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# (c) 2012, Jan-Piet Mens <jpmens(at)gmail.com> # (c) 2017 Ansible Project # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt) from __future__ import (absolute_import, division, print_function) __metaclass__ = type DOCUMENTATION = """ name: env author: Jan-Piet Mens (@jpmens) <jpmens(at)gmail.com> version_added: "0.9" short_description: Read the value of environment variables description: - Allows you to query the environment variables available on the controller when you invoked Ansible. options: _terms: description: - Environment variable or list of them to lookup the values for. required: True default: description: What return when the variable is undefined type: raw default: '' version_added: '2.13' notes: - You can pass the C(Undefined) object as C(default) to force an undefined error """ EXAMPLES = """ - name: Basic usage ansible.builtin.debug: msg: "'{{ lookup('ansible.builtin.env', 'HOME') }}' is the HOME environment variable." - name: Before 2.13, how to set default value if the variable is not defined. This cannot distinguish between USR undefined and USR=''. ansible.builtin.debug: msg: "{{ lookup('ansible.builtin.env', 'USR')|default('nobody', True) }} is the user." - name: Example how to set default value if the variable is not defined, ignores USR='' ansible.builtin.debug: msg: "{{ lookup('ansible.builtin.env', 'USR', default='nobody') }} is the user." - name: Set default value to Undefined, if the variable is not defined ansible.builtin.debug: msg: "{{ lookup('ansible.builtin.env', 'USR', default=Undefined) }} is the user." - name: Set default value to undef(), if the variable is not defined ansible.builtin.debug: msg: "{{ lookup('ansible.builtin.env', 'USR', default=undef()) }} is the user." """ RETURN = """ _list: description: - Values from the environment variables. type: list """ from jinja2.runtime import Undefined from ansible.errors import AnsibleUndefinedVariable from ansible.plugins.lookup import LookupBase from ansible.utils import py3compat class LookupModule(LookupBase): def run(self, terms, variables, **kwargs): self.set_options(var_options=variables, direct=kwargs) ret = [] d = self.get_option('default') for term in terms: var = term.split()[0] val = py3compat.environ.get(var, d) if isinstance(val, Undefined): raise AnsibleUndefinedVariable('The "env" lookup, found an undefined variable: %s' % var) ret.append(val) return ret