePython, EngineNode, EngineRuby etc. Every SCM type is mapped to a SCM class, ie ScmGithub. When CapsuleCD starts, it initializes the specified Engine, and loads the correct SCM module. Then it begins processing your source code step by step.

Step Description
pipeline_init_step This will initialize the SCM client, ensuring that we can authenticate with the git server
scm_retrieve_payload_step If a Pull Request # is specified, the payload is retrieved from SCM api, otherwise the repo default branch HEAD info is retrived.
scm_process_pull_request_payload or scm_process_push_payload Depending on the retrieve_payload step, the merged pull request is cloned, or the default branch is cloned locally
assemble_step Code is built, which includes adding any missing files/default structure, version bumping, etc.
dependencies_step Download package dependencies
compile_step Optional compilation of source into binaries
test_step Run the package test runner(s) (eg. npm test, rake test, kitchen test, tox), linter, formatter & dependency vulnerbility scanner
package_step Clean any unnecessary files, commit any local changes and create a git tag. Nothing should be pushed to remote repository
dist_step Push the release to the package repository (ie. npm, chef supermarket, rubygems)
scm_publish Push the merged, tested and version updated code up to the source code repository. Also do any source specific releases (github release, asset uploading, etc)


Specifying your GITHUB_ACCESS_TOKEN and PYPI_PASSWORD via an environmental variable might make sense, but do you really want to specify the PYPI_USERNAME, REPO_FULL_NAME each time? Probably not.

CapsuleCD has you covered. We support a global YAML configuration file (that can be specified using the --config_file flag), and a repo specific YAML configuration file stored as capsule.yml inside the repo itself.

Setting Inheritance/Overrides

CapsuleCD settings are determined by loading configuration in the following order (where the last value specified is used)

  • system YAML config file (--config-file)
  • repo YAML config file (capsule.yml)
  • environmental variables (setting in capital letters and prefixed with CAPSULE_)

Configuration Settings

Check the [example.capsule.yml](example.capsule.yml) file for a full list of all the available coniguration options.

As mentioned above, all settings can be specified via Environmental variable. All you need to do is convert the setting to uppercase and then prefix it with CAPSULE_. So pypi_password can be set with CAPSULE_PYPI_PASSWORD and engine_cmd_test with CAPSULE_ENGINE_CMD_TEST

Example System Configuration File

Here's what an example system configuration file might look like:

scm_git_parent_path: /srv/myclonefolder
scm_github_api_endpoint: https://git.mycorpsubnet.example.com/v2
scm_github_web_endpoint: https://git.mycorpsubnet.example.com/v2

Step pre/post hooks and overrides

CapsuleCD is completely customizable, to the extent that you can run your own Ruby code as pre and post hooks before every step. To add a pre/post hook or override a step, just modify your config yml file by adding the step you want to modify, and specify pre or post as a subkey. Then specify your shell commands as a list

      - echo "override pre_scm_configure"
      - `git clone ...`
    post: |
      # do additional cleanup or anything else you want.
      - echo "override post_scm_configure"
    post: |
      # this post hook runs after the assemble_step runs
      - echo "override post_build_step"


Test suite and continuous integration

CapsuleCD provides an extensive test-suite based on go test and a full integration suite which uses go-vcr. You can run all the integration & unit tests with go test $(glide novendor)

CircleCI is used for continuous integration testing: https://circleci.com/gh/AnalogJ/capsulecd


If you'd like to help improve CapsuleCD, follow the instructions in [CONTRIBUTING.md](CONTRIBUTING.md)

Note that if you would like to do development without Docker, you'll also need to ensure that you have the git2go dependencies installed on your machine. You can install these dependencies by using your system's package manager.

- openssl
- libgit2
- libssh2

Work your magic and then submit a pull request. We love pull requests!

If you find the documentation lacking, help us out and update this README.md. If you don't have the time to work on CapsuleCD, but found something we should know about, please submit an issue.

To-do List

We're actively looking for pull requests in the following areas:

  • CapsuleCD Engines for other languages
  • CapsuleCD Sources
    • GitLab
    • Bitbucket
    • Beanstalk
    • Kiln
    • Any others you can think of


We use SemVer for versioning. For the versions available, see the tags on this repository.


Jason Kulatunga - Initial Development - @AnalogJ


CapsuleCD is licensed under the MIT License - see the LICENSE.md file for details


*Note that all licence references and agreements mentioned in the CapsuleCD README section above are relevant to that project's source code only.