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.. _changelog:
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Release Notes
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=============
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.. raw:: html
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<style>
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div#release-notes h2 {
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border-bottom: 1px dotted #c0c0c0;
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margin-top: 40px;
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}
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</style>
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.. _known_issues:
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Known Issues
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------------
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Mitogen For Ansible
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~~~~~~~~~~~~~~~~~~~
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* The Ansible 2.7 `reboot
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<https://docs.ansible.com/ansible/latest/modules/reboot_module.html>`_ module
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may require a ``pre_reboot_delay`` on systemd hosts, as insufficient time
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exists for the reboot command's exit status to be reported before necessary
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processes are torn down.
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* On OS X when a SSH password is specified and the default connection type of
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``smart`` is used, Ansible may select the Paramiko plug-in rather than
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Mitogen. If you specify a password on OS X, ensure ``connection: ssh``
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appears in your playbook, ``ansible.cfg``, or as ``-c ssh`` on the
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command-line.
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* The ``raw`` action executes as a regular Mitogen connection, which requires
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Python on the target, precluding its use for installing Python. This will be
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addressed in a future 0.2 release. For now, simply mix Mitogen and vanilla
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Ansible strategies in your playbook:
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.. code-block:: yaml
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- hosts: web-servers
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strategy: linear
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tasks:
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- name: Install Python if necessary.
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raw: test -e /usr/bin/python || apt install -y python-minimal
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- hosts: web-servers
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strategy: mitogen_linear
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roles:
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- nginx
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- initech_app
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- y2k_fix
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.. * When running with ``-vvv``, log messages will be printed to the console
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*after* the Ansible run completes, as connection multiplexer shutdown only
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begins after Ansible exits. This is due to a lack of suitable shutdown hook
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in Ansible, and is fairly harmless, albeit cosmetically annoying. A future
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release may include a solution.
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.. * Configurations will break that rely on the `hashbang argument splitting
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behaviour <https://github.com/ansible/ansible/issues/15635>`_ of the
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``ansible_python_interpreter`` setting, contrary to the Ansible
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documentation. This will be addressed in a future 0.2 release.
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* Performance does not scale linearly with target count. This requires
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significant additional work, as major bottlenecks exist in the surrounding
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Ansible code. Performance-related bug reports for any scenario remain
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welcome with open arms.
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* Performance on Python 3 is significantly worse than on Python 2. While this
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has not yet been investigated, at least some of the regression appears to be
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part of the core library, and should therefore be straightforward to fix as
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part of 0.2.x.
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* *Module Replacer* style Ansible modules are not supported.
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* Actions are single-threaded for each `(host, user account)` combination,
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including actions that execute on the local machine. Playbooks may experience
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slowdown compared to vanilla Ansible if they employ long-running
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``local_action`` or ``delegate_to`` tasks delegating many target hosts to a
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single machine and user account.
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* Connection Delegation remains in preview and has bugs around how it infers
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connections. Connection establishment will remain single-threaded for the 0.2
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series, however connection inference bugs will be addressed in a future 0.2
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release.
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* Connection Delegation does not support automatic tunnelling of SSH-dependent
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actions, such as the ``synchronize`` module. This will be addressed in the
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0.3 series.
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Core Library
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~~~~~~~~~~~~
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* Serialization is still based on :mod:`pickle`. While there is high confidence
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remote code execution is impossible in Mitogen's configuration, an untrusted
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context may at least trigger disproportionately high memory usage injecting
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small messages (*"billion laughs attack"*). Replacement is an important
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future priority, but not critical for an initial release.
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* Child processes are not reliably reaped, leading to a pileup of zombie
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processes when a program makes many short-lived connections in a single
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invocation. This does not impact Mitogen for Ansible, however it limits the
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usefulness of the core library. A future 0.2 release will address it.
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* Some races remain around :class:`mitogen.core.Broker <Broker>` destruction,
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disconnection and corresponding file descriptor closure. These are only
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problematic in situations where child process reaping is also problematic.
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* The `fakessh` component does not shut down correctly and requires flow
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control added to the design. While minimal fixes are possible, due to the
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absence of flow control the original design is functionally incomplete.
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* The multi-threaded :ref:`service` remains in a state of design flux and
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should be considered obsolete, despite heavy use in Mitogen for Ansible. A
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future replacement may be integrated more tightly with, or entirely replace
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the RPC dispatcher on the main thread.
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* Documentation is in a state of disrepair. This will be improved over the 0.2
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series.
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v0.2.4 (2018-??-??)
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-------------------
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Mitogen for Ansible
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~~~~~~~~~~~~~~~~~~~
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Enhancements
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^^^^^^^^^^^^
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* `#76 <https://github.com/dw/mitogen/issues/76>`_,
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`#351 <https://github.com/dw/mitogen/issues/351>`_,
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`#352 <https://github.com/dw/mitogen/issues/352>`_: disconnect propagation
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has improved, allowing Ansible to cancel waits for responses from abruptly
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disconnected targets. This ensures a task will gracefully fail rather than
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hang, for example on network failure or EC2 instance maintenance.
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* `#369 <https://github.com/dw/mitogen/issues/369>`_,
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`#407 <https://github.com/dw/mitogen/issues/407>`_: :meth:`Connection.reset`
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is implemented, allowing `meta: reset_connection
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<https://docs.ansible.com/ansible/latest/modules/meta_module.html>`_ to shut
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down the remote interpreter as documented, and improving support for the
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`reboot
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<https://docs.ansible.com/ansible/latest/modules/reboot_module.html>`_
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module.
