ansible-later/ansiblelater/utils/yamlhelper.py

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"""Utils for YAML file operations."""
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# Copyright (c) 2013-2014 Will Thames <will@thames.id.au>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import codecs
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import glob
import imp
import os
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import ansible.parsing.mod_args
import yaml
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from ansible import constants
from ansible.errors import AnsibleError
from ansible.errors import AnsibleParserError
from ansible.parsing.dataloader import DataLoader
from ansible.parsing.mod_args import ModuleArgsParser
from ansible.parsing.yaml.constructor import AnsibleConstructor
from ansible.parsing.yaml.loader import AnsibleLoader
from ansible.template import Templar
from yaml.composer import Composer
from ansiblelater.exceptions import LaterAnsibleError
from ansiblelater.exceptions import LaterError
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try:
# Try to import the Ansible 2 module first, it's the future-proof one
from ansible.parsing.splitter import split_args
except ImportError:
# Fallback on the Ansible 1.9 module
from ansible.module_utils.splitter import split_args
def parse_yaml_from_file(filepath):
dl = DataLoader()
return dl.load_from_file(filepath)
def path_dwim(basedir, given):
dl = DataLoader()
dl.set_basedir(basedir)
return dl.path_dwim(given)
def ansible_template(basedir, varname, templatevars, **kwargs):
dl = DataLoader()
dl.set_basedir(basedir)
templar = Templar(dl, variables=templatevars)
return templar.template(varname, **kwargs)
try:
from ansible.plugins import module_loader
except ImportError:
from ansible.plugins.loader import module_loader
LINE_NUMBER_KEY = "__line__"
FILENAME_KEY = "__file__"
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VALID_KEYS = [
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"name",
"action",
"when",
"async",
"poll",
"notify",
"first_available_file",
"include",
"import_playbook",
"tags",
"register",
"ignore_errors",
"delegate_to",
"local_action",
"transport",
"remote_user",
"sudo",
"sudo_user",
"sudo_pass",
"when",
"connection",
"environment",
"args",
"always_run",
"any_errors_fatal",
"changed_when",
"failed_when",
"check_mode",
"delay",
"retries",
"until",
"su",
"su_user",
"su_pass",
"no_log",
"run_once",
"become",
"become_user",
"become_method",
FILENAME_KEY,
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]
BLOCK_NAME_TO_ACTION_TYPE_MAP = {
"tasks": "task",
"handlers": "handler",
"pre_tasks": "task",
"post_tasks": "task",
"block": "meta",
"rescue": "meta",
"always": "meta",
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}
def load_plugins(directory):
result = []
fh = None
for pluginfile in glob.glob(os.path.join(directory, "[A-Za-z]*.py")):
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pluginname = os.path.basename(pluginfile.replace(".py", ""))
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try:
fh, filename, desc = imp.find_module(pluginname, [directory])
mod = imp.load_module(pluginname, fh, filename, desc)
obj = getattr(mod, pluginname)()
result.append(obj)
finally:
if fh:
fh.close()
return result
def tokenize(line):
tokens = line.lstrip().split(" ")
if tokens[0] == "-":
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tokens = tokens[1:]
if tokens[0] == "action:" or tokens[0] == "local_action:":
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tokens = tokens[1:]
command = tokens[0].replace(":", "")
args = list()
kwargs = dict()
nonkvfound = False
for arg in tokens[1:]:
if "=" in arg and not nonkvfound:
kv = arg.split("=", 1)
kwargs[kv[0]] = kv[1]
else:
nonkvfound = True
args.append(arg)
return (command, args, kwargs)
def _playbook_items(pb_data):
if isinstance(pb_data, dict):
return pb_data.items()
elif not pb_data:
return []
else:
return [item for play in pb_data for item in play.items()]
def find_children(playbook, playbook_dir):
if not os.path.exists(playbook[0]):
return []
if playbook[1] == "role":
playbook_ds = {"roles": [{"role": playbook[0]}]}
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else:
try:
playbook_ds = parse_yaml_from_file(playbook[0])
except AnsibleError as e:
raise SystemExit(str(e))
results = []
basedir = os.path.dirname(playbook[0])
items = _playbook_items(playbook_ds)
for item in items:
for child in play_children(basedir, item, playbook[1], playbook_dir):
if "$" in child["path"] or "{{" in child["path"]:
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continue
valid_tokens = list()
for token in split_args(child["path"]):
if "=" in token:
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break
valid_tokens.append(token)
path = " ".join(valid_tokens)
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results.append({"path": path_dwim(basedir, path), "type": child["type"]})
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return results
def template(basedir, value, variables, fail_on_undefined=False, **kwargs):
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try:
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value = ansible_template(
os.path.abspath(basedir), value, variables,
**dict(kwargs, fail_on_undefined=fail_on_undefined)
)
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# Hack to skip the following exception when using to_json filter on a variable.
