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Toshio Kuratomi 52449cc01a AnsiballZ improvements 
Now that we don't need to worry about python-2.4 and 2.5, we can make
some improvements to the way AnsiballZ handles modules.

* Change AnsiballZ wrapper to use import to invoke the module
  We need the module to think of itself as a script because it could be
  coded as:

      main()

  or as:

      if __name__ == '__main__':
          main()

  Or even as:

      if __name__ == '__main__':
          random_function_name()

  A script will invoke all of those.  Prior to this change, we invoked
  a second Python interpreter on the module so that it really was
  a script.  However, this means that we have to run python twice (once
  for the AnsiballZ wrapper and once for the module).  This change makes
  the module think that it is a script (because __name__ in the module ==
  '__main__') but it's actually being invoked by us importing the module
  code.

  There's three ways we've come up to do this.
  * The most elegant is to use zipimporter and tell the import mechanism
    that the module being loaded is __main__:
    * 5959f11c9d/lib/ansible/executor/module_common.py (L175)
    * zipimporter is nice because we do not have to extract the module from
      the zip file and save it to the disk when we do that.  The import
      machinery does it all for us.
    * The drawback is that modules do not have a __file__ which points
      to a real file when they do this.  Modules could be using __file__
      to for a variety of reasons, most of those probably have
      replacements (the most common one is to find a writable directory
      for temporary files.  AnsibleModule.tmpdir should be used instead)
      We can monkeypatch __file__ in fom AnsibleModule initialization
      but that's kind of gross.  There's no way I can see to do this
      from the wrapper.

  * Next, there's imp.load_module():
    * https://github.com/abadger/ansible/blob/340edf7489/lib/ansible/executor/module_common.py#L151
    * imp has the nice property of allowing us to set __name__ to
      __main__ without changing the name of the file itself
    * We also don't have to do anything special to set __file__ for
      backwards compatibility (although the reason for that is the
      drawback):
    * Its drawback is that it requires the file to exist on disk so we
      have to explicitly extract it from the zipfile and save it to
      a temporary file

  * The last choice is to use exec to execute the module:
    * https://github.com/abadger/ansible/blob/f47a4ccc76/lib/ansible/executor/module_common.py#L175
    * The code we would have to maintain for this looks pretty clean.
      In the wrapper we create a ModuleType, set __file__ on it, read
      the module's contents in from the zip file and then exec it.
    * Drawbacks: We still have to explicitly extract the file's contents
      from the zip archive instead of letting python's import mechanism
      handle it.
    * Exec also has hidden performance issues and breaks certain
      assumptions that modules could be making about their own code:
      http://lucumr.pocoo.org/2011/2/1/exec-in-python/

  Our plan is to use imp.load_module() for now, deprecate the use of
  __file__ in modules, and switch to zipimport once the deprecation
  period for __file__ is over (without monkeypatching a fake __file__ in
  via AnsibleModule).

* Rename the name of the AnsiBallZ wrapped module
  This makes it obvious that the wrapped module isn't the module file that
  we distribute.  It's part of trying to mitigate the fact that the module
  is now named __main)).py in tracebacks.

* Shield all wrapper symbols inside of a function
  With the new import code, all symbols in the wrapper become visible in
  the module.  To mitigate the chance of collisions, move most symbols
  into a toplevel function.  The only symbols left in the global namespace
  are now _ANSIBALLZ_WRAPPER and _ansiballz_main.

revised porting guide entry

Integrate code coverage collection into AnsiballZ.