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* `09aa27a6 <https://github.com/dw/mitogen/commit/09aa27a6>`_: the
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``mitogen_host_pinned`` strategy wraps the ``host_pinned`` strategy
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introduced in Ansible 2.7.
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* `#412 <https://github.com/dw/mitogen/issues/412>`_: to simplify diagnosing
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issues with connection configuration, Mitogen ships with a
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``mitogen_get_stack`` action that is automatically added to the action
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plug-in path. See :ref:`mitogen-get-stack` for more information.
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* `#415 <https://github.com/dw/mitogen/issues/415>`_,
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`#493 <https://github.com/dw/mitogen/issues/493>`_: the interface employed
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for in-process queues changed from `kqueue
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<https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2>`_ / `epoll
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<http://man7.org/linux/man-pages/man7/epoll.7.html>`_ to `poll()
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<http://man7.org/linux/man-pages/man2/poll.2.html>`_, which requires no setup
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or teardown, yielding a 38% latency reduction for inter-thread communication.
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This may manifest as a runtime improvement in many-host runs.
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* `#477 <https://github.com/dw/mitogen/issues/477>`_: Python 2.4 is fully
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supported by the core library and tested automatically, in any parent/child
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combination of 2.4, 2.6, 2.7 and 3.6 interpreters.
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* `#477 <https://github.com/dw/mitogen/issues/477>`_: Ansible 2.3 is fully
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supported and tested automatically. In combination with the core library
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Python 2.4 support, this allows Red Hat Enterprise Linux 5 targets to be
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managed with Mitogen. The ``simplejson`` package need not be installed on
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such targets, as is usually required by Ansible.
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Fixes
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^^^^^
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* `#251 <https://github.com/dw/mitogen/issues/251>`_,
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`#359 <https://github.com/dw/mitogen/issues/359>`_,
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`#396 <https://github.com/dw/mitogen/issues/396>`_,
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`#401 <https://github.com/dw/mitogen/issues/401>`_,
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`#404 <https://github.com/dw/mitogen/issues/404>`_,
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`#412 <https://github.com/dw/mitogen/issues/412>`_,
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`#434 <https://github.com/dw/mitogen/issues/434>`_,
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`#436 <https://github.com/dw/mitogen/issues/436>`_,
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`#465 <https://github.com/dw/mitogen/issues/465>`_: connection delegation and
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``delegate_to:`` handling suffered a major regression in 0.2.3. The 0.2.2
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behaviour has been restored, and further work has been made to improve the
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compatibility of connection delegation's configuration building methods.
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* `#323 <https://github.com/dw/mitogen/issues/323>`_,
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`#333 <https://github.com/dw/mitogen/issues/333>`_: work around a Windows
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Subsystem for Linux bug that caused tracebacks to appear during shutdown.
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* `#334 <https://github.com/dw/mitogen/issues/334>`_: the SSH method
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tilde-expands private key paths using Ansible's logic. Previously the path
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was passed unmodified to SSH, which expanded it using :func:`pwd.getpwnam`.
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This differs from :func:`os.path.expanduser`, which uses the ``HOME``
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environment variable if it is set, causing behaviour to diverge when Ansible
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was invoked across user accounts via ``sudo``.
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* `#364 <https://github.com/dw/mitogen/issues/364>`_: file transfers from
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controllers running Python 2.7.2 or earlier could be interrupted due to a
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forking bug in the :mod:`tempfile` module.
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* `#370 <https://github.com/dw/mitogen/issues/370>`_: the Ansible
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`reboot <https://docs.ansible.com/ansible/latest/modules/reboot_module.html>`_
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module is supported.
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* `#373 <https://github.com/dw/mitogen/issues/373>`_: the LXC and LXD methods
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print a useful hint on failure, as no useful error is normally logged to the
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console by these tools.
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* `#374 <https://github.com/dw/mitogen/issues/374>`_,
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`#391 <https://github.com/dw/mitogen/issues/391>`_: file transfer and module
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execution from 2.x controllers to 3.x targets was broken due to a regression
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caused by refactoring, and compounded by `#426
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<https://github.com/dw/mitogen/issues/426>`_.
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* `#400 <https://github.com/dw/mitogen/issues/400>`_: work around a threading
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bug in the AWX display callback when running with high verbosity setting.
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* `#409 <https://github.com/dw/mitogen/issues/409>`_: the setns method was
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silently broken due to missing tests. Basic coverage was added to prevent a
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recurrence.
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* `#409 <https://github.com/dw/mitogen/issues/409>`_: the LXC and LXD methods
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support ``mitogen_lxc_path`` and ``mitogen_lxc_attach_path`` variables to
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control the location of third pary utilities.
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* `#410 <https://github.com/dw/mitogen/issues/410>`_: the sudo method supports
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the SELinux ``--type`` and ``--role`` options.
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* `#420 <https://github.com/dw/mitogen/issues/420>`_: if a :class:`Connection`
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was constructed in the Ansible top-level process, for example while executing
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``meta: reset_connection``, resources could become undesirably shared in
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subsequent children.
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* `#426 <https://github.com/dw/mitogen/issues/426>`_: an oversight while
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porting to Python 3 meant no automated 2->3 tests were running. A significant
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number of 2->3 bugs were fixed, mostly in the form of Unicode/bytes
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mismatches.
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* `#362 <https://github.com/dw/mitogen/issues/362>`_,
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`#435 <https://github.com/dw/mitogen/issues/435>`_: the previous fix for slow
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Python 2.x subprocess creation on Red Hat caused newly spawned children to
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have a reduced open files limit. A more intrusive fix has been added to
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directly address the problem without modifying the subprocess environment.