# I guess the filter doesn't like empty vars...
except (AnsibleError, ValueError):
# templating failed, so just keep value as is.
pass
return value
def play_children(basedir, item, parent_type, playbook_dir):
delegate_map = {
"tasks": _taskshandlers_children,
"pre_tasks": _taskshandlers_children,
"post_tasks": _taskshandlers_children,
"block": _taskshandlers_children,
"include": _include_children,
"import_playbook": _include_children,
"roles": _roles_children,
"dependencies": _roles_children,
"handlers": _taskshandlers_children,
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}
(k, v) = item
play_library = os.path.join(os.path.abspath(basedir), "library")
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_load_library_if_exists(play_library)
if k in delegate_map:
if v:
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v = template(
os.path.abspath(basedir),
v,
dict(playbook_dir=os.path.abspath(basedir)),
fail_on_undefined=False
)
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return delegate_map[k](basedir, k, v, parent_type)
return []
def _include_children(basedir, k, v, parent_type):
# handle include: filename.yml tags=blah
(command, args, kwargs) = tokenize("{0}: {1}".format(k, v))
result = path_dwim(basedir, args[0])
if not os.path.exists(result) and not basedir.endswith("tasks"):
result = path_dwim(os.path.join(basedir, "..", "tasks"), v)
return [{"path": result, "type": parent_type}]
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def _taskshandlers_children(basedir, k, v, parent_type):
results = []
for th in v:
if "include" in th:
append_children(th["include"], basedir, k, parent_type, results)
elif "include_tasks" in th:
append_children(th["include_tasks"], basedir, k, parent_type, results)
elif "import_playbook" in th:
append_children(th["import_playbook"], basedir, k, parent_type, results)
elif "import_tasks" in th:
append_children(th["import_tasks"], basedir, k, parent_type, results)
elif "import_role" in th:
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results.extend(
_roles_children(
basedir,
k, [th["import_role"].get("name")],
parent_type,
main=th["import_role"].get("tasks_from", "main")
)
)
elif "include_role" in th:
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results.extend(
_roles_children(
basedir,
k, [th["include_role"].get("name")],
parent_type,
main=th["include_role"].get("tasks_from", "main")
)
)
elif "block" in th:
results.extend(_taskshandlers_children(basedir, k, th["block"], parent_type))
if "rescue" in th:
results.extend(_taskshandlers_children(basedir, k, th["rescue"], parent_type))
if "always" in th:
results.extend(_taskshandlers_children(basedir, k, th["always"], parent_type))
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return results
def append_children(taskhandler, basedir, k, parent_type, results):
