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Add subcommands parameter for module alternatives. (#4654)
* Add slaves parameter for module alternatives. * alternatives: Improve documentation abous slaves parameter * alternatives: Apply suggestions from code review Co-authored-by: Felix Fontein <felix@fontein.de> * alternatives: Add schangelog for slaves parameter * alernatives: Add integration tests * alternatives: Improv tests * alternatives: Update tests/integration/targets/alternatives/tasks/slaves.yml Co-authored-by: Felix Fontein <felix@fontein.de> * alternatives: Rework logic to support updating priority and subcommands * alternatives: Use more inclusive naming * alternatives: Fix linter warnings * alternatives: Dont fail if link is absent * alternatives: Update changelog fragment * alternatives: Add tests for prio change and removing * alternatives: Apply suggestions from code review Co-authored-by: Felix Fontein <felix@fontein.de> * alternatives: Add `state=auto`to reset mode to auto * alternatives: Fix linter warnings * alternatives: Fix documentation. * alternatives: Combine multiple messages. * alternatives: Set command env for all commands. * alternatives: Do not update subcommands if parameter is omited * alternatives: Fix a bug with python 2.7 var scoping * alternatives: Improce diff before generation * alternatives: Fix linter warnings * alternatives: Fix test names * alternatives: Simplify subcommands handling and improve diffs * aliases: Only test for subcommand changes if subcommands parameter is set. * Update plugins/modules/system/alternatives.py Co-authored-by: Felix Fontein <felix@fontein.de> * Apply suggestions from code review Co-authored-by: Felix Fontein <felix@fontein.de>
This commit is contained in:
Marius Rieder
GitHub
parent
62ff263ac1
commit
373da56b5b
8 changed files with 420 additions and 106 deletions
2
.github/BOTMETA.yml
vendored
2
.github/BOTMETA.yml
vendored
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@ -1027,7 +1027,7 @@ files:
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$modules/system/alternatives.py:
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maintainers: mulby
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labels: alternatives
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ignore: DavidWittman
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ignore: DavidWittman jiuka
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$modules/system/aix_lvol.py:
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maintainers: adejoux
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$modules/system/awall.py:
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@ -0,0 +1,3 @@
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minor_changes:
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- alternatives - add ``subcommands`` parameter (https://github.com/ansible-collections/community.general/pull/4654).
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- alternatives - add ``state=absent`` to be able to remove an alternative (https://github.com/ansible-collections/community.general/pull/4654).
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@ -3,6 +3,7 @@
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# Copyright: (c) 2014, Gabe Mulley <gabe.mulley@gmail.com>
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# Copyright: (c) 2015, David Wittman <dwittman@gmail.com>
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# Copyright: (c) 2022, Marius Rieder <marius.rieder@scs.com>
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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@ -17,6 +18,7 @@ description:
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- Manages symbolic links using the 'update-alternatives' tool.
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- Useful when multiple programs are installed but provide similar functionality (e.g. different editors).
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author:
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- Marius Rieder (@jiuka)
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- David Wittman (@DavidWittman)
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- Gabe Mulley (@mulby)
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options:
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@ -47,10 +49,36 @@ options:
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not set it as the currently selected alternative for the group.
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- C(selected) - install the alternative (if not already installed), and
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set it as the currently selected alternative for the group.
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choices: [ present, selected ]
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- C(auto) - install the alternative (if not already installed), and
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set the group to auto mode. Added in community.general 5.1.0.
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- C(absent) - removes the alternative. Added in community.general 5.1.0.
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choices: [ present, selected, auto, absent ]
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default: selected
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type: str
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version_added: 4.8.0
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subcommands:
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description:
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- A list of subcommands.
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- Each subcommand needs a name, a link and a path parameter.
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type: list
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elements: dict
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aliases: ['slaves']
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suboptions:
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name:
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description:
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- The generic name of the subcommand.
