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+# Copyright (c), Michael DeHaan <michael.dehaan@gmail.com>, 2012-2013
+# Copyright (c), Toshio Kuratomi <tkuratomi@ansible.com> 2016
+# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+import platform
+
+from ansible.module_utils import distro
+from ansible.module_utils.common._utils import get_all_subclasses
+
+
+__all__ = ('get_distribution', 'get_distribution_version', 'get_platform_subclass')
+
+
+def get_distribution():
+ '''
+ Return the name of the distribution the module is running on.
+
+ :rtype: NativeString or None
+ :returns: Name of the distribution the module is running on
+
+ This function attempts to determine what distribution the code is running
+ on and return a string representing that value. If the platform is Linux
+ and the distribution cannot be determined, it returns ``OtherLinux``.
+ '''
+ distribution = distro.id().capitalize()
+
+ if platform.system() == 'Linux':
+ if distribution == 'Amzn':
+ distribution = 'Amazon'
+ elif distribution == 'Rhel':
+ distribution = 'Redhat'
+ elif not distribution:
+ distribution = 'OtherLinux'
+
+ return distribution
+
+
+def get_distribution_version():
+ '''
+ Get the version of the distribution the code is running on
+
+ :rtype: NativeString or None
+ :returns: A string representation of the version of the distribution. If it
+ cannot determine the version, it returns an empty string. If this is not run on
+ a Linux machine it returns None.
+ '''
+ version = None
+
+ needs_best_version = frozenset((
+ u'centos',
+ u'debian',
+ ))
+
+ version = distro.version()
+ distro_id = distro.id()
+
+ if version is not None:
+ if distro_id in needs_best_version:
+ version_best = distro.version(best=True)
+
+ # CentoOS maintainers believe only the major version is appropriate
+ # but Ansible users desire minor version information, e.g., 7.5.
+ # https://github.com/ansible/ansible/issues/50141#issuecomment-449452781
+ if distro_id == u'centos':
+ version = u'.'.join(version_best.split(u'.')[:2])
+
+ # Debian does not include minor version in /etc/os-release.
+ # Bug report filed upstream requesting this be added to /etc/os-release
+ # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931197
+ if distro_id == u'debian':
+ version = version_best
+
+ else:
+ version = u''
+
+ return version
+
+
+def get_distribution_codename():
+ '''
+ Return the code name for this Linux Distribution
+
+ :rtype: NativeString or None
+ :returns: A string representation of the distribution's codename or None if not a Linux distro
+ '''
+ codename = None
+ if platform.system() == 'Linux':
+ # Until this gets merged and we update our bundled copy of distro:
+ # https://github.com/nir0s/distro/pull/230
+ # Fixes Fedora 28+ not having a code name and Ubuntu Xenial Xerus needing to be "xenial"
+ os_release_info = distro.os_release_info()
+ codename = os_release_info.get('version_codename')
+
+ if codename is None:
+ codename = os_release_info.get('ubuntu_codename')
+
+ if codename is None and distro.id() == 'ubuntu':
+ lsb_release_info = distro.lsb_release_info()
+ codename = lsb_release_info.get('codename')
+
+ if codename is None:
+ codename = distro.codename()
+ if codename == u'':
+ codename = None
+
+ return codename
+
+
+def get_platform_subclass(cls):
+ '''
+ Finds a subclass implementing desired functionality on the platform the code is running on
+
+ :arg cls: Class to find an appropriate subclass for
+ :returns: A class that implements the functionality on this platform
+
+ Some Ansible modules have different implementations depending on the platform they run on. This
+ function is used to select between the various implementations and choose one. You can look at
+ the implementation of the Ansible :ref:`User module<user_module>` module for an example of how to use this.
+
+ This function replaces ``basic.load_platform_subclass()``. When you port code, you need to
+ change the callers to be explicit about instantiating the class. For instance, code in the
+ Ansible User module changed from::
+
+ .. code-block:: python
+
+ # Old
+ class User:
+ def __new__(cls, args, kwargs):
+ return load_platform_subclass(User, args, kwargs)
+
+ # New
+ class User:
+ def __new__(cls, *args, **kwargs):
+ new_cls = get_platform_subclass(User)
+ return super(cls, new_cls).__new__(new_cls)
+ '''
+ this_platform = platform.system()
+ distribution = get_distribution()
+
+ subclass = None
+
+ # get the most specific superclass for this platform
+ if distribution is not None:
+ for sc in get_all_subclasses(cls):
+ if sc.distribution is not None and sc.distribution == distribution and sc.platform == this_platform:
+ subclass = sc
+ if subclass is None:
+ for sc in get_all_subclasses(cls):
+ if sc.platform == this_platform and sc.distribution is None:
+ subclass = sc
+ if subclass is None:
+ subclass = cls
+
+ return subclass