# when taskshandlers_children is called for playbooks, the
# actual type of the included tasks is the section containing the
# include, e.g. tasks, pre_tasks, or handlers.
if parent_type == "playbook":
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playbook_section = k
else:
playbook_section = parent_type
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results.append({"path": path_dwim(basedir, taskhandler), "type": playbook_section})
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def _roles_children(basedir, k, v, parent_type, main="main"):
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results = []
for role in v:
if isinstance(role, dict):
if "role" in role or "name" in role:
if "tags" not in role or "skip_ansible_later" not in role["tags"]:
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results.extend(
_look_for_role_files(
basedir, role.get("role", role.get("name")), main=main
)
)
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else:
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raise SystemExit(
"role dict {0} does not contain a 'role' "
"or 'name' key".format(role)
)
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else:
results.extend(_look_for_role_files(basedir, role, main=main))
return results
def _load_library_if_exists(path):
if os.path.exists(path):
module_loader.add_directory(path)
def _rolepath(basedir, role):
role_path = None
possible_paths = [
# if included from a playbook
path_dwim(basedir, os.path.join("roles", role)),
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path_dwim(basedir, role),
# if included from roles/[role]/meta/main.yml
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path_dwim(basedir, os.path.join("..", "..", "..", "roles", role)),
path_dwim(basedir, os.path.join("..", "..", role))
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]
if constants.DEFAULT_ROLES_PATH:
search_locations = constants.DEFAULT_ROLES_PATH
if isinstance(search_locations, str):
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search_locations = search_locations.split(os.pathsep)
for loc in search_locations:
loc = os.path.expanduser(loc)
possible_paths.append(path_dwim(loc, role))
for path_option in possible_paths:
if os.path.isdir(path_option):
role_path = path_option
break
if role_path:
_load_library_if_exists(os.path.join(role_path, "library"))
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return role_path
def _look_for_role_files(basedir, role, main="main"):
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role_path = _rolepath(basedir, role)
if not role_path:
return []
results = []
for th in ["tasks", "handlers", "meta"]:
for ext in (".yml", ".yaml"):
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thpath = os.path.join(role_path, th, main + ext)
if os.path.exists(thpath):
results.append({"path": thpath, "type": th})
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break
return results
def rolename(filepath):
idx = filepath.find("roles/")
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if idx < 0:
return ""
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role = filepath[idx + 6:]
role = role[:role.find("/")]
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return role
def _kv_to_dict(v):
(command, args, kwargs) = tokenize(v)
return (dict(__ansible_module__=command, __ansible_arguments__=args, **kwargs))
def normalize_task(task, filename, custom_modules=[]):
"""Ensure tasks have an action key and strings are converted to python objects."""
ansible_action_type = task.get("__ansible_action_type__", "task")
if "__ansible_action_type__" in task:
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del (task["__ansible_action_type__"])
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# temp. extract metadata
ansible_meta = dict()
for key in ["__line__", "__file__", "__ansible_action_meta__"]:
default = None
if key == "__ansible_action_meta__":
default = dict()
ansible_meta[key] = task.pop(key, default)
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normalized = dict()
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builtin = list(ansible.parsing.mod_args.BUILTIN_TASKS)
builtin = list(set(builtin + custom_modules))
ansible.parsing.mod_args.BUILTIN_TASKS = frozenset(builtin)
mod_arg_parser = ModuleArgsParser(task)
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try:
action, arguments, normalized["delegate_to"] = mod_arg_parser.parse()
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except AnsibleParserError as e:
raise LaterAnsibleError("syntax error", e)
# denormalize shell -> command conversion
if "_uses_shell" in arguments:
action = "shell"
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del (arguments["_uses_shell"])
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for (k, v) in list(task.items()):
if k in ("action", "local_action", "args", "delegate_to") or k == action:
# we don"t want to re-assign these values, which were
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# determined by the ModuleArgsParser() above
continue
else:
normalized[k] = v
normalized["action"] = dict(__ansible_module__=action)
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if "_raw_params" in arguments:
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normalized["action"]["__ansible_arguments__"] = arguments["_raw_params"].strip().split()
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del (arguments["_raw_params"])
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else:
normalized["action"]["__ansible_arguments__"] = list()
normalized["action"].update(arguments)
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normalized[FILENAME_KEY] = filename
normalized["__ansible_action_type__"] = ansible_action_type