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type: str
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required: true
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path:
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description:
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- The path to the real executable that the subcommand should point to.
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type: path
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required: true
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link:
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description:
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- The path to the symbolic link that should point to the real subcommand executable.
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type: path
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version_added: 5.1.0
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requirements: [ update-alternatives ]
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'''
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@ -78,6 +106,23 @@ EXAMPLES = r'''
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path: /usr/bin/python3.5
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link: /usr/bin/python
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state: present
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- name: Install Python 3.5 and reset selection to auto
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community.general.alternatives:
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name: python
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path: /usr/bin/python3.5
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link: /usr/bin/python
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state: auto
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- name: keytool is a subcommand of java
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community.general.alternatives:
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name: java
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link: /usr/bin/java
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path: /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
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subcommands:
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- name: keytool
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link: /usr/bin/keytool
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path: /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/keytool
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'''
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import os
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@ -90,10 +135,235 @@ from ansible.module_utils.basic import AnsibleModule
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class AlternativeState:
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PRESENT = "present"
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SELECTED = "selected"
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ABSENT = "absent"
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AUTO = "auto"
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@classmethod
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def to_list(cls):
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return [cls.PRESENT, cls.SELECTED]
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return [cls.PRESENT, cls.SELECTED, cls.ABSENT, cls.AUTO]
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class AlternativesModule(object):
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_UPDATE_ALTERNATIVES = None
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def __init__(self, module):
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self.module = module
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self.result = dict(changed=False, diff=dict(before=dict(), after=dict()))
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self.module.run_command_environ_update = {'LC_ALL': 'C'}
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self.messages = []
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self.run()
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@property
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def mode_present(self):
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return self.module.params.get('state') in [AlternativeState.PRESENT, AlternativeState.SELECTED, AlternativeState.AUTO]
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@property
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def mode_selected(self):
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return self.module.params.get('state') == AlternativeState.SELECTED
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@property
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def mode_auto(self):
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return self.module.params.get('state') == AlternativeState.AUTO
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def run(self):
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self.parse()
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if self.mode_present:
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# Check if we need to (re)install
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subcommands_parameter = self.module.params['subcommands']
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if (
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self.path not in self.current_alternatives or
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self.current_alternatives[self.path].get('priority') != self.priority or
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(subcommands_parameter is not None and (
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not all(s in subcommands_parameter for s in self.current_alternatives[self.path].get('subcommands')) or
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not all(s in self.current_alternatives[self.path].get('subcommands') for s in subcommands_parameter)
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))
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):
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self.install()
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# Check if we need to set the preference
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if self.mode_selected and self.current_path != self.path:
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self.set()
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# Check if we need to reset to auto
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if self.mode_auto and self.current_mode == 'manual':
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self.auto()
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else:
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# Check if we need to uninstall
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if self.path in self.current_alternatives:
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self.remove()
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self.result['msg'] = ' '.join(self.messages)
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self.module.exit_json(**self.result)
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def install(self):
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if not os.path.exists(self.path):
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self.module.fail_json(msg="Specified path %s does not exist" % self.path)
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if not self.link:
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self.module.fail_json(msg='Needed to install the alternative, but unable to do so as we are missing the link')
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cmd = [self.UPDATE_ALTERNATIVES, '--install', self.link, self.name, self.path, str(self.priority)]
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if self.subcommands is not None:
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subcommands = [['--slave', subcmd['link'], subcmd['name'], subcmd['path']] for subcmd in self.subcommands]
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cmd += [item for sublist in subcommands for item in sublist]
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self.result['changed'] = True
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self.messages.append("Install alternative '%s' for '%s'." % (self.path, self.name))
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if not self.module.check_mode:
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self.module.run_command(cmd, check_rc=True)
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if self.module._diff:
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self.result['diff']['after'] = dict(
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state=AlternativeState.PRESENT,
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path=self.path,
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priority=self.priority,
