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ansible: initial mitogen_host_pinned strategy.

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dw committed Dec 11, 2018
1 parent 863e1ae commit 09aa27a6a724561b6e8d6ed432bab49abfc105fc
Showing with 70 additions and 2 deletions.
  1. +67 −0 ansible_mitogen/plugins/strategy/mitogen_host_pinned.py
  2. +3 −2 docs/ansible.rst
@@ -0,0 +1,67 @@
# Copyright 2017, David Wilson
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

from __future__ import absolute_import
import os.path
import sys

#
# This is not the real Strategy implementation module, it simply exists as a
# proxy to the real module, which is loaded using Python's regular import
# mechanism, to prevent Ansible's PluginLoader from making up a fake name that
# results in ansible_mitogen plugin modules being loaded twice: once by
# PluginLoader with a name like "ansible.plugins.strategy.mitogen", which is
# stuffed into sys.modules even though attempting to import it will trigger an
# ImportError, and once under its canonical name, "ansible_mitogen.strategy".
#
# Therefore we have a proxy module that imports it under the real name, and
# sets up the duff PluginLoader-imported module to just contain objects from
# the real module, so duplicate types don't exist in memory, and things like
# debuggers and isinstance() work predictably.
#

BASE_DIR = os.path.abspath(
os.path.join(os.path.dirname(__file__), '../../..')
)

if BASE_DIR not in sys.path:
sys.path.insert(0, BASE_DIR)

import ansible_mitogen.loaders
import ansible_mitogen.strategy


Base = ansible_mitogen.loaders.strategy_loader.get('host_pinned', class_only=True)

if Base is None:
raise ImportError(
'The host_pinned strategy is only available in Ansible 2.7 or newer.'
)

class StrategyModule(ansible_mitogen.strategy.StrategyMixin, Base):
pass
@@ -70,8 +70,9 @@ Installation

The ``strategy`` key is optional. If omitted, the
``ANSIBLE_STRATEGY=mitogen_linear`` environment variable can be set on a
per-run basis. Like ``mitogen_linear``, the ``mitogen_free`` strategy exists
to mimic the ``free`` strategy.
per-run basis. Like ``mitogen_linear``, the ``mitogen_free`` and
``mitogen_host_pinned`` strategies exists to mimic the ``free`` and
``host_pinned`` strategies.

4. If targets have a restrictive ``sudoers`` file, add a rule like:

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