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* `#397 <https://github.com/dw/mitogen/issues/397>`_,
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`#454 <https://github.com/dw/mitogen/issues/454>`_: the previous approach to
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handling modern Ansible temporary file cleanup was too aggressive, and could
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trigger early finalization of Cython-based extension modules, leading to
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segmentation faults.
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* `#499 <https://github.com/dw/mitogen/issues/499>`_: the ``allow_same_user``
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Ansible configuration setting is respected.
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* `dc1d4251 <https://github.com/dw/mitogen/commit/dc1d4251>`_: the
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``synchronize`` module could fail with the Docker transport due to a missing
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attribute.
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* `599da068 <https://github.com/dw/mitogen/commit/599da068>`_: fix a race
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when starting async tasks, where it was possible for the controller to
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observe no status file on disk before the task had a chance to write one.
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Core Library
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~~~~~~~~~~~~
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* `#76 <https://github.com/dw/mitogen/issues/76>`_: routing records the
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destination context IDs ever received on each stream, and when disconnection
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occurs, propagates :data:`mitogen.core.DEL_ROUTE` messages towards every
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stream that ever communicated with the disappearing peer, rather than simply
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towards parents. Conversations between nodes anywhere in the tree receive
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:data:`mitogen.core.DEL_ROUTE` when either participant disconnects, allowing
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receivers to wake with :class:`mitogen.core.ChannelError`, even when one
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participant is not a parent of the other.
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* `#109 <https://github.com/dw/mitogen/issues/109>`_,
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`57504ba6 <https://github.com/dw/mitogen/commit/57504ba6>`_: newer Python 3
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releases explicitly populate :data:`sys.meta_path` with importer internals,
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causing Mitogen to install itself at the end of the importer chain rather
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than the front.
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* `#310 <https://github.com/dw/mitogen/issues/310>`_: support has returned for
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trying to figure out the real source of non-module objects installed in
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:data:`sys.modules`, so they can be imported. This is needed to handle syntax
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sugar used by packages like :mod:`plumbum`.
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* `#349 <https://github.com/dw/mitogen/issues/349>`_: an incorrect format
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string could cause large stack traces when attempting to import built-in
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modules on Python 3.
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* `#387 <https://github.com/dw/mitogen/issues/387>`_,
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`#413 <https://github.com/dw/mitogen/issues/413>`_: dead messages include an
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optional reason in their body. This is used to cause
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:class:`mitogen.core.ChannelError` to report far more useful diagnostics at
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the point the error occurs that previously would have been buried in debug
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log output from an unrelated context.
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* `#408 <https://github.com/dw/mitogen/issues/408>`_: a variety of fixes were
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made to restore Python 2.4 compatibility.
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* `#399 <https://github.com/dw/mitogen/issues/399>`_,
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`#437 <https://github.com/dw/mitogen/issues/437>`_: ignore a
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:class:`DeprecationWarning` to avoid failure of the ``su`` method on Python
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3.7.
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* `#405 <https://github.com/dw/mitogen/issues/405>`_: if an oversized message
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is rejected, and it has a ``reply_to`` set, a dead message is returned to the
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sender. This ensures function calls exceeding the configured maximum size
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crash rather than hang.
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* `#406 <https://github.com/dw/mitogen/issues/406>`_:
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:class:`mitogen.core.Broker` did not call :meth:`mitogen.core.Poller.close`
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during shutdown, leaking the underlying poller FD in masters and parents.
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* `#406 <https://github.com/dw/mitogen/issues/406>`_: connections could leak
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FDs when a child process failed to start.
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* `#288 <https://github.com/dw/mitogen/issues/288>`_,
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`#406 <https://github.com/dw/mitogen/issues/406>`_,
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`#417 <https://github.com/dw/mitogen/issues/417>`_: connections could leave
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FD wrapper objects that had not been closed lying around to be closed during
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garbage collection, causing reused FD numbers to be closed at random moments.
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* `#411 <https://github.com/dw/mitogen/issues/411>`_: the SSH method typed
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"``y``" rather than the requisite "``yes``" when `check_host_keys="accept"`
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was configured. This would lead to connection timeouts due to the hung
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response.
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* `#414 <https://github.com/dw/mitogen/issues/414>`_,
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`#425 <https://github.com/dw/mitogen/issues/425>`_: avoid deadlock of forked
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children by reinitializing the :mod:`mitogen.service` pool lock.
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* `#416 <https://github.com/dw/mitogen/issues/416>`_: around 1.4KiB of memory
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was leaked on every RPC, due to a list of strong references keeping alive any
|
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handler ever registered for disconnect notification.
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* `#418 <https://github.com/dw/mitogen/issues/418>`_: the
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:func:`mitogen.parent.iter_read` helper would leak poller FDs, because
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execution of its :keyword:`finally` block was delayed on Python 3. Now
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callers explicitly close the generator when finished.
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* `#422 <https://github.com/dw/mitogen/issues/422>`_: the fork method could
|
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fail to start if :data:`sys.stdout` was opened in block buffered mode, and
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buffered data was pending in the parent prior to fork.
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* `#438 <https://github.com/dw/mitogen/issues/438>`_: a descriptive error is
|
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logged when stream corruption is detected.
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* `#439 <https://github.com/dw/mitogen/issues/439>`_: descriptive errors are
|
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raised when attempting to invoke unsupported function types.
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* `#444 <https://github.com/dw/mitogen/issues/444>`_: messages regarding
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unforwardable extension module are no longer logged as errors.