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link=self.link,
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)
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if self.subcommands:
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self.result['diff']['after'].update(dict(
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subcommands=self.subcommands
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))
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def remove(self):
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cmd = [self.UPDATE_ALTERNATIVES, '--remove', self.name, self.path]
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self.result['changed'] = True
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self.messages.append("Remove alternative '%s' from '%s'." % (self.path, self.name))
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if not self.module.check_mode:
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self.module.run_command(cmd, check_rc=True)
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if self.module._diff:
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self.result['diff']['after'] = dict(state=AlternativeState.ABSENT)
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def set(self):
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cmd = [self.UPDATE_ALTERNATIVES, '--set', self.name, self.path]
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self.result['changed'] = True
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self.messages.append("Set alternative '%s' for '%s'." % (self.path, self.name))
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if not self.module.check_mode:
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self.module.run_command(cmd, check_rc=True)
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if self.module._diff:
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self.result['diff']['after']['state'] = AlternativeState.SELECTED
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def auto(self):
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cmd = [self.UPDATE_ALTERNATIVES, '--auto', self.name]
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self.messages.append("Set alternative to auto for '%s'." % (self.name))
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self.result['changed'] = True
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if not self.module.check_mode:
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self.module.run_command(cmd, check_rc=True)
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if self.module._diff:
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self.result['diff']['after']['state'] = AlternativeState.PRESENT
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@property
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def name(self):
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return self.module.params.get('name')
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@property
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def path(self):
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return self.module.params.get('path')
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@property
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def link(self):
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return self.module.params.get('link') or self.current_link
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@property
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def priority(self):
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return self.module.params.get('priority')
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@property
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def subcommands(self):
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if self.module.params.get('subcommands') is not None:
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return self.module.params.get('subcommands')
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elif self.path in self.current_alternatives and self.current_alternatives[self.path].get('subcommands'):
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return self.current_alternatives[self.path].get('subcommands')
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return None
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@property
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def UPDATE_ALTERNATIVES(self):
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if self._UPDATE_ALTERNATIVES is None:
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self._UPDATE_ALTERNATIVES = self.module.get_bin_path('update-alternatives', True)
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return self._UPDATE_ALTERNATIVES
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def parse(self):
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self.current_mode = None
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self.current_path = None
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self.current_link = None
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self.current_alternatives = {}
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# Run `update-alternatives --display <name>` to find existing alternatives
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(rc, display_output, dummy) = self.module.run_command(
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[self.UPDATE_ALTERNATIVES, '--display', self.name]
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)
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if rc != 0:
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self.module.debug("No current alternative found. '%s' exited with %s" % (self.UPDATE_ALTERNATIVES, rc))
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return
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current_mode_regex = re.compile(r'\s-\s(?:status\sis\s)?(\w*)(?:\smode|.)$', re.MULTILINE)
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current_path_regex = re.compile(r'^\s*link currently points to (.*)$', re.MULTILINE)
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current_link_regex = re.compile(r'^\s*link \w+ is (.*)$', re.MULTILINE)
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subcmd_path_link_regex = re.compile(r'^\s*slave (\S+) is (.*)$', re.MULTILINE)
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alternative_regex = re.compile(r'^(\/.*)\s-\s(?:family\s\S+\s)?priority\s(\d+)((?:\s+slave.*)*)', re.MULTILINE)
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subcmd_regex = re.compile(r'^\s+slave (.*): (.*)$', re.MULTILINE)
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match = current_mode_regex.search(display_output)
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if not match:
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self.module.debug("No current mode found in output")
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return
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self.current_mode = match.group(1)
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match = current_path_regex.search(display_output)
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if not match:
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self.module.debug("No current path found in output")
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else:
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self.current_path = match.group(1)
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match = current_link_regex.search(display_output)
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if not match:
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self.module.debug("No current link found in output")
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else:
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self.current_link = match.group(1)
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subcmd_path_map = dict(subcmd_path_link_regex.findall(display_output))
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if not subcmd_path_map and self.subcommands:
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subcmd_path_map = dict((s['name'], s['link']) for s in self.subcommands)
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for path, prio, subcmd in alternative_regex.findall(display_output):
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self.current_alternatives[path] = dict(
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priority=int(prio),
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subcommands=[dict(
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name=name,
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path=spath,
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link=subcmd_path_map.get(name)
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) for name, spath in subcmd_regex.findall(subcmd) if spath != '(null)']
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)
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if self.module._diff:
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if self.path in self.current_alternatives:
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self.result['diff']['before'].update(dict(
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state=AlternativeState.PRESENT,
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path=self.path,
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priority=self.current_alternatives[self.path].get('priority'),
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link=self.current_link,
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))
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if self.current_alternatives[self.path].get('subcommands'):
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self.result['diff']['before'].update(dict(
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subcommands=self.current_alternatives[self.path].get('subcommands')
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))
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if self.current_mode == 'manual' and self.current_path != self.path:
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self.result['diff']['before'].update(dict(
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state=AlternativeState.SELECTED
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))
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else:
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self.result['diff']['before'].update(dict(
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state=AlternativeState.ABSENT
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))
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def main():
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@ -109,109 +379,16 @@ def main():
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choices=AlternativeState.to_list(),
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default=AlternativeState.SELECTED,
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),
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subcommands=dict(type='list', elements='dict', aliases=['slaves'], options=dict(
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name=dict(type='str', required=True),
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path=dict(type='path', required=True),
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link=dict(type='path'),
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)),
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),
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supports_check_mode=True,
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)
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params = module.params
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name = params['name']
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path = params['path']
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link = params['link']
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priority = params['priority']
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state = params['state']
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UPDATE_ALTERNATIVES = module.get_bin_path('update-alternatives', True)
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current_path = None
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all_alternatives = []
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# Run `update-alternatives --display <name>` to find existing alternatives
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(rc, display_output, dummy) = module.run_command(
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['env', 'LC_ALL=C', UPDATE_ALTERNATIVES, '--display', name]
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)
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if rc == 0:
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# Alternatives already exist for this link group
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# Parse the output to determine the current path of the symlink and
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# available alternatives
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current_path_regex = re.compile(r'^\s*link currently points to (.*)$',
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re.MULTILINE)
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alternative_regex = re.compile(r'^(\/.*)\s-\s(?:family\s\S+\s)?priority', re.MULTILINE)
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match = current_path_regex.search(display_output)
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if match:
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current_path = match.group(1)
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all_alternatives = alternative_regex.findall(display_output)
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if not link:
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# Read the current symlink target from `update-alternatives --query`
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# in case we need to install the new alternative before setting it.
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#
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# This is only compatible on Debian-based systems, as the other
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# alternatives don't have --query available
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rc, query_output, dummy = module.run_command(
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['env', 'LC_ALL=C', UPDATE_ALTERNATIVES, '--query', name]
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)
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if rc == 0:
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for line in query_output.splitlines():
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if line.startswith('Link:'):
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link = line.split()[1]
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break
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changed = False
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if current_path != path:
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# Check mode: expect a change if this alternative is not already
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# installed, or if it is to be set as the current selection.
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if module.check_mode:
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module.exit_json(
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changed=(
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path not in all_alternatives or
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state == AlternativeState.SELECTED
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),
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current_path=current_path,
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)
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try:
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# install the requested path if necessary
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if path not in all_alternatives:
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if not os.path.exists(path):
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module.fail_json(msg="Specified path %s does not exist" % path)
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if not link:
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module.fail_json(msg="Needed to install the alternative, but unable to do so as we are missing the link")
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module.run_command(
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[UPDATE_ALTERNATIVES, '--install', link, name, path, str(priority)],
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check_rc=True
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)
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changed = True
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# set the current selection to this path (if requested)
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if state == AlternativeState.SELECTED:
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module.run_command(
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[UPDATE_ALTERNATIVES, '--set', name, path],
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check_rc=True
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)
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changed = True
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except subprocess.CalledProcessError as cpe:
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module.fail_json(msg=str(dir(cpe)))
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elif current_path == path and state == AlternativeState.PRESENT:
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# Case where alternative is currently selected, but state is set
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# to 'present'. In this case, we set to auto mode.