# add back extracted metadata
for (k, v) in ansible_meta.items():
if v:
normalized[k] = v
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return normalized
def action_tasks(yaml, file):
tasks = list()
if file["filetype"] in ["tasks", "handlers"]:
tasks = add_action_type(yaml, file["filetype"])
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else:
tasks.extend(extract_from_list(yaml, ["tasks", "handlers", "pre_tasks", "post_tasks"]))
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# Add sub-elements of block/rescue/always to tasks list
tasks.extend(extract_from_list(tasks, ["block", "rescue", "always"]))
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# Remove block/rescue/always elements from tasks list
block_rescue_always = ("block", "rescue", "always")
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tasks[:] = [task for task in tasks if all(k not in task for k in block_rescue_always)]
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allowed = ["include", "include_tasks", "import_playbook", "import_tasks"]
return [task for task in tasks if set(allowed).isdisjoint(task.keys())]
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def task_to_str(task):
name = task.get("name")
if name:
return name
action = task.get("action")
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args = " ".join([
u"{0}={1}".format(k, v)
for (k, v) in action.items()
if k not in ["__ansible_module__", "__ansible_arguments__"]
] + action.get("__ansible_arguments__"))
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return u"{0} {1}".format(action["__ansible_module__"], args)
def extract_from_list(blocks, candidates):
results = list()
for block in blocks:
for candidate in candidates:
delete_meta_keys = [candidate, "__line__", "__file__", "__ansible_action_type__"]
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if isinstance(block, dict) and candidate in block:
if isinstance(block[candidate], list):
meta_data = dict(block)
for key in delete_meta_keys:
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meta_data.pop(key, None)
results.extend(add_action_type(block[candidate], candidate, meta_data))
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elif block[candidate] is not None:
raise RuntimeError(
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"Key '{candidate}' defined, but bad value: '{block}'".format(
candidate=candidate, block=str(block[candidate])
)
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)
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return results
def add_action_type(actions, action_type, action_meta=None):
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results = list()
for action in actions:
action["__ansible_action_type__"] = BLOCK_NAME_TO_ACTION_TYPE_MAP[action_type]
if action_meta:
action["__ansible_action_meta__"] = action_meta
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results.append(action)
return results
def parse_yaml_linenumbers(data, filename):
"""
Parse yaml as ansible.utils.parse_yaml but with linenumbers.
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The line numbers are stored in each node's LINE_NUMBER_KEY key.
"""
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def compose_node(parent, index):
# the line number where the previous token has ended (plus empty lines)
line = loader.line
node = Composer.compose_node(loader, parent, index)
node.__line__ = line + 1
return node
def construct_mapping(node, deep=False):
try:
mapping = AnsibleConstructor.construct_mapping(loader, node, deep=deep)
except yaml.constructor.ConstructorError as e:
raise LaterError("syntax error", e)
if hasattr(node, "__line__"):
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mapping[LINE_NUMBER_KEY] = node.__line__
else:
mapping[LINE_NUMBER_KEY] = mapping._line_number
mapping[FILENAME_KEY] = filename
return mapping
try:
kwargs = {}
loader = AnsibleLoader(data, **kwargs)
loader.compose_node = compose_node
loader.construct_mapping = construct_mapping
data = loader.get_single_data() or []
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except (yaml.parser.ParserError, yaml.scanner.ScannerError) as e:
raise LaterError("syntax error", e)
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except (yaml.composer.ComposerError) as e:
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e.problem = "{} {}".format(e.context, e.problem)
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raise LaterError("syntax error", e)
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return data
def normalized_yaml(file, options):
lines = []
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removes = []
try:
with codecs.open(file, mode="rb", encoding="utf-8") as f:
lines = list(enumerate(f.readlines(), start=1))
for i, line in lines:
if line.strip().startswith("#"):
removes.append((i, line))
# remove document starter also
if options.get("remove_markers") and line.strip() == "---":
removes.append((i, line))
# remove empty lines
if options.get("remove_empty") and not line.strip():
removes.append((i, line))
for line in removes:
lines.remove(line)
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except (yaml.parser.ParserError, yaml.scanner.ScannerError) as e:
raise LaterError("syntax error", e)
return lines
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class UnsafeTag:
"""Handle custom yaml unsafe tag."""
yaml_tag = u"!unsafe"
def __init__(self, value):
self.unsafe = value
@staticmethod
def yaml_constructor(loader, node):
return loader.construct_scalar(node)
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class VaultTag:
"""Handle custom yaml vault tag."""
yaml_tag = u"!vault"
def __init__(self, value):
self.unsafe = value
@staticmethod
def yaml_constructor(loader, node):
return loader.construct_scalar(node)