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* `#445 <https://github.com/dw/mitogen/issues/445>`_: service pools unregister
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the :data:`mitogen.core.CALL_SERVICE` handle at shutdown, ensuring any
|
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outstanding messages are either processed by the pool as it shuts down, or
|
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have dead messages sent in reply to them, preventing peer contexts from
|
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hanging due to a forgotten buffered message.
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* `#446 <https://github.com/dw/mitogen/issues/446>`_: given thread A calling
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:meth:`mitogen.core.Receiver.close`, and thread B, C, and D sleeping in
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:meth:`mitogen.core.Receiver.get`, previously only one sleeping thread would
|
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be woken with :class:`mitogen.core.ChannelError` when the receiver was
|
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closed. Now all threads are woken per the docstring.
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* `#447 <https://github.com/dw/mitogen/issues/447>`_: duplicate attempts to
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invoke :meth:`mitogen.core.Router.add_handler` cause an error to be raised,
|
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ensuring accidental re-registration of service pools are reported correctly.
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* `#448 <https://github.com/dw/mitogen/issues/448>`_: the import hook
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implementation now raises :class:`ModuleNotFoundError` instead of
|
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:class:`ImportError` in Python 3.6 and above, to cope with an upcoming
|
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version of the :mod:`subprocess` module requiring this new subclass to be
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raised.
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* `#453 <https://github.com/dw/mitogen/issues/453>`_: the loggers used in
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children for standard IO redirection have propagation disabled, preventing
|
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accidental reconfiguration of the :mod:`logging` package in a child from
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setting up a feedback loop.
|
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* `#456 <https://github.com/dw/mitogen/issues/456>`_: a descriptive error is
|
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logged when :meth:`mitogen.core.Broker.defer` is called after the broker has
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shut down, preventing new messages being enqueued that will never be sent,
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and subsequently producing a program hang.
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* `#459 <https://github.com/dw/mitogen/issues/459>`_: the beginnings of a
|
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:meth:`mitogen.master.Router.get_stats` call has been added. The initial
|
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statistics cover the module loader only.
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* `#462 <https://github.com/dw/mitogen/issues/462>`_: Mitogen could fail to
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open a PTY on broken Linux systems due to a bad interaction between the glibc
|
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:func:`grantpt` function and an incorrectly mounted ``/dev/pts`` filesystem.
|
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Since correct group ownership is not required in most scenarios, when this
|
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problem is detected, the PTY is allocated and opened directly by the library.
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* `#479 <https://github.com/dw/mitogen/issues/479>`_: Mitogen could fail to
|
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import :mod:`__main__` on Python 3.4 and newer due to a breaking change in
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the :mod:`pkgutil` API. The program's main script is now handled specially.
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* `16ca111e <https://github.com/dw/mitogen/commit/16ca111e>`_: handle OpenSSH
|
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7.5 permission denied prompts when ``~/.ssh/config`` rewrites are present.
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* `9ec360c2 <https://github.com/dw/mitogen/commit/9ec360c2>`_: a new
|
|
:meth:`mitogen.core.Broker.defer_sync` utility function is provided.
|
|
|
|
* `f20e0bba <https://github.com/dw/mitogen/commit/f20e0bba>`_:
|
|
:meth:`mitogen.service.FileService.register_prefix` permits granting
|
|
unprivileged access to whole filesystem subtrees, rather than single files at
|
|
a time.
|
|
|
|
* `8f85ee03 <https://github.com/dw/mitogen/commit/8f85ee03>`_:
|
|
:meth:`mitogen.core.Router.myself` returns a :class:`mitogen.core.Context`
|
|
referring to the current process.
|
|
|
|
* `824c7931 <https://github.com/dw/mitogen/commit/824c7931>`_: exceptions
|
|
raised by the import hook were updated to include probable reasons for
|
|
a failure.
|
|
|
|
* `57b652ed <https://github.com/dw/mitogen/commit/57b652ed>`_: a stray import
|
|
meant an extra roundtrip and ~20KiB of data was wasted for any context that
|
|
imported :mod:`mitogen.parent`.
|
|
|
|
|
|
Thanks!
|
|
~~~~~~~
|
|
|
|
Mitogen would not be possible without the support of users. A huge thanks for
|
|
bug reports, testing, features and fixes in this release contributed by
|
|
`Andreas Krüger <https://github.com/woopstar>`_,
|
|
`Anton Stroganov <https://github.com/Aeon>`_,
|
|
`Berend De Schouwer <https://github.com/berenddeschouwer>`_,
|
|
`Brian Candler <https://github.com/candlerb>`_,
|
|
`dsgnr <https://github.com/dsgnr>`_,
|
|
`Duane Zamrok <https://github.com/dewthefifth>`_,
|
|
`Eric Chang <https://github.com/changchichung>`_,
|
|
`Gerben Meijer <https://github.com/infernix>`_,
|
|
`Guy Knights <https://github.com/knightsg>`_,
|
|
`Jesse London <https://github.com/jesteria>`_,
|
|
`Jiří Vávra <https://github.com/Houbovo>`_,
|
|
`Johan Beisser <https://github.com/jbeisser>`_,
|
|
`Jonathan Rosser <https://github.com/jrosser>`_,
|
|
`Josh Smift <https://github.com/jbscare>`_,
|
|
`Mehdi <https://github.com/mehdisat7>`_,
|
|
`Michael DeHaan <https://github.com/mpdehaan>`_,
|
|
`Michal Medvecky <https://github.com/michalmedvecky>`_,
|
|
`Mohammed Naser <https://github.com/mnaser/>`_,
|
|
`Peter V. Saveliev <https://github.com/svinota/>`_,
|
|
`Pieter Avonts <https://github.com/pieteravonts/>`_,
|
|
`Ross Williams <https://github.com/overhacked/>`_,
|
|
`Sergey <https://github.com/LuckySB/>`_,
|
|
`Stéphane <https://github.com/sboisson/>`_,
|
|
`Strahinja Kustudic <https://github.com/kustodian>`_,
|
|
`Tom Parker-Shemilt <https://github.com/palfrey/>`_,
|
|
`Younès HAFRI <https://github.com/yhafri>`_,
|
|
`@myssa91 <https://github.com/myssa91>`_,
|
|
`@s3c70r <https://github.com/s3c70r/>`_,
|
|
`@syntonym <https://github.com/syntonym/>`_,
|
|
`@trim777 <https://github.com/trim777/>`_,
|
|
`@whky <https://github.com/whky/>`_, and
|
|
`@yodatak <https://github.com/yodatak/>`_.
