docker-ci-deploy 0.3.0

Python script to help push Docker images to a registry using CI services

docker-ci-deploy
================

`|PyPI| <https://pypi.python.org/pypi/docker-ci-deploy>`_ `|Build
Status| <https://travis-ci.org/praekeltfoundation/docker-ci-deploy>`_
`|codecov| <https://codecov.io/gh/praekeltfoundation/docker-ci-deploy>`_

NOTE: The ``-l``/``--login`` parameter (and associated
``-d``/``--debug`` parameter) has been removed in version 0.3.0. Use
a manual ``docker login`` command in the ``before_deploy`` section
of your Travis file (or equivalent) to log in.

A command-line tool to help generate tags and push Docker images to a
registry. Simplifies deployment of Docker images from CI services such
as Travis CI.

In a single command, ``docker-ci-deploy`` can: \* Change the tags on
images \* Add version information to image tags \* Add registry
addresses to image tags \* Push tags to a registry

The best way to try out ``docker-ci-deploy`` is to give it a spin with
the ``--dry-run`` flag and observe all the ``docker`` commands that it
*would* invoke: \`\`\` > $ docker-ci-deploy --version 2.7.13
--version-semver --version-latest
--registry registry:5000 --dry-run
praekeltorg/alpine-python
praekeltorg/alpine-python:onbuild

docker tag praekeltorg/alpine-python
registry:5000/praekeltorg/alpine-python:2.7.13 docker tag
praekeltorg/alpine-python registry:5000/praekeltorg/alpine-python:2.7
docker tag praekeltorg/alpine-python
registry:5000/praekeltorg/alpine-python:2 docker tag
praekeltorg/alpine-python registry:5000/praekeltorg/alpine-python:latest
docker tag praekeltorg/alpine-python:onbuild
registry:5000/praekeltorg/alpine-python:2.7.13-onbuild docker tag
praekeltorg/alpine-python:onbuild
registry:5000/praekeltorg/alpine-python:2.7-onbuild docker tag
praekeltorg/alpine-python:onbuild
registry:5000/praekeltorg/alpine-python:2-onbuild docker tag
praekeltorg/alpine-python:onbuild
registry:5000/praekeltorg/alpine-python:onbuild docker push
registry:5000/praekeltorg/alpine-python:2.7.13 docker push
registry:5000/praekeltorg/alpine-python:2.7 docker push
registry:5000/praekeltorg/alpine-python:2 docker push
registry:5000/praekeltorg/alpine-python:latest docker push
registry:5000/praekeltorg/alpine-python:2.7.13-onbuild docker push
registry:5000/praekeltorg/alpine-python:2.7-onbuild docker push
registry:5000/praekeltorg/alpine-python:2-onbuild docker push
registry:5000/praekeltorg/alpine-python:onbuild \`\`\`

If you want to make your commands even shorter, the ``docker-ci-deploy``
command is also available as just ``dcd``, and most options have a short
form: \`\`\` > $ dcd -V 3.6.0 -S -L -r registry:5000 --dry-run
alpine-python

docker tag alpine-python registry:5000/alpine-python:3.6.0 docker tag
alpine-python registry:5000/alpine-python:3.6 docker tag alpine-python
registry:5000/alpine-python:3 docker tag alpine-python
registry:5000/alpine-python:latest docker push
registry:5000/alpine-python:3.6.0 docker push
registry:5000/alpine-python:3.6 docker push
registry:5000/alpine-python:3 docker push
registry:5000/alpine-python:latest \`\`\`

Use the ``-h``/``--help`` option to see all available options.

Installation
------------

::

pip install docker-ci-deploy==0.2.0

The script is self-contained and has no dependencies. It can be run by
simply executing the `main file <docker-ci-deploy/__main__.py>`_.

Usage
-----

The script can tag an existing image and push the new tags to a
registry.

There is one required argument: the image to push.

Pushing an image
^^^^^^^^^^^^^^^^

::

docker-ci-deploy my-image:latest

This will simply push the image ``my-image:latest`` to the default
registry (https://hub.docker.com).

Tagging
^^^^^^^

\`\`\` docker-ci-deploy --tag alpine --tag $(git rev-parse --short HEAD)
my-image:latest

\`\```This will result in the tags``my-image:alpine``and``my-image:eea981f``(for example) being created and pushed (**Note:** the original tag``my-image:latest\`
is *not* pushed).

Version tags
^^^^^^^^^^^^

``docker-ci-deploy --tag alpine --version 1.2.3 my-image`` This will
result in the tag ``my-image:1.2.3-alpine`` being created and pushed. If
a version is already present in the start of a tag, it will not be
added. For example, in the above example if ``--tag 1.2.3-alpine`` were
provided, the image would still be tagged with ``1.2.3-alpine``, not
``1.2.3-1.2.3-alpine``.