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if module.check_mode:
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module.exit_json(changed=True, current_path=current_path)
|
||||
|
||||
changed = True
|
||||
try:
|
||||
module.run_command(
|
||||
[UPDATE_ALTERNATIVES, '--auto', name],
|
||||
check_rc=True,
|
||||
)
|
||||
except subprocess.CalledProcessError as cpe:
|
||||
module.fail_json(msg=str(dir(cpe)))
|
||||
|
||||
module.exit_json(changed=changed)
|
||||
AlternativesModule(module)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
|
|
|
|||
|
|
@ -49,6 +49,9 @@
|
|||
# Test that path is checked: alternatives must fail when path is nonexistent
|
||||
- import_tasks: path_is_checked.yml
|
||||
|
||||
# Test that subcommands commands work
|
||||
- import_tasks: subcommands.yml
|
||||
|
||||
# Test operation of the 'state' parameter
|
||||
- block:
|
||||
- include_tasks: remove_links.yml
|
||||
|
|
|
|||
78
tests/integration/targets/alternatives/tasks/subcommands.yml
Normal file
78
tests/integration/targets/alternatives/tasks/subcommands.yml
Normal file
|
|
@ -0,0 +1,78 @@
|
|||
- name: Try with subcommands
|
||||
alternatives:
|
||||
name: dummymain
|
||||
path: '/usr/bin/dummy1'
|
||||
link: '/usr/bin/dummymain'
|
||||
subcommands:
|
||||
- name: dummysubcmd
|
||||
path: '/usr/bin/dummy2'
|
||||
link: '/usr/bin/dummysubcmd'
|
||||
register: alternative
|
||||
|
||||
- name: Check expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- 'alternative is changed'
|
||||
|
||||
- name: Execute the current dummymain command
|
||||
command: dummymain
|
||||
register: cmd
|
||||
|
||||
- name: Ensure that the expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy1"
|
||||
|
||||
- name: Execute the current dummysubcmd command
|
||||
command: dummysubcmd
|
||||
register: cmd
|
||||
|
||||
- name: Ensure that the expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy2"
|
||||
|
||||
- name: Subcommands are not removed if not specified
|
||||
alternatives:
|
||||
name: dummymain
|
||||
path: '/usr/bin/dummy1'
|
||||
link: '/usr/bin/dummymain'
|
||||
register: alternative
|
||||
|
||||
- name: Check expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- 'alternative is not changed'
|
||||
|
||||
- name: Execute the current dummysubcmd command
|
||||
command: dummysubcmd
|
||||
register: cmd
|
||||
|
||||
- name: Ensure that the expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy2"
|
||||
|
||||
- name: Subcommands are removed if set to an empty list
|
||||
alternatives:
|
||||
name: dummymain
|
||||
path: '/usr/bin/dummy1'
|
||||
link: '/usr/bin/dummymain'
|
||||
subcommands: []
|
||||
register: alternative
|
||||
|
||||
- name: Check expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- 'alternative is changed'
|
||||
|
||||
- name: Execute the current dummysubcmd command
|
||||
command: dummysubcmd
|
||||
register: cmd
|
||||
ignore_errors: True
|
||||
|
||||
- name: Ensure that the subcommand is gone
|
||||
assert:
|
||||
that:
|
||||
- cmd.rc == 2
|
||||
- '"No such file" in cmd.msg'
|
||||
|
|
@ -48,6 +48,4 @@
|
|||
when: ansible_os_family == 'RedHat' and not with_alternatives and item == 1
|