|
|
|
|
|
|
v0.2.3 (2018-10-23)
|
|
-------------------
|
|
|
|
Mitogen for Ansible
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
Enhancements
|
|
^^^^^^^^^^^^
|
|
|
|
* `#315 <https://github.com/dw/mitogen/pull/315>`_,
|
|
`#392 <https://github.com/dw/mitogen/issues/392>`_: Ansible 2.6 and 2.7 are
|
|
supported.
|
|
|
|
* `#321 <https://github.com/dw/mitogen/issues/321>`_,
|
|
`#336 <https://github.com/dw/mitogen/issues/336>`_: temporary file handling
|
|
was simplified, undoing earlier damage caused by compatibility fixes,
|
|
improving 2.6 compatibility, and avoiding two network roundtrips for every
|
|
related action
|
|
(`assemble <http://docs.ansible.com/ansible/latest/modules/assemble_module.html>`_,
|
|
`aws_s3 <http://docs.ansible.com/ansible/latest/modules/aws_s3_module.html>`_,
|
|
`copy <http://docs.ansible.com/ansible/latest/modules/copy_module.html>`_,
|
|
`patch <http://docs.ansible.com/ansible/latest/modules/patch_module.html>`_,
|
|
`script <http://docs.ansible.com/ansible/latest/modules/script_module.html>`_,
|
|
`template <http://docs.ansible.com/ansible/latest/modules/template_module.html>`_,
|
|
`unarchive <http://docs.ansible.com/ansible/latest/modules/unarchive_module.html>`_,
|
|
`uri <http://docs.ansible.com/ansible/latest/modules/uri_module.html>`_). See
|
|
:ref:`ansible_tempfiles` for a complete description.
|
|
|
|
* `#376 <https://github.com/dw/mitogen/pull/376>`_,
|
|
`#377 <https://github.com/dw/mitogen/pull/377>`_: the ``kubectl`` connection
|
|
type is now supported. Contributed by Yannig Perré.
|
|
|
|
* `084c0ac0 <https://github.com/dw/mitogen/commit/084c0ac0>`_: avoid a
|
|
roundtrip in
|
|
`copy <http://docs.ansible.com/ansible/latest/modules/copy_module.html>`_ and
|
|
`template <http://docs.ansible.com/ansible/latest/modules/template_module.html>`_
|
|
due to an unfortunate default.
|
|
|
|
* `7458dfae <https://github.com/dw/mitogen/commit/7458dfae>`_: avoid a
|
|
roundtrip when transferring files smaller than 124KiB. Copy and template
|
|
actions are now 2-RTT, reducing runtime for a 20-iteration template loop over
|
|
a 250 ms link from 30 seconds to 10 seconds compared to v0.2.2, down from 120
|
|
seconds compared to vanilla.
|
|
|
|
* `#337 <https://github.com/dw/mitogen/issues/337>`_: To avoid a scaling
|
|
limitation, a PTY is no longer allocated for an SSH connection unless the
|
|
configuration specifies a password.
|
|
|
|
* `d62e6e2a <https://github.com/dw/mitogen/commit/d62e6e2a>`_: many-target
|
|
runs executed the dependency scanner redundantly due to missing
|
|
synchronization, wasting significant runtime in the connection multiplexer.
|
|
In one case work was reduced by 95%, which may manifest as faster runs.
|
|
|
|
* `5189408e <https://github.com/dw/mitogen/commit/5189408e>`_: threads are
|
|
cooperatively scheduled, minimizing `GIL
|
|
<https://en.wikipedia.org/wiki/Global_interpreter_lock>`_ contention, and
|
|
reducing context switching by around 90%. This manifests as an overall
|
|
improvement, but is easily noticeable on short many-target runs, where
|
|
startup overhead dominates runtime.
|
|
|
|
* The `faulthandler <https://faulthandler.readthedocs.io/>`_ module is
|
|
automatically activated if it is installed, simplifying debugging of hangs.
|
|
See :ref:`diagnosing-hangs` for details.
|
|
|
|
* The ``MITOGEN_DUMP_THREAD_STACKS`` environment variable's value now indicates
|
|
the number of seconds between stack dumps. See :ref:`diagnosing-hangs` for
|
|
details.
|
|
|
|
|
|
Fixes
|
|
^^^^^
|
|
|
|
* `#251 <https://github.com/dw/mitogen/issues/251>`_,
|
|
`#340 <https://github.com/dw/mitogen/issues/340>`_: Connection Delegation
|
|
could establish connections to the wrong target when ``delegate_to:`` is
|
|
present.
|
|
|
|
* `#291 <https://github.com/dw/mitogen/issues/291>`_: when Mitogen had
|
|
previously been installed using ``pip`` or ``setuptools``, the globally
|
|
installed version could conflict with a newer version bundled with an
|
|
extension that had been installed using the documented steps. Now the bundled
|
|
library always overrides over any system-installed copy.