ci_coverage
ci_complete
2018-07-26 20:07:25 -07:00
.github Add botmeta entry for ansible-connection (#43290) 2018-07-26 10:11:13 +05:30
bin Support setting persistent command timeout per task basis (#42847) 2018-07-20 10:04:53 +05:30
changelogs AnsiballZ improvements 2018-07-26 20:07:25 -07:00
contrib scaleway: initialise auth_token to none (#43183) 2018-07-24 12:40:17 +05:30
docs AnsiballZ improvements 2018-07-26 20:07:25 -07:00
examples Fix some broken links (#42079) 2018-06-29 11:12:01 -07:00
hacking AnsiballZ improvements 2018-07-26 20:07:25 -07:00
lib/ansible AnsiballZ improvements 2018-07-26 20:07:25 -07:00
licenses Create a short license for PSF and MIT. (#32212) 2017-11-06 10:25:30 -08:00
packaging Fix azure_rm_keyvaultkey/azure_rm_keyvaultsecret bugs (#41683) 2018-07-23 11:49:30 +08:00
test AnsiballZ improvements 2018-07-26 20:07:25 -07:00
.cherry_picker.toml 🚸 🐍 🍒 ⛏ Integrate cherry picker (#41403) 2018-07-12 19:34:02 +03:00
.coveragerc AnsiballZ improvements 2018-07-26 20:07:25 -07:00
.gitattributes 2.6 changelog gen/version/root dir cleanup (#40421) 2018-05-21 16:14:53 -07:00
.gitignore Implement new changelog generator. 2018-06-05 19:08:15 -07:00
.mailmap Fix syntax typo 2017-12-24 12:16:17 +01:00
CODING_GUIDELINES.md Fix some broken links (#42079) 2018-06-29 11:12:01 -07:00
COPYING
docsite_requirements.txt Fixes the build issue pertaining to sphinx-build which is required to build ansible (#22480) 2017-03-14 14:19:46 -07:00
Makefile Fix some broken links (#42079) 2018-06-29 11:12:01 -07:00
MANIFEST.in fix MANIFEST.in to include CHANGELOG stub for devel 2018-05-30 17:40:50 -07:00
MODULE_GUIDELINES.md Use https for links to ansible.com domains. 2018-04-23 11:33:56 -07:00
README.rst 2.6 changelog gen/version/root dir cleanup (#40421) 2018-05-21 16:14:53 -07:00
requirements.txt Cyptography pr 20566 rebase (#25560) 2017-06-27 06:00:15 -07:00
setup.py Add CoC and mailing lists links to PYPI 2018-06-30 22:55:50 +03:00
shippable.yml Update Shippable integration test groups. (#43118) 2018-07-23 20:46:22 -07:00
tox.ini Convert ansible-test compile into a sanity test. 2018-01-25 09:45:36 -08:00

README.rst

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Ansible

Ansible is a radically simple IT automation system. It handles configuration-management, application deployment, cloud provisioning, ad-hoc task-execution, and multinode orchestration -- including trivializing things like zero-downtime rolling updates with load balancers.

Read the documentation and more at https://ansible.com/

You can find installation instructions here for a variety of platforms.

Most users should probably install a released version of Ansible from pip, a package manager or our release repository. Officially supported builds of Ansible are also available. Some power users run directly from the development branch - while significant efforts are made to ensure that devel is reasonably stable, you're more likely to encounter breaking changes when running Ansible this way.

Design Principles

  • Have a dead simple setup process and a minimal learning curve
  • Manage machines very quickly and in parallel
  • Avoid custom-agents and additional open ports, be agentless by leveraging the existing SSH daemon
  • Describe infrastructure in a language that is both machine and human friendly
  • Focus on security and easy auditability/review/rewriting of content
  • Manage new remote machines instantly, without bootstrapping any software
  • Allow module development in any dynamic language, not just Python
  • Be usable as non-root
  • Be the easiest IT automation system to use, ever.

Get Involved

  • Read Community Information for all kinds of ways to contribute to and interact with the project, including mailing list information and how to submit bug reports and code to Ansible.
  • All code submissions are done through pull requests. Take care to make sure no merge commits are in the submission, and use git rebase vs git merge for this reason. If submitting a large code change (other than modules), it's probably a good idea to join ansible-devel and talk about what you would like to do or add first to avoid duplicate efforts. This not only helps everyone know what's going on, it also helps save time and effort if we decide some changes are needed.
  • Users list: ansible-project
  • Development list: ansible-devel
  • Announcement list: ansible-announce -- read only
  • irc.freenode.net: #ansible

Branch Info

  • Releases are named after Led Zeppelin songs. (Releases prior to 2.0 were named after Van Halen songs.)
  • The devel branch corresponds to the release actively under development.
  • Various release-X.Y branches exist for previous releases.
  • We'd love to have your contributions, read Community Information for notes on how to get started.

Roadmap

Based on team and community feedback, an initial roadmap will be published for a major or minor version (ex: 2.0, 2.1). Subminor versions will generally not have roadmaps published.

Ansible 2.1 was the first release which published this and asked for feedback in this manner. Feedback on the roadmap and the new process is quite welcome. The team is aiming for further transparency and better inclusion of both community desires and submissions.

These are the team's best guess roadmaps based on the Ansible team's experience and are also based on requests and feedback from the community. There are things that may not make it due to time constraints, lack of community maintainers, etc. Each roadmap is published both as an idea of what is upcoming in Ansible, and as a medium for seeking further feedback from the community.

There are multiple places for you to submit feedback:

  • Add to the agenda of an IRC Core Team Meeting (preferred)
  • Ansible's google-group: ansible-devel
  • AnsibleFest conferences
  • IRC Freenode channel: #ansible-devel (this one may have things lost in lots of conversation)

For additional details consult the published Ansible Roadmap.

Authors

Ansible was created by Michael DeHaan (michael.dehaan/gmail/com) and has contributions from over 1000 users (and growing). Thanks everyone!

Ansible is sponsored by Ansible, Inc

License

GNU General Public License v3.0

See COPYING to see the full text.