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# (c) 2013, seth vidal <skvidal@fedoraproject.org> red hat, inc
# (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: first_found
author: Seth Vidal (!UNKNOWN) <skvidal@fedoraproject.org>
version_added: historical
short_description: return first file found from list
description:
- This lookup checks a list of files and paths and returns the full path to the first combination found.
- As all lookups, when fed relative paths it will try use the current task's location first and go up the chain
to the containing locations of role / play / include and so on.
- The list of files has precedence over the paths searched.
For example, A task in a role has a 'file1' in the play's relative path, this will be used, 'file2' in role's relative path will not.
- Either a list of files C(_terms) or a key C(files) with a list of files is required for this plugin to operate.
notes:
- This lookup can be used in 'dual mode', either passing a list of file names or a dictionary that has C(files) and C(paths).
options:
_terms:
description: A list of file names.
files:
description: A list of file names.
type: list
elements: string
default: []
paths:
description: A list of paths in which to look for the files.
type: list
elements: string
default: []
skip:
type: boolean
default: False
description:
- When C(True), return an empty list when no files are matched.
- This is useful when used with C(with_first_found), as an empty list return to C(with_) calls
causes the calling task to be skipped.
- When used as a template via C(lookup) or C(query), setting I(skip=True) will *not* cause the task to skip.
Tasks must handle the empty list return from the template.
- When C(False) and C(lookup) or C(query) specifies I(errors='ignore') all errors (including no file found,
but potentially others) return an empty string or an empty list respectively.
- When C(True) and C(lookup) or C(query) specifies I(errors='ignore'), no file found will return an empty
list and other potential errors return an empty string or empty list depending on the template call
(in other words return values of C(lookup) v C(query)).
"""
EXAMPLES = """
- name: Set _found_file to the first existing file, raising an error if a file is not found
ansible.builtin.set_fact:
_found_file: "{{ lookup('ansible.builtin.first_found', findme) }}"
vars:
findme:
- /path/to/foo.txt
- bar.txt # will be looked in files/ dir relative to role and/or play
- /path/to/biz.txt
- name: Set _found_file to the first existing file, or an empty list if no files found
ansible.builtin.set_fact:
_found_file: "{{ lookup('ansible.builtin.first_found', files, paths=['/extra/path'], skip=True) }}"
vars:
files:
- /path/to/foo.txt
- /path/to/bar.txt
- name: Include tasks only if one of the files exist, otherwise skip the task
ansible.builtin.include_tasks:
file: "{{ item }}"
with_first_found:
- files:
- path/tasks.yaml
- path/other_tasks.yaml
skip: True
- name: Include tasks only if one of the files exists, otherwise skip
ansible.builtin.include_tasks: '{{ tasks_file }}'
when: tasks_file != ""
vars:
tasks_file: "{{ lookup('ansible.builtin.first_found', files=['tasks.yaml', 'other_tasks.yaml'], errors='ignore') }}"
- name: |
copy first existing file found to /some/file,
looking in relative directories from where the task is defined and
including any play objects that contain it
ansible.builtin.copy:
src: "{{ lookup('ansible.builtin.first_found', findme) }}"
dest: /some/file
vars:
findme:
- foo
- "{{ inventory_hostname }}"
- bar
- name: same copy but specific paths
ansible.builtin.copy:
src: "{{ lookup('ansible.builtin.first_found', params) }}"
dest: /some/file
vars:
params:
files:
- foo
- "{{ inventory_hostname }}"
- bar
paths:
- /tmp/production
- /tmp/staging
- name: INTERFACES | Create Ansible header for /etc/network/interfaces
ansible.builtin.template:
src: "{{ lookup('ansible.builtin.first_found', findme)}}"
dest: "/etc/foo.conf"
vars:
findme:
- "{{ ansible_virtualization_type }}_foo.conf"
- "default_foo.conf"
- name: read vars from first file found, use 'vars/' relative subdir
ansible.builtin.include_vars: "{{lookup('ansible.builtin.first_found', params)}}"
vars:
params:
files:
- '{{ ansible_distribution }}.yml'
- '{{ ansible_os_family }}.yml'
- default.yml
paths:
- 'vars'
"""
RETURN = """
_raw:
description:
- path to file found
type: list
elements: path
"""
import os
import re
from collections.abc import Mapping, Sequence
from jinja2.exceptions import UndefinedError
from ansible.errors import AnsibleLookupError, AnsibleUndefinedVariable
from ansible.module_utils.six import string_types
from ansible.plugins.lookup import LookupBase
def _split_on(terms, spliters=','):
termlist = []
if isinstance(terms, string_types):
termlist = re.split(r'[%s]' % ''.join(map(re.escape, spliters)), terms)
else:
# added since options will already listify
for t in terms:
termlist.extend(_split_on(t, spliters))
return termlist
class LookupModule(LookupBase):
def _process_terms(self, terms, variables, kwargs):
total_search = []
skip = False
# can use a dict instead of list item to pass inline config
for term in terms:
if isinstance(term, Mapping):
self.set_options(var_options=variables, direct=term)
elif isinstance(term, string_types):
self.set_options(var_options=variables, direct=kwargs)
elif isinstance(term, Sequence):
partial, skip = self._process_terms(term, variables, kwargs)
total_search.extend(partial)
continue
else:
raise AnsibleLookupError("Invalid term supplied, can handle string, mapping or list of strings but got: %s for %s" % (type(term), term))
files = self.get_option('files')
paths = self.get_option('paths')
# NOTE: this is used as 'global' but can be set many times?!?!?
skip = self.get_option('skip')
# magic extra spliting to create lists
filelist = _split_on(files, ',;')
pathlist = _split_on(paths, ',:;')
# create search structure
if pathlist:
for path in pathlist:
for fn in filelist:
f = os.path.join(path, fn)
total_search.append(f)
elif filelist:
# NOTE: this seems wrong, should be 'extend' as any option/entry can clobber all
total_search = filelist
else:
total_search.append(term)
return total_search, skip
def run(self, terms, variables, **kwargs):
total_search, skip = self._process_terms(terms, variables, kwargs)
# NOTE: during refactor noticed that the 'using a dict' as term
# is designed to only work with 'one' otherwise inconsistencies will appear.
# see other notes below.
# actually search
subdir = getattr(self, '_subdir', 'files')
path = None
for fn in total_search:
try:
fn = self._templar.template(fn)
except (AnsibleUndefinedVariable, UndefinedError):
continue
# get subdir if set by task executor, default to files otherwise
path = self.find_file_in_search_path(variables, subdir, fn, ignore_missing=True)
# exit if we find one!
if path is not None:
return [path]
# if we get here, no file was found
if skip:
# NOTE: global skip wont matter, only last 'skip' value in dict term
return []
raise AnsibleLookupError("No file was found when using first_found.")
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