|
|
|
|
* `#324 <https://github.com/dw/mitogen/issues/324>`_: plays with a
|
|
`custom module_utils <https://docs.ansible.com/ansible/latest/reference_appendices/config.html#default-module-utils-path>`_
|
|
would fail due to fallout from the Python 3 port and related tests being
|
|
disabled.
|
|
|
|
* `#331 <https://github.com/dw/mitogen/issues/331>`_: the connection
|
|
multiplexer subprocess always exits before the main Ansible process, ensuring
|
|
logs generated by it do not overwrite the user's prompt when ``-vvv`` is
|
|
enabled.
|
|
|
|
* `#332 <https://github.com/dw/mitogen/issues/332>`_: support a new
|
|
:func:`sys.excepthook`-based module exit mechanism added in Ansible 2.6.
|
|
|
|
* `#338 <https://github.com/dw/mitogen/issues/338>`_: compatibility: changes to
|
|
``/etc/environment`` and ``~/.pam_environment`` made by a task are reflected
|
|
in the runtime environment of subsequent tasks. See
|
|
:ref:`ansible_process_env` for a complete description.
|
|
|
|
* `#343 <https://github.com/dw/mitogen/issues/343>`_: the sudo ``--login``
|
|
option is supported.
|
|
|
|
* `#344 <https://github.com/dw/mitogen/issues/344>`_: connections no longer
|
|
fail when the controller's login username contains slashes.
|
|
|
|
* `#345 <https://github.com/dw/mitogen/issues/345>`_: the ``IdentitiesOnly
|
|
yes`` option is no longer supplied to OpenSSH by default, better matching
|
|
Ansible's behaviour.
|
|
|
|
* `#355 <https://github.com/dw/mitogen/issues/355>`_: tasks configured to run
|
|
in an isolated forked subprocess were forked from the wrong parent context.
|
|
This meant built-in modules overridden via a custom ``module_utils`` search
|
|
path may not have had any effect.
|
|
|
|
* `#362 <https://github.com/dw/mitogen/issues/362>`_: to work around a slow
|
|
algorithm in the :mod:`subprocess` module, the maximum number of open files
|
|
in processes running on the target is capped to 512, reducing the work
|
|
required to start a subprocess by >2000x in default CentOS configurations.
|
|
|
|
* `#397 <https://github.com/dw/mitogen/issues/397>`_: recent Mitogen master
|
|
versions could fail to clean up temporary directories in a number of
|
|
circumstances, and newer Ansibles moved to using :mod:`atexit` to effect
|
|
temporary directory cleanup in some circumstances.
|
|
|
|
* `b9112a9c <https://github.com/dw/mitogen/commit/b9112a9c>`_,
|
|
`2c287801 <https://github.com/dw/mitogen/commit/2c287801>`_: OpenSSH 7.5
|
|
permission denied prompts are now recognized. Contributed by Alex Willmer.
|
|
|
|
* A missing check caused an exception traceback to appear when using the
|
|
``ansible`` command-line tool with a missing or misspelled module name.
|
|
|
|
* Ansible since >=2.7 began importing :mod:`__main__` from
|
|
:mod:`ansible.module_utils.basic`, causing an error during execution, due to
|
|
the controller being configured to refuse network imports outside the
|
|
``ansible.*`` namespace. Update the target implementation to construct a stub
|
|
:mod:`__main__` module to satisfy the otherwise seemingly vestigial import.
|
|
|
|
|
|
Core Library
|
|
~~~~~~~~~~~~
|
|
|
|
* A new :class:`mitogen.parent.CallChain` class abstracts safe pipelining of
|
|
related function calls to a target context, cancelling the chain if an
|
|
exception occurs.
|
|
|
|
* `#305 <https://github.com/dw/mitogen/issues/305>`_: fix a long-standing minor
|
|
race relating to the logging framework, where *no route for Message..*
|
|
would frequently appear during startup.
|
|
|
|
* `#313 <https://github.com/dw/mitogen/issues/313>`_:
|
|
:meth:`mitogen.parent.Context.call` was documented as capable of accepting
|
|
static methods. While possible on Python 2.x the result is ugly, and in every
|
|
case it should be trivial to replace with a classmethod. The documentation
|
|
was fixed.
|
|
|
|
* `#337 <https://github.com/dw/mitogen/issues/337>`_: to avoid a scaling
|
|
limitation, a PTY is no longer allocated for each OpenSSH client if it can be
|
|
avoided. PTYs are only allocated if a password is supplied, or when
|
|
`host_key_checking=accept`. This is since Linux has a default of 4096 PTYs
|
|
(``kernel.pty.max``), while OS X has a default of 127 and an absolute maximum
|
|
of 999 (``kern.tty.ptmx_max``).
|
|
|
|
* `#339 <https://github.com/dw/mitogen/issues/339>`_: the LXD connection method
|
|
was erroneously executing LXC Classic commands.
|
|
|
|
* `#345 <https://github.com/dw/mitogen/issues/345>`_: the SSH connection method
|
|
allows optionally disabling ``IdentitiesOnly yes``.
|
|
|
|
* `#356 <https://github.com/dw/mitogen/issues/356>`_: if the master Python
|
|
process does not have :data:`sys.executable` set, the default Python
|
|
interpreter used for new children on the local machine defaults to
|
|
``"/usr/bin/python"``.
|
|
|
|
* `#366 <https://github.com/dw/mitogen/issues/366>`_,
|
|
`#380 <https://github.com/dw/mitogen/issues/380>`_: attempts by children to
|
|
import :mod:`__main__` where the main program module lacks an execution guard
|
|
are refused, and an error is logged. This prevents a common and highly
|
|
confusing error when prototyping new scripts.
