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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