You can also push the tags without the version information so that they
are considered the "latest" tag:
``docker-ci-deploy --version 1.2.3 --version-latest my-image`` This will
result in the tags ``my-image:1.2.3`` and ``my-image:latest`` being
pushed.

NOTE: The ``--version`` and ``--version-latest`` options used to be
known as ``--tag-version`` and ``--tag-latest``, respectively. These
old option names will continue working for the current release but
will be removed soon.

Semantic version tags
^^^^^^^^^^^^^^^^^^^^^

``docker-ci-deploy --tag alpine --version 1.2.3 --version-semver my-image``
This will result in the tags ``my-image:1.2.3-alpine``,
``my-image:1.2-alpine``, and ``my-image:1-alpine`` being created and
pushed. If part of the version is already present in the start of a tag,
it will not be added. For example, in the above example if
``--tag 1.2-alpine`` were provided, the image would still be tagged with
``1.2.3-alpine``, not ``1.2.3-1.2-alpine``.

This works by stripping pieces from the front of the version string
using the regex ``[.-]?\w+$``. This means that version strings with some
text in them are also supported. For example, a tag such as
``8.7.1-jessie`` will produce the tags/tag prefixes ``8.7.1-jessie``,
``8.7.1``, ``8.7``, and ``8``.

An optional "precision" value can be set using the
``--semver-precision`` option. This sets the minimum precision of the
generated versions. For example, by passing
``--version 1.2.3 --version-semver --semver-precision 2``, the versions
``1.2.3`` and ``1.2`` are generated but *not* ``1``.

Note that this will **not** tag a version ``0`` unless the
``--semver-zero`` option is also used.

This can be used in combination with ``--version-latest``.

NOTE: The ``--version-semver`` option used to be known as
``--tag-version``. This old option name will continue working for
the current release but will be removed soon.

Custom registry
^^^^^^^^^^^^^^^

``docker-ci-deploy \ --tag alpine --tag $(git rev-parse --short HEAD) \ --registry my-registry.example.com:5000 \ my-image:latest``
This will result in the tags
``my-registry.example.com:5000/my-image:alpine`` and
``my-registry.example.com:5000/my-image:eea981f`` being created and
pushed.

**NOTE:** The reference grammar for Docker image tags (as of Docker
1.13.0) is not strict enough to distinguish between a registry address
and an image name component in all cases. For example, the tag
``praekeltorg/alpine-python`` could refer to the image with name
``alpine-python`` stored in the registry with hostname ``praekeltorg``
*or* it could be an image called ``praekeltorg/alpine-python`` stored in
the default registry. ``docker-ci-deploy`` will first just prepend the
registry address to the tag and only attempt to remove an existing
registry address from the tag if the new tag is invalid.

Multiple images
^^^^^^^^^^^^^^^

You can provide multiple images to ``docker-ci-deploy`` and it will tag
and push all of them:
``docker-ci-deploy --tag $(git rev-parse --short HEAD) my-image my-other-image``
This will result in the tags ``my-image:eea981f`` and
``my-other-image:eea981f`` being created and pushed.

Debugging
^^^^^^^^^

Use the ``--dry-run`` and ``--verbose`` parameters to see what the
script will do before you use it. For more help try
``docker-ci-deploy --help``.

Travis CI
---------

The script could be used in any CI service that provides access to the
standard Docker CLI but was developed with Travis in mind.

For Travis CI this config should get you started pushing images to
Docker Hub: \`\`\`yaml sudo: required services: - docker language:
python env: global: - DOCKER\_USER=janedoe - secret: #
DOCKER\_PASS=pa$$word

before\_install: - sudo apt-get update - sudo apt-get install -o
Dpkg::Options::="--force-confold" -y docker-engine - pip install
docker-ci-deploy

script: - docker build -t janedoe/my-image .

before\_deploy: - docker login -u ":math:`DOCKER_USER" -p "`\ DOCKER\_PASS"
deploy: provider: script script: docker-ci-deploy --tag $(git rev-parse
--short HEAD) --tag latest janedoe/my-image \`\`\`

.. |PyPI| image:: https://img.shields.io/pypi/v/docker-ci-deploy.svg
.. |Build
Status| image:: https://travis-ci.org/praekeltfoundation/docker-ci-deploy.svg?branch=develop
.. |codecov| image:: https://codecov.io/gh/praekeltfoundation/docker-ci-deploy/branch/develop/graph/badge.svg