|
|
|
|
* `#371 <https://github.com/dw/mitogen/pull/371>`_: the LXC connection method
|
|
uses a more compatible method to establish an non-interactive session.
|
|
Contributed by Brian Candler.
|
|
|
|
* `af2ded66 <https://github.com/dw/mitogen/commit/af2ded66>`_: add
|
|
:func:`mitogen.fork.on_fork` to allow non-Mitogen managed process forks to
|
|
clean up Mitogen resources in the child.
|
|
|
|
* `d6784242 <https://github.com/dw/mitogen/commit/d6784242>`_: the setns method
|
|
always resets ``HOME``, ``SHELL``, ``LOGNAME`` and ``USER`` environment
|
|
variables to an account in the target container, defaulting to ``root``.
|
|
|
|
* `830966bf <https://github.com/dw/mitogen/commit/830966bf>`_: the UNIX
|
|
listener no longer crashes if the peer process disappears in the middle of
|
|
connection setup.
|
|
|
|
|
|
Thanks!
|
|
~~~~~~~
|
|
|
|
Mitogen would not be possible without the support of users. A huge thanks for
|
|
bug reports, testing, features and fixes in this release contributed by
|
|
`Alex Russu <https://github.com/alexrussu>`_,
|
|
`Alex Willmer <https://github.com/moreati>`_,
|
|
`atoom <https://github.com/atoom>`_,
|
|
`Berend De Schouwer <https://github.com/berenddeschouwer>`_,
|
|
`Brian Candler <https://github.com/candlerb>`_,
|
|
`Dan Quackenbush <https://github.com/danquack>`_,
|
|
`dsgnr <https://github.com/dsgnr>`_,
|
|
`Jesse London <https://github.com/jesteria>`_,
|
|
`John McGrath <https://github.com/jmcgrath207>`_,
|
|
`Jonathan Rosser <https://github.com/jrosser>`_,
|
|
`Josh Smift <https://github.com/jbscare>`_,
|
|
`Luca Nunzi <https://github.com/0xlc>`_,
|
|
`Orion Poplawski <https://github.com/opoplawski>`_,
|
|
`Peter V. Saveliev <https://github.com/svinota>`_,
|
|
`Pierre-Henry Muller <https://github.com/pierrehenrymuller>`_,
|
|
`Pierre-Louis Bonicoli <https://github.com/jesteria>`_,
|
|
`Prateek Jain <https://github.com/prateekj201>`_,
|
|
`RedheatWei <https://github.com/RedheatWei>`_,
|
|
`Rick Box <https://github.com/boxrick>`_,
|
|
`nikitakazantsev12 <https://github.com/nikitakazantsev12>`_,
|
|
`Tawana Musewe <https://github.com/tbtmuse>`_,
|
|
`Timo Beckers <https://github.com/ti-mo>`_, and
|
|
`Yannig Perré <https://github.com/yannig>`_.
|
|
|
|
|
|
v0.2.2 (2018-07-26)
|
|
-------------------
|
|
|
|
Mitogen for Ansible
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
* `#291 <https://github.com/dw/mitogen/issues/291>`_: ``ansible_*_interpreter``
|
|
variables are parsed using a restrictive shell-like syntax, supporting a
|
|
common idiom where ``ansible_python_interpreter`` is set to ``/usr/bin/env
|
|
python``.
|
|
|
|
* `#299 <https://github.com/dw/mitogen/issues/299>`_: fix the ``network_cli``
|
|
connection type when the Mitogen strategy is active. Mitogen cannot help
|
|
network device connections, however it should still be possible to use device
|
|
connections while Mitogen is active.
|
|
|
|
* `#301 <https://github.com/dw/mitogen/pull/301>`_: variables like ``$HOME`` in
|
|
the ``remote_tmp`` setting are evaluated correctly.
|
|
|
|
* `#303 <https://github.com/dw/mitogen/pull/303>`_: the :ref:`doas` become method
|
|
is supported. Contributed by `Mike Walker
|
|
<https://github.com/napkindrawing>`_.
|
|
|
|
* `#309 <https://github.com/dw/mitogen/issues/309>`_: fix a regression to
|
|
process environment cleanup, caused by the change in v0.2.1 to run local
|
|
tasks with the correct environment.
|
|
|
|
* `#317 <https://github.com/dw/mitogen/issues/317>`_: respect the verbosity
|
|
setting when writing to Ansible's ``log_path``, if it is enabled. Child log
|
|
filtering was also incorrect, causing the master to needlessly wake many
|
|
times. This nets a 3.5% runtime improvement running against the local
|
|
machine.
|
|
|
|
* The ``mitogen_ssh_debug_level`` variable is supported, permitting SSH debug
|
|
output to be included in Mitogen's ``-vvv`` output when both are specified.
|
|
|
|
|
|
Core Library
|
|
~~~~~~~~~~~~
|
|
|
|
* `#291 <https://github.com/dw/mitogen/issues/291>`_: the ``python_path``
|
|
parameter may specify an argument vector prefix rather than a string program
|
|
path.
|
|
|
|
* `#300 <https://github.com/dw/mitogen/issues/300>`_: the broker could crash on
|
|
OS X during shutdown due to scheduled `kqueue
|
|
<https://www.freebsd.org/cgi/man.cgi?query=kevent>`_ filter changes for
|
|
descriptors that were closed before the IO loop resumes. As a temporary
|
|
workaround, kqueue's bulk change feature is not used.