||||
|
||||
- name: check that alternative has been updated
|
||||
command: "grep -Pzq '/bin/dummy{{ item }}\\n' '{{ alternatives_dir }}/dummy'"
|
||||
# priority doesn't seem updated
|
||||
#command: "grep -Pzq '/bin/dummy{{ item }}\\n50' '{{ alternatives_dir }}/dummy'"
|
||||
command: "grep -Pzq '/bin/dummy{{ item }}\\n50' '{{ alternatives_dir }}/dummy'"
|
||||
|
|
|
|||
|
|
@ -21,3 +21,14 @@
|
|||
|
||||
- name: check that alternative has been updated
|
||||
command: "grep -Pzq '/bin/dummy{{ item }}\\n{{ 60 + item|int }}' '{{ alternatives_dir }}/dummy'"
|
||||
|
||||
- name: update dummy priority
|
||||
alternatives:
|
||||
name: dummy
|
||||
path: '/usr/bin/dummy{{ item }}'
|
||||
link: /usr/bin/dummy
|
||||
priority: '{{ 70 + item|int }}'
|
||||
register: alternative
|
||||
|
||||
- name: check that alternative priority has been updated
|
||||
command: "grep -Pzq '/bin/dummy{{ item }}\\n{{ 70 + item|int }}' '{{ alternatives_dir }}/dummy'"
|
||||
|
|
@ -49,6 +49,28 @@
|
|||
- cmd.stdout == "dummy4"
|
||||
|
||||
# Set the currently selected alternative to state = 'present' (was previously
|
||||
# selected), and ensure that this results in the group not being set to 'auto'
|
||||
# mode, and the alternative is still selected.
|
||||
- name: Set current selected dummy to state = present
|
||||
alternatives:
|
||||
name: dummy
|
||||
path: /usr/bin/dummy4
|
||||
link: /usr/bin/dummy
|
||||
state: present
|
||||
|
||||
- name: Ensure that the link group is in auto mode
|
||||
shell: 'head -n1 {{ alternatives_dir }}/dummy | grep "^manual$"'
|
||||
|
||||
- name: Execute the current dummy command
|
||||
shell: dummy
|
||||
register: cmd
|
||||
|
||||
- name: Ensure that the expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy4"
|
||||
|
||||
# Set the currently selected alternative to state = 'auto' (was previously
|
||||
# selected), and ensure that this results in the group being set to 'auto'
|
||||
# mode, and the highest priority alternative is selected.
|
||||
- name: Set current selected dummy to state = present
|
||||
|
|
@ -56,7 +78,7 @@
|
|||
name: dummy
|
||||
path: /usr/bin/dummy4
|
||||
link: /usr/bin/dummy
|
||||
state: present
|
||||
state: auto
|
||||
|
||||
- name: Ensure that the link group is in auto mode
|
||||
shell: 'head -n1 {{ alternatives_dir }}/dummy | grep "^auto$"'
|
||||
|
|
@ -69,3 +91,25 @@
|
|||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy2"
|
||||
|
||||
# Remove an alternative with state = 'absent' and make sure that
|
||||
# this change results in the alternative being removed.
|
||||
- name: Remove best dummy alternative with state = absent
|
||||
alternatives:
|
||||
name: dummy
|
||||
path: /usr/bin/dummy2
|
||||
state: absent
|
||||
|
||||
- name: Ensure that the link group is in auto mode
|
||||
shell: 'grep "/usr/bin/dummy2" {{ alternatives_dir }}/dummy'
|
||||
register: cmd
|
||||
failed_when: cmd.rc == 0
|
||||
|
||||
- name: Execute the current dummy command
|
||||
shell: dummy
|
||||
register: cmd
|
||||
|
||||
- name: Ensure that the expected command was executed
|
||||
assert:
|
||||
that:
|
||||
- cmd.stdout == "dummy1"
|
||||
|
|
|
|||
Loading…
Reference in a new issue