|
|
|
|
* `#303 <https://github.com/dw/mitogen/pull/303>`_: the :ref:`doas` become method
|
|
is now supported. Contributed by `Mike Walker
|
|
<https://github.com/napkindrawing>`_.
|
|
|
|
* `#307 <https://github.com/dw/mitogen/issues/307>`_: SSH login banner output
|
|
containing the word 'password' is no longer confused for a password prompt.
|
|
|
|
* `#319 <https://github.com/dw/mitogen/issues/319>`_: SSH connections would
|
|
fail immediately on Windows Subsystem for Linux, due to use of `TCSAFLUSH`
|
|
with :func:`termios.tcsetattr`. The flag is omitted if WSL is detected.
|
|
|
|
* `#320 <https://github.com/dw/mitogen/issues/320>`_: The OS X poller
|
|
could spuriously wake up due to ignoring an error bit set on events returned
|
|
by the kernel, manifesting as a failure to read from an unrelated descriptor.
|
|
|
|
* `#342 <https://github.com/dw/mitogen/issues/342>`_: The ``network_cli``
|
|
connection type would fail due to a missing internal SSH plugin method.
|
|
|
|
* Standard IO forwarding accidentally configured the replacement ``stdout`` and
|
|
``stderr`` write descriptors as non-blocking, causing subprocesses that
|
|
generate more output than kernel buffer space existed to throw errors. The
|
|
write ends are now configured as blocking.
|
|
|
|
* When :func:`mitogen.core.enable_profiling` is active, :mod:`mitogen.service`
|
|
threads are profiled just like other threads.
|
|
|
|
* The ``ssh_debug_level`` parameter is supported, permitting SSH debug output
|
|
to be redirected to a Mitogen logger when specified.
|
|
|
|
* Debug logs containing command lines are printed with the minimal quoting and
|
|
escaping required.
|
|
|
|
|
|
Thanks!
|
|
~~~~~~~
|
|
|
|
Mitogen would not be possible without the support of users. A huge thanks for
|
|
the bug reports and pull requests in this release contributed by
|
|
`Alex Russu <https://github.com/alexrussu>`_,
|
|
`Andy Freeland <https://github.com/rouge8>`_,
|
|
`Ayaz Ahmed Khan <https://github.com/ayaz>`_,
|
|
`Colin McCarthy <https://github.com/colin-mccarthy>`_,
|
|
`Dan Quackenbush <https://github.com/danquack>`_,
|
|
`Duane Zamrok <https://github.com/dewthefifth>`_,
|
|
`Gonzalo Servat <https://github.com/gservat>`_,
|
|
`Guy Knights <https://github.com/knightsg>`_,
|
|
`Josh Smift <https://github.com/jbscare>`_,
|
|
`Mark Janssen <https://github.com/sigio>`_,
|
|
`Mike Walker <https://github.com/napkindrawing>`_,
|
|
`Orion Poplawski <https://github.com/opoplawski>`_,
|
|
`falbanese <https://github.com/falbanese>`_,
|
|
`Tawana Musewe <https://github.com/tbtmuse>`_, and
|
|
`Zach Swanson <https://github.com/zswanson>`_.
|
|
|
|
|
|
v0.2.1 (2018-07-10)
|
|
-------------------
|
|
|
|
Mitogen for Ansible
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
* `#297 <https://github.com/dw/mitogen/issues/297>`_: compatibility: local
|
|
actions set their working directory to that of their defining playbook, and
|
|
inherit a process environment as if they were executed as a subprocess of the
|
|
forked task worker.
|
|
|
|
|
|
v0.2.0 (2018-07-09)
|
|
-------------------
|
|
|
|
Mitogen 0.2.x is the inaugural feature-frozen branch eligible for fixes only,
|
|
except for problem areas listed as in-scope below. While stable from a
|
|
development perspective, it should still be considered "beta" at least for the
|
|
initial releases.
|
|
|
|
**In Scope**
|
|
|
|
* Python 3.x performance improvements
|
|
* Subprocess reaping improvements
|
|
* Major documentation improvements
|
|
* PyPI/packaging improvements
|
|
* Test suite improvements
|
|
* Replacement CI system to handle every supported OS
|
|
* Minor deviations from vanilla Ansible behaviour
|
|
* Ansible ``raw`` action support
|
|
|
|
The goal is a *tick/tock* model where even-numbered series are a maturation of
|
|
the previous unstable series, and unstable series are released on PyPI with
|
|
``--pre`` enabled. The API and user visible behaviour should remain unchanged
|
|
within a stable series.
|
|
|
|
|
|
Mitogen for Ansible
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
* Support for Ansible 2.3 - 2.7.x and any mixture of Python 2.6, 2.7 or 3.6 on
|
|
controller and target nodes.
|
|
|
|
* Drop-in support for many Ansible connection types.
|
|
|
|
* Preview of Connection Delegation feature.
|
|
|
|
* Built-in file transfer compatible with connection delegation.
|
|
|
|
|
|
Core Library
|
|
~~~~~~~~~~~~
|
|
|
|
* Synchronous connection establishment via OpenSSH, sudo, su, Docker, LXC and
|
|
FreeBSD Jails, local subprocesses and :func:`os.fork`. Parallel connection
|
|
setup is possible using multiple threads. Connections may be used from one or
|
|
many threads after establishment.
|
|
|
|
* UNIX masters and children, with Linux, MacOS, FreeBSD, NetBSD, OpenBSD and
|
|
Windows Subsystem for Linux explicitly supported.
|
|
|
|
* Automatic tests covering Python 2.6, 2.7 and 3.6 on